MAX77757HEFG430+ [MAXIM]
3.15A USB Type-C Autonomous Charger with JEITA for 1-Cell Li-ion/LiFePO4 Batteries;型号: | MAX77757HEFG430+ |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | 3.15A USB Type-C Autonomous Charger with JEITA for 1-Cell Li-ion/LiFePO4 Batteries |
文件: | 总35页 (文件大小:715K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Benefits and Features
General Description
•
•
•
•
Up to 16V Protection
The MAX77757 is a standalone 3.15A charger with
13.7V Maximum Input Operating Voltage
3.15A Maximum Charging Current
6A Discharge Current Protection
• No Firmware or Communication Required
• Integrated CC Detection for USB Type-C
• Integrated BC1.2 Detection for Legacy SDP,
DCP, CDP, and DCD Timeout
®
integrated USB Type-C CC detection with JEITA
compliance that supports reverse boost capability. The
fast-charge current is easily configured with resistors.
The MAX77757 operates with an input voltage of 4.5V
to 13.7V and has a maximum input current limit of 3A.
The IC also implements the adaptive input current limit
(AICL) function that regulates the input voltage by
reducing input current to prevent the voltage of a weak
adapter from collapsing or folding back.
• Integrated USB Detection for Common
Proprietary Charger Types
• Automatic Input Current Limit Configuration
• Input Voltage Regulation with Adaptive Input
Current Limit (AICL)
The USB Type-C Configuration Channel (CC) detection
pins on the MAX77757 enable automatic USB Type-C
power source detection and input current limit
configuration. To support a variety of legacy USB types
as well as proprietary adapters, the IC also integrates
BC1.2 detection using the D+ and D- pins. The IC runs
the CC pin and BC1.2 detection automatically as soon
as a USB plug is inserted without any software control.
•
•
Reverse Boost Capability up to 5.1V, 1.5A
Termination Voltage
• 4.1V to 4.5V for Li-ion and Li-poly Batteries
• 3.6V/3.7V for LiFePO4 Battery
•
Safety
• Charge Safety Timer
• JEITA Compliance with NTC Thermistor
(MAX77757J)
• HOT/COLD Stop Charging with NTC Thermistor
(MAX77757H)
The IC also offers reverse-boost capability up to 5.1V
and 1.5A, which can be enabled with the ENBST pin.
The STAT pin indicates charging status while the INOKB
pin indicates valid input voltage. Charging can be
stopped by pulling the THM pin low.
• Thermal Shutdown
The MAX77757 is equipped with a Smart Power
Selector™ and a battery true-disconnect FET to control
the charging and discharging of the battery or to isolate
the battery in case of a fault. The MAX77757 is offered
in several variants to support Li-ion batteries with various
termination voltages from 4.1V to 4.5V. It also has a 3.6V
termination voltage option for LiFePO4 batteries. The IC
comes in a 3mm x 3mm, 0.4mm pitch, 24-lead FC2QFN
package making it suitable for low-cost PCB assembly.
•
Pin Control of All Functions
• Resistor Configurable Fast-Charge Current
• ENBST Pin to Enable and Disable Reverse Boost
• STAT Pin to Indicate Charging Status
• INOKB Pin to Indicate Input Power-OK
• THM Pin to Disable Charge
•
•
•
Integrated Power Path
Integrated Battery True-Disconnect FET
3mm x 3mm, 24-Lead FC2QFN Package
Applications
Ordering Information appears at end of data sheet.
•
•
•
•
•
•
•
Mobile Point-of-Sale (mPOS) Terminals
Portable Medical Devices
Wireless Headphones
GPS Trackers
Charging Cradles for Wearable Devices
Power Banks
Mobile Routers
19-100986; Rev 1; 3/21
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Simplified Block Diagram
4.5V TO 13.7V/3A
BYP
CHGIN
10µF +
22µF
2.2µF
USB TYPE-C
CONNECTOR
DP
DN
BST
LX
0.1µF
CC2
CC1
MAX77757
0.47µH
2x10µF
V
SYS
SYS
PVL
SYS
2.2µF
INOKB
STAT
PGND
ENBST
IFAST
3.15A
BATT
THM
10µF
VPVL
2.2µF
V
DD
GND
T
THERMISTOR
www.maximintegrated.com
Maxim Integrated | 2
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Absolute Maximum Ratings
CHGIN to GND................................................-0.3V to +16.0V
BYP, LX to PGND ...........................................-0.3V to +16.0V
BATT, SYS, INOKB, STAT, ENBST to GND .....-0.3V to +6.0V
BST to PVL......................................................-0.3V to +16.0V
BST to LX..........................................................-0.3V to +2.2V
DN, DP to GND .................................................-0.3V to +6.0V
CC1, CC2 to GND.............................................-0.3V to +6.0V
V
, PVL, IFAST, THM to GND........................ -0.2V to +2.2V
DD
V
, BYP Continuous Current .............................3.2A
CHGIN
RMS
RMS
RMS
LX, PGND Continuous Current ..................................3.5A
SYS, BATT Continuous Current.................................4.5A
Operating Temperature Range ........................-40°C to +85°C
Storage Temperature Range ......................... -65°C to +150°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or
any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
24-Lead FC2QFN
Package Code
F243A3F+1
21-100385B
90-100128A
Outline Number
Land Pattern Number
Thermal Resistance, Four-Layer Board:
Junction-to-Ambient (θ
)
31°C/W
7.5°C/W
JA
Junction-to-Case Thermal Resistance (θ
)
JC
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-
tutorial.
Electrical Characteristics
(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed
A
by design and characterization.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GENERAL ELECTRICAL CHARACTERISTICS
Battery Only Quiescent
Current
SWITCHING MODE CHARGER
I
USBC as UFP and BATT = SYS = 3.6V
Operating voltage (Note 1)
30
50
µA
BATT_Q
V
V
CHGIN_
UVLO
CHGIN_
OVLO
CHGIN Voltage Range
V
V
V
CHGIN
CHGIN Overvoltage
Threshold
V
V
V
V
rising
falling
13.4
13.7
300
14
CHGIN_OVLO
CHGIN
CHGIN Overvoltage-
Threshold Hysteresis
CHGIN to GND
Minimum Turn-On
Threshold Accuracy
CHGIN to SYS
CHGINH_OVL
O
mV
CHGIN
V
V
rising
rising
4.6
4.7
4.8
V
V
CHGIN_UVLO
CHGIN
CHGIN
V
+
V
+
V
+
SYS
0.12
SYS
0.20
SYS
0.28
Minimum Turn-On
Threshold
V
CHGIN2SYS
V
www.maximintegrated.com
Maxim Integrated | 3
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed
A
by design and characterization.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CHGIN Adaptive
Voltage Regulation
Threshold Accuracy
CHGIN Current Limit
Range
V
4.4
4.5
4.6
V
CHGIN_REG
Automatically configured after charger
type detection
CHGIN_ILIM
0.5
3.0
4
A
V
V
= 5.0V, charger enabled, V
=
SYS
CHGIN
= 4.5V, (no switching, battery
BATT
CHGIN Supply Current
I
2.7
mA
IN
charged)
Charger enabled, 500mA input current
setting
Charger enabled, 1500mA input current
setting
Charger enabled, 3000mA input current
setting
423
1300
2600
460
1400
2800
500
1500
3000
V
Input Current
CHGIN
Limit
I
mA
ms
INLIMIT
Time required for the charger input to
cause CHGIN capacitor to decay from
6.0V to 4.3V
CHGIN Self-Discharge
Down to UVLO Time
t
100
INSD
CHGIN Input Self-
Discharge Resistance
CHGIN to BYP
Resistance
R
44
45
kΩ
INSD
R
Bidirectional
mΩ
CHGIN2BYP
LX High-Side
Resistance
R
60
60
20
mΩ
mΩ
mΩ
HS
LX Low-Side Resistance
R
LS
BATT to SYS Dropout
Resistance
R
BAT2SYS
Calculation estimates a 0.04Ω inductor
resistance (R )
L
CHGIN to BATT
Dropout Resistance
R
165
mΩ
CHGIN2BAT
R
= R
CHGIN2BYP
+ R + R
HS
CHGIN2BAT
+ R
L
BAT2SYS
LX = PGND or BYP, T = +25°C
0.01
1
10
10
A
LX Leakage Current
BST Leakage Current
µA
µA
LX = PGND or BYP, T = +85°C
A
BST = PGND or 1.8V, T = +25°C
0.01
1
A
BST = PGND or 1.8V, T = +85°C
A
V
= 5V, V
= 0V, LX = 0V,
BYP
CHGIN
0.01
1
10
10
charger disabled, T = +25°C
A
BYP Leakage Current
SYS Leakage Current
µA
µA
V
= 5V, V
= 0V, LX = 0V,
BYP
CHGIN
charger disabled, T = +85°C
A
V
= 0V, V
= 4.2V, charger
SYS
BATT
0.01
1
disabled, T = +25°C
A
V
= 0V, V
= 4.2V, charger
SYS
BATT
disabled, T = +85°C
A
Minimum ON Time
Minimum OFF Time
Buck Current Limit
t
75
75
ns
ns
A
ON-MIN
t
OFF-MIN
I
5.16
6.0
6.84
LIM
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Maxim Integrated | 4
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed
A
by design and characterization.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Reverse Boost
Non-switching; output forced 200mV
above its target regulation voltage
2000
µA
Quiescent Current
Reverse Boost BYP
Voltage in OTG Mode
CHGIN Output Current
Limit
V
4.94
5.1
5.26
V
BYP.OTG
I
CHGIN.OTG.LI
M
3.4V < V
BATT
< 4.5V
1500
1725
mA
Discontinuous inductor current (i.e., skip
mode)
±150
±150
-0.3
Reverse Boost Output
Voltage Ripple
mV
%
Continuous inductor current
T
= +25°C, BATT regulation voltage
A
-0.9
-1
+0.3
+0.5
3.15
(See the Ordering Information table)
= 0°C to +85°C, BATT regulation
BATT Regulation
Voltage Accuracy
T
A
voltage (See the Ordering Information
table)
-0.3
Fast-Charge Current
Program Range
External resistor programmable
0.5
A
V
V
> V
> V
> V
, programmed for 3.0A
, programmed for 2.0A
, programmed for 0.5A
2850
1900
465
3000
2000
500
3150
2100
535
BATT
SYSMIN
SYSMIN
SYSMIN
Fast-Charge Currents
I
mA
FC
BATT
V
V
BATT
rising for termination voltage from
BATT
Trickle Charge
Threshold
V
V
4.1V to 4.5V; trickle charge is disabled for
3.6V option
3.0
2.4
3.1
3.2
2.6
V
TRICKLE
Precharge Threshold
V
rising
2.5
V
PRECHG
BATT
Prequalification
Threshold Hysteresis
V
Applies to both V
and V
PRECHG
100
mV
PQ-H
TRICKLE
I
for termination voltage from
TRICKLE
Trickle Charge Current
I
I
4.1V to 4.5V option; trickle charge is
disabled for 3.6V option
270
300
330
mA
TRICKLE
PRECHG
Precharge Charge
Current
Charger Restart
Threshold
Charger Restart
Deglitch Time
Top-Off Current
Program Range
40
50
55
80
mA
mV
ms
mA
V
RSTRT
100
130
150
10mV overdrive, 100ns rise time
I
I
See Table 3
50
150
TO
TO
Programmed for 150mA
Programmed for 50mA
130
25
150
50
170
75
Top-Off Current
Accuracy
mA
ms
Charge Termination
Deglitch Time
t
2mV overdrive, 100ns rise/fall time
30
TERM
Charger Soft-Start Time
t
1.5
70
ms
SS
I
= 10mA
mV
BATT
BATT to SYS Reverse
Regulation Voltage
V
BSREG
Load regulation during the reverse
regulation mode
1
mV/A
V
For termination voltage from 4.1V to 4.5V
For 3.6V termination voltage
3.5
3.0
Minimum SYS Voltage
V
SYSMIN
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Maxim Integrated | 5
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed
A
by design and characterization.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum SYS Voltage
Accuracy
V
-3
+3
%
SYSMIN
Applies to both low-battery precharge and
trickle modes
Prequalification Time
t
30
min
h
PQ
Fast-Charge Constant
Current Plus Fast-
Charge Constant
Voltage Time
t
6
FC
Top-Off Time
t
30
s
TO
Timer Accuracy
-20
+20
%
Junction Temperature
Thermal Regulation
Loop Setpoint Program
Range
Junction temperature when charge
current is reduced
T
130
°C
REG
Thermal Regulation
Gain
-157.5
74
mA/°C
%
AT
JREG
I
= 3.15A
FC
VTHM/VPVL rising, 1% hysteresis
(thermistor temperature falling)
THM Threshold, COLD
THM Threshold, COOL
THM Threshold, WARM
THM Threshold, HOT
THM_COLD
THM_COOL
THM_WARM
THM_HOT
72.5
63.5
31
75.5
66.5
34
VTHM/VPVL rising, 1% hysteresis
(thermistor temperature falling)
65
32.5
23
%
%
%
%
VTHM/VPVL falling, 1% hysteresis
(thermistor temperature rising)
VTHM/VPVL falling, 1% hysteresis
(thermistor temperature rising)
21.5
4.5
24.5
VTHM/VPVL falling, 1% hysteresis
Charger Disable
Threshold
V
CHGR_EN
6
7.5
1
(charger is disabled below this threshold)
VTHM = GND or VPVL; TA = +25°C
VTHM = GND or VPVL; TA = +85°C
0.1
0.1
μA
μA
THM Input Leakage
Current
Battery Overcurrent
Threshold
Battery Overcurrent
Debounce Time
Battery Overcurrent
Retry
6.0
A
ms
s
I
t
BOVCR
BOVRC
6
0.15
t
OCP_RETRY
Battery Overcurrent
Protection Quiescent
Current
3 + IBATT
/18040
µA
I
BOVRC
System Power-Up
Current
System Power-Up
Voltage
35
50
80
mA
V
I
SYSPU
V
rising, 100mV hysteresis
SYS
1.9
2.0
2.1
V
SYSPU
INOKB, STAT
Logic Input Leakage
Current
0.1
1
µA
www.maximintegrated.com
Maxim Integrated | 6
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed
A
by design and characterization.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Output Low Voltage
INOKB, STAT
I
= 5mA
source
0.4
V
V
V
= 5.5V, T = +25°C
A
SYS
SYS
-1
0
+1
Output High Leakage
INOKB, STAT
µA
= 5.5V, T = +85°C
A
0.1
ENBST
ENBST Logic Input Low
Threshold
V
IL
0.4
V
V
ENBST Logic Input High
Threshold
V
IH
1.4
ENBST Logic Input
Leakage Current
ENBST = 5.5V (including current through
pulldown resistor)
I
ENBST
24
60
µA
kΩ
ENBST Pulldown
Resistor
R
ENBST
235
CHARGER DETECTION
t
BC1.2 State Timeout
TMO
180
700
200
800
220
900
ms
ms
Data Contact Detect
Time-Out
t
DCDtmo
Proprietary Charger
Debounce
t
PRDeb
5
7.5
35
50
10
39
55
ms
ms
ms
Primary to Secondary
Timer
t
PDSDWait
27
45
Charger Detection
Debounce
t
CDDeb
DP and DN pins; threshold in percent of
VBUS voltage
3V < VBUS < 5.5V
V
VBUS64 Threshold
VBUS64 Hysteresis
VBUS47 Threshold
VBUS47 Hysteresis
VBUS31 Threshold
BUS64
57
43.3
26
64
0.015
47
71
51.7
36
%
V
V
BUS64_H
DP and DN pins; threshold in percent of
VBUS voltage
3V < VBUS < 5.5V
V
BUS47
%
V
0.015
31
DP and DN pins; threshold in percent of
VBUS voltage
3V < VBUS < 5.5V
V
BUS31
WEAK
%
VBUS31 Hysteresis
IWEAK Current
0.015
0.1
20
V
I
0.01
14.25
7
0.5
24.8
13
µA
kΩ
µA
R
RDM_DWN Resistor
IDP_SRC Current
DM_DWN
I
/I
DP_SRC DCD Accurate over 0V to 2.5V
10
I
/
DM_SINK
IDM_SINK Current
Accurate over 0.15V to 3.6V
45
80
125
µA
I
DATSINK
www.maximintegrated.com
Maxim Integrated | 7
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed
A
by design and characterization.)
PARAMETER
VLGC Threshold
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
LGC
1.62
1.7
1.9
V
V
VLGC Hysteresis
LGC_H
0.015
0.32
V
V
V
V
VDAT_REF Threshold
VDAT_REF Hysteresis
DAT_REF
0.25
0.5
0.4
0.7
V
DAT_REF_H
0.015
V
/
DN_SRC
Accurate over I
Accurate over I
= 0 to 200µA
VDN_SRC Voltage
VDP_SRC Voltage
LOAD
LOAD
0.6
V
V
SRC06
V
/
DP_SRC
= 0 to 200µA
0.5
3
0.6
6.1
0.7
12
V
V
SRC06
R
COMP2 Load Resistor
USB
Load resistor on DP/DN
MΩ
CC DETECTION
Measured at CC pins with 126kΩ load;
IDFP1.5_CC enable and VAVL ≥ 2.5V
CC Pin Voltage in DFP
1.5A Mode
V
CC_PIN
1.85
V
V
V
V
60µA ≤ I ≤ 600µA
CC_
CC Pin Clamp Voltage
CC_ClAMP
1.1
1.32
5.5
CC Pin Clamp Voltage
(5.5V)
I
< 2mA
CC_
5.25
CC UFP Pulldown
Resistance
R
PD_UFP
-10%
5.1K
+10%
Ω
CC DFP 1.5A Current
Source
I
DFP1.5_CC
-8%
0.15
0.61
180
0.2
+8%
0.25
0.7
µA
V
V
CC RA RD Threshold
RA_RD0.5
CC UFP 0.5A RD
Threshold
V
UFP_RD0.5
0.66
V
CC UFP 0.5A RD
Hysteresis
V
UFP_RD0.5_H
0.015
1.23
0.15
V
V
CC UFP 1.5A RD
Threshold
V
UFP_RD1.5
1.16
1.31
15
CC UFP 1.5A RD
Hysteresis
V
UFP_RD1.5_H
V
Max time allowed from removal of voltage
t
CC Pin Power-Up Time
ClampSwap
ms
clamp till 5.1kΩ resistor attached
t
t
CC Detection Debounce
Type-C Debounce
CCDeb
100
10
119
15
1
200
20
ms
ms
ms
PDDeb
t
Type-C Quick Debounce
QDeb
0.9
1.1
The CHGIN input must be less than V
to turn on.
and greater than both V
and V for the charger
CHGIN2SYS
Note 1:
CHGIN_OVLO
CHGIN_UVLO
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Maxim Integrated | 8
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Pin Configuration
TOP VIEW
23
21
24
22
20
19
1
2
18
17
16
BST
PGND
PVL
INOKB
STAT
CC2
SYS
3
4
MAX77757
SYS
15
14
13
BATT
5
6
CC1
DP
BATT
7
8
9
10
11
12
(3mm x 3mm, 0.4mm PITCH)
Pin Descriptions
PIN
NAME
FUNCTION
Provides Drive To High-Side Internal nMOS. Connect a 0.1μF/6.3V bootstrap capacitor between this pin
and the LX node.
1
BST
Charger Input Valid, Active-Low Logic Output Flag. Open-drain output indicates when valid voltage is
present at CHGIN.
Open-Drain Charge Status Indication Output. STAT is toggling low and high impedance during charge.
STAT becomes low when top-off threshold is detected and in done state. STAT becomes high
impedance when charge faults happen.
2
3
INOKB
STAT
4
5
6
7
8
9
CC2
CC1
DP
USB Type-C CC2 Connection
USB Type-C CC1 Connection
Common Positive Output 1. Connect to D+ on USB Type-C or micro-USB connector.
Common Negative Output 1. Connect to D- on USB Type-C or micro-USB connector.
Active-High Logic Input. Enable/disable the reverse boost converter.
DN
ENBST
GND
Analog Ground. Short to ground plane.
Output of On-Chip LDO Used to Power On-Chip, Low-Noise Circuits. Bypass with a 2.2µF/10V ceramic
10
V
DD
capacitor to GND. Powering external loads from V
is not recommended other than pullup resistors.
DD
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Maxim Integrated | 9
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Thermistor Connection. Connect an external negative temperature coefficient (NTC) thermistor from
THM to GND. Connect a resistor equal to the thermistor +25°C resistance from THM to PVL.
11
12
THM
Fast-Charge Current Setting Pin. Connect a resistor (RIFAST) from IFAST to GND to program the fast
charge current. Use 24.9kΩ for 3.15A fast charge current. See the Application Information section.
Battery Power Connection. Connect to the positive terminal of a single-cell (or parallel cell) Li-ion battery.
Bypass BATT to PGND ground plane with a 10µF ceramic capacitor.
IFAST
13, 14
15, 16
17
BATT
SYS
System Power Node. Bypass SYS to PGND with a 2x10µF/10V ceramic capacitor.
Output of On-Chip LDO, Noisy Rail due to Bootstrap Operation. Bypass with a 2.2µF/10V ceramic
capacitor to PGND. Powering external loads from PVL is not recommended.
PVL
18, 19
PGND
Power Ground. Connect the return of the buck output capacitor close to these pins.
Switching Node. Connect an inductor between LX and SYS. When the buck converter is enabled, LX
switches between BYP and PGND to control the input current, battery current, battery voltage, and die
temperature.
20, 21
LX
System Power Connection. Output of OVP adapter input block and input to switching charger. Bypass
with a 22µF/16V ceramic capacitor from BYP to PGND.
22
BYP
Charger Input. Up to 13.7V operating, 16VDC withstand input pin connected to an adapter or USB power
source. Connect a 2.2µF/16V ceramic capacitor from CHGIN to GND.
23, 24
CHGIN
Functional Diagram
SYS
1kΩ
INOKB
CHGIN
BYP
BST
10µF+
22µF
CHARGER INPUT
SENSE AND CONTROL
2
MAX77757
VBUS
2.2µF
PVL
VDD
0.1µF
BIAS AND REF
2.2µF
2.2µF
LX
2
2
DN
DP
CC2
CC1
SYS
BC1.2,
USB TYPE-C CC
DETECTION
CHARGER SW
CONTROL,
REVERSE BOOST
PGND
SYS
2x10µF
2
PVL
THM
SYS
BATT
2
ENBST
1kΩ
SWITCH
STAT
IFAST
+
10µF
T
THERMISTOR
24.9kΩ
GND
BATTERY
PACK
Detailed Description
The MAX77757 is a highly integrated USB Type-C Charger with autonomous configuration. The MAX77757 can operate
from an input range of 4.5V to 13.7V to support 5V, 9V, and 12V AC adapters as well as USB input. The fast-charge
current is up to 3.15A and the max input current limit is 3.0A.
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Maxim Integrated | 10
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
The MAX77757 can run BC1.2 and USB Type-C CC detection upon input insertion and configure input source to max
power option and charger input current limit to max power.
Fast-charge current and top-off current threshold can be programmed with an external resistor. The input voltage
regulation feature (AICL) even allows users to use weak AC adapters without preventing a charge.
The power path design provides system power even when the battery is fully discharged, and it supplements current from
the battery and charge input automatically when the system demands a higher current.
A reverse boost from the battery can be enabled by the ENBST pin to allow 5.1V/1.5A OTG to V
.
BUS
Switching Mode Charger
Features
•
Complete Li+/LiPoly/LiFePO4 Battery Charger
• Prequalification, Constant Current, Constant Voltage
• 55mA Precharge Current
• 300mA Trickle Charge Current for Charge Termination Voltage from 4.1V to 4.5V. For the 3.6V/3.7V Termination
Voltage Options, Trickle Charge Current is Disabled
• Resistor Adjustable Constant Current Charge
o 500mA to 3.15A
• Resistor Adjustable Charge Termination Threshold
o 50mA to 150mA
• Battery Regulation Voltage
o 3.60V, 4.20V, 4.35V, and 4.40V
o -0.9/+0.3% Accuracy at +25°C
o -1/+0.5% Accuracy from 0°C to +85°C
•
•
Synchronous Switch-Mode Based Design
Smart Power Selector
• Optimally Distributes Power Between the Charge Adapter, System, and Main Battery
• When Powered by a Charge Adapter, the Main Battery can Provide Supplemental Current to the System
• The Charge Adapter can Support the System without the Main Battery
•
•
No External MOSFETs Required
Single Input Operation
• Reverse Leakage Protection (Prevents the Battery from Leaking Current to the Inputs)
• V
= 13.7V
CHGIN_OVLO
• Supports AC-to-DC Wall Adapters
• Automatic Input Current Limit Selection After Charger Type Detection
o 500mA, 1A, 2A, 2.5A, and 3A
•
•
Charge Safety Timer
• 6 Hours
Die Temperature Monitor with Thermal Foldback Loop
• Die Temperature Thresholds: 130°C
•
•
Input Voltage Regulation Allows Operation from High-Impedance Sources (AICL)
BATT to SYS Switch is 20mΩ Typical
• Capable of 4.5A Steady-State Operation from BATT to SYS
•
Short Circuit Protection
• BATT to SYS Overcurrent Threshold: 6A
• SYS Short-to-Ground
o Buck Operates with Input Current Limit to 200mA when VSYS < VSYSPU
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Maxim Integrated | 11
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
V
/V
CHGIN
USB ADP
Q
CHGIN
BYP
BST
CHGIN
BYP
5.1V
UP TO +13.7V OPERATING
UP TO 3.0A INPUT CURRENT
(REVERSE BOOST MODE)
Q
HS
CHGIN INPUT CURRENT
LIMIT SWITCH
LX
BUCK/BOOST
CONTROLLER
SYS
Q
LS
PGND
SYS
Q
BAT
CHARGE AND
SMART POWER
MAX77757
PATH CONTROLLER
UP TO 3.15A
CHARGE CURRENT
BATT
+
Figure 1. Simplified Functional Diagram
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Maxim Integrated | 12
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
MAX77757
R
INSD
Q
CHGIN
V
BYP
CHGIN
BYP
BYP
V
/V
USB ADP
22µF
16V
0603
10µF
16V
0603
2.2µF
16V
0603
UP TO +13.7V OPERATING
UP TO 3.0A INPUT CURRENT
V
CHGIN
INPUT CONTROL
WATCHDOG
CHARGE
TIMER
BST
HS
0.1µF
6.3V
1.3MHz
0402
Q
BUCK CONTROLLER
0.47µH
LX
DRV_OUT
CHARGE CONTROLLER
Q
LS
REVERSE BOOST
CONTROLLER
PGND
JUNCTION
TEMPERATURE
SENSOR TEMP
SYS
SYS
T
J
V
SYS
2x10µF
10V
0603
Q
BAT
V
IBATT
BATT
BATT
10µF
10V
0603
UP TO 3.15A OF
CHARGE
CURRENT AND
UP TO 6A OF
DISCHARGE
CURRENT
BATT
GND
+
V
MBATT
Figure 2. Main Battery Charger Detailed Functional Diagram
Detailed Description
The MAX77757 is a switch-mode charger for a one-cell lithium-ion (Li+), lithium polymer (Li-polymer), or LiFePO4 battery.
The current limit for CHGIN input is configured automatically allowing the flexibility to connect to either an AC-to-DC wall
charger or a USB port, as shown in Figure 2.
The synchronous switch-mode DC-DC converter utilizes a high 1.3MHz switching frequency, which is ideal for portable
devices since it allows the use of small components while eliminating excessive heat generation. The DC-DC converter
has both a buck and a boost mode of operation. When charging, the main battery converter operates in buck mode. The
DC-DC buck operates from a 4.3V to 13.7V source and delivers up to 3.15A to the battery. The battery charge current is
programmable from 500mA to 3.15A with an external resistor.
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Maxim Integrated | 13
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
As a boost converter, the DC-DC uses energy from the main battery to boost the voltage at BYP. The boosted BYP
voltage is used to supply the USB OTG voltage which is fixed to 5.1V.
Maxim Integrated’s Smart Power Selector architecture makes the best use of the limited adapter power and the battery’s
power at all times to supply up to buck current limit from the buck to the system. (Additionally, supplement mode provides
additional current from the battery to the system up to B2SOVRC.) Adapter power that is not used for the system is used
to charge the battery. All power switches for charging and switching the system load between the battery and adapter
power are included on-chip—no external MOSFETs are required.
Maxim Integrated’s proprietary process technology allows for low-RDSON devices in a small solution size. The total
dropout resistance from the adapter power input to the battery is 165mΩ (typ), assuming that the inductor has 0.04Ω of
ESR. This 165mΩ typical dropout resistance allows for charging a battery up to 3.0A from a 5V supply. The resistance
from the BATT-to-SYS node is 20mΩ, allowing for low power dissipation and long battery life.
A multitude of safety features ensures reliable charging. Features include a charge timer, junction thermal regulation,
over/undervoltage protection, and short circuit protection.
The BATT-to-SYS switch has overcurrent protection (see the Main Battery Overcurrent Protection During System Power-
Up section for more information).
Smart Power Selector (SPS)
The SPS architecture is a network of internal switches and control loops that distribute energy between external power
sources CHGIN, BYP, SYS, and BATT.
Figure 1 shows a simplified arrangement for the smart power selector’s power steering switches. Figure 2 shows a more
detailed arrangement of the smart power selector switches with the following names: Q
, Q , Q , and Q .
CHGIN HS LS BAT
Switch and Control Loop Descriptions
•
•
•
CHGIN Input Switch: Q
provides the input overvoltage protection of +16V. The input switch is either completely
CHGIN
on or completely off. As shown in Figure 2, there are SPS control loops that monitor the current through the input
switches as well as the input voltage.
DC-DC Switches: Q and Q are the DC-DC switches that can operate as a buck (step-down) or a boost (step-up).
HS LS
When operating as a buck, energy is moved from BYP to SYS. When operating as a boost, energy is moved from
SYS to BYP. SPS control loops monitor the DC-DC switch current, the SYS voltage, and the BYP voltage.
Battery-to-System Switch: Q
BAT
to be isolated from the system (SYS). An SPS control loop monitors the Q
controls the battery charging and discharging. Additionally, Q
allows the battery
BAT
current.
BAT
SYS Regulation Voltage
•
When DC-DC is enabled as a buck and the charger is enabled but in a non-charging state such as done, thermal
shutdown, or timer fault, V is regulated to V and Q is off.
SYS
BATTREG
BAT
•
When the DC-DC is enabled as a buck and charging in trickle-charge, fast-charge, or top-off modes, V
is regulated
SYS
to V
when the V
< V
< V
. And, when the DC-DC is enabled as a buck and charging in
SYSMIN
precharge mode (V
PRECHG
< V
BATT
), V
SYSMIN
is regulated to V
. In these modes, the Q
BATTREG
switch acts as a
= V
SYS BATT +
BATT
PRECHG
SYS
BAT
, then V
linear regulator and dissipates power (P = (V
- V
) × I
). When V
> V
SYS
BATT
BATT
BATT
SYSMIN
I
× R . In this mode, the Q
BAT2SYS BAT
switch is closed.
BATT
In all of the previous modes, if the combined SYS load exceeds the input current limit, then V
drops to V
–
BATT
SYS
V
, and the battery provides supplemental current.
BSREG
Input Validation
The charger input is compared with several voltage thresholds to determine if it is valid. A charger input must meet the
following three characteristics to be valid:
•
CHGIN must be above V
to be valid. Once CHGIN is above the UVLO threshold, the information (together
CHGIN_UVLO
with LIN2SYS, described as follows) is latched and only can be reset when the charger is in adaptive input current
loop (AICL) and input current is lower than the IULO threshold of 60mA. Note that V
is lower than their
CHGIN_REG
UVLO falling threshold, respectively.
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Maxim Integrated | 14
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
•
•
CHGIN must be below its overvoltage lockout threshold (V
).
CHGIN_OVLO
.
CHGIN must be above the system voltage by V
CHGIN2SYS
VCHGI N
INPUT I S NOT
OVERVO LTAGE
VCHGI N_OVL OB
USB_CHGR_EN
VCHGI N_VLD
S
R
Q
INPUT I S NOT
UNDER VO LTAGE
VCHGI N_UVLO B
LIN2SYS
AICL
VCHGI NUVLO
LO W IN PU T TO SYS
HEADRO OM
VSYS + OFFSET
ADAPTIVE INPUT
CURR ENT LOO P
VCHGI N_REG
I_IULO
INPUT CU RRENT
LO W
IULO
ICHGI N2BYP
Figure 3. CHGIN Valid Signal Generation Logic
INOKB pin is pulled down when CHGINOK = 1 and the switcher starts.
V
CHGIN_VLD
INOKB
SWITCHER START
Figure 4. INOKB Signal Generation Logic
Input Current Limit
After the charger type detection is complete, the MAX77757 automatically configures the input current limit to the highest
setting that the source can provide. If the input source is not a standard power source described by BC1.2, USB Type-C,
or a proprietary charger type that the MAX77757 can detect, the MAX77757 sets the input current limit to 3A.
Input Voltage Regulation Loop
An input voltage regulation loop allows the charger to function well when it is attached to a poor-quality charge source.
The loop improves performance with relatively high resistance charge sources that exist when long cables are used or
devices are charged with non-compliant USB hub configurations.
The input voltage regulation loop automatically reduces the input current limit in order to keep the input voltage at
V
V
. If the input current limit is reduced to I
, then the charger input is turned off.
(50mA, typ) and the input voltage is below
CHGIN_REG
CHGIN_REG
CHGIN_REG_OFF
Input Self-Discharge
To ensure that a rapid removal and reinsertion of a charge source always results in a charger input interrupt, the charger
input presents loading to the input capacitor to ensure that when the charge source is removed the input voltage decays
below the UVLO threshold in a reasonable time (t
). The input self-discharge is implemented with a 44kΩ resistor
INSD
(R ) from CHGIN input to ground.
INSD
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Maxim Integrated | 15
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Charger States
Li+/Li-Poly Battery
The MAX77757 utilizes several charging states to safely and quickly charge Li+/Li-Poly batteries as shown in Figure 5
and Figure 6. Figure 5 shows an exaggerated view of the Li+/Li-Poly battery progressing through the following charge
states when there is no system load and the die and battery are close to room temperature: precharge ➔ trickle ➔ fast-
charge ➔ top-off ➔ done.
NOT TO SCALE, VCHGIN = 5.0V, ISYS = 0A, TJ = +25°C
VBATTREG
VRSTRT
VTRICKLE
VPRECHG
0V
TIME
ICHG ≤ ISET
ITRICKLE
ITO
0A
IPRECHG
TIME
CHARGER
ENABLED
Figure 5. Li+/Li-Poly Charge Profile
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Maxim Integrated | 16
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
INIT
INPUT IS VALID
INKOB = Hi-Z OR STAT = Hi-Z
ICHG = 0
CHG TIMER = 0
INPUT IS INVALID
BUCK
INKOB = LOW OR STAT = Hi-Z
SWITCHER = BUCK MODE
QBAT = OFF UNLESS SUPPLEMENT
VTHM > VCHGR_EN THRESHOLD
AND TJ < TSHDN
VPRECHG ≤ VBATT
and PQEN = 0
(SOFT-START)
PRECHARGE
INOKB = LOW AND
STAT = BLINK
CHG TIMER ≥ tPQ
CHG TIMER SUSPEND
ICHG ≤ IPRRECHG
VPRECHG ≤ VBATT
(SOFT-START)
VBATT < VPRECHG
(SOFT-START)
CHG TIMER ≥ tPQ
CHG TIMER SUSPEND
TRICKLE CHARGE
INOKB = LOW AND
STAT = BLINK
ICHG ≤ ITRICKLE
TIMER FAULT
INOKB = LOW AND STAT = Hi-Z
VBATT < VTRICKLE
AND
VPRECHG ≤ VBATT
ICHG = 0
VTRICKLE ≤ VBATT
(SOFT-START)
VBATT < VRECHG
(SOFT-START)
CHG TIMER ≥ tFC
CHG TIMER SUSPEND
VTHM < VCHGR_EN THRESHOLD
OR TJ > TSHDN
CHG TIMER SUSPEND
INPUT IS INVALID
CHG TIMER SUSPEND
FAST CHARGE (CC)
INOKB = LOW AND
STAT = BLINK
ICHG ≤ IFC
VBATTREG ≤ VBATT
I
< ICHG
FC
CHG TIMER ≥ tFC
CHG TIMER SUSPEND
FAST CHARGE (CV)
INOKB = LOW AND
STAT = BLINK
ANY STATE*
ITO < ICHG ≤ IFC
* EXCEPT INIT AND BUCK STATES
ICHG ≤ ITO FOR tTERM
TOP OFF
INOKB = LOW AND
STAT = LOW
ICHG ≤ ITO
VBATT < (VBATTREG – VRSTRT
(NO SOFT-START)
)
CHG TIMER ≥ tTO
CHG TIMER SUSPEND
CHARGER STATE WHERE THE CHARGE IS DISABLED
(BATTERY CHARGE STOPPED)
CHARGER STATE WHERE THE CHARGE IS ENABLED
(BATTERY CHARGE ON-GOING)
DONE
INOKB = LOW AND
STAT = LOW
ICHG = 0
VBATT < VPQLB
CONDITION NEEDED TO TRANSITION BETWEEN TWO CHARGER STATES
CHG TIMER = 0
CHG TIMER
VBATT < (VBATTREG – VRSTRT
)
CHG TIMER RESUME
TRANSITION BETWEEN TWO CHARGER STATES
Figure 6. Li+/Li-Poly Charger State Diagram
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Maxim Integrated | 17
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
LiFePO4 Battery
As for the LiFePO4 battery, the MAX77757 skips the trickle charge state and directly enters the fast-charge state after the
precharge state. Figure 7 and Figure 8 presents the LiFePO4 battery charge profile and state machine: precharge ➔
trickle ➔ fast-charge ➔ top-off ➔ done.
NOT TO SCALE, VCHGIN = 5.0V, VBATTREG=3.6V, ISYS = 0A, TJ = +25°C
VBATTREG
VRSTRT
VPRECHG
0V
TIME
ICHG ≤ ISET
ITO
IPRECHG
0A
TIME
CHARGER
ENABLED
Figure 7. LiFePO4 Battery Charge Profile
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Maxim Integrated | 18
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
INIT
INPUT IS VALID
INKOB = Hi-Z OR STAT = Hi-Z
ICHG = 0
CHG TIMER = 0
INPUT IS INVALID
BUCK
INKOB = LOW OR STAT = Hi-Z
SWITCHER = BUCK MODE
QBAT = OFF UNLESS SUPPLEMENT
VTHM > VCHGR_EN THRESHOLD
AND TJ < TSHDN
VPRECHG ≤ VBATT
and PQEN = 0
(SOFT-START)
PRECHARGE
INOKB = LOW AND
STAT = BLINK
CHG TIMER ≥ tPQ
CHG TIMER SUSPEND
ICHG ≤ IPRRECHG
VPRECHG ≤ VBATT
(SOFT-START)
VBATT < VPRECHG
(SOFT-START)
TIMER FAULT
INOKB = LOW AND STAT = Hi-Z
ICHG = 0
VBATT < VRECHG
(SOFT-START)
CHG TIMER ≥ tFC
CHG TIMER SUSPEND
VTHM < VCHGR_EN THRESHOLD
OR TJ > TSHDN
CHG TIMER SUSPEND
INPUT IS INVALID
CHG TIMER SUSPEND
FAST CHARGE (CC)
INOKB = LOW AND
STAT = BLINK
ICHG ≤ IFC
VBATTREG ≤ VBATT
I
< ICHG
FC
CHG TIMER ≥ tFC
CHG TIMER SUSPEND
FAST CHARGE (CV)
INOKB = LOW AND
STAT = BLINK
ANY STATE*
ITO < ICHG ≤ IFC
* EXCEPT INIT AND BUCK STATES
ICHG ≤ ITO FOR tTERM
TOP OFF
INOKB = LOW AND
STAT = LOW
ICHG ≤ ITO
VBATT < (VBATTREG – VRSTRT
(NO SOFT-START)
)
CHG TIMER ≥ tTO
CHG TIMER SUSPEND
CHARGER STATE WHERE THE CHARGE IS DISABLED
(BATTERY CHARGE STOPPED)
CHARGER STATE WHERE THE CHARGE IS ENABLED
(BATTERY CHARGE ON-GOING)
DONE
INOKB = LOW AND
STAT = LOW
ICHG = 0
VBATT < VPQLB
CONDITION NEEDED TO TRANSITION BETWEEN TWO CHARGER STATES
CHG TIMER = 0
CHG TIMER
VBATT < (VBATTREG – VRSTRT
)
CHG TIMER RESUME
TRANSITION BETWEEN TWO CHARGER STATES
Figure 8. LiFePO4 State Machine
INIT State
From any state shown in Figure 6 except thermal shutdown, the “INIT” state is entered whenever the charger inputs
CHGIN is invalid or the charger timer is suspended.
While in the “INIT” state, the charger current is 0mA, the charge timer is forced to 0, and the power to the system is
provided by the battery.
To exit the “INIT” state, the charger input must be valid.
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Maxim Integrated | 19
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Buck State
In the buck state, battery charging is disabled while the charger input CHGIN is valid. Entering or leaving the buck state
is controlled by the voltage of the THM pin. If the voltage of this pin is pulled down by an external device (e.g., MCU)
under V
, the chip goes to the buck state from any state if CHGIN is valid as shown in Figure 6. Charging is
CHGR_EN
disabled in the buck state, which means Q
is off unless it is in supplement mode. If the voltage of this pin is over
BAT
, the chip leaves the buck state and resumes charging. It should be noted that it is only when CHGIN is valid
V
CHGR_EN
that charging can be enabled or disabled. Therefore, the external device (e.g., MCU) should check the INOKB signal if
CHGIN is valid before trying to enable or disable charging.
Precharge State
As shown in Figure 6, the precharge state occurs when the main battery voltage is less than V
. In the precharge
PRECHG
state, charge current into the battery is I
.
PRECHG
The following events cause the state machine to exit this state:
•
•
The main battery voltage rises above V
charge.
If the battery charger remains in this state for longer than t , the charger state machine transitions to the timer fault
and the charger enters the next state in the charging cycle, trickle
PRECHG
PQ
state.
Note that the precharge state works with battery voltages down to 0V. The low 0V operation typically allows this battery
charger to recover batteries that have an “open” internal pack protector. Typically a pack internal protection circuit opens
if the battery has seen an overcurrent, undervoltage, or overvoltage. When a battery with an “open” internal pack protector
is used with this charger, the precharge mode current flows into the 0V battery—this current raises the pack’s terminal
voltage to the point where the internal pack protection switch closes.
Note that a normal battery typically stays in the precharge state for several minutes or less; therefore, a battery that stays
in the precharge state for longer than t
might be experiencing a problem.
PQ
Trickle Charge State
The trickle charge mode descripted below is for Li-ion and Li-poly batteries only, with charge termination voltage from
4.1V to 4.5V.
The trickle charge state occurs when V
> V
and V < V
BATT
, as shown in Figure 6.
TRICKLE
BATT
PRECHG
When the MAX77757 is in its trickle charge state, the charge current in the battery is less than or equal to I
.
TRICKLE
Charge current might be less than I
/I for any of the following reasons:
TRICKLE FC
•
•
•
•
The charger input is under input current limit
The charger input voltage is low
The charger is in thermal foldback
The system load is consuming adapter current. Note that the system load always gets priority over the battery charge
current.
The following events cause the state machine to exit this state:
•
When the main battery voltage rises above V
charge constant current (CC).
, the charger enters the next state in the charging cycle, fast-
TRICKLE
•
If the battery charger remains in this state for longer than t , the charger state machine transitions to the timer fault
PQ
state.
Note that a normal battery typically stays in the trickle charge state for several minutes or less; therefore, a battery that
stays in trickle charge for longer than t might be experiencing a problem.
PQ
Based on the characteristic of the LiFePO4 battery, the trickle charge state of the MAX77757 3.6V option is disabled.
After the precharge state, when V < V < V , the MAX77757 enters the fast-charge constant current
PRECHG
BATT
BATTREG
state to improve the charger efficiency.
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Maxim Integrated | 20
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Fast-Charge Constant Current State
As shown in Figure 6, the fast-charge constant current (CC) state occurs when the main-battery voltage is greater than
the trickle threshold and less than the battery regulation threshold (V < V < V ).
TRICKLE
BATT
BATTREG
In the fast-charge CC state, the current into the battery is less than or equal to I . Charge current can be less than I
FC
FC
for any of the following reasons:
•
•
•
•
The charger input is under input current limit
The charger input voltage is low
The charger is in thermal foldback
The system load is consuming adapter current. Note that the system load always gets priority over the battery charge
current.
The following events cause the state machine to exit this state:
•
When the main battery voltage rises above V
charge constant voltage (CV).
, the charger enters the next state in the charging cycle, fast-
BATTREG
•
If the battery charger remains in this state for longer than t , the charger state machine transitions to the timer fault
FC
state.
The battery charger dissipates the most power in the fast-charge constant current state. This power dissipation causes
the internal die temperature to rise. If the die temperature exceeds T
, I is reduced. See the Thermal Foldback
REG FC
section for more information.
Fast-Charge Constant Voltage State
As shown in Figure 6, the fast-charge constant voltage (CV) state occurs when the battery voltage rises to V
BATTREG
from the fast-charge CC state.
In the fast-charge CV state, the battery charger maintains V
across the battery and the charge current is less
BATTREG
than or equal to I . As shown in Figure 5, charger current decreases exponentially in this state as the battery becomes
FC
fully charged.
The smart power selector control circuitry might reduce the charge current lower than the battery can otherwise consume
for any of the following reasons:
•
•
•
•
The charger input is under input current limit
The charger input voltage is low
The charger is in thermal foldback
The system load is consuming adapter current. Note that the system load always gets priority over the battery charge
current.
The following events cause the state machine to exit this state:
•
•
When the charger current is below I
for t , the charger enters the next state in the charging cycle, top off.
TERM
TO
If the battery charger remains in this state for longer than t , the charger state machine transitions to the timer fault
FC
state.
Top-Off State
As shown in Figure 6, the top-off state can only be entered from the fast-charge CV state when the charger current
decreases below I
for t
. In the top-off state, the battery charger tries to maintain V
across the battery
TO
and typically the charge current is less than or equal to I
TERM
BATTREG
.
TO
The smart power selector control circuitry might reduce the charge current lower than the battery can otherwise consume
for any of the following reasons:
•
•
•
•
The charger input is under input current limit
The charger input voltage is low
The charger is in thermal foldback
The system load is consuming adapter current. Note that the system load always gets priority over the battery charge
current.
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Maxim Integrated | 21
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
The following events cause the state machine to exit this state:
•
•
After being in this state for the top-off time (t ), the charger enters the next state in the charging cycle, done.
TO
If V
< V
– V
BATTREG
, the charger goes back to the fast-charge (CC) state
RSTRT
BATT
Done State
As shown in Figure 6, the battery charger enters the done state after the charger has been in the top-off state for t
.
TO
The following event causes the state machine to exit this state:
•
If V
< V
– V
the charger goes back to the fast-charge (CC) state
RSTRT,
BATT
BATTREG
In the done state, the charge current into the battery (I
) is 0A. In the done state, the charger presents a very low
CHG
quiescent current to the battery. If the system load presented to the battery is low (<100μA), then a typical system can
remain in the done state for many days. If left in the done state long enough, the battery voltage decays below the restart
threshold (V
), and the charger state machine transitions back into the fast-charge CC state. There is no soft-start
RSTRT
(di/dt limiting) during the done-to-fast-charge state transition.
Timer Fault State
The battery charger provides a charge timer to ensure safe charging. As shown in Figure 6, the charge timer prevents
the battery from charging indefinitely. The time that the charger is allowed to remain in each of the prequalification states
is t . The time that the charger is allowed to remain in the fast-charge CC and CV states is t . Finally, the time that the
PQ FC
charger is in the top-off state is t . Upon entering the timer fault state, STAT becomes Hi-Z.
TO
In the timer fault state, the charger is off. The charger input can be removed and re-inserted to exit the timer fault state
(See the “any state” bubble in the lower left of Figure 6).
Thermal Shutdown State
As shown in Figure 6, the thermal shutdown state occurs when the battery charger is in any state and the junction
temperature (T ) exceeds the device’s thermal-shutdown threshold (T
). When T is close to REG, the charger folds
J
SHDN
J
back the input current limit to 0A so that the charger and inputs are effectively off.
In the thermal shutdown state, the charger is off.
Reverse Boost Mode
The DC-DC converter topology of the MAX77757 allows it to operate as a buck converter or as a reverse boost converter.
The modes of the DC-DC converter are controlled by ENBST. When ENBST = high and CHGIN voltage is lower than
0.7V, the DC-DC converter operates in reverse boost mode allowing it to source current to BYP and CHGIN. This mode
is commonly referred to as OTG mode or a source role.
The current through the BYP to CHGIN switch is limited to a 1.5A minimum. When the reverse boost mode is enabled,
the unipolar CHGIN transfer function measures current going out of CHGIN.
The BYP to CHGIN switch automatically retries after 300ms if CHGIN loading exceeds the 1.5A current limit. If the
overload at CHGIN persists, then the CHGIN switch toggles ON and OFF with approximately 60ms ON and 300ms OFF.
Under the reverse boost mode, the CC pins enter the low power source mode until the connection is established. Once
Rd is detected, the MAX77757 enables the 180μA current source of the active CC pin, whereas the other CC pin stays
high impedance.
Main Battery Overcurrent Protection During System Power-Up
The main battery overcurrent protection during system power-up feature limits the main battery to system current to
I
if V
is less than V
. This feature limits the surge current that typically flows from the main battery to the
SYSPU
SYSPU
SYS
device’s low-impedance system bypass capacitors during a system power-up. System power-up occurs anytime that
energy from the battery is supplied to SYS when V < V . This “system power-up” condition typically occurs
SYS
SYSPU
when a battery is hot-inserted into an otherwise unpowered device.
When “system power-up” occurs due to hot-insertion into an otherwise unpowered device, a small delay is required for
this feature’s control circuits to activate. A current spike over I
might occur during this time.
SYSPU
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Maxim Integrated | 22
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Main Battery Overcurrent Protection Due To Fault
The MAX77757 protects itself, the battery, and the system from potential damage due to excessive battery discharge
current. Excessive battery discharge current can occur for several reasons such as exposure to moisture, a software
problem, an IC failure, a component failure, or a mechanical failure that causes a short circuit.
When the main battery (BATT)-to-system (SYS) discharge current (I
) exceeds 6A for at least t
BATT
, then the
BOVRC
MAX77757 disables the BATT-to-SYS discharge path (Q
switch) and turns off the buck. Under OCP fault condition,
BAT
) for tocp_retry, the MAX77757 restarts on its own and attempts to pull up SYS again.
when SYS is low (V
< V
SYSUP
SYS
If the fault condition remains, the whole cycle repeats until this fault condition is removed.
Thermal Management
The MAX77757 charger uses several thermal management techniques to prevent excessive battery and die
temperatures.
Thermal Foldback
Thermal foldback maximizes the battery charge current while regulating the MAX77757 junction temperature. As shown
in Figure 9, when the die temperature exceeds the REGTEMP (T
), a thermal limiting circuit reduces the battery
REG
charger’s target current by 5% of the fast-charge current per 1°C (A
), which corresponds to 157.5mA/°C when the
TJREG
fast-charge current is 3.15A. For lower programmed charge currents such as 480mA, this slope is valid for charge current
reductions down to 80mA; below 100mA, the slope becomes shallower but the charge current reduces to 0A if the junction
temperature is 20°C above the programmed loop set point. The target charge current reduction is achieved with an analog
control loop (i.e., not a digital reduction in the input current).
DRAWN TO SCALE, VCHGIN = 5.0V, VSYS = 0A, CHGIN INPUT CURRENT LIMIT IS SET FOR MAXIMUM
IFC = 3.15A
3.0A
ATJREG = -5%/°C
2.0A
1.0A
0.0A
TJREG + 20°C
TJREG
JUNCTION TEMPERATURE (°C)
Figure 9. Charge Currents vs. Junction Temperature
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Maxim Integrated | 23
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Thermistor Input (THM)
The thermistor input can be utilized to achieve functions that include charge suspension, JEITA-compliant charging, and
disabling the charger.
The charger can be disabled by pulling the THM pin to ground. Figure 11 shows a recommended system diagram where
the MCU has a GPIO output connected to THM to enable or disable charging, and a GPIO input connected to INOKB to
check the presence of a valid charger. Note that the GPIO output should be an open-drain type.
JEITA Compliance
The MAX77757J version safely charges batteries in accordance with JEITA specifications. The MAX77757J version
monitors the battery temperature with an NTC thermistor connected at the THM pin and automatically adjusts the fast-
charge current or charge termination voltage as the battery temperature varies.
The JEITA controlled fast-charge current is reduced to 50% of the detected fast charge current for T
< T < T .
COOL
COLD
The charge termination voltage for T
< T < T
HOT
is reduced to programmed termination voltage -150mV, as shown
WARM
in Figure 10. Charging is suspended when the battery temperature is too cold or too hot (T < T
or T
HOT
< T).
COLD
The MAX77757H version disables the JEITA under warm and cool conditions and stops charging when the temperature
is too hot or cold. See the Ordering Information for details.
Temperature thresholds (T
, T
, T
, and T ) depend on the thermistor selection. See the Thermistor
HOT
COLD COOL WARM
Input (THM) section for more details.
Since the thermistor monitoring circuit employs an external bias resistor from THM to PVL, the thermistor is not limited
only to 10kΩ (at +25ºC); any resistance thermistor can be used if the value is equivalent to the thermistors +25ºC
resistance. The thermistor installed on the evaluation kit is 10kΩ with a beta of 3435.
The general relation of thermistor resistance to temperature is defined by the following equation:
1
1
−
)]
푅푇 = 푅25 × 푒[훽×(
푇+273 298
where
R = The resistance in Ω of the thermistor at temperature T in Celsius
T
R
25
= The resistance in Ω of the thermistor at +25ºC
β = The material constant of the thermistor, which typically ranges from 3000k to 5000k
T = The temperature of the thermistor in Celsius
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Maxim Integrated | 24
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
ICHGCC_NORMAL
ICHGCC_COOL
TEMPERATURE
TCOLD
TCOOL
TWARM
THOT
VCHGCV_NORMAL
CHGCV_PRM-150mV/cell
TEMPERATURE
TCOLD
TCOOL
TWARM
THOT
Figure 10. MAX77757J Version JEITA Compliance
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Maxim Integrated | 25
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
ICHGCC_NORMAL
TEMPERATURE
TCOLD
TCOOL
TWARM
THOT
VCHGCV_NORMAL
TEMPERATURE
TCOLD
TCOOL
TWARM
THOT
Figure 11. MAX77757H Version Hot/Cold Stop
V
DD
Internal Supply
V
is the 1.8V power for the MAX77757 charger’s analog circuit. V
chooses the higher value between the BATT and
DD
DD
has a bypass capacitance of 2.2µF.
CHGIN as power input source. V
DD
ENBST For Reverse Boost
ENBST is an input control signal for the reverse boost mode with an external logic signal. If ENBST is driven high, the
reverse boost is enabled and the BYP to CHGIN path is closed. It has an internal 235kΩ pulldown resistor. When ENBST
sets high, the MAX77757 disconnects Rd from the CC line and provides 180μA current source.
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Maxim Integrated | 26
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
USB BC1.2 Charger Detection
Features
•
•
•
•
D+/D- Charging Signature Detector
USB BC1.2 Compliant
SDP, DCP, and CDP Detection
Detect Proprietary Charger Types
®
• Apple 500mA, 1A, 2A, 12W
®
• Samsung 2A
Description
The USB charger detection is USB BC1.2 compliant with the ability to automatically detect some common proprietary
charger types.
The Charger Detection State Machine follows USB BC1.2 requirements and detects SDP, CDP, and DCP types. The
Charger Detection State Machine indicates if D+/D- were found as open but ChgTyp indicates SDP as required by BC1.2
specifications.
In addition to the USB BC1.2 State Machine, the IC also detects a limited number of proprietary charger types (Apple,
Samsung, and generic 500mA). The UIC automatically sets the CHGIN input current limiting based on the charger type
detection results. If the charger type detection results are from an unknown charger type or data contact detection timed
out, the input current limits are set to a maximum of 3A.
Table 1. BC1.2 Charger Type
USB BC1.2 DETECTED CHARGER TYPE
INPUT CURRENT LIMIT
CHARGER DETECTED
500mA
500mA
1.5A
The default setting before charger detection
SDP
CDP
DCP
1.5A
Table 2. Proprietary Charger Type
DETECTED PROPRIETARY CHARGER TYPE
INPUT CURRENT LIMIT
CHARGER DETECTED
500mA
1A
Apple
Apple
2A
Apple
2.4A
2A
Apple
Samsung
All others
3A
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Maxim Integrated | 27
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
USB Type-C CC Detection
Features
•
•
•
USB Type-C sink support
CC source detection and automatically set the input current limit according to source capability
Source role is supported by ENBST pin
CC Description
The MAX77757 works as a sink compliant to USB Type-C rev1.2. The USB Type-C functions are controlled by a
logic state machine that follows the USB Type-C requirements. The MAX77757 sets the CHGIN input current limit
based on the current advertised on the CC wires. Source role is enabled by the ENBST pin. When source role is
enabled, Rd is removed and a 180μA current source is connected.
Detecting Connected Source
When a source is detected, the USB Type-C state machine auto-detects the active CC line. The state machine also auto-
detects the source advertised current (500mA, 1.5A, and 3.0A). Upon detection of a change in advertised current, the
MAX77757 automatically sets the input current limit.
Enable Source Role
ENBST = high enables the MAX77757's source role. The MAX77757 disconnects Rd from the CC line and connects a
180μA current source to advertise a 5V/1.5A power source. The MAX77757 enables the reverse boost and supplies
5.1V/1.5A through the CHGIN pin.
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Maxim Integrated | 28
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Applications Information
Fast-Charge Current and Top-Off Current Setting
While a valid input source is present, the battery charger attempts to charge the battery with a fast-charge current
determined by the resistance from IFAST to GND. Top-off current matches to the fast-charge current. Table 3 shows
resistance values which correspond to target IFAST and ITOPOFF values.
Table 3. Fast-Charge Current and Top-Off Current Setting
RESISTANCE (kΩ)
IFAST (mA)
3150
3000
2800
2500
2400
2200
2000
1800
1500
1400
1200
1000
800
ITOPOFF (mA)
24.9
22.6
20.5
18.7
16.9
15.4
14
150
150
125
125
125
100
100
75
12.4
11
75
9.53
8.2
75
50
6.65
5.23
3.6
50
50
600
50
2.4
500
50
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Maxim Integrated | 29
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
D+/D- Multiplexing
USB D+/D- lines, which are used for the detection of BC1.2 and proprietary Travel Adaptors (TAs), can be used for data
communication. If an MCU handles this communication in the target system, the D+/D- lines can be connected to the
MAX77757 and the MCU as show in Figure 12. Switchers are required for each D+ and D- line to guarantee Hi-Z for the
connections to MCU to avoid wrong detections of TAs (see Figure 12). It is recommended to connect the INOKB of the
MAX77757 to the MCU in this configuration so that the MAX77757 can signal the completion of the detection to the MCU.
Once the MCU receives a valid INOKB signal, it can switch the D+/D- lines from the MAX77757 to the MCU for data
communication.
USB TYPE-C
CONNECTOR
CHGIN
CC1
VBUS
CC1
CC2
D+
CC2
MAX77757
DP
D-
DN
INOKB
GPIO
GPIO
MCU
D+
D-
Figure 12. D+/D- Connections in a Reference System
Capacitor Selection
All capacitors should be X5R dielectric or better. Be aware that multi-layer ceramic capacitors have large-voltage
coefficients. Before selecting capacitors, check the sufficient voltage rating and derated capacitance at max operating
voltage conditions. Table 5 shows proper capacitors after considering the derating and operating voltage.
Table 4. Capacitor Selections
PIN
TYPE
2.2µF/16V
CHGIN Capacitor
BYP Capacitor
SYS Capacitor
BATT Capacitor
10µF + 22µF/16V
2x10µF/10V
10µF/10V
V
Capacitor
2.2µF/10V
DD
PVL Capacitor
BST Capacitor
2.2µF/10V
0.1μF/6.3V
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Maxim Integrated | 30
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Non-USB Type Power Source
In an application where the power source is not USB, all the USB-related pins such as CC1, CC2, DP, and DN should be
left unconnected. In this case, the input current to MAX77757 is limited to 3A.
Recommended PCB Layout and Routing
Place all bypass capacitors for CHGIN, BYP, SYS, V , and BATT as close as possible to the IC. Provide a large copper
DD
ground plane to allow the PGND pad to sink heat away from the device. Use wide and short traces for high current
connections such as CHGIN, BYP, SYS, and BATT to minimize voltage drops. The MAX77757 has two kinds of ground
pins, PGND and GND. Use caution when connecting PGND since it is the switching node ground of the Charger Buck; it
should be tied to the ground of the SYS and BYP capacitor and connected to the ground plane directly without sharing
the other ground. The GND can be connected to the ground plane.
Figure 13 is a recommended placement and layout guide.
CBYP
INDUCTOR
CBYP
CCH
GIN
RES
CVDD
RES
THERMISTOR
Figure 13. Recommended Placement and Layout
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Maxim Integrated | 31
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Inductor Selection
The MAX77757's control scheme requires an external inductor from 0.47μH to 1μH for proper operation.
Table 5. Recommended Inductors
INDUCTANCE
I
I
DCR (TYP)
SIZE (L x W x T)
(mm)
SAT(TYP) RMS(TYP)
MANUFACTURER
PART NUMBER
(μH)
(A)
5.5
6
(A)
4.5
4.5
5
(mΩ)
SEMCO
SEMCO
SEMCO
CYNTEC
CIGT252008LMR47MNE
CIGT252010LMR47MNE
CIGT201610EHR47MNE
HTEH25201T-R47MSR-63
0.47
0.47
0.47
0.47
24
24
2.5 x 2.0 x 0.8
2.5 x 2.0 x 1.0
2.0 x 1.6 x 1.0
2.5 x 2.0 x 1.0
5.9
6.6
18
5.6
16.5
Charger Status Outputs
Input Status (INOKB)
INOKB is an open-drain and active-low output that indicates input status. If a valid input source is inserted and the buck
converter starts switching, INOKB pulls low. When the reverse boost is enabled, INOKB pulls low to indicate 5V output
from CHGIN.
INOKB can be used as a logic output for the system processor by adding a 200kΩ pullup resistor to the system I/O
voltage.
INOKB can also be used as a LED indicator driver by adding a current limit resistor and a LED to SYS.
Charging Status Output (STAT)
STAT is an open-drain and active-low output that indicates charge status. STAT status changes as shown in Table 6.
Table 6. STAT Output Per Charging Status
CHARGING STATUS
STAT
High impedance
LOGIC STATE
CHARGE STATUS LED
No input
High
Off
Trickle, precharge, fast
charge
Repeat low and high impedance
with 1Hz, 50% duty cycle
After an external diode and a
capacitor rectifier, high
Blinking with 1Hz, 50% duty
cycle
Top-off and done
Faults
Low
Low
Solid on
Off
High impedance
High
STAT can be used as a logic output for the system processor by adding a 200kΩ pullup resistor to the system I/O voltage
and a rectifier (a diode and a capacitor).
STAT also can be used as a LED indicator driver by adding a current limit resistor and a LED to SYS.
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Maxim Integrated | 32
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Typical Application Circuit
USB TYPE-C
CONNECTOR
4.5V TO 13.7V/3A
23
24
22
CHGIN
BYP
VBUS
10µF+
22µF
2.2µF
CHGIN
CC2
4
CC2
CC1
D+
1
5
BST
CC1
DP
0.1µF
6
7
20
LX
21
LX
0.47µH
DN
D-
15
VSYS
SYS
16
MAX77757
SYS
SYS
MAX4906
2x
10µF
17
PVL
2.2µF
VPVL
1kΩ
1kΩ
18
19
PGND
PGND
3
STAT
2
INOKB
IFAST
11
12
THM
BATTERY PACK
THERMISTOR
3.15A
13
14
BATT
BATT
24.9kΩ
10µF
T
10
9
D- D+
VDD
2.2µF
8
GND
ENBST
ENBST
MCU
GPIO
THM
(OPEN-DRAIN
OUTPUT)
Figure 14. Typical Application Circuit
Ordering Information
BATTERY
TERMINATION
VOLTAGE (V)
BATTERY
CHEMISTRY
PART NUMBER
TEMP RANGE
PIN-PACKAGE
THM
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
MAX77757JEFG420+
MAX77757JEFG420+T
MAX77757JEFG430+*
MAX77757JEFG430+T*
MAX77757JEFG435+
MAX77757JEFG435+T
MAX77757JEFG440+
MAX77757JEFG440+T
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
JEITA
JEITA
JEITA
JEITA
JEITA
JEITA
JEITA
JEITA
4.20
4.20
4.30
4.30
4.35
4.35
4.40
4.40
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Maxim Integrated | 33
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
BATTERY
BATTERY
CHEMISTRY
PART NUMBER
TEMP RANGE
PIN-PACKAGE
THM
TERMINATION
VOLTAGE (V)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
24 FC2QFN
(3mm x 3mm)
Li-ion
Li-polymer
Li-ion
MAX77757JEFG450+*
MAX77757JEFG450+T*
MAX77757HEFG360+
MAX77757HEFG360+T
MAX77757HEFG370+*
MAX77757HEFG370+T*
MAX77757HEFG420+*
MAX77757HEFG420+T*
MAX77757HEFG430+*
MAX77757HEFG430+T*
MAX77757HEFG435+*
MAX77757HEFG435+T*
MAX77757HEFG440+*
MAX77757HEFG440+T*
MAX77757HEFG450+*
MAX77757HEFG450+T*
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
JEITA
4.50
4.50
3.60
3.60
3.70
3.70
4.20
4.20
4.30
4.30
4.35
4.35
4.40
4.40
4.50
4.50
JEITA
Li-polymer
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
HOT/COLD STOP
LiFePO4
LiFePO4
LiFePO4
LiFePO4
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
Li-ion
Li-polymer
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*Future product—contact factory for availability.
www.maximintegrated.com
Maxim Integrated | 34
MAX77757
3.15A USB Type-C Autonomous Charger with
JEITA for 1-Cell Li-ion/LiFePO4 Batteries
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
1
3/21
3/21
Initial release
Updated Ordering Information table
—
33, 34
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Smart Power Selector is a trademark of Maxim Integrated Products, Inc.
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Samsung is a registered trademark of Samsung Electronics Co., Ltd.
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2021 Maxim Integrated Products, Inc.
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