SGM41522A [SGMICRO]
Compact Switch, 2.5A Standalone Single-Cell Battery Charger with Safe and Reliable Charging;
| 型号： | SGM41522A |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Compact Switch, 2.5A Standalone Single-Cell Battery Charger with Safe and Reliable Charging 电池 |
| 文件： | 总17页 (文件大小：816K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM41522/SGM41522A
Compact Switch, 2.5A Standalone
Single-Cell Battery Charger
with Safe and Reliable Charging
GENERAL DESCRIPTION
FEATURES
The SGM41522 and SGM41522A are compact switch
standalone battery chargers for single-cell Li-Ion or
Li-polymer battery. They are featured with resistor
programmable maximum charge current, ordering
selections of preset end of charge current and
pre-charge current and floating time out. The
SGM41522 and SGM41522A also have other safety
features, such as over-voltage and over-current
protections, fold-back retaining, input under-voltage
lockout, battery temperature monitoring and thermal
shutdown. These features ensure safe and reliable
operation, ease of design and a comfortable user
experience.
● Maximum 2.5A Charging for 4.1V to 4.45V Battery
● 1.33MHz Switch Frequency
● Up to 95.4% Charge Efficiency
● 92.8% Charge Efficiency at 1.5A from 5V Input
● 90.1% Charge Efficiency at 1.5A from 9V Input
● Charging Voltage and Current Programmable
● CC/CV Interface for Charge Current and Battery
Voltage Settings
● 4.2V Input Voltage Regulation
● 4.2V to 12V Operating Input Voltage Range
● Up to 18V Sustainable Voltage
● 13.5V Over-Voltage Protection with 100ns
Turn-Off Timer
● Output Voltage Fold-Back Retaining
● JEITA Guideline Compliance
The SGM41522 and SGM41522A are available in a
Green TDFN-2×3-8BL package. They operate over an
ambient temperature range of -40℃ to +85℃.
T2 Threshold 10℃ (SGM41522)
T2 Threshold 15℃ (SGM41522A)
● -40℃ to +85℃ Operating Temperature Range
● Available in a Green TDFN-2×3-8BL Package
APPLICATIONS
Portable Audio Speaker
Mobile Phone
Wearables
EPOS
SG Micro Corp
AUGUST2022–REV. A
www.sg-micro.com
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
RE1
XXXX
SGM41522
TDFN-2×3-8BL
TDFN-2×3-8BL
SGM41522YTDC8G/TR
SGM41522AYTDC8G/TR
Tape and Reel, 3000
Tape and Reel, 3000
-40℃ to +85℃
-40℃ to +85℃
SHG
XXXX
SGM41522A
MARKING INFORMATION
NOTE: XXXX = Date Code and Trace Code.
Serial Number
Y Y Y
X X X X
Trace Code
Date Code - Year
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
ABSOLUTE MAXIMUM RATINGS
Voltage Range (with Respect to GND)
OVERSTRESS CAUTION
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
VBUS (Converter Not Switching) ........................ -2V to 18V
BTST (Converter Not Switching)...................... -0.3V to 18V
SW, BAT............................................................. -2V to 14V
BTST to SW....................................................... -0.3V to 6V
REGN, TS (Converter Not Switching)................ -0.3V to 6V
CC, CV............................................................... -0.3V to 6V
Package Thermal Resistance
ESD SENSITIVITY CAUTION
TDFN-2×3-8BL, θJA.................................................. 55℃/W
Junction Temperature.................................................+150℃
Storage Temperature Range.......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
This integrated circuit can be damaged if ESD protections are
not considered carefully. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because even small parametric changes could cause the
device not to meet the published specifications.
HBM.............................................................................2000V
CDM ............................................................................1000V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range, VVBUS .................................4.2V to 12V
Input Current (VBUS), IIN .....................................2.5A (MAX)
Output Current (SW), ISWOP..................................2.5A (MAX)
Battery Voltage, VBATOP......................................4.45V (MAX)
Fast Charge Current, ICHGOP ................................2.5A (MAX)
Ambient Temperature Range..........................-40℃ to +85℃
Junction Temperature Range .......................-40℃ to +125℃
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
AUGUST 2022
2
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
PIN CONFIGURATION
(TOP VIEW)
VBUS
CV
1
2
3
4
8
7
6
5
SW
BTST
REGN
BAT
GND
CC
TS
TDFN-2×3-8BL
PIN DESCRIPTION
PIN
NAME
TYPE (1)
FUNCTION
Charger Input and Voltage Sense. Connect a 10μF ceramic capacitor from VBUS pin to GND close to
device.
1
VBUS
P
Charge Voltage Programming Input Pin. Connect a resistor between this pin and GND, for feeding
different voltages to select 6 different charge voltages.
2
3
CV
CC
AI
AI
Charge Current Programming and Charging Inhibition Input Pin. Connect a resistor between this pin
and GND for programming the constant charge current by ICHGREG = K·VREF/RCC. Pull up this pin to a
voltage higher than VCC_H (1.4V) to stop charging.
Temperature Sense Input Pin. Connect to the battery NTC thermistor that is grounded on the other side.
To program operating temperature window, it can be biased by a resistor divider between REGN and
GND. Charge suspends if TS voltage goes out of the programmed range. It is recommended to use a
103AT-2 type thermistor.
4
TS
AI
If NTC or TS pin function is not needed, use a 10kΩ/10kΩ pair for the resistor divider.
5
6
BAT
P
P
Battery Positive Terminal Pin. Use a 22μF capacitor between BAT and GND pins close to the device.
LDO Output that Powers LSFET Driver and Internal Circuits. Internally, the REGN pin is connected to
the anode of the bootstrap diode. Place a 1μF (10V rating) ceramic capacitor between REGN pin and
GND. It is recommended to place the capacitor close to the REGN pin.
REGN
High-side Driver Positive Supply. It is internally connected to the bootstrap diode cathode. Use a 10nF
ceramic capacitor from SW pin to BTST pin.
7
8
BTST
SW
P
P
Switching Node Output. Connect SW pin to the output inductor. Connect the 10nF bootstrap capacitor
from SW pin to BTST pin.
Thermal Pad and Ground Reference. It is the ground reference for the device and also the thermal pad
to conduct heat from the device (not suitable for high current return). Tie externally to the PCB ground
plane (GND). Thermal vias under the pad are needed to conduct the heat to the PCB ground planes.
Exposed
Pad
GND
P
NOTE:
1. AI = Analog Input, AO = Analog Output, AIO = Analog Input and Output, DI = Digital Input, DO = Digital Output, DIO = Digital
Input and Output, P = Power.
SG Micro Corp
www.sg-micro.com
AUGUST 2022
3
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
ELECTRICAL CHARACTERISTICS
(VVBUS_UVLOZ < VVBUS < VVBUS_OV and VVBUS > VBAT + VSLEEP, TJ = -40℃ to +85℃, typical values are at TJ = +25℃, unless
otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Quiescent Currents
VBAT = 4.5V, VVBUS < VVBUS-UVLOZ or no VBUS
VBAT = 4.5V, VVBUS = 5V, fold-back mode
0.1
4.5
1.4
1.7
1.0
7.0
Battery Discharge Current (BAT)
Input Supply Current (VBUS)
IBAT
µA
VVBUS = 5V, VVBUS > VBAT, converter not switching
VVBUS = 12V, VVBUS > VBAT, converter not switching
2.2
IVBUS
mA
VBAT = 3.8V, VVBUS > VBAT, VVBUS > VVBUS_UVLOZ
converter switching
,
8
BAT Pin and VBUS Pin Power-Up
VBUS Operating Range
VVBUS_OP
VVBUS rising
4.2
13.2
3.46
V
V
VBUS for Device Active,
No Battery Sense VBUS Pin Voltage
VVBUS_UVLOZ
3.32
70
VVBUS rising, TJ = +25℃
Device Active Hysteresis
VVBUS_UVLOZ_HYS VVBUS falling from above VVBUS_UVLOZ
mV
VVBUS - VBAT, VVBUSMIN ≤ VBAT ≤ VREGN, VVBUS falling,
TJ = +25℃
Sleep Mode Falling Threshold
VSLEEP
80
165
mV
mV
VVBUS - VBAT, VVBUSMIN ≤ VBAT ≤ VREGN, VVBUS rising,
TJ = +25℃
Sleep Mode Rising Threshold
VSLEEPZ
100
175
260
VBUS 13V Over-Voltage Rising
Threshold
VVBUS_OV_RISE VVBUS rising
VVBUS_OV_HYS VVBUS falling
12.78
13.4
355
3.70
250
24
13.90
V
VBUS 13V Over-Voltage Hysteresis
mV
V
Bad Adapter Detection Falling
Threshold
VVBUSMIN
VVBUSMIN_HYS
IBAD_SRC
VVBUS falling
3.52
17
3.89
30
Bad Adapter Detection Hysteresis
mV
mA
Bad Adapter Detection Current
Source
Sink current from VBUS to GND, TJ = +25℃
Power Path Management
Total High-side MOSFET
On-Resistance - (Q1 + Q2)
Low-side Switching MOSFET
On-Resistance - Q3
RON_HSFET
RON_LSFET
VREGN = 5V
VREGN = 5V
150
110
mΩ
mΩ
Battery Charger
Charge Voltage Program Range
Charge Voltage Step
VBATREG_RANGE
VBATREG_STEP
4.10
4.45
V
TJ = +25℃
50
mV
4.174 4.200
4.162 4.200
4.320 4.347
4.308 4.347
0
4.265
4.272
4.416
4.423
2500
0.580
12.8
TJ = +25℃
RCV = 0Ω or floating
(4.2V)
TJ = -40℃ to +85℃
TJ = +25℃
Charge Voltage Setting
VBATREG
V
RCV = 22.1kΩ
(4.35V)
TJ = -40℃ to +85℃
Charge Current Regulation Range
ICHGREG_RANGE
mA
A
0.450 0.510
-10.8
ICHGREG = 0.515A, TJ = +25℃
ICHGREG = 1.235A, TJ = +25℃
%
A
1.155 1.235
-6.08
1.315
6.08
Charge Current Regulation Setting
ICHGREG
VBAT = 3.8V
%
A
1.470 1.535
1.600
ICHGREG = 1.535A, TJ = +25℃
ICHGREG = 1.535A,
1.450 1.535
1.620
A
TJ = -40℃ to +85℃
V
BAT = 2.6V,
ICHGREG = 0.515A
ICHGREG = 1.235A
55
115
190
Pre-Charge Current Regulation
Setting
IPRECHG
mA
TJ = +25℃, IPRECHG
is 10% of ICHGREG
130
SG Micro Corp
www.sg-micro.com
AUGUST 2022
4
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
ELECTRICAL CHARACTERISTICS (continued)
(VVBUS_UVLOZ < VVBUS < VVBUS_OV and VVBUS > VBAT + VSLEEP, TJ = -40℃ to +85℃, typical values are at TJ = +25℃, unless
otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Battery Charger
Battery LOW Falling Threshold
Battery LOW Rising Threshold
VBATLOW_FALL
2.68
2.79
3.10
51
2.91
V
V
ICHGREG = 600mA, TJ = +25℃
VBATLOW_RISE Pre-charge to fast charge
ICHGREG = 0.515A
ICHGREG = 1.235A
Termination Current Regulation
Setting
VBAT = 4.1V, TJ = +25℃,
ITERM
mA
V
ITERM is 10% of ICHGREG
123
2.05
2.19
33.5
VSHORT
VSHORTZ
ISHORT
2.01
2.14
2.11
2.25
VBAT falling, TJ = +25℃
VBAT rising, TJ = +25℃
VBAT < VSHORTZ
Battery Short Voltage
Battery Short Current
mA
mV
mV
Fold-Back Mode Threshold below
VBATREG
VFOLDBACK
VBAT falling
90
Recharge Threshold below VBATREG
Charge Current Amplification Ratio
VRECHG
K
85
140
190
VBAT falling, TJ = +25℃
10300
Constant Current Control Reference
Voltage
VREF
1
V
V
Input Voltage Regulation
Input Voltage Regulation Limit
BAT Pin Over-Voltage Protection
VINDPM
LVDPM version
4.16
VBATOVP_RISE
VBATOVP_FALL
VBAT rising
VBAT falling
103
101
104.5
102.5
106
104
As percentage of VBATREG
,
Battery Over-Voltage Threshold
%
TJ = +25℃
Thermal Regulation and Thermal Shutdown
Junction Temperature Regulation
Threshold
TJUNCTION_REG Temperature increasing
110
℃
Thermal Shutdown Rising
Temperature
TSHUT
Temperature increasing
150
10
℃
℃
Thermal Shutdown Hysteresis
TSHUT_HYS
JEITA Thermistor Comparator
T1 (0℃) Threshold Voltage
Charger suspends if temperature T is below T1
(T < T1), as percentage to VREGN
73.2
71.3
68.1
66.6
65.1
%
%
%
%
%
on TS Pin
VT1
VT2
VT2
VT3
VT4
VT1 Falling
As percentage of VREGN
Charge back to ICHGREG/10 and VBATREG - 100mV
if T1 < T <T2, as percentage of VREGN (SGM41522)
T2 (10℃) Threshold Voltage
on TS Pin
VT2 Falling
As percentage of VREGN (SGM41522)
Charge back to ICHGREG/10 and VBATREG - 100mV
if T1 < T< T2, as percentage of VREGN (SGM41522A)
T2 (15℃) Threshold Voltage
on TS Pin
VT2 Falling
VT3 Rising
As percentage of VREGN (SGM41522A)
As percentage of VREGN
63.3
46.0
%
%
T3 (45℃) Threshold Voltage
on TS Pin
Charge back to ICHGREG/10 and VBATREG - 100mV
if T3 < T <T4, as percentage to VREGN
44.2
35.8
34.6
%
%
%
As percentage of VREGN
VT4 Rising
T4 (60℃) Threshold Voltage
on TS Pin
Charge suspended if T > T4,
as percentage of VREGN
SG Micro Corp
www.sg-micro.com
AUGUST 2022
5
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
ELECTRICAL CHARACTERISTICS (continued)
(VVBUS_UVLOZ < VVBUS < VVBUS_OV and VVBUS > VBAT + VSLEEP, TJ = -40℃ to +85℃, typical values are at TJ = +25℃, unless
otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Charge Over-Current Comparator (Cycle-by-Cycle)
HSFET Cycle-by-Cycle
IHSFET_OCP
4
A
Over-Current Threshold
Charge Under-Current Comparator (Cycle-by-Cycle)
LSFET Under-Current Falling
VLSFET_UCP
From sync mode to non-sync mode
100
mA
Threshold
PWM
PWM Switching Frequency
Maximum PWM Duty Cycle
REGN LDO
fSW
1.20
1.33
98
1.45
MHz
%
Oscillator frequency, Buck mode, TJ = +25℃
DMAX
VVBUS = 9V, IREGN = 40mA
VVBUS = 5V, IREGN = 20mA
4.70
4.79
4.90
4.86
5.10
4.92
REGN LDO Output Voltage
VREGN
V
REGN LDO Maximum Output
Current
IREGN_MAX
VVBUS = 5V
56
68
80
mA
TIMING REQUIREMENTS
PARAMETER
VVBUS/VBAT Power-Up
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VBUS OVP Reaction Time
tACOV
VVBUS rising above ACOV threshold to turn off Q2
100
42
ns
Wait Window for Bad Adapter
Detection
tBAD_SRC
ms
Battery Charger
Deglitch Time for Charge Termination
Deglitch Time for Recharge
tTERM_DGL
168
168
ms
ms
tRECHG_DGL
Battery Over-Voltage Deglitch Time to
Disable Charge
tBATOVP
1
µs
SG Micro Corp
www.sg-micro.com
AUGUST 2022
6
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
TYPICAL PERFORMANCE CHARACTERISTICS
Charging Efficiency vs. Charge Current
Constant Charge Voltage Accuracy vs. Battery Voltage
100
96
92
88
84
80
76
0.4
0.2
VVBUS = 5V, Fast Charging Current = 2A
VBAT = 4.2V, Inductor DCR = 5.5mΩ
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
CV = 4.1V
CV = 4.2V
CV = 4.3V
CV = 4.35V
CV = 4.4V
CV = 4.45V
VVBUS = 5V
V
V
VBUS = 9V
VBUS = 12V
0.1 0.4 0.7
1
1.3 1.6 1.9 2.2 2.5 2.8
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
Charge Current (A)
Charge Current (A)
Fast Charge Current vs. Battery Voltage
CV = 4.4V, Fast Charging Current = 1.2A
Constant Charge Voltage Accuracy vs. Battery Voltage
VVBUS = 9V, Fast Charging Current = 2A
1300
1280
1260
1240
1220
1200
1180
1160
1140
1120
1100
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
CV = 4.1V
CV = 4.2V
CV = 4.3V
CV = 4.35V
CV = 4.4V
CV = 4.45V
VVBUS = 5V
V
V
VBUS = 9V
VBUS = 12V
3
3.2
3.4
3.6
3.8
4
4.2
4.4
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
Battery Voltage (V)
Charge Current (A)
Fast Charge Current vs. Battery Voltage
CV = 4.4V, Fast Charging Current = 2A
Constant Charge Voltage Accuracy vs. Battery Voltage
VVBUS = 12V, Fast Charging Current = 2A
2100
2075
2050
2025
2000
1975
1950
1925
1900
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
CV = 4.1V
CV = 4.2V
CV = 4.3V
CV = 4.35V
CV = 4.4V
CV = 4.45V
VVBUS = 5V
V
V
VBUS = 9V
VBUS = 12V
3
3.2
3.4
3.6
3.8
4
4.2
4.4
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
Battery Voltage (V)
Charge Current (A)
SG Micro Corp
www.sg-micro.com
AUGUST 2022
7
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Charge Enabled
Charge Disabled
VVBUS = 5V, 3.8V Battery, 2A Charge Enabled
VVBUS = 5V, 3.8V Battery, 2A Charge Disabled
TS
TS
REGN
REGN
SW
IBAT
SW
IBAT
Time (500μs/div)
Time (500μs/div)
Power-Up with Charge Enabled
Power-Up with Charge Enabled
VVBUS = 5V, No Battery, Charge Enabled
VVBUS = 5V, 3.8V Battery, 2A Charge Enabled
VBUS
REGN
VBUS
SW
VBAT
SW
IBAT
Time (20ms/div)
Time (50ms/div)
Power-Up with Charge Enabled
Power-Up with Charge Enabled
VVBUS = 9V, 3.8V Battery, 2A Charge Enabled
VBUS
VBUS
REGN
SW
REGN
SW
VVBUS = 12V, 3.8V Battery,
2A Charge Enabled
IBAT
IBAT
Time (20ms/div)
Time (20ms/div)
SG Micro Corp
AUGUST 2022
www.sg-micro.com
8
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
TYPICAL APPLICATION CIRCUIT
L 1μH
4.2V to 12V
System Load
USB
VBUS
SW
CIN
10μF
CBTST
10nF
COUT
22μF
BTST
BAT
GND
SGM41522
SGM41522A
CV
CC
VREGN
REGN
TS
RCV
CREGN
1μF
ICHG = 2.5A
RT1
PWM
RCC
RT2
Figure 1. Typical Application Circuit
SG Micro Corp
AUGUST 2022
www.sg-micro.com
9
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
FUNCTIONAL BLOCK DIAGRAM
VBUS
RBFET (Q1)
REGN
LDO
REGN
BTST
Q1
Control
Protections:
Voltage & Current
Sensing
OVP
UVP
OCP
UCP
OTP
&
DAC Reference
HSFET (Q2)
SW
Converter
Control
REGN
LSFET (Q3)
GND
BAT
Digital
Control
BAT_OVP
Recharge
Termination
BATLOWV
BATSHORT
Fold-Back
CC
CV
Battery
Temperature
Sensing
CC/CV
Interface
JEITA
Control
TS
SGM41522/SGM41522A
Figure 2. Block Diagram
SG Micro Corp
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AUGUST 2022
10
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
DETAILED DESCRIPTION
mode according to JEITA profile. This device also features
thermal regulation in which the charge current is reduced if
the junction temperature exceeds 110℃.
Overview
The SGM41522 and SGM41522A are highly-integrated 2.5A
switch-mode stand-alone battery charge management
devices for applications such as cell phones, tablets and
portable devices that use single-cell Li-Ion and Li-polymer
batteries. The devices have a low impedance power path that
improves the operation efficiency of the switch-mode,
reduces the battery charging time and extends battery life in
the discharging phase. The charging setting with the CC/CV
interface makes the device a flexible solution. These devices
include three main power switches: input reverse blocking
FET (RBFET, Q1), high-side switching FET (HSFET, Q2) and
low-side switching FET (LSFET, Q3). The bootstrap diode of
the high-side gate drive is also integrated to simplify the
system design.
Power-On Reset (POR)
The internal circuit of the device is powered from the voltage
VVBUS. When the voltage of VBUS goes above its UVLO level
(VVBUS > VVBUS_UVLOZ), a POR happens and activates the
sleep comparator. Upon activation, the CC/CV interface will
also be ready for charge current and voltage settings.
Battery Charging Management
Battery Charging Profile
The SGM41522 and SGM41522A feature a full battery
charging profile with five phases. In the beginning of the cycle,
the battery voltage (VBAT) is tested and appropriate current
and voltage regulation levels are selected as shown in Table
1. Depending on the detected status of the battery, the proper
phase is selected to start or for continuation of the charging
cycle. The phases are trickle charge (VBAT < 2.19V),
pre-charge, fast-charge (constant current and constant
voltage) and fold-back mode.
The start and termination of a charging cycle can be
accomplished without software control. The sensed battery
voltage is used to decide the starting phase of charge in one
of the three phases of charge cycle: pre-conditioning,
constant current or constant voltage. When the charge
current falls below a preset limit and the battery voltage is
above recharge threshold, the charger function will
automatically terminate and end the charging cycle. When the
voltage of a charged battery is below the recharge threshold,
the charger starts another charging cycle.
Table 1. Charge Current Setting Based on VBAT
VBAT Voltage
< 2.19V
Charge Current
ISHORT
The SGM41522 and SGM41522A have several safety
features, such as over-voltage and over-current protections,
battery temperature monitoring, input UVLO and thermal
shutdown. TS pin is connected to an NTC thermistor for
battery temperature monitoring and protection in charge
2.19V to 3V
> 3V
IPRECHG
ICHGREG
Regulation Voltage
VBATREG
Fold-Back Voltage
Battery Voltage
Charge Current
ICHGREG
Charge Current
VBATLOW (3V)
V
SHORTZ (2.19V)
IPRECHG
ITERM
ISHORT
Trickle Charge Pre-charge
Fast Charge and Voltage Regulation
Fold-Back
Figure 3. Battery Charging Profile
SG Micro Corp
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AUGUST 2022
11
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
DETAILED DESCRIPTION (continued)
At cool temperature (T1 - T2) or at warm temperature (T3 -
T4), the charge current reduces to 10% of the charge current,
and the charge voltage is decreased by about 100mV
automatically.
Charge Termination
A charge cycle is terminated when the battery voltage is
higher than the recharge threshold and the charge current
falls below the programmed termination current. The
termination current is programmed to ICHGREG/10 with a
minimum clamped value of 50mA (TYP). To fully charge a
battery, it is recommended to set the ICHGREG to be much
higher than 50mA. After the charging cycle is completed, the
converter enters fold-back mode.
SGM41522
SGM41522A
BAT
REGN
22μF
The SGM41522 and SGM41522A have no battery switch but
provide an alternative way for battery safe and extended
battery life, which is the voltage fold-back mode when a
battery is fully charged while the input power is kept. This
alternative has less energy loss as no switch in the discharge
loop. The only penalty is that it could not support instant start
if the battery voltage is excessive low, in which condition it
takes a few more minutes for the load system to be ready for
start. When the device operates in FBM, the output voltage is
VFOLDBACK lower than VBATREG, and the output current limit is
ICHGREG_FOLDBACK (2.4A).
1μ
F
RT1
TS
NTC
103AT-2
RT2
Figure 4. Battery Thermistor Connection and Bias Network
The resistor bias network (see Figure 4) can be calculated
based on the following equations:
1
1
Compliance with JEITA Guideline
JEITA guideline (April 20, 2007 release) is implemented in the
device for safe charging of the Li-Ion battery. JEITA highlights
the considerations and limits that should to be considered for
charging at cold or hot battery temperatures. High charge
current and voltage must be avoided outside normal
operating temperatures (typically 0 ℃ and 60 ℃ ). This
functionality can be disabled if not needed. Four temperature
levels are defined by JEITA from T1 (minimum) to T4
(maximum). Outside this range, charging should be stopped.
The corresponding voltages sensed by NTC are named VT1 to
VT4. Due to the sensor negative resistance, a higher
temperature results in a lower voltage on TS pin. The battery
cool range is between T1 and T2, and the warm range is
between T3 and T4. Charge must be limited in the cool and
warm ranges.
RTHCOLD ×RTHHOT
×
−
(1)
VT1 VT4
RT2
=
1
1
RTHHOT
×
−1 −R
×
−1
THCOLD
VT4
VT1
1
VT1
−1
(2)
RT1
=
1
1
+
RT2
RTHCOLD
where VT1 and VT4 are TCOLD and THOT threshold voltage on
TS pin as percentage to VREGN. Select TCOLD = 0℃ and THOT
= 60℃ for Li-Ion or Li-polymer batteries. For a 103AT-2 type
thermistor RTHCOLD = 27.28kΩ and RTHHOT = 3.02kΩ, the
calculation results are: RT1 = 5.18kΩ and RT2 = 29.34kΩ. The
standard value is 5.23kΩ for RT1 and 29.4kΩ for RT2.
Table 2. Temperature Related Charging Control
One of the conditions for starting a charge cycle is having the
TS voltage within VT1 to VT4 window limits. If during the
charge, battery gets too cold or too hot and TS voltage
exceeds the T1 - T4 limits, charging is suspended (zero
charge current) and the controller waits for the battery
temperature to come back within the T1 to T4 window.
Temperature Range
Lower than T1
T1 - T2
Charge Current
Charge Voltage
/
/
ICHGREG × 10%
ICHGREG
ICHGREG × 10%
/
VBATREG - 100mV
VBATREG
T2 - T3
T3 - T4
VBATREG - 100mV
/
Higher than T4
SG Micro Corp
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AUGUST 2022
12
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
DETAILED DESCRIPTION (continued)
Battery Over-Discharge Protection
To recover from over-discharge, an input source is required at
VBUS pin. The battery is charged with ISHORT (33.5mA TYP)
when the VBAT < VSHORT, or with a pre-charge current when
Protections Features
Input Over-Voltage
If VBUS voltage exceeds VVBUS_OV, switching will stop
immediately. Charger resumes its normal operation when the
voltage comes back below OVP limit.
the battery voltage is between VSHORT and VBATLOW
.
Charging Voltage Programming
Thermal Regulation and Thermal Shutdown
Internal junction temperature (TJ) is always monitored to
avoid overheating. A limit of +110 ℃ is considered for
maximum IC surface temperature in Buck mode and if TJ
intends to exceed this level, the device reduces the charge
current to keep maximum temperature limited to +110℃
(thermal regulation mode). As expected, the actual charging
current is usually lower than programmed value during
thermal regulation.
Forcing a voltage on the CV pin, or grounding it with a resistor
that presents a similar voltage against the constant current
sourcing from the pin during charging selects 1 of 6 charging
voltages, as shown in Table 3.
Charge Current Programming and Turn-Off
Charge current is programmed by using different RCC
resistance or by providing voltage difference on the RCC by
forcing a voltage on the other end, which could be generated
by a DAC or PWM output.
If the junction temperature exceeds TSHUT (+150℃), thermal
shutdown protection arises in which the converter is turned
off.
Forcing the CC to a voltage higher than VCC_H (1.4V) turns the
device off.
When the device recovers and TJ falls below the hysteresis
band of TSHUT_HYS (10℃ under TSHUT), the converter resumes
automatically.
Battery Over-Voltage Protection
The over-voltage limit for the battery is 4.5% above the
battery regulation voltage setting. Charging will immediately
disable if a battery over-voltage occurs.
Table 3. Conditions for Selecting a Charging Voltage
Charging Voltage (V)
Forcing Voltage (V)
Separation Thresholds (V)
Recommended Grounding Resistance (kΩ)
4.1
4.2
0.45
0.3 ~ 0.6
< 0.3 or > 2.0
0.6 ~ 0.9
9.09
Grounding or Open
Grounding or Floating
4.3
0.75
1.05
1.4
15
21
4.35
4.4
0.9 ~ 1.2
1.2 ~ 1.6
28
4.45
1.8
1.6 ~ 2.0
35.7
NOTE: Sourcing current out of the CV is typically 50μA.
SG Micro Corp
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AUGUST 2022
13
SGM41522
SGM41522A
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
DETAILED DESCRIPTION (continued)
Layout Guide
3. Place output capacitor GND pin as close as possible to the
GND pin of the device and the GND pin of input capacitor CIN.
It is better to avoid using vias for these connections and keep
the high frequency currents paths very short and on the same
layer. A GND copper layer under the component layer helps
reducing noise emissions.
1. Place the input capacitor between VBUS and GND pins as
close as possible to the chip with shortest copper connections
(avoid vias).
2. Connect one pin of the inductor as close as possible to the
SW pin of the device and minimize the copper area
connected to the SW node to reduce capacitive coupling from
SW area to nearby signal traces. This decreases the noise
induced through parasitic stray capacitances and
displacement currents to other conductors. SW connection
should be wide enough to carry the charging current. Keep
other signals and traces away from SW if possible.
4. Solder the exposed thermal pad of the package to the PCB
ground planes. Ensure that there are enough thermal vias
directly under the IC, connecting to the ground plane on the
other layers for better heat dissipation and cooling of the
device.
VBUS
SW
1
2
3
4
8
CBTST
7
6
5
CV
CREGN
L1
REGN
CC
TS
RT1
RT2
COUT
TS
BAT
Top layer
Middle Layer
Bottom Layer
VIA_GND
VIA_TS
Figure 5. PCB Layout
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (AUGUST 2022) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
AUGUST 2022
14
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TDFN-2×3-8BL
D
e
N5
N8
L
k
E
E1
D1
N1
b
N4
BOTTOM VIEW
TOP VIEW
1.63
0.65
1.75
2.95
A
A1
A2
SIDE VIEW
0.25
0.50
RECOMMENDED LAND PATTERN (Unit: mm)
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
0.800
0.050
MIN
0.028
0.000
MAX
0.031
0.002
A
A1
A2
D
0.700
0.000
0.203 REF
0.008 REF
1.950
1.530
2.950
1.650
0.200
2.050
1.730
3.050
1.850
0.300
0.077
0.060
0.116
0.065
0.008
0.081
0.068
0.120
0.073
0.012
D1
E
E1
b
e
0.500 BSC
0.250 REF
0.020 BSC
0.010 REF
k
L
0.300
0.450
0.012
0.018
NOTE: This drawing is subject to change without notice.
SG Micro Corp
TX00141.001
www.sg-micro.com
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
TDFN-2×3-8BL
7″
9.5
2.30
3.30
1.10
4.0
4.0
2.0
8.0
Q2
SG Micro Corp
TX10000.000
www.sg-micro.com
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Reel Type
Pizza/Carton
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
www.sg-micro.com
TX20000.000
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