MP2611 [MPS]
2A, 1-Cell Li-Ion Battery Switching Charger For USB and Adapter Power;
| 型号： | MP2611 |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 2A, 1-Cell Li-Ion Battery Switching Charger For USB and Adapter Power 电池 |
| 文件： | 总22页 (文件大小：751K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP2611
2A, 1-Cell Li-Ion Battery Switching Charger
For USB and Adapter Power
The Future of Analog IC Technology
DESCRIPTION
FEATURES
•
•
•
•
•
•
•
4.5V-to-6V Operating Input Voltage
Up to 100% Duty Operation.
The MP2611 is a monolithic switching charger
with built-in power MOSFETs for a single-cell
Li-Ion battery pack. It achieves up to a 2A-
charge current that can be programmed
through an accurate sense resistor over the
whole input range. It can operate from separate
inputs for USB or AC adapter: For USB input,
the input current limit can be programmed to
500mA and 900mA through the USBM pin to
cover both USB2.0 and USB3.0 standards.
Up to 2A Programmable Charge Current
±0.5% Battery Voltage Accuracy
Separate Inputs for USB and AC Adapter
Fully-Integrated Power Switches
Programmable Input Current Limit for the
USB Port
•
No External Reverse Blocking Diode
Required
The MP2611 regulates the charge current and
battery voltage using two control loops to
realize highly accurate constant-current charge
and constant-voltage charge. A 100% duty
cycle can be achieved when battery voltage is
close to the input voltage due to the high-side
P-Channel MOSFET.
•
•
•
•
•
Charging Operation Indicators
Programmable Safety Timer
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Battery Temperature Monitor and Protection
APPLICATIONS
Battery charge temperature and charging status
are always monitored for each condition. Two
status-monitor output pins indicate the battery
charging status and input status. The MP2611
•
•
•
Smartphones
Portable Hand-Held Solutions
Portable Media Players
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
also
features
internal
reverse-blocking
protection.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
The MP2611 is available in a 3mm x 4mm
QFN14 package.
TYPICAL APPLICATION
AC Adapter
Input
C1
22uF
1
2.2uH
L
ACIN
RS1
50m
3
9
4
USB Port
USBIN
SW
CSP
C2
22uF
MP2611
R1 1.5k
8
2
C4
22uF battery
11
BATT
1-cell
STAT1
1.5k
R2
PGND
12
6
STAT2
10
7
ON
OFF
VREF33
NTC
EN
USBM
R3
C3
1uF
13
14
TMR
CTMR
0.1uF
RILIM
AGND
5
RNTC
MP2611 Rev. 1.12
12/7/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
ORDERING INFORMATION
Part Number*
Package
Top Marking
MP2611GL
QFN14 (3x4mm)
2611
* For Tape & Reel, add suffix –Z (eg. MP2611GL–Z);
PACKAGE REFERENCE
TOP VIEW
1
2
3
4
5
6
7
14
13
12
11
10
9
8
EXPOSED PAD
ON BACKSIDE
ABSOLUTE MAXIMUM RATINGS (1)
ACIN ........................................................... 7.5V
USBIN......................................................... 7.5V
SW..................................... -0.3V to (VIN + 0.3V)
CSP, BATT .......................................-0.3V to 6V
All the Other Pins..............................-0.3V to 6V
Thermal Resistance (4)
QFN14 (3mm x 4mm).............48...... 10... °C/W
θJA
θJC
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-to-
ambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
(2)
Continuous Power Dissipation (TA=25°C)
............................................................. 2.6W
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
Storage Temperature................. -65°C to 150°C
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions (3)
ACIN ..................................................4.5V to 6V
USBIN................................................4.5V to 6V
Operating Junction Temp. (TJ)..-40°C to +125°C
MP2611 Rev. 1.12
12/7/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
2
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
ELECTRICAL CHARACTERISTICS
VIN(5) = 5V, TA= 25°C, Unless Otherwise Noted.
Parameters
Symbol Condition
Min
Typ
Max
Units
AC Input
ACIN Operating Range
VACIN
VUVLO
4.5
5
6
V
V
ACIN Under Voltage Lockout (UVLO)
Rising Threshold
3.55
3.75
3.95
ACIN Under Voltage Lockout (UVLO)
Threshold Hysteresis
200
1.5
mV
Switching Frequency
fS
MHz
Constant Charger Current
High-side PFET On Resistance
Low-side NMOS On Resistance
High-side PFET Peak Current Limit
Dead Time
ICC
RS1=50mΩ
1.8
3
2
2.2
A
mΩ
mΩ
A
RH_DS(ON)
RL_DS(ON)
130
200
3.5
10
ns
2.0
20
mA
EN =0V, No load
EN =4V
Supply Current
IIN
μA
USB Input
USBIN Operating Range
VUSBIN
VUVLO
4.5
5
6
V
V
USBIN Under Voltage Lockout (UVLO)
Rising Threshold
3.55
3.75
3.95
USBIN Under Voltage Lockout (UVLO)
Threshold Hysteresis
200
450
mV
RILIM =82.5kꢀ,
VUSBIN = 5V, VBATT=4V
500
900
mA
mA
USB Input Current limit
IUSB_LIM
R
ILIM =45.3kꢀ,
810
110
VUSBIN = 5V, VBATT=4V
High-side PFET On Resistance
USB Supply Current
mꢀ
2.0
30
mA
EN =0V, No load
EN =4V, No load
μA
Battery Charger
Terminal Battery Voltage
Battery Over-Voltage Threshold
Recharge Threshold at VBATT
Recharge Hysteresis
VBATT_FULL VIN=5V
4.179
4.26
4.2
4.34
4.0
100
3
4.221
4.42
V
V
VBOVP
VIN=5V
VRECHG
V
mV
V
Trickle-Charge Threshold
Trickle-Charger Hysteresis
Trickle-Charge Current
Termination Charge Current
VTC
300
10
mV
%ICC
%ICC
ITC
IBF
15
15
5
10
Maximum Current-Sense Voltage (CSP
to BATT)
100
9
mV
mA
STAT1/STAT2 Open-Drain Sink Current
VDRAIN =0.3V
MP2611 Rev. 1.12
12/7/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
3
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
ELECTRICAL CHARACTERISTICS (continued)
VIN(5) = 5V, TA= 25°C, Unless Otherwise Noted.
Parameters
Symbol
Condition
VIN-VBATT
Min
Typ
Max
Units
mV
VIN Min Head-room (Reverse Blocking)
CSP, BATT Current
Protection
200
ICSP,IBATT
Charging Disabled
1
µA
Trickle-Charge Time
CTMR=0.1µF
CTMR=0.1µF
30
180
32
min
min
Total Charge Time
NTC High Temp. Rising Threshold
NTC Low Temp. Falling Threshold
Thermal Shutdown(6)
VTH_High RNTC=NCP18XH103,50°C
VTH_Low RNTC=NCP18XH103, 0°C
TSHTDWN
30
72
34
76
%VREF33
%VREF33
°C
74
150
EN Logic
0.8
V
V
EN Input Low Voltage
EN Input High Voltage
1.2
4
EN =4V
μA
EN Input Current
0.2
EN =0V
VREF33 Output Voltage
VREF33 Load Regulation
Notes:
VVREF33
∆VVREF33
3.23
3.3
0.2
3.37
V
V
ILOAD=0 to 20mA
5) VIN represents VACIN or VUSBIN which depends on the input mode. The following is the same.
6) Guaranteed by design..
MP2611 Rev. 1.12
12/7/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
4
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
TYPICAL CHARACTERISTICS
VIN=5V, C1=C2=22µF, C4=22µF, CTMR=0.1µF, L=1.5µH, RS1=50mΩ, RILIM=40.2kꢀ, Battery
Simulator, Unless Otherwise Noted.
BATT Voltage Accuracy
vs. Temperature
AC/USB Mode
Charge Current Accuracy
vs. Temperature
AC/USB Mode
USB Current Limit Accuracy
vs. Temperature
USB Mode, I
=500mA
USB_LIM
1.50
1.25
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
-1.25
-1.50
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-1.6
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-40-25 -10 5 20 35 50 65 80 95110125
-40-25-10 5 20 35 50 65 80 95110125
-40-25-10 5 20 35 50 65 80 95110125
VREF Accuracy vs.
Temperature
Quiescent Current vs.
Temperature
Shutdown Current vs.
Temperature
AC/USB Mode
V
=0V, AC/USB Mode
V
=4V (Disabled), AC/USB Mode
EN
EN
10
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
1.20
1.00
0.80
0.60
0.40
0.20
0.00
-0.20
-0.40
-0.60
-0.80
-1.00
-1.20
9
8
7
6
5
4
-40-25-10 5 20 35 50 65 80 95110125
-40-25-10 5 20 35 50 65 80 95110125
-40-25-10 5 20 35 50 65 80 95110125
MP2611 Rev. 1.12
12/7/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=5V, C1=C2=22µF, C4=22µF, CTMR=0.1µF, L=1.5µH, RS1=50mꢀ, RILIM=40.2kꢀ, Battery
Simulator, Unless Otherwise Noted.
Breakdown Voltage
Battery Reverse Current
Shutdown Current
AC/USB Mode
AC/USB Mode, V =PGND/Float
V
=4V (Disabled), AC/USB Mode
IN
EN
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
25
20
15
10
5
4000
3500
3000
2500
2000
1500
1000
500
0
0
0
1
2
3
4
5
6
7
8
9
1.5
2
2.5
3
3.5
4
4.5
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
INPUT VOLTAGE(V)
BATTERY VOTLAGE (V)
Charge Full Voltage
Charge Current Accuracy
vs. V
USBM Input Current
Limit Accuracy
USB Mode
Accuracy vs. V
IN
IN
AC/USB Mode
AC Mode
30
0.100
0.075
0.050
0.025
0.000
-0.025
-0.050
-0.075
-0.100
0.30
0.20
0.10
0.00
-0.10
-0.20
-0.30
25
20
15
10
5
0
-5
4.5
4.9
5.3
5.7
6.1
6.5
4.5
4.9
5.3
5.7
6.1
6.5
0
200 400
600 800
1000
I
SET POINT (mA)
INPUT VOLTAGE(V)
INPUT VOLTAGE(V)
USB_LIM
VREF33 Regulation Accuracy
RS1=50m, AC Mode
USBM Input Current Limit
Case Temperature vs.
Battery Voltage
vs. 1000/R
ILIM
USB Mode
RS1=50m, AC Mode
100
80
60
40
20
0
1000
900
800
700
600
500
400
300
200
100
0
0.20
0.15
0.10
0.05
0.00
-0.05
-0.10
-0.15
-0.20
-0.25
-0.30
-0.35
-0.40
-0.45
-0.50
Battery Float
V
=3.7V
BATT
4.5
5.0
5.5
6.0
6.5
0
5
10
15
20
25
3.0 3.2 3.4 3.6 3.8 4.0 4.2
BATTERY VOLTAGE (V)
INPUT VOLTAGE(V)
MP2611 Rev. 1.12
12/7/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
6
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=5V, C1=C2=22µF, C4=22µF, CTMR=0.1µF, L=1.5µH, RS1=50mꢀ, RILIM=40.2kꢀ, Battery
Simulator, Unless Otherwise Noted.
AC Mode Charge Curve
USB Mode Charge Curve
USB Mode Charge Curve
1.6
1.4
1.2
1
3
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
V
=5.5V
USBIN
2.5
2
I
=2A
V
=4.5V
ACIN
USB_LIM
V
=5V
USBIN
I
=1.5A
0.8
0.6
0.4
0.2
0
1.5 USB_LIM
V
=5V
ACIN
V
=4.5V
USBIN
1
I
=1A
USB_LIM
0.5
0
I
=0.5A
USB_LIM
1.6 1.9 2.2 2.5 2.8 3.1 3.4 3.74.0 4.3
BATTERY VOLTAGE(V)
1.6 1.9 2.2 2.5 2.8 3.1 3.4 3.7 4.0 4.3
1.6 1.9 2.2 2.5 2.8 3.1 3.4 3.7 4.0 4.3
BATTERY VOLTAGE(V)
BATTERY VOLTAGE (V)
Frequency vs. Battery
Voltage
Frequency vs. Battery
Voltage
AC Mode Efficiency in
TC/CC Charge
AC Mode
USB Mode
1800
1600
1400
1200
1000
800
600
400
200
0
1800
1600
1400
1200
1000
800
600
400
200
0
100
V
>5V
USBIN
V
=6V
ACIN
95
90
85
80
75
70
65
60
55
50
V
=4.5V
ACIN
V
=5V
ACIN
V
=6V
ACIN
V
=5V
V
=4.5V
ACIN
USBIN
V
=4.5V
ACIN
1
1.4 1.8 2.2 2.6 3.0 3.4 3.8 4.2
BATTERY VOLTAGE(V)
1
1.4 1.8 2.2 2.6 3.0 3.4 3.8 4.2
BATTERY VOLTAGE (V)
1.0 1.4 1.8 2.2 2.6 3.0 3.4 3.8 4.2
BATTERY VOLTAGE (V)
AC Mode Efficiency in
CV Charge
USB Mode Efficiency
VREF Startup Waveform
V
=3.7V, En On
BATT
100
95
90
85
80
75
70
65
60
55
50
100
95
90
85
80
75
70
65
60
55
50
V
=4.5V
ACIN
V
=4.5V
USBIN
V
EN
200mV/div.
V
=5V
V
ACIN
V
=5.5V
USBIN
=6V
V
ACIN
REF33
2V/div.
V
=5V
USBIN
STAT2
2V/div.
STAT1
2V/div.
400
800
1200
1600
2000
1.0 1.4 1.8 2.2 2.6 3.0 3.4 3.8 4.2
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)
MP2611 Rev. 1.12
12/7/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
7
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=5V, C1=C2=22µF, C4=22µF, CTMR=0.1µF, L=1.5µH, RS1=50mꢀ, RILIM=40.2kꢀ, Battery
Simulator, Unless Otherwise Noted.
BATT Float Waveform
Low Input Voltage
Charge State
Low Input Voltage
Charge State
USB/AC Mode
AC Mode, V
=4.5V, V
=3.8V
AC Mode, V
=4.5V, V =4V
BATT
ACIN
BATT
ACIN
V
IN
V
ACIN
1V/div.
V
ACIN
2V/div.
1V/div.
V
BATT
V
V
BATT
BATT
1V/div.
1V/div.
1V/div.
V
V
SW
SW
2V/div.
2V/div.
V
SW
2V/div.
I
I
L
L
1A/div.
1A/div.
I
L
500mA/div.
Low Input Voltage
Charge State
Low Input Voltage
Charge State
TC Charge Steady State
AC/USB Mode, V
=1.5V
BATT
AC Mode, V
=4.5V, V
=4.02V
AC Mode, V
=4.5V, V
=4.18V
ACIN
BATT
ACIN BATT
V
V
V
ACIN
ACIN
IN
1V/div.
1V/div.
2V/div.
V
V
V
BATT
BATT
BATT
1V/div.
1V/div.
500mV/div.
V
V
SW
SW
2V/div.
2V/div.
V
SW
2V/div.
I
L
I
L
1A/div.
1A/div.
I
L
500mA/div.
CC Charge Steady State
CC Charge Steady State
CV Charge Steady State
AC Mode, V
=5V, V
=3.8V
USB Mode, V
=5V, V
=3.8V
AC / USB Mode, V =4.2V
BATT
ACIN BATT
USBIN BATT
V
V
V
IN
2V/div.
ACIN
ACIN
2V/div.
1V/div.
V
V
V
BATT
BATT
BATT
1V/div.
1V/div.
1V/div.
V
SW
2V/div.
I
L
500mA/div.
V
V
SW
SW
2V/div.
2V/div.
I
I
L
L
500mA/div.
200mA/div.
MP2611 Rev. 1.12
12/7/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
8
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=5V, C1=C2=22µF, C4=22µF, CTMR=0.1µF, L=1.5µH, RS1=50mꢀ, RILIM=40.2kꢀ, Battery
Simulator, Unless Otherwise Noted.
Power On
Power Off
En On
AC Mode, V
=3.8V
BATT
AC Mode, V
=3.8V
BATT
AC Mode, V
3.8V
BATT=
V
ACIN
2V/div.
V
BATT
V
2V/div.
EN
2V/div.
V
BATT
V
1V/div.
ACIN
V
BATT
2V/div.
1V/div.
V
V
V
SW
SW
SW
2V/div.
5V/div.
5V/div.
I
I
I
CHG
CHG
CHG
1A/div.
1A/div.
1A/div.
En Off
AC Adapter Insertion
AC Adapter Removal
AC Mode, V
=3.8V
BATT
V
=6V, V
USBIN
=4.5V, V
=4.1V
V
=6V, V
=4.5V, V =4.1V
BATT
ACIN
BATT
ACIN USBIN
V
ACIN
1V/div.
V
USBIN
V
USBIN
1V/div.
1V/div.
V
EN
V
V
BATT
BATT
2V/div.
1V/div.
1V/div.
V
BATT
1V/div.
V
SW
5V/div.
V
ACIN
1V/div.
I
CHG
I
I
CHG
CHG
1A/div.
1A/div.
1A/div.
NTC Control
Timer Out
Short-Circuit Protection
V
=3.7V
BATT
CTMR=150pF, V =3.7V
BATT
V
IN
2V/div.
V
V
TMR
BATT
1V/div.
2V/div.
V
NTC
STAT2
2V/div.
2V/div.
V
BATT
1V/div.
V
SW
STAT1
2V/div.
V
5V/div.
SW
5V/div.
I
L
I
CHG
I
1A/div.
CHG
1A/div.
1A/div.
MP2611 Rev. 1.12
12/7/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
9
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
PIN FUNCTIONS
Package
Pin #
Name Description
AC Adapter Power Input. Bypass ACIN to PGND with at least a 4.7μF ceramic capacitor
when the pin is not applied for powering.
1
ACIN
Power Ground. Voltage reference for the regulated output voltage: Take extra care with
its layout. Place this node should be placed outside of the switching diode (SW-pin) to the
input ground path to prevent switching current spikes from inducing voltage noise into the
part.
2
PGND
3
4
SW
Switch Output. Connect to the switched side of the external inductor.
USB Power Input. Bypass USBIN to PGND with at least a 4.7μF ceramic capacitor when
the pin is not applied for powering.
USBIN
5
6
AGND Analog Ground.
VREF33 Internal Linear Regulator Reference Output. Powered from ACIN or USBIN.
USB Input Current-Limit Set. Connect a resistor from this pin to AGND to program the
USB mode input current limit.
7
8
9
USBM
BATT
CSP
Positive Battery Terminal.
Battery Current Sense Positive Input. Connect resistor RS1 between CSP and BATT to
sense the charge current.
10
11
12
On/Off Control Input.
EN
STAT1
STAT2
Charging Status Indicator: 1. Charging; 2. End of charge; 3. Charging Suspended;
4. Fault; 5. Invalid Input Supply.
Thermistor Input. Connect a resistor from this pin to the VREF33 and the thermistor from
this pin to AGND.
13
14
NTC
TMR
Internal Safety Timer Control. Connect a capacitor from this node to AGND to set the
timer. And the timer can be disabled by connecting this pin to AGND.
MP2611 Rev. 1.12
12/7/2012
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MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
BLOCK DIAGRAM
Figure 1: Functional Block Diagram
MP2611 Rev. 1.12
12/7/2012
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MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
ACIN and USBIN Detection
OPERATION
There are two separate battery charger inputs;
ACIN for the AC adapter, and USBIN for the USB
port.
The MP2611 is a monolithic switching charger
with built-in power MOSFETs for a single-cell Li-
Ion battery pack. It achieves up to a 2A charge
current that can be programmed through an
accurate sense resistor over the whole input
range. It can operate with separate inputs for
USB and AC adapter: For USB mode, the input
current limit can be programmed to 500mA and
900mA via the USBM-pin for both USB2.0 and
USB3.0.
ACIN is used as the battery-charger primary
power supply. As soon as the ACIN voltage
exceeds ACIN UVLO (3.75V), Q1 turns on and
Q2 turns off. The adapter charges the battery
with up to 2A constant charge current through the
step-down DC/DC converter implemented by Q1
and Q3. The charge current can be set by RS1.
Charge Cycle (Trickle ChargeÆ CC ChargeÆ
CV Charge)
If the ACIN input is absent or less than 3.75V, the
USBIN can act as the power supply for the
battery charger: Q1 turns off and Q2 turns on.
USB supply mode uses the input current limit
loop so that the threshold can be programmed by
connecting a resistor RILIM from the USBM-pin to
AGND.
The MP2611 regulates the charge current (ICHG
)
and battery voltage (VBATT) using two control
loops to realize highly-accurate constant current
(CC) charge and constant voltage (CV) charge.
The device uses the resistor RS1 to sense the
battery charge current and amplifies the signal
using the internal amplifier A3 (Figure 1). The
charge starts in trickle-charge mode (TC, 10% of
the constant current ICC) until the battery voltage
reaches 3V. If the charger stays in the trickle-
charge mode until it triggers a time-out condition,
the charging terminates. Otherwise, the charger
operates in constant-current charging mode. The
COMPI voltage, regulated by the amplifier GMI,
determines the duty cycle.
When ACIN and USBIN are both absent, Q1 and
Q2 are completely off and the reverse blocking
function blocks the battery reverse-leakage
current to the input port.
Note that if ACIN and USBIN are both present,
the device selects the AC adapter as the power
supply of the charger. However, avoid this
practice.
DC/DC Converter
The MP2611 integrates both the high-side switch
and the synchronous low-side switch, which
provides high efficiency and eliminates the
external Schottky diode.
When the battery voltage rises to the constant-
voltage mode threshold, the amplifier GMV
regulates the COMP-pin and the duty cycle.
Consequently, the charger operates in constant-
voltage mode.
During normal operation, the high-side switch
turns on for a period of time to ramp-up the
inductor current at each rising edge of the
internal oscillator, and switches off when the
peak inductor current rises above the COMP
voltage. Once the high-side switch turns off, the
synchronous switch turns on immediately and
stays on until the next cycle starts (see Figure 1).
The device allows the high-side switch to remain
on for more than one switching cycle and
increases the duty cycle while the input voltage
drops close to the output voltage. When the duty
cycle reaches 100%, the high-side switch is held
on continuously to deliver current to the output.
Figure 2: Li-Ion Battery Charge Profile
MP2611 Rev. 1.12
12/7/2012
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MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
Charge-Full Termination and Auto-Recharge
The charger can exit the timer-out fault state and
initiates a new charge cycle when one of the
following conditions occurs:
When the charge current drops below the
termination threshold (IBF) during the CV charge
phase, the charger ceases charging and the
(a) The battery voltage falls below the auto-
-pin becomes an open drain. The timer
STAT1
recharge threshold VRECHG
;
will also be reset and turned off. If the battery
voltage falls below 4.0V, auto-recharge begins
and the timer restarts a new charge cycle.
(b) A power-on-reset (POR) event occurs;
(c) EN is toggled.
Charger Status Indication
Negative Thermal Coefficient (NTC)
Thermistor
and
are two open-drain NMOS
STAT2
STAT1
The MP2611 has a built-in NTC window
comparator that allows it to sense the battery
temperature via the thermistor packed internally
in the battery. It ensures a safe battery operating
environment. Connect an appropriately-valued
resistor from VREF33 to the NTC-pin and
connect the thermistor from the NTC-pin to
AGND. The resistor divider with a dividing ratio
depends on the battery temperature determins
the voltage on the NTC-pin. Once the voltage at
the NTC-pin is out of the NTC window, the
MP2611 stops charging. The charger restarts if
the voltage re-enters the NTC window range.
outputs that must connect to the VREF33 output
or some other bias power supply through pull-up
resistors. Their output logic level combinations
indicate three status of the charger:
Table 1: Charging Status Indicator
Charger Status
Charging
STAT2
Low
STAT1
Low
End of Charge; Faults
(Thermal Shutdown;
Time-Out; NTC Fault)
Input Power Absent;
VIN-VBATT<0.2V;
Low
High
High
High
Disabled
EN
Short Circuit Protection
The MP2611 has an internal comparator to check
for battery short circuit. Once VBATT falls below 2V,
the device detects a battery-short status and the
cycle-by-cycle peak current limit falls to about 2A
to limit the current spike during the battery-short
transition. Furthermore, the switching frequency
also folds back to minimize the power loss.
Safety Timer Operation
The MP2611 adopts an internal timer to
terminate charging if the timer times out. An
external capacitor on the TMR-pin programs the
timer duration.
The trickle mode charge time is:
CTMR
Thermal Shutdown Protection
tTrickle_tmr = 30×
(minutes)
0.1μF
To prevent the chip from overheating during
charging, the MP2611 monitors the junction
temperature, TJ, of the die. Once TJ reaches the
thermal shutdown threshold (TSHTDWN) of 150°C,
the charger converter turns off. Charging restarts
when TJ falls below 130°C.
The total charge time is:
CTMR
tTotal_tmr =3×
(hours)
0.1μF
Where CTMR is the capacitor connected from
TMR-pin to GND. The timer can be disabled by
pulling TMR to GND.
If a timer-out event occurs, the charging will be
terminated and the STAT1 will become an open
drain to indicate the fault.
MP2611 Rev. 1.12
12/7/2012
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MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
BATTERY CHARGE TIMING DIAGRAM
Figure 3: Battery Charge Timing Diagram
Note:
7) The
and
are pulled up to VREF33 with an 1kꢀ resistor respectively.
STAT2
STAT1
MP2611 Rev. 1.12
12/7/2012
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MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
OPERATION FLOW CHART
Figure 4: Normal Charging Operation and Fault Protection Flow Chart
MP2611 Rev. 1.12
12/7/2012
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MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
APPLICATION INFORMATION
Where VTC is trickle charge threshold (3V) and η
Setting the Charge Current in AC Mode
is the current charge efficiency. Assume
In AC mode, RS1 sets the charge current (ICHG
)
VUSBIN=5.5V, IUSB_LIM=1.5A , η =83%, thus
of the MP2611 (see Typical Application). The
equation to determine the programmable CC-
charge is as follows:
I
CC_MAX= 2.28A.
100mV
(1)
ICC
=
(A)
RS1(mΩ)
Assume ICC=2A, thus: RS1=50mꢀ.
For either AC mode or USB mode, the trickle
charge current is given by the following equation:
10mV
(2)
ITC =10%ICC
=
(A)
RS1(mΩ)
Setting the USB Input Current Limit
In USB supply mode, connect a resistor from the
USBM pin to AGND to program the input current
limit for different USB ports. The relationship
between the input current limit and setting
resistor is as following:
Figure 5: ICHG Variation with VUSBIN=5.5V
For certain battery packs, the CC charge current
should never go too high so set the IUSB_LIM based
on the ICC_MAX
.
Selecting the Inductor
37000
IUSB_LIM
=
(mA)
(3)
Inductor selection trades off between cost, size,
RILIM(kΩ)
and efficiency.
A
lower inductance value
Where RILIM is greater than 18.5kꢀ so that IUSB_LIM
is in the range of 0A to 2A. If using a resistor
smaller than 18.5kꢀ, the MP2611 suppresses
IUSB_LIM to a value less than 2A. For most
applications, use a 45.3kꢀ RILIM (IUSB_LIM=900mA)
for USB3.0 mode, and use a 82.5kꢀ RILIM
(IUSB_LIM=500mA) for USB2.0 mode.
corresponds with smaller size, but results in
higher ripple currents, higher magnetic hysteretic
losses, and higher output capacitances. However,
a higher inductance value benefits from lower
ripple current and smaller output filter capacitors,
but results in higher inductor DC resistance (DCR)
loss. From a practical standpoint, the inductor
ripple current does not exceed 15% of the
maximum charge current under worst cases. For
a MP2611 with a typical 5V input voltage, the
maximum inductor current ripple occurs at the
corner point between trickle charge and CC
charge (VBATT=3V). Estimate the required
inductance as:
Note that in USB mode, the MP2611 doesn’t
monitor the charge current through RS1 during
CC charge phase, but regulates the input current
constant at the limitation value IUSB_LIM. Thus the
CC charge current varies with different input and
battery voltages. Figure 5 shows the charge
current vs. battery voltage curve when
V
USBIN=5.5V.
V - VBATT VBATT
IN
(5)
L =
The maximum CC charge value can be
calculated as:
ΔIL_MAX V ⋅ fS
IN
Where VIN, VBATT, and fS are the typical input
voltage, the CC charge threshold, and the
switching frequency, respectively. ΔIL_MAX is the
VUSBIN ⋅IUSB_LIM ⋅η
(4)
ICC_MAX
=
(A)
VTC
maximum inductor ripple current ,which is usually
15% of the CC charge current.
MP2611 Rev. 1.12
12/7/2012
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MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
ΔIL_MAX =15%ICC
(6)
Selecting the Input Capacitor
The input capacitors C1/C2 from the typical
application circuit absorbs the maximum ripple
current from the buck converter, which is given
by:
For ICC=2A, VIN=5V, VBATT=3V and fs=1.5MHz, the
calculated inductance is 2.66µH. The maximum
inductor peak current must exceed 2.3A. To
optimize efficiency, chose an inductor with a DC
resistance less than 50mꢀ. Choose the inductor
7447745022 from Wurth Corporation with ratings
at L=2.2µH/3.5A /36mꢀ.
VTC (V
− VTC )
IN_MAX
IRMS_MAX = ICC_MAX
(9)
V
IN_MAX
NTC Function
For ICC_MAX=2A, VTC=3V, VIN_MAX=6V, the
maximum ripple current is 1A. Select the input
capacitors so that the temperature rise due to the
ripple current does not exceed 10°C. Use
ceramic capacitors with X5R or X7R dielectrics
because of their low ESR and small temperature
coefficients. For most applications, use a 22µF
capacitor.
Figure 6 shows that an internal resistor divider
sets the low temperature threshold and high
temperature threshold at 74%·VREF33 and
32%·VREF33, respectively. For a given NTC
thermistor, select appropriate RT1 and RT2 to set
the NTC window.
The thermistor (NCP18XH103) noted above has
the following electrical characteristic:
Selecting the Output Capacitor
The output capacitor—C4 from the typical
application circuit—is in parallel with the battery.
C4 absorbs the high-frequency switching ripple
current and smoothes the output voltage. Its
impedance must be much less than that of the
battery to ensure it absorbs the ripple current.
Use a ceramic capacitor because it has lower
ESR and smaller size that allows us to ignore the
ESR of the output capacitor. Thus, the output
voltage ripple is given by:
At 0°C, RNTC_Cold = 27.445kꢀ;
At 50°C, RNTC_Hot = 4.1601kꢀ.
The following equations are derived assuming
that the NTC window is between 0°C and 50°C:
RT2//RNTC_Cold
RT1 +RT2//RNTC_Cold VREF33
RT2//RNTC_Hot
VTH_High
RT1 +RT2//RNTC_Hot VREF33
VTH_Low
(7)
=
= 74%
(8)
=
= 32%
VO
1-
According to equation (7) and equation (8), \RT1=
8.7kꢀ and RT2 = 252.3kꢀ. Simplified for
applications, RT1=8.7kꢀ and RT2 = No Connect
approximates the values.
ΔVO
VO
V
IN
(10)
ΔrO =
=
2
8COfS L
In order to guarantee the ±0.5% battery voltage
accuracy, the maximum output voltage ripple
must not exceed 0.5% (e.g. 0.1%). The maximum
output voltage ripple occurs at the minimum
battery voltage of the CC charge and the
maximum input voltage.
For
VIN_MAX=6V, VCC_MIN=VTC=3V, L=1.5µH,
f =1.5MHz,
S
, the output capacitor
ΔrO_MAX = 0.1%
can be calculated as:
VTC
1-
V
IN_MAX
CO =
=18.5μF
(11)
2
8fS LΔrO_MAX
Figure 6: NTC Function Block
We can then choose a 22µF ceramic capacitor.
MP2611 Rev. 1.12
12/7/2012
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MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
PCB Layout Guide
PCB layout is important to meet specified noise,
efficiency and stability requirements. The
following design considerations can improve
circuit performance:
1) Route the power stage adjacent to their
grounds. Aim to minimize the high-side
switching node (SW, inductor), trace lengths
in the high-current paths and the current-
sense resistor trace. Keep the switching
node short and away from the feedback
network.
2) The exposed thermal pad on the backside of
the MP2611 package must be soldered to
the PGND plane. There must be sufficient
thermal vias underneath the IC connected to
the ground plane on the other layers.
3) Connect the charge current sense resistor to
CSP (pin 9), BATT (pin 8) with a Kelvin
contact. Minimize the length and area of this
circuit loop.
4) Place the input capacitor as close as
possible to the ACIN/USBIN and PGND pins.
Place the output inductor close to the IC as
and connect the output capacitor between
the inductor and PGND of the IC. This
minimizes the current path loop area from
the SW pin through the LC filter and back to
the PGND pin.
5) Connect AGND and PGND at a single point.
MP2611 Rev. 1.12
12/7/2012
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MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
TYPICAL APPLICATION CIRCUITS
Power-Path Management
resistor. While the battery voltage is less than the
preset threshold (less than VTC of 3V), the
MOSFET Q1 turns off. The 5ꢀ resistor, RP, is
then in series with the battery to raise the system
voltage to 1V (ITC=0.2A assumed). As a result,
the system can also operate at low battery
voltage. While the battery voltage is high enough,
Q1 turns on to short though the RP resistor to
reduce power loss.
Power-path applications require powering the
system while simultaneously charging the battery.
Traditional designs adopt the simplest battery-fed
topology that connects the system to the battery
directly. An obvious drawback is that it cannot
operate the system with a drained battery.
Figure 7 shows an improved battery-fed topology.
The additional circuit between the current sense
resistor and the battery works like a variable
Figure 7: Improved Battery-Fed Power-Path Management Structure
The power-path auto-selection topology shown in
Figure 8 adopts external switches to decouple
the system supply and battery charging process.
Thus the adapter directly powers the system
independent of the battery’s state as long as the
adapter is plugged in. If the adapter is absent,
the battery supplements the system.
Replace M1 and M2 with a power diode each, to
reduce the costs. However, the efficiency may
decline due to the forward voltage drop of the
diode. Even USBIN is not used, a least 4.7μF
capacitor is necessary connecting the pin to GND.
Figure 8: Power-Path Auto-Selection Structure
MP2611 Rev. 1.12
12/7/2012
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19
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
Single Input Port Application
For some portable devices, only one input port
that covers both AC adapter and USB port is
adopted. The charger is then required to identify
the input source (AC adapter or USB port) via an
external logic signal from MODE-pin. MODE-pin
pulled high indicates an AC adapter is connected,
low indicates an USB port source.
Figure 9 shows a single input port application
circuit. The MOSFET M1 is used to alter the input
source. High-level voltage at MODE-pin turns on
the M1 and the charger is then switched from
USB input mode to AC input mode. The capacitor
C5 and R5 are necessary to realize the soft-start
of voltage at ACIN, increase the value if the
recommended value in Figure 9 does not work.
Figure 9: Single Input Port Application Circuit –1
Figure 10 shows another single input port
application circuit. For the AC adapter input, the
high-level signal at MODE-pin turns on the M1 to
connect the parallel resistor R4 at USBM-pin.
Due to the increased input current limitation,
charge current is enlarged. Please refer to the
USB input current setting and choose the
appropriate resistor based on the actual battery
specification. R8 and C5 are necessary for soft
tuning on and off of M1 to avoid unexpected
USBM reference caused by noise.
In addition, a least 4.7μF ceramic capacitor
connected between ACIN-pin to PGND is
necessary to avoid noise interference.
Input Port
C2
4
22uF
USBIN
2.2uH
RS1
L
1
3
ACIN
SW
C1
50m
9
8
2
CSP
4.7uF
C4
MP2611
1-cell
battery
BATT
1.5k
1.5k
22uF
R1
R2
11
STAT1
PGND
12
6
10
7
STAT2
ON
OFF
EN
R4
VREF33
USBM
C3
1uF
R3
R8
C5
20
14
M1
2N7002
RILIM
13
MODE
TMR
NTC
CTMR
0.1uF
R7
200k
USB
AC
AGND
5
RNTC
1uF
Figure 10: Single Input Port Application Circuit –2
MP2611 Rev. 1.12
12/7/2012
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20
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
Input OVP Application
For MP2611, the maximum rating of input voltage
is only 7.5V. In order to prevent an unmatched
adapter from being connected to damage this
part, the input over-voltage protection (OVP) is
required. Figure 11 shows the application circuit
for the input OVP, where the OVP threshold can
be programmed via the resistor divider consist of
R4 and R5. For the given parameters below, the
OVP threshold is 6.2V and maximum input rating
is extended to 18V (Limited by the TLVH431).
Figure 11: AC Input Mode with Input OVP
MP2611 Rev. 1.12
12/7/2012
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21
MP2611 – 2A, 1-CELL SWITCHING CHARGER FOR USB AND ADAPTER POWER
PACKAGE INFORMATION
QFN 14 (3mm x 4mm)
1.60
1.80
2.90
3.10
0.30
0.50
PIN 1 ID
SEE DETAIL A
PIN 1 ID
MARKING
1
14
0.18
0.30
3.20
3.40
3.90
4.10
PIN 1 ID
INDEX AREA
0.50
BSC
7
8
TOP VIEW
BOTTOM VIEW
PIN 1 ID OPTION A
0.30x45º TYP.
PIN 1 ID OPTION B
R0.20 TYP.
0.80
1.00
0.20 REF
0.00
0.05
SIDE VIEW
DETAIL A
2.90
1.70
NOTE:
0.70
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX.
4) DRAWING CONFORMS TO JEDEC MO-229, VARIATION VEED-5.
5) DRAWING IS NOT TO SCALE.
0.25
0.50
3.30
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP2611 Rev. 1.12
12/7/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
22
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