MP2612
2A,24V Input, 600kHz
2-3 Cells Switching Li-Ion Battery Charger
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP2612 is a monolithic switching charger
for 2-3 cells series Li-Ion cells battery with a
built-in internal power MOSFET. It achieves up
to 2A charge current with current mode control
for fast loop response and easy compensation.
The charge current can be programmed by
sensing the current through an accurate sense
resistor.
MP2612 regulates the charge current and
charge voltage using two control loops to
realize high accuracy CC charge and CV
charge.
Fault condition protection includes cycle- bycycle current limiting and thermal shutdown.
Other safety features include battery temperature
monitoring, charge status indication and
programmable timer to finish the charging cycle.
The MP2612 requires a minimum number of
readily available standard external components.
The MP2612 is available in 16-pin 4mm x 4mm
QFN package.
Charges 2-3 Cells Series Li-Ion Battery
Packs
Wide Operating Input Range
Up to 2 A Programmable Charging Current
±0.75% VBATT Accuracy
0.2Ω Internal Power MOSFET Switch
Up to 90% Efficiency
Fixed 600kHz Frequency
Preconditioning for Fully Depleted Batteries
Charging Operation Indicator
Input Supply and Battery Fault Indicator
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Battery Temperature Monitor and Protection
APPLICATIONS
Distributed Power Systems
Chargers for 2-Cell or 3-Cell Li-Ion Batteries
Pre-Regulator for Linear Regulators
Smart Phones
Net-book
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“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Figure 1—Standalone Switching Charger
MP2612 Rev. 1.0
3/9/2020
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1
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
D1
VIN
RS2
9V to 24V
(9V min for 2-cell)
VSYS
20m
RG2
RG1
M2
C8
22uF
RG1
VCC
RG2
MP8110
NC
SHDN
OUT2
GND
OUT1
M3
C1
4.7uF
L
VIN
VREF33
SW
VREF25
BST
C3
1uF
R1
R2
MP2612
ACOK
CELLS
10k
EN
ON OFF
100m
C2
D2
2-3 cells
battery
CSP
BATT
R5
750
R4
2.5k
COMPI
COMPV
NTC
RNTC
C7
0.1uF
22uF
CHGOK
R3
10k
RS1
4.7uH
GND
TMR
C6
C4
0.1uF
2.2nF
C5
2.2nF
Figure 2—Switching Charger with Power Path Management (1)
Notes:
1) ACOK should be pulled up to VIN in the power path management application.
MP2612 Rev. 1.0
3/9/2020
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2
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
ORDERING INFORMATION
Part Number*
MP2612ER
Package
4mm x 4mm QFN16
Top Marking
2612ER
Free Air Temperature (TA)
-20C to +85C
*For Tape & Reel, add suffix –Z (eg. MP2612ER–Z);
For RoHS compliant packaging, add suffix –LF (eg. MP MP2612ER–LF–Z)
PACKAGE REFERENCE
TOP VIEW
VIN
SW
BST
TMR
PIN 1 ID
16
15
14
13
ACOK
2
11
CSP
CHGOK
3
10
BATT
VREF33
4
9
COMPI
EXPOSED PAD
ON BACKSIDE
5
6
7
8
COMPV
GND
CELLS
12
EN
1
VREF25
NTC
ABSOLUTE MAXIMUM RATINGS (2)
Thermal Resistance (5)
Supply Voltage VIN ........................................ 26V
VSW ........................................ -0.3V to VIN + 0.3V
VBST........................................................ VSW + 6V
VCSP, VBATT, ................................... -0.3V to +18V
VACOK, VCHGOK, .............................. -0.3V to +26V
All Other Pins .................................. -0.3V to +6V
Continuous Power Dissipation (TA=+25C) (3)
............................................................... 2.7W
Junction Temperature ............................... 150C
Lead Temperature .................................... 260C
Storage Temperature ................-65C to +150C
4x4 QFN16 .............................. 46 ....... 10 ... C/W
Recommended Operating Conditions (4)
θJA
θJC
Notes:
2) Exceeding these ratings may damage the device.
3) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ(MAX), the junction-toambient 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.
4) The device is not guaranteed to function outside of its
operating conditions.
5) Measured on JESD51-7 4-layer board.
Supply Voltage VIN .............................. 9V to 24V
Maximum Junction Temp. (TJ) .............. +125C
MP2612 Rev. 1.0
3/9/2020
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3
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICS (6)
VIN = 19V, TA = +25C, CELLS=0V, unless otherwise noted.
Parameters
Symbol Condition
Terminal Battery Voltage
VBATT
CSP，BATT Current
CELLS=0V
CELLS= VREF33
Min
Typ
Max
Units
8.337
12.505
8.4
12.6
8.463
12.695
V
ICSP,IBATT Charging disabled
Switch On Resistance
RDS(ON)
Switch Leakage
CC current
0.2
Ω
10
μA
CC(6)
4.1
A
Trickle
2
A
ICC
Trickle charge current
µA
0
EN = 4V, VSW = 0V
Peak Current Limit
1
RS1=100mΩ
1.8
ITRICKLE
2.0
2.2
A
10%
ICC
Trickle charge voltage threshold
2.8
V/cell
Trickle charge hysteresis
350
mV
Termination current threshold
Oscillator Frequency
IBF
fSW
Fold-back Frequency
Maximum Duty Cycle
Maximum current Sense Voltage
(CSP to BATT)
Minimum On Time (6)
10%
VSENSE
Under Voltage Lockout Threshold
Rising
Under Voltage Lockout Threshold
Hysteresis
Open-drain sink current
170
CELLS=0V, VBATT =5V
kHz
190
kHz
%
200
Termination delay
3.2
VRECHG
mV
min
1
min
4.0
100
V/cell
mV
%VREF3
3
%VREF3
3
NTC High Temp Falling Threshold
RNTC=NCP18XH103(50°C)
30
VIN min
blocking)
VIN-VBATT
180
mV
0.4
EN Input Low Voltage
MP2612 Rev. 1.0
3/9/2020
V
30
73
EN Input Current
3.4
mA
RNTC=NCP18XH103(0°C)
1.8
EN Input High Voltage
mV
ns
5
NTC Low Temp Rising Threshold
(reverse
230
200
VDRAIN =0.3V
Stay at trickle mode
CTMR=0.1μF
Time after IBF reached,
CTMR=0.1μF
ICC
600
100
3
Dead-battery indication
head-room
15%
90
tON
Recharge threshold at VBATT
Recharge Hysteresis
5%
CELLS=0V,
VBATT =4.5V
VBATT =0V
V
V
EN =4V
4
EN =0V
0.2
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μA
4
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 19V, TA = +25C, CELLS=0V, unless otherwise noted.
Parameters
Symbol Condition
Supply Current (Shutdown)
Supply Current (Quiescent)
Thermal Shutdown
VREF25 output voltage
VREF33 output voltage
VREF33 load regulation
Min
Typ
Max
Units
EN =4V
0.16
mA
EN =4V,
Consider
VREF33
pin output current,
R3=10k,RNTC=10k
0.32
mA
2.0
EN =0V, CELLS=0V
(6)
ILOAD =0 to 10mA
150
2.5
3.3
30
mA
°C
V
V
mV
Notes:
6) Guaranteed by design.
MP2612 Rev. 1.0
3/9/2020
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© 2020 MPS. All Rights Reserved.
5
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=19V, C1=4.7μF, C2=22μF, L=4.7μH, RS1=100mΩ, Real Battery Load, TA=25ºC, unless
otherwise noted.
2
VBATT
8.2
8.1
1.5
8
7.9
1
7.8
IBATT
7.7
0.5
7.6
0
20
40
60
80
C HAR G E C UR R E NT (A)
8.3
CV Load
1. 5
1
VIN=12V
2
4
6
8
12.6
2
12.2
1.5
12
11.8
1
11.6
IBATT
11.4
0.5
11.2
11
10
VBATT
12.4
0
50
B AT T E R Y V OL T AG E (V )
3 Cells Charge Current vs.
Battery Voltage
0
150
100
T IME S (MIN)
NTC Control Window
CV Load
3
Low Temp Off
2.5
2
VIN=24V
1.5
2.5
1
2
Low Temp On
2
ICHG(A)
VIN=19V
VNTC(V)
C HA R G E C U R R E NT(A )
VIN=19V
VIN=24V
0. 5
T IME S (MIN)
2.5
2.5
12.8
2
0
0
0
100 120
3 Cells Battery Charge Curve
B A T T E R Y C UR R E NT (A )
8.4
7.5
2. 5
2.5
B A T T E R Y C UR R E NT (A )
B A T T E R Y V O L T A G E (V )
8.5
2 Cells Charge Current vs.
Battery Voltage
B A T T E R Y V O L T A G E (V )
2 Cells Battery Charge Curve
1.5
High Temp On
1.5
1
1
High Temp Off
0.5
0
0
0.5
0.5
2
4
6
8
10
12
B ATTER Y V OL TAGE(V )
MP2612 Rev. 1.0
3/9/2020
14
0
0
8
12
16
20
VIN(V)
24
28
0
0.5
1
1.5
2
2.5
ISYS(A)
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6
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=19V, C1=4.7μF, C2=22μF, L=4.7μH, RS1=100mΩ, Real Battery Load, TA=25ºC, unless
otherwise noted.
Efficiency vs. ICHG
Efficiency vs. ICHG
Efficiency vs. VIN
2 Cells, VBATT=8.4V
3 Cells, VBATT=12.6V
2 Cells, VBATT=7.4V
100
90
VIN=19V
VIN=24V
80
VIN=15V
VIN=15V
EFFICIENCY (%)
EFFICIENCY (%)
VIN=12V
70
60
92
90
VIN=24V
80
70
0.4
0.8
1.2
1.6
2
89
86
83
80
60
0
0
0.4
0.8
ICHG(A)
1.2
1.6
5
2
2 Cells
8.4
8.4
2
8.2
8.1
VBATT (V)
2.2
VBATT (V)
8.5
8.3
8.3
8.2
18
23
28
8
-20
25
2 Cells, VBATT=7.4V
1.8
1.6
1.4
8.1
8
20
Charge Current vs.
Temperature
8.5
13
15
VIN(V)
BATT Float Voltage vs.
Temperature
2 Cells
8
10
ICHG(A)
BATT Float Voltage vs. VIN
VBATT (V)
95
VIN=19V
EFFICIENCY (%)
100
0
20
40
60
80
1.2
-20
0
20
40
60
80
VIN(V)
MP2612 Rev. 1.0
3/9/2020
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7
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=19V, C1=4.7μF, C2=22μF, L=4.7μH, RS1=100mΩ, Real Battery Load, TA=25ºC, unless
otherwise noted.
VIN
10V/div.
VBATT
5V/div.
Steady State Waveform
Steady State Waveform
Steady State Waveform
Trickle Charge
2 Cells, VBATT=5V
CC Charge
2 Cells, VBATT=7.4V
CV Charge
2 Cells, VBATT=8.4V
VIN
10V/div.
VBATT
5V/div.
VIN
10V/div.
VBATT
5V/div.
VSW
10V/div.
VSW
10V/div.
VSW
10V/div.
IBATT
500mA/div.
IBATT
200mA/div.
IBATT
1A/div.
Power On Waveform
Power Off Waveform
EN On Waveform
2 Cells, ICHG=2A,VBATT=8V
2 Cells, ICHG=2A,VBATT=8V
2 Cells, ICHG=2A,VBATT=8V
VEN
5V/div.
VIN
10V/div.
VIN
10V/div.
VBATT
5V/div.
VBATT
5V/div.
VBATT
5V/div.
VSW
10V/div.
VSW
10V/div.
VSW
10V/div.
IBATT
2A/div.
IBATT
2A/div.
IBATT
2A/div.
EN Off Waveform
NTC Control,
Timer Out
2 Cells, ICHG=2A,VBATT=8V
VBATT=7.4V
2 Cells, VBATT=7.4V, CTMR=1nF
VEN
5V/div.
VNTC
2V/div.
VBATT
5V/div.
VBATT
5V/div.
VBATT
5V/div.
VSW
10V/div.
VSW
10V/div.
VTMR
500mV/div.
IBATT
2A/div.
IBATT
2A/div.
MP2612 Rev. 1.0
3/9/2020
VIN
10V/div.
IBATT
2A/div.
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8
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=19V, C1=4.7μF, C2=22μF, L=4.7μH, RS1=110mΩ, RS2=20mΩ, Real Battery Load, TA=25ºC,
unless otherwise noted.
Power Path Management
Current Sharing
Power Path Management
Steady State
2 Cells, ICHG=2A, VBATT=7.4V
VIN
10V/div.
VBATT
5V/div.
ISYS
1A/div.
IBATT
1A/div.
2 Cells, ICHG=2A, VBATT=8V, ISYS=0.8A
VIN
10V/div.
VSW
10V/div.
ISYS
500mA/div.
IBATT
1A/div.
VIN
10V/div.
VBATT
5V/div.
IBATT
1A/div.
VSYS
5V/div.
VIN
10V/div.
VBATT
5V/div.
IBATT
1A/div.
VSYS
5V/div.
MP2612 Rev. 1.0
3/9/2020
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9
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
Name
Description
Thermistor Input. Connect a resistor from this pin to the pin VREF33 and the Thermistor
from this pin to ground.
Valid Input Supply Indicator. A logic LOW on this pin indicates the presence of a valid input
ACOK supply.
Charging Completion Indicator. A logic LOW indicates charging operation. The pin will
CHGOK become an open drain once the charging is complete.
Internal linear regulator 3.3V reference output. Bypass to GND with a 1μF ceramic
VREF33
capacitor.
NTC
VREF25 Internal linear 2.5V reference circuit. PLEASE KEEP THIS PIN FLOATING.
EN
On/Off Control Input.
8
Command Input for the number of Li-Ion Cells. Connect this pin to VREF33 for 3-cell
operation or ground the pin for 2-cell operation. DO NOT LEAVE THIS PIN FLOAT.
COMPV V-LOOP Compensation. Decouple this pin with a capacitor and a resistor.
9
COMPI I-LOOP Compensation. Decouple this pin with a capacitor and a resistor.
7
CELLS
10
BATT
11
CSP
Positive Battery Terminal.
Battery Current Sense Positive Input. Connect a resistor RSEN between CSP and BATT. The
200mV
.
full charge current is: ICHG A
RS1mΩ
12
GND
Ground. This pin is the voltage reference for the regulated output voltage. For this reason
care must be taken in its layout. This node should be placed outside of the switching diode
(D2) to the input ground path to prevent switching current spikes from inducing voltage
noise into the part.
13
TMR
Set time constant. 0.1uA current charges and discharges the external cap.
14
BST
15
SW
16
IN
MP2612 Rev. 1.0
3/9/2020
Bootstrap. This capacitor is needed to drive the power switch’s gate above the supply
voltage. It is connected between SW and BS pins to form a floating supply across the power
switch driver.
Switch Output.
Supply Voltage. The MP2612 operates from a 9V to 24V unregulated input to charge 2~3
cell li-ion battery. Capacitor is needed to prevent large voltage spikes from appearing at the
input.
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10
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
BLOCK DIAGRAM
Figure 3—Function Block Diagram
MP2612 Rev. 1.0
3/9/2020
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11
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
OPERATION
The MP2612 is a peak current mode controlled
switching charger for use with Li-Ion batteries.
switcher is determined by the COMPI voltage
that is regulated by the amplifier GMI.
Figure 3 shows the block diagram. At the
beginning of a cycle, M1 is off. The COMP
voltage is higher than the current sense result
from amplifier A1’s output and the PWM
comparator’s output is low. The rising edge of the
600 kHz CLK signal sets the RS Flip-Flop. Its
output turns on M1 thus connecting the SW pin
and inductor to the input supply.
When the battery voltage reaches the “constant
voltage mode” threshold, the amplifier GMV will
regulate the COMP pin, and then the duty cycle.
The charger will then operate in “constant voltage
mode.”
The increasing inductor current is sensed and
amplified by the Current Sense Amplifier A1.
Ramp compensation is summed to the output of
A1 and compared to COMP by the PWM
comparator.
When the sum of A1’s output and the Slope
Compensation signal exceeds the COMP voltage,
the RS Flip-Flop is reset and M1 is turned off.
The external switching diode D2 then conducts
the inductor current.
If the sum of A1’s output and the Slope
Compensation signal does not exceed the COMP
voltage, then the falling edge of the CLK resets
the Flip-Flop.
The MP2612 have two internal linear regulators
power internal circuit, VREF33 and VREF25. The
output of 3.3V reference voltage can also power
external circuitry as long as the maximum current
(50mA) is not exceeded. A 1μF bypass capacitor
is required from VREF33 to GND to ensure
stability. The output of 2.5V reference voltage
can not carry any load.
In typical application, VREF25 should be float
and no capacitor is required. It can only connect
to a capacitor which is smaller than 100pF.
Charge Cycle (Mode change: Trickle CC
CV)
The battery current is sensed via RS1 (Figure 3)
and amplified by A2. The charge will start in
“trickle charging mode” (10% of the RSEN
programmed current ICC) until the battery voltage
reaches 2.8V/cell. If the charge stays in the
“trickle charging mode” till “timer out” condition is
triggered, the charge is terminated. Otherwise,
the output of A2 is then regulated to the level set
by RS1. The charger is operating at “constant
current charging mode.” The duty cycle of the
MP2612 Rev. 1.0
3/9/2020
Automatic Recharge
A programmable time delay after the battery
charging current drops below the termination
threshold, the charger will cease charging and
the CHGOK pin becomes an open drain. If for
some reason, the battery voltage is lowered to
4.0V/Cell, recharge will automatically kick in.
Termination Delay 1min
C TMR
0.1uF
Charger Status Indication
MP2612 has two open-drain status outputs:
CHGOK and ACOK . The ACOK pin pulls low
when an input voltage is greater than battery
voltage 300mV and over the under voltage
lockout threshold. CHGOK is used to indicate the
status of the charge cycle. Table 1 describes the
status of the charge cycle based on the
CHGOK and ACOK outputs.
Table 1―Charging Status Indication
ACOK
low
low
CHGOK
low
high
high
high
Charger status
In charging
End of charge,
Vin
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