MP2610
2A, 24V Input, 1.1MHz
1/2 - Cell Switching Li-Ion Battery Charger
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP2610 is a monolithic switching charger
for 1 or 2 cells Li-Ion battery packs with a builtin 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.
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MP2610 regulates the charge current and
charger voltage using two control loops to
realize high accuracy CC charge and CV
charge.
Fault condition protection includes cycle - by cycle current limiting and thermal shutdown.
Other safety features include battery temperature
monitoring, charge status indication, and
programmable timer to cease the charging cycle.
The MP2610 requires a minimum number of
readily available standard external components.
The MP2610 is available in 4mm×4mm 16-pin
QFN package.
Charges 1/2 - cell Li-Ion battery packs
Wide 5V to 24V Operating Input Range
Up to 2A Programmable Charging Current
±0.75% VBATT Accuracy
0.2Ω Internal Power MOSFET Switch
Up to 90% Efficiency
Fixed 1.1MHz 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
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Distributed Power Systems
Chargers for 1-Cell or 2-Cell Li-Ion Batteries
Smart Phones
Portable DVD Player
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Figure 1—Standalone Switching Charger
MP2610 Rev. 0.91
7/13/2010
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1
MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
ORDERING INFORMATION
Part Number*
Package
Top Marking
Free Air Temperature (TA)
MP2610ER
4mm×4mm QFN16
2610ER
-20ºC to +85ºC
* For Tape & Reel, add suffix-z (e.g. MP2610ER-Z);
For RoHS Compliant packaging, add suffix-LF (e.g. MP2610ER-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 (1)
Thermal Resistance
Supply Voltage VIN ....................................... 26V
VSW ........................................-0.3V to VIN + 0.3V
VBST ...................................................... VSW + 6V
VCSP, VBATT, ...................................-0.3V to +18V
All Other Pins ..................................-0.3V to +6V
(2)
Continuous Power Dissipation (TA=+25°C)
............................................................. 2.7W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature............... -65°C to +150°C
4mm×4mm QFN16 ................. 46 .......10... °C/W
Recommended Operating Conditions
(3)
(4)
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-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.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7 4-layer board.
Supply Voltage VIN ..............................5V to 24V
Operating Junct.Temp(TJ)........ -20°C to +125°C
MP2610 Rev. 0.91
7/13/2010
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MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICS
VIN = 19V, TA = +25°C, CELLS=0V, unless otherwise noted.
Parameters
Symbol Condition
Terminal Battery Voltage
VBATT
Switch On Resistance
Max
Units
4.168
8.337
4.2
8.4
4.232
8.463
V
1
µA
RDS(ON)
Switch Leakage
0.2
0
EN = 4V, VSW = 0V
Peak Current Limit
CC current
ICC
Trickle charge current
charge
Typ
ICSP,IBATT Charging disabled
CSP，BATT Current
Trickle
threshold
CELLS=0V
CELLS= VREF33
Min
IBF
Oscillator Frequency
fSW
Fold-back Frequency
Maximum Duty Cycle
Maximum
current
Sense
Voltage (CSP to BATT)
Minimum On Time
A
Trickle Mode
1.75
A
RS1= 100mΩ
1.8
Under
Voltage
Threshold Rising
Under
Voltage
Threshold Hysteresis
Open-drain
sink
2.0
2.2
ICC
CELLS=0V
2.8
V
CELLS=3.3V
5.6
V
350
mV
5%
CELLS=0V,
VBATT =4.5V
VBATT =0V
VSENSE
170
CELLS=0V,
VBATT =5V
Lockout
10%
15%
Lockout
MHz
350
kHz
%
200
3.2
200
VDRAIN =0.3V
( ACOK ), ( CHGOK )
ICC
1.1
230
100
3
current
A
10%
87
tON
μA
3.8
Trickle charge hysteresis
Termination current threshold
10
CC Mode
ITRICKLE
voltage
Ω
5
mV
ns
3.4
V
mV
mA
Dead-battery indication
Stay at trickle mode
30
min
Termination delay
Recharge threshold at VBATT
Recharge Hysteresis
Time after IBF reached
1
4.0
100
min
V/cell
mV/Cell
Rising
RNTC=NCP18XH103 (0°C)
73
Falling
Recovery Hysteresis
RNTC=NCP18XH103 (50°C)
Recovery Hysteresis
3
30
2
%of
VREF33
VIN − VBATT
180
NTC
Low
Threshold
Temp
NTC High
Threshold
Temp
VIN min head-room (reverse
blocking)
MP2610 Rev. 0.91
7/13/2010
VRECHG
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%of
VREF33
mV
3
MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 19V, TA = +25°C, CELLS=0V, unless otherwise noted.
Parameters
Symbol Condition
Supply Current (Shutdown)
Supply Current (Quiescent)
Min
Typ
0.16
mA
EN =4V,
Consider
VREF33
pin output current.
R3=10k, RNTC=10k
0.32
mA
EN =0V, CELLS=0V
2.0
mA
0.4
V
1.8
EN Input High Voltage
EN Input Current
Thermal Shutdown
VREF25 output voltage
VREF33 output voltage
VREF33 load regulation
Units
EN =4V
EN Input Low Voltage
MP2610 Rev. 0.91
7/13/2010
Max
V
EN =4V
4
EN =0V
0.2
ILOAD =0 to 10mA
150
2.5
3.3
30
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μA
50
°C
V
V
mV
4
MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
PIN FUNCTIONS
Pin #
Name
1
NTC
2
ACOK
3
CHGOK
4
VREF33
5
VREF25
6
EN
7
CELLS
8
COMPV
Command Input for the Number of Li-Ion Cells. Connect this pin to VREF33 for 2-cell
operation or ground the pin for 1-cell operation. Do not leave this pin float.
V-LOOP Compensation. Connect this pin with a capacitor and a resistor.
9
COMPI
I-LOOP Compensation. Connect this pin with a capacitor and a resistor.
10
BATT
11
CSP
12
GND,
Exposed
Pad
13
TMR
14
BST
15
SW
16
IN
MP2610 Rev. 0.91
7/13/2010
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 supply.
Charging Completion Indicator. A logic LOW indicates charging operation. The pin will
become an open drain once the charging is completed or suspended.
Internal linear regulator 3.3V reference output. Bypass to GND with a 1μF ceramic
capacitor.
Internal linear regulator 2.5V reference output.
On/Off Control Input.
Positive Battery Terminal.
Battery Current Sense Positive Input. Connect a resistor RS1 between CSP and BATT.
200mV
The full charge current is: ICHG (A ) =
.
RS1(mΩ )
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. Connect exposed pad to ground plane for optional thermal
performance.
Set time constant. 0.1μA current charges and discharges the external cap.
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 MP2610 operates from a 5V to 24V unregulated input to charge 1~2
cell li-ion battery. Capacitor is needed to prevent large voltage spikes from appearing at
the input.
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MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=19V, C1=4.7uF, C2=22uF, L=4.7uH, RS1=100mΩ, Real Battery Load, TA=25ºC, unless
otherwise noted.
1-cell Charge Current
vs. Battery Voltage
2.5
4.12
1.5
4.1
1
4.08
4.06
IBATT
4.04
0.5
4.02
0
10
20 30 40 50
TIMES(MIN)
60
VIN=24V
1. 5
1
0. 5
0
4
VIN=12V
0
0
70
2-cell Charge Current
vs. Battery Voltage
VNTC(V)
CHARGE CURRENT(A)
5
1
0. 5
1.5
High Temp On
1
High Temp Off
0
10
8
12
BATTERY VOLTAGE(V)
Efficiency vs. VCHG
90
VIN=24V
VBATT(V)
VIN=19V
16
20
VIN (V)
24
70
0.4
MP2610 Rev. 0.91
7/13/2010
0.8
1.2
ICHG(A)
1.6
0
1Cell Battery
2
5
10
15
VIN (V)
20
25
0.4
0.8
1.2
ICHG(A)
1.6
2
2-Cell, VBATT=7.4V, CC Load
92
2.0
VIN=24V
Efficiency vs. VCHG
4.0
3.0
VIN=19V
60
95
0
50
VIN=12V
70
5.0
1.0
60
0
200
50
28
EFFICIENCY (%)
VIN=12V
80
100
150
TIMES(MIN)
80
BATT Float Voltage vs. VIN
2-Cell, VBATT=8.4V, CC Load
100
50
90
0.5
VIN=12V
8
0
0
Efficiency vs. ICHG
Low Temp On
2
6
0.5
IBATT
7.4
Low Temp Off
2.5
1. 5
4
1
7.6
100
VIN=24V
2
7.8
1-Cell, VBATT=4.2V, CC Load
VIN=19 V
0
0
1.5
8
7.2
1
2
3
4
BATTERY VOLTAGE(V)
3
2
2
VBATT
8.2
NTC Control Window
2. 5
EFFICIENCY (%)
8.4
BATTERY VOLTAGE(V)
4.14
VIN=19V
2
EFFICIENCY (%)
BATTERY VOLTAGE(V)
2
CHARGE CURRENT(A)
VBATT
4.16
2.5
8.6
2. 5
BATTERY CURRENT(A)
4.2
4.18
2-Cell Battery Charge Curve
BATTERY CURRENT(A)
1-Cell Battery Charge Curve
89
86
83
80
5
10
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15
VIN (V)
20
25
6
MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=19V, C1=4.7uF, C2=22uF, L=4.7uH, RS1=100mΩ, Real Battery Load, TA=25ºC, unless
otherwise noted.
Steady State Waveform
Steady State Waveform
Steady State Waveform
Trickle Change
1-Cell, VBATT=2.5V, CV Load
CV Change
1-Cell, VBATT=4.2V, CV Load
CC Change
1-Cell, VBATT=3.8V, CV Load
VIN
10V/div
VBATT
2V/div
VIN
10V/div
VBATT
2V/div
VIN
10V/div
VBATT
2V/div
VSW
10V/div
VSW
10V/div
VSW
10V/div
IBATT
200mA/div
IBATT
2A/div
IBATT
500mA/div
Power On Waveform
Power Off Waveform
1-Cell, ICHG=2A,VBATT=4V
VSW
10V/div
IBATT
1A/div
IBATT
2A/div
EN Off Waveform
VSW
10V/div
IBATT
1A/div
MP2610 Rev. 0.91
7/13/2010
IBATT
1A/div
NTC Control
1-Cell, ICHG=2A,VBATT=4V
VEN
5V/div
VBATT
2V/div
1-Cell, ICHG=2A,VBATT=4V
VEN
5V/div
VBATT
2V/div
VBATT
2V/div
VIN
10V/div
VSW
10V/div
VBATT
2V/div
VIN
10V/div
VSW
10V/div
EN On Waveform
1-Cell, ICHG=2A,VBATT=4V
Time Out
1-Cell, VBATT=3.8V, CV Load
VNTC
2V/div
VBATT
2V/div
VSW
10V/div
IBATT
2A/div
1-Cell, VBATT=3.8V, CV Load, CTMR=1nF
VIN
10V/div
VBATT
2V/div
VTMR
500mV/div
IBATT
2A/div
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MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
BLOCK DIAGRAM
Figure 2—Function Block Diagram
MP2610 Rev. 0.91
7/13/2010
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MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
OPERATION
The MP2610 is a peak current mode controlled
switching charger for use with Li-Ion batteries.
Figure 2 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
1.1MHz CLK signal sets the RS Flip-Flop. Its
output turns on M1 thus connecting the SW pin
and inductor to the input supply.
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 MP2610 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.
“trickle charging mode till “timer out” condition is
triggered, the charger 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
switcher is determined by the COMPI voltage
that is regulated by the amplifier GMI.
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.”
Automatic Recharge
1 minute 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.
Charger Status Indication
MP2610 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
The output of 2.5V reference voltage can not
carry any load, and it can only be a voltage
reference, like connecting it to the gate of a
MOSFET.
ACOK
In typical application, VREF25 should be float
and no capacitor is required. It can only connect
to a capacitor which is smaller than 100pF.
high
Charge Cycle (Mode change: TrickleÆ CCÆ
CV)
The battery current is sensed via RS1 (Figure 2)
and amplified by A2. The charge will start in
“trickle charging mode” (10% of the RS1
programmed current ICC) until the battery voltage
reaches 2.8V/cell. If the charge stays in the
MP2610 Rev. 0.91
7/13/2010
low
low
CHGOK
low
high
high
Charger status
In charging
End of charge
Vin < UVLO,
thermal
shutdown, timer out, EN
disable
Timer Operation
MP2610 uses internal timer to terminate the
charge if the timer times out. The timer duration
is programmed by an external capacitor at the
TMR pin.
The trickle mode charge time is:
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MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
TTICKLE_TMR
C
= 30mins × TMR
0.1uF
The total charge time is:
TTOTAL_TMR = 3hours ×
CTMR
0.1uF
Negative
Thermal
Coefficient
(NTC)
Thermistor
The MP2610 has a built-in NTC resistance
window comparator, which allows MP2610 to
sense the battery temperature via the thermistor
packed internally in the battery pack to ensure a
safe operating environment of the battery.
A resistor with appropriate value should be
connected from VREF33 to NTC pin and the
thermistor is connected from NTC pin to GND.
The voltage on NTC pin is determined by the
resistor divider whose divide ratio depends on
the battery temperature. When the voltage of pin
NTC falls out of NTC window range, MP2610 will
stop the charging. The charger will restart if the
temperature goes back into NTC window range.
Figure 3—Li-Ion Battery Charge Profile
MP2610 Rev. 0.91
7/13/2010
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MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
Figure 4— Normal Charging Operation Flow Chart
MP2610 Rev. 0.91
7/13/2010
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MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
Normal Operation
Charge On,
ACOK&
CHGOK is low
Charge Mode?
VBATT>VBATT_FULL
VBATT_TC
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