MP2610ER-Z-LF-Z [MPS]
POWER SUPPLY SUPPORT CKT,;
| 型号： | MP2610ER-Z-LF-Z |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | POWER SUPPLY SUPPORT CKT, |
| 文件： | 总16页 (文件大小：450K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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 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.
•
•
•
•
•
•
•
•
•
•
•
•
•
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
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.
APPLICATIONS
•
•
•
•
Distributed Power Systems
Chargers for 1-Cell or 2-Cell Li-Ion Batteries
Smart Phones
The MP2610 requires a minimum number of
readily available standard external components.
Portable DVD Player
The MP2610 is available in 4mm×4mm 16-pin
QFN package.
“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
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
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
PIN 1 ID
16
15
14
13
NTC
ACOK
1
2
3
4
12 GND
11
CSP
CHGOK
VREF33
10 BATT
9
COMPI
5
6
7
8
EXPOSED PAD
ON BACKSIDE
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
4mm×4mm QFN16................. 46.......10... °C/W
θJA
θJC
Supply Voltage VIN ....................................... 26V
V
SW........................................-0.3V to VIN + 0.3V
VBST ......................................................VSW + 6V
CSP, VBATT, ...................................-0.3V to +18V
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.
V
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
Recommended Operating Conditions (3)
Supply Voltage VIN ..............................5V to 24V
Operating Junct.Temp(TJ)........ -20°C to +125°C
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7 4-layer board.
MP2610 Rev. 0.91
7/13/2010
www.MonolithicPower.com
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© 2010 MPS. All Rights Reserved.
2
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
Min
Typ
4.2
8.4
Max
4.232
8.463
1
Units
CELLS=0V
4.168
8.337
Terminal Battery Voltage
VBATT
V
CELLS= VREF33
CSP，BATT Current
Switch On Resistance
Switch Leakage
ICSP,IBATT Charging disabled
µA
Ω
RDS(ON)
0.2
0
10
μA
EN= 4V, VSW = 0V
CC Mode
3.8
1.75
2.0
A
A
Peak Current Limit
Trickle Mode
CC current
ICC
RS1= 100mΩ
1.8
5%
2.2
A
Trickle charge current
ITRICKLE
10%
2.8
ICC
V
CELLS=0V
Trickle
charge
voltage
threshold
CELLS=3.3V
5.6
V
Trickle charge hysteresis
350
10%
mV
ICC
Termination current threshold
IBF
15%
CELLS=0V,
Oscillator Frequency
fSW
1.1
MHz
VBATT =4.5V
Fold-back Frequency
Maximum Duty Cycle
VBATT =0V
350
kHz
%
87
Maximum
Voltage (CSP to BATT)
current
Sense
VSENSE
tON
170
200
100
3.2
230
3.4
mV
ns
CELLS=0V,
Minimum On Time
VBATT =5V
Under
Threshold Rising
Under Voltage
Threshold Hysteresis
Open-drain sink
Voltage
Lockout
Lockout
current
3
5
V
200
mV
VDRAIN =0.3V
mA
( ACOK ), (CHGOK )
Dead-battery indication
Termination delay
Stay at trickle mode
30
1
min
min
Time after IBF reached
Recharge threshold at VBATT
Recharge Hysteresis
VRECHG
4.0
100
V/cell
mV/Cell
RNTC=NCP18XH103 (0°C)
73
NTC
Low
Temp
Rising
%of
Threshold
VREF33
Recovery Hysteresis
3
30
2
RNTC=NCP18XH103 (50°C)
Recovery Hysteresis
NTC High Temp Falling
Threshold
%of
VREF33
VIN min head-room (reverse
blocking)
VIN − VBATT
180
mV
MP2610 Rev. 0.91
7/13/2010
www.MonolithicPower.com
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© 2010 MPS. All Rights Reserved.
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
Min
Typ
Max
Units
0.16
mA
EN=4V
EN=4V,
Consider
pin output current.
Supply Current (Shutdown)
VREF33
0.32
mA
R3=10k, RNTC=10k
Supply Current (Quiescent)
2.0
0.4
mA
V
EN=0V, CELLS=0V
EN Input Low Voltage
EN Input High Voltage
1.8
V
4
EN
EN
=4V
=0V
μA
EN Input Current
0.2
Thermal Shutdown
150
2.5
3.3
30
°C
V
VREF25 output voltage
VREF33 output voltage
VREF33 load regulation
V
ILOAD =0 to 10mA
50
mV
MP2610 Rev. 0.91
7/13/2010
www.MonolithicPower.com
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© 2010 MPS. All Rights Reserved.
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MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
PIN FUNCTIONS
Pin #
Name
Description
Thermistor Input. Connect a resistor from this pin to the pin VREF33 and the Thermistor
from this pin to ground.
1
NTC
Valid Input Supply Indicator. A logic LOW on this pin indicates the presence of a valid
input supply.
2
3
4
ACOK
Charging Completion Indicator. A logic LOW indicates charging operation. The pin will
become an open drain once the charging is completed or suspended.
CHGOK
VREF33
Internal linear regulator 3.3V reference output. Bypass to GND with a 1μF ceramic
capacitor.
5
6
VREF25 Internal linear regulator 2.5V reference output.
On/Off Control Input.
EN
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.
7
8
CELLS
COMPV 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
CSP
Positive Battery Terminal.
Battery Current Sense Positive Input. Connect a resistor RS1 between CSP and BATT.
200mV
11
12
I
(
A =
)
The full charge current is:
.
CHG
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
GND,
Exposed diode (D2) to the input ground path to prevent switching current spikes from inducing
Pad
TMR
BST
SW
IN
voltage noise into the part. Connect exposed pad to ground plane for optional thermal
performance.
13
14
15
16
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.
MP2610 Rev. 0.91
7/13/2010
www.MonolithicPower.com
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© 2010 MPS. All Rights Reserved.
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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
1-Cell Battery Charge Curve
2-Cell Battery Charge Curve
4.2
4.18
4.16
4.14
4.12
4.1
2.5
8.6
2.5
2
2.5
V
=19V
V
IN
8.4
8.2
8
BATT
2
2
V
BATT
V
=24V
IN
1.5
1
1.5
1
1.5
1
7.8
7.6
7.4
7.2
4.08
4.06
4.04
4.02
4
I
BATT
0.5
0
0.5
0
0.5
I
BATT
0
1
2
3
4
5
0
0
50
100
TIMES(MIN)
150
200
0
10 20 30 40 50 60 70
TIMES(MIN)
BATTERY VOLTAGE(V)
2-cell Charge Current
vs. Battery Voltage
NTC Control Window
Efficiency vs. I
CHG
1-Cell, V
=4.2V, CC Load
BATT
3
2.5
2
2.5
2
100
90
80
70
60
50
V
=19 V
IN
V
=12V
Low Temp Off
Low Temp On
IN
V
=24V
IN
1.5
1
V
=24V
IN
1.5
1
V
=19V
IN
High Temp On
High Temp Off
0.5
0.5
0
V
=12V
IN
0
0
2
4
6
8
10
8
12
16
20
24
28
0
0.4
0.8
I
1.2
(A)
1.6
2
V
(V)
BATTERY VOLTAGE(V)
CHG
IN
Efficiency vs. V
Efficiency vs. V
BATT Float Voltage vs. V
CHG
CHG
IN
2-Cell, V
=8.4V, CC Load
BATT
2-Cell, V
=7.4V, CC Load
BATT
95
92
89
86
83
80
5.0
4.0
3.0
2.0
1.0
0
100
90
80
70
60
50
V
=12V
IN
V
=24V
IN
V
=19V
IN
1Cell Battery
5
10
15
(V)
20
25
5
10
15
20
25
0
0.4
0.8
I
1.2
(A)
1.6
2
V
(V)
V
IN
CHG
IN
MP2610 Rev. 0.91
7/13/2010
www.MonolithicPower.com
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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, V =2.5V, CV Load
CV Change
1-Cell, V
CC Change
=4.2V, CV Load
BATT
1-Cell, V
=3.8V, CV Load
BATT
BATT
V
IN
10V/div
V
V
IN
IN
10V/div
10V/div
V
BATT
2V/div
V
V
BATT
2V/div
BATT
2V/div
V
SW
V
V
SW
SW
10V/div
10V/div
10V/div
I
I
I
BATT
BATT
BATT
200mA/div
500mA/div
2A/div
Power On Waveform
Power Off Waveform
EN On Waveform
1-Cell, I
=2A,V
=4V
1-Cell, I
=2A,V =4V
BATT
1-Cell, I
=2A,V =4V
BATT
CHG
BATT
CHG
CHG
V
EN
5V/div
BATT
2V/div
V
BATT
2V/div
V
V
BATT
2V/div
V
IN
V
IN
10V/div
10V/div
V
10V/div
V
SW
10V/div
SW
V
SW
10V/div
I
I
BATT
BATT
I
BATT
2A/div
1A/div
1A/div
EN Off Waveform
NTC Control
Time Out
1-Cell, I
=2A,V
=4V
1-Cell, V
=3.8V, CV Load
BATT
1-Cell, V
=3.8V, CV Load, C
=1nF
CHG
BATT
BATT
TMR
V
EN
V
5V/div
BATT
2V/div
IN
V
NTC
2V/div
V
10V/div
V
BATT
2V/div
V
BATT
V
SW
2V/div
10V/div
V
TMR
V
SW
10V/div
500mV/div
I
I
BATT
BATT
I
BATT
2A/div
2A/div
1A/div
MP2610 Rev. 0.91
7/13/2010
www.MonolithicPower.com
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© 2010 MPS. All Rights Reserved.
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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.
“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.
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.
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.
Automatic Recharge
1 minute after the battery charging current drops
below the termination threshold, the charger will
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.
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
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.
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
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.
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
Charger status
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
low
low
CHGOK
low
high
In charging
End of charge
Vin
<
UVLO, thermal
high
high
shutdown, timer out, EN
disable
In typical application, VREF25 should be float
and no capacitor is required. It can only connect
to a capacitor which is smaller than 100pF.
Timer Operation
Charge Cycle (Mode change: TrickleÆ CCÆ
CV)
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 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
The trickle mode charge time is:
MP2610 Rev. 0.91
7/13/2010
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MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
A resistor with appropriate value should be
CTMR
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.
TTICKLE_TMR = 30mins×
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.
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_TC
VBATT>VBATT_FULL
VBATT_TC<VBATT<VBATT_FULL
T.C.C
C.V.C
C.C.C
No
No
No
ICHG<IBF
Battery Full?
VBATT>VBATT_FULL
VBATT>VBATT_TC
Yes
Yes
Yes
Charger “Off”,
ACOK is low,
CHGOK is high
Yes
No
VBATT
<VBATT_RECHG
?
No
No
No
Tj>=150oC?
Timer Out ?
NTC Fault?
Yes
Yes
Yes
Charge
Charge Current
Thermal Shutdown
Charge Suspend
Termination,
ACOK& CHGOK
is high
No
No
NTC OK?
Yes
Tj<=130oC?
Yes
Charger Recovery,
Return to Normal
Operation
Fault Protection
Figure 5— Fault Protection 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
APPLICATION INFORMATION
Setting the Charge Current
Assume that the NTC window is between 0ºC
and 50ºC, the following equations could be
derived:
The charge current of MP2610 is set by the
sense resistor RS1 (Figure1). The charge current
programmable formula is as following:
R6//RNTC_Cold
VTH_Low
=
= 73%
= 30%
(4)
(5)
200mV
R3 +R6//RNTC_Cold VREF33
ICHG (A) =
(1)
RS1(mΩ)
R6//RNTC_Hot
VTH_High
R3 + R6//RNTC_Hot VREF33
=
Table2—ICHG Setting
ICHG(A)
2
RS(mΩ)
100
According to equation (4) and equation (5), we
can find that R3 = 9.63k and R6 = 505k.
1.5
1
133
200
0.8
0.5
250
400
To be simple in project, making R3=10k and R6
no connect will approximately meet the
specification.
Selecting the Inductor
A 1µH to 10µH inductor is recommended for
most applications. The inductance value can be
derived from the following equation.
VREF33
VOUT ×(V − VOUT
)
IN
L =
(2)
V × ΔIL × fOSC
Low Temp Threshold
IN
R3
VTH_Low
Where ΔIL is the inductor ripple current. VOUT
is 1/2 Cell battery voltage.
NTC
RNTC
R6
Choose inductor current to be approximately
30% if the maximum charge current, 2A. The
maximum inductor peak current is:
High Temp Threshold
VTH_High
ΔIL
2
IL(MAX) = ILOAD
+
(3)
Figure 6— NTC function block
Under light load conditions below 100mA, larger
inductance is recommended for improved
efficiency.
Selecting the Input Capacitor
The input capacitor reduces the surge current
drawn from the input and also the switching noise
from the device. The input capacitor impedance
at the switching frequency should be less than
the input source impedance to prevent high
frequency switching current passing to the input.
Ceramic capacitors with X5R or X7R dielectrics
are highly recommended because of their low
ESR and small temperature coefficients. For
most applications, a 4.7µF capacitor is sufficient.
For optimized efficiency, the inductor DC
resistance is recommended to be less than
200mꢀ.
NTC Function
As Figure 6 shows, the low temperature
threshold and high temperature threshold are
preset internally via a resistive divider, which are
73%·VREF33 and 30%·VREF33. For a given
NTC thermistor, we can select appropriate R3
and R6 to set the NTC window.
Selecting the Output Capacitor
The output capacitor keeps output voltage ripple
small and ensures regulation loop stability. The
output capacitor impedance should be low at the
switching frequency. Ceramic capacitors with
X5R or X7R dielectrics are recommended.
In detail, for the thermistor (NCP18XH103) noted
in above electrical characteristic,
At 0ºC, RNTC_Cold = 27.445kꢀ;
At 50ºC, RNTC_Hot = 4.1601kꢀ.
MP2610 Rev. 0.91
7/13/2010
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© 2010 MPS. All Rights Reserved.
13
MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
PC Board Layout
voltage drop, and realizing less minimum input to
charge a single cell battery full. The charge
current is set to be 1A to satisfy turbo USB or
5Vin Wall-Adapter specification requirement and
realize the fast charging.
The high frequency and high current paths (GND,
IN and SW) should be placed to the device with
short, direct and wide traces. The input capacitor
needs to be as close as possible to the IN and
GND pins. The external feedback resistors
should be placed next to the FB pin. Keep the
switching node SW short and away from the
feedback network.
Figure 8 is the typical charging curve. The charge
current can’t keep constant at the setting value
during the operation at the constant current
charging mode. It drops down when the
maximum duty of the part is hit. Set the charge
current lower, the constant current charge
duration will be extended. Results illuminates that
MP2610 is reasonable for the usual USB input
application.
Application for USB Input
When a USB is selected as the power source of
the switching charger, the typical application
circuit is as figure 7 shows. One PMOS is used
instead of the block diode D1 to low down the
MP2610 Rev. 0.91
7/13/2010
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© 2010 MPS. All Rights Reserved.
14
MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
VIN
R6
C8
C1
50k
USB Input
0.1uF
4.7uF
M2
L
RS1
R1 R2
VIN
SW
VREF33
VREF25
4.7uH
C7
C2
22uF
400m
1-cell
battery
C3
1uF
D2
BST
0.1uF
MP2610
CHGOK
CSP
ACOK
BATT
R3
10k
R5
750
CELLS
COMPI
C5
2.2nF
NTC
EN
RNTC
10k
ON
OFF
COMPV GND TMR
R4
2.5k
C6
0.1uF
C4
2.2nF
Figure 7— Typical Application Circuit for USB Input
Battery Charge Curve @ USB IN
Constant Current
1.2
1
4.2
Maximum
Duty Operation
VBAT
4
0.8
0.6
0.4
0.2
0
3.8
3.6
3.4
3.2
3
IBAT
CC
Charge
CV
Charge
0
20
40
60
80
100
120
140
TIME (MINUTES)
Figure 8— Battery Charge Curve @ USB In
MP2610 Rev. 0.91
7/13/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
15
MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER
PACKAGE INFORMATION
QFN16 (4mm x 4mm)
3.90
4.10
2.15
2.45
PIN 1 ID
SEE DETAIL A
0.50
0.70
13
16
PIN 1 ID
MARKING
0.25
12
1
4
0.35
3.90
4.10
2.15
2.45
0.65
BSC
PIN 1 ID
INDEX AREA
9
8
5
TOP VIEW
BOTTOM VIEW
PIN 1 ID OPTION A
0.45x45º TYP.
PIN 1 ID OPTION B
R0.25 TYP.
0.80
1.00
0.20 REF
0.00
0.05
DETAIL A
SIDE VIEW
3.80
2.30
NOTE:
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) JEDEC REFERENCE IS MO-220, VARIATION VGGC.
5) DRAWING IS NOT TO SCALE.
1.00
0.35
0.65
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. 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.
MP2610 Rev. 0.91
7/13/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
16
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