MP2602
28V, 1A Linear
Li-Ion Battery Charger with Trickle Charge
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP2602 is a linear, high-performance
single cell Li-Ion battery charger. By integrating
high voltage input protection into the charger IC,
the MP2602 can tolerate an input surge up to
28V.
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The device features constant current (CC) and
constant voltage (CV) charging modes with
programmable charge currents (85mA to 1A),
programmable battery full threshold, thermal
protection, battery temperature monitoring,
reverse current blocking and trickle charge. The
device also provides AC adapter power good
and charge status indications to the system.
MP2602 is available in 10-pin 3mm x 3mm QFN
packages.
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EVALUATION BOARD REFERENCE
Input Surge Up to 28V
Adapter or USB Input
Programmable Charge Current: 85mA to 1A
Proprietary Constant Voltage Auto Recharge
Proprietary Over-Voltage Protection
0.75% VBATT Accuracy
<1µA Battery Reverse Current
90µA Standby Current from VIN
Battery Temperature Monitoring
Over Current Protection
AC Adapter Power Good Indicator
Charge Status Indicator
Programmable Soft-Start
Programmable Charge Termination Current
Threshold
Tiny 3mm x 3mm QFN Package
APPLICATIONS
Board Number
Dimensions
EV2602DQ-00B
2”X x 1.9”Y x 0.6”Z
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Cell Phones
MP3 Players
Smart Phones
PDAs
Digital Cameras
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
3.5V - 28V
To system
IBATT
1
2
3
ON OFF
4
5
MP2602 Rev.1.3
1/25/2010
IN
BATT
CHG
ISET
MP2602
ACOK
IBF
EN
SS
NTC
GND
10
+
VBATT
_
9
8
7
6
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1
MP2602 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
ABSOLUTE MAXIMUM RATINGS (1)
PACKAGE REFERENCE
IN to GND .................................... –0.3V to +28V
All Other Pins to GND................. –0.3V to +6.5V
Junction Temperature...............................140°C
Lead Temperature ....................................260°C
Storage Temperature ..............–65°C to +150°C
TOP VIEW
IN
1
10
BATT
CHG
2
9
ISET
ACOK
3
8
IBF
EN
4
7
SS
NTC
5
6
GND
Recommended Operating Conditions
Nominal Supply Voltage VIN............ 3.5V to 5.5V
Operating Temperature .............–40°C to +85°C
Thermal Resistance
EXPOSED PAD
ON BACKSIDE
Part Number*
MP2602DQ
*
(2)
(3)
θJA
θJC
3x3 QFN10 ............................. 50 ...... 12... °C/W
Package
QFN10
(3mm x 3mm)
Temperature
–40°C to +85°C
For Tape & Reel, add suffix –Z (eg. MP2602DQ–Z)
For RoHS compliant packaging, add suffix –LF
(eg. MP2602DQ–LF–Z)
Notes:
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
3) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS
VIN = 5V, VEN = 0V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Supply Current
ISUPPLY
Battery Voltage Regulation
Battery Over-Voltage
Protection
VBATT
Min
Typ
EN = High
40
EN = Low, ICHG = 0A
500
TA = –5°C to +75°C, IBATT = 0
4.158
4.20
IBATT_OVP VBATT = 4.25V
Max
Units
µA
4.242
V
0
µA
VIN = 5V, VBATT = 3.8V
RCHG = 3.3kΩΩ
450
515
580
mA
VIN = 5V, VBATT = 3.8V,
TJ = 0°C to +120°C,
RCHG = 1.6 kΩ to 8.0 kΩΩ Ω
87
100
113
%ICHG(4)
5
2.45
10
2.6
100
15
2.75
%ICHG(4)
V
mV
10
50
%ICHG(4)
75
1.19
1.23
125
1.27
%IBF(5)
V
Input ACOK Up Range
5.8
6.0
6.2
V
Input ACOK Low Range
1.8
2.5
3.2
V
5.8
6.0
6.2
V
Constant Current Regulation
ICHG
Constant Current Variation
Trickle Current
Trickle Threshold Voltage
Trickle Voltage Hysteresis
Battery Full Programming
Range
IBF Accuracy
SS Pin Voltage
Input Over Voltage Protection
MP2602 Rev.1.3
1/25/2010
VIN = 5V, VBATT = 2.3V
IBF
Refer to Operation section for
programming IBF
CSS = 0.1uF, VBATT = 3.6V
OVP
VIN Rising
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2
MP2602 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
ELECTRICAL CHARACTERISTICS (continued)
VIN = 5V, VEN = 0V, TA = +25°C, unless otherwise noted.
Parameter
OVP Hysteresis
Symbol Condition
Min
Typ
400
V
0.4
EN Trip Threshold Low
CHG , ACOK Sink Current
Pin Voltage = 0.4V
Battery Reverse Current to
BATT Pin
EN = Low and Input =
Floating or 0V
VBATT = 3.8V, IBATT = 300mA,
RCHG = 1.7kΩ
RON
Soft Thermal Shutdown
Threshold
Soft Thermal Shutdown
Hysteresis
8
V
mA
1
µA
0.35
105
120
Ω
135
10
From trickle to 90% of full
current, CSS = 0.1µF
Soft-Start Time
Units
mV
2.5
EN Trip Threshold High
Switch-On Resistance
Max
10
20
°C
°C
35
ms
Notes:
4) ICHG is the target preprogrammed charge current (Die temperature below 110°C).
5) IBF is the target preprogrammed battery full current threshold.
PIN FUNCTIONS
Pin #
Name
1
IN
Input Supply Pin. IN receives the AC adapter or USB supply voltage.
2
CHG
Open-Drain Charge Status Indicator. This pin is low during charging.
3
ACOK
Open-Drain Input ACOK Indicator. This pin is low if the voltage at the IN pin is between 2.5V
and 6V.
4
EN
Charger IC Enable. An input “Low” signal at this pin or if the pin is floating will enable the IC.
5
NTC
6
GND
7
SS
8
IBF
9
ISET
10
BATT
MP2602 Rev.1.3
1/25/2010
Description
Negative Thermal Coefficient (NTC) Thermistor Pin. Connect a 500kΩ resistor from this pin to
the IN pin and a 100kΩ NTC resistor (within the battery pack) from this pin to ground. If NTC
function is not used, replace NTC resistor with a regular 100kΩ resistor from this pin to ground.
Do not leave this pin floating.
Ground.
Soft-Start Timer. Connect this pin to an external capacitor to program the soft-start startup time
C
using the equation: TSS = SS × 20m sec .
0.1µF
Charge Status Threshold Program. Connect this pin to an external resistor to program the
charge termination current or battery full charge current.
Constant Charge Current Program. Connect this pin to an external resistor to program the
charging current in CC Mode.
Charger Output.
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3
MP2602 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5V, CIN = 10µF, COUT = 4.7µF, TA = +25°C, unless otherwise noted.
Charge Current vs
Battery Voltage
4.5
0.8
4.0
VBATT
0.7
3.5
0.6
3.0
0.5
2.5
0.4
IBATT
0.3
2.0
1.5
0.2
1.0
0.1
0.5
0
0
1.2
CHARGE CURRENT (A)
0.9
BATTERY VOLTAGE (A)
CHARGE CURRENT (A)
Battery Charge Curve
0
40
80
120 160 200
CHARGE TIME (MINUTES)
1.0
0.8
0.6
0.4
0.2
0
0.0
Battery Voltage vs
Input Voltage
Charge Currents vs
Battery Voltage
1100
CHARGE CURRENT (mA)
BATTERY VOLTAGE (V)
4.5
4.3
4.1
3.9
3.7
ICHG=0.43A
3.5
4.5
1.0
2.0
3.0
4.0
BATTERY VOLTAGE (V)
4.8
5.1
5.4
5.8
INPUT VOLTAGE (V)
6.0
1.0A
900
700
500
300
0.5A
0.2A
100
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1
BATTERY VOLTAGE (V)
VIN
5V/div.
VIN
5V/div.
VBATT
2V/div.
VEN
5V/div.
VBATT
2V/div.
VEN
5V/div.
IBATT
0.5A/div.
IBATT
0.5A/div.
2ms/div.
MP2602 Rev.1.3
1/25/2010
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4
MP2602 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, CIN = 10µF, COUT = 4.7µF, TA = +25°C, unless otherwise noted.
CHARGE CURRENT (mA)
1200
Charge Current vs
Input Voltage
16
Charge Current vs
RCHG Resistance
14
1000
12
800
10
600
8
6
400
4
200
2
0
4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0
INPUT VOLTAGE (V)
0
RNTC vs
Input Voltage
0
200 400 600 800 1000
CHARGE CURRENT (mA)
Reverse Current vs
Battery Voltage
400
0.6
TLOW
350
0.5
300
0.4
250
200
0.3
150
0.2
100
THIGH
50
0
4.5
4.8
5.1
5.4
5.8
INPUT VOLTAGE (V)
0.1
6.0
4.30
720
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)
VBATT = 3.8V
700
680
660
640
620
600
-50
MP2602 Rev.1.3
1/25/2010
-25
0
+25 +50
TEMPERATURE (°C)
2.9
3.3
3.7
4.1
BATTERY VOLTAGE (V)
4.5
Battery Voltage vs
Temperature
Charge Current vs
Temperature
740
VIN=0V
0
2.5
+75
ICHG = 15mA
4.26
4.22
4.18
4.14
4.10
-50
-25
0
+25 +50
TEMPERATURE (°C)
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+75
5
MP2602 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
BLOCK DIAGRAM
IN
VIN
CIN
1
R1
NTC
5
BATT I
BATT
RNTC
10
SS
CSS
ISET
CHG
7
+
VBATT
_
COUT
2
BATTERY
CHARGE
CONTROL
9
RCHG
ACOK
IBF
3
8
RBF
4
OFF ON
EN
6
GND
Figure 1—Functional Block Diagram
OPERATION
Input Voltage Range
The MP2602 has built-in input voltage surge
protection as high as +28V. The charger IC will
be automatically disabled when the input
voltage is lower than 2.5V or higher than 6.0V.
The open-drain pin ACOK is used to indicate
an input power good condition (i.e.
2.5V<VIN<6.0V). If the input voltage is lower
than the battery voltage, the IC is also disabled
to prevent the battery from draining.
MP2602 Rev.1.3
1/25/2010
Charge Cycle (Mode Change: Trickle -> CC-> CV)
Figure 2 below shows the typical charging
profile for the MP2602. Figure 3 shows the
typical charging procedure. For a fully depleted
battery with a terminal voltage lower than 2.6V,
the MP2602 will start with the trickle charge
(preconditioning) at 10% of the programmed full
charge current. After the battery voltage
reaches 2.6V, the charger begins charging at
the constant current of the programmed value
(ICHG). This is referred to as Constant Current
(CC) mode. Once the battery voltage reaches
4.2V, the charger will operate in the constant
voltage (CV) mode until the battery is fully
charged. The charge current drops during CV
mode, and the battery full indication is set when
the charge current in the CV mode is reduced
to the programmed full battery current (IBF).
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6
MP2602 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
IBATT
Table 1—RPGM and ICHG Relationship
CC
Charging
ICHG
RCHG (kΩ)
1.65
1.82
2.05
2.32
2.74
3.3
4.12
5.6
8.45
15
CV
Charging
IBF
Charging
Complete
Trickle
Charging
10% of ICHG
VBATT
2.6V
4.2V
Figure 2—MP2602 Typical Charging Profile
VBATT
IBATT
Soft-Start
Time
VBATT
4.2V
Charge Current vs
1/RPGM Resistance
ICHG
90% of ICHG
IBATT
10% of ICHG (IBF)
CHG
Charge
Start
Trickle
Charging
CC
Mode
CV
Mode
Charge
End
Figure 3—MP2602 Typical Charging
Procedure
Battery Over-Voltage Protection and
Automatic Recharge
At any time when VBATT is 50mV higher than the
trimmed charge target, the MP2602 reduces its
charge current to 0µA. This ensures the safety
of the battery. Also, the CV control loop always
monitors the battery voltage such that it will
automatically recharge the battery when it is
depleted below the target level.
Programming of Charge Current and Battery
Full Current
The charge current (ICHG) is set by a resistor
(RCHG) connecting from the ISET pin to GND.
The relationship of the charge current and the
programming resistance is established by the
following table and graph.
MP2602 Rev.1.3
1/25/2010
1000
CHARGE CURRENT (mA)
2.6V
ICHG (mA)
1000
900
800
700
600
500
400
300
200
100
900
800
700
600
500
400
300
200
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7
Figure 4—Charge Current vs 1/RPGM
Resistance
The recommended resistance for programming
the charge current is 2.3kΩ<RCHG<11kΩ. The
battery full charge current threshold (IBF) is
programmed by connecting a resistor RBF from
the IBF pin to GND:
IBF =
1A × 1.7kΩ
R BF
Where 2RCHG<RBF<10RCHG. The open-drain pin
CHG is used to indicate charging status. When
the battery full condition is reached or any other
condition prevents the charger from charging,
CHG will become a floating pin.
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7
MP2602 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
Charge Status Indicator (CHG)
The MP2602 has an integrated charge status
pin that remains low while the battery is
charging. Once the charge current has reduced
to the battery full charge current threshold (IBF),
the CHG pin will become high impedance.
Negative Thermal Coefficient (NTC)
Thermistor
The MP2602 has a built-in NTC resistance
window comparator. If configured as the typical
application circuit as indicated in Figure 1, the
MP2602 will cease charging if RNTC<32.3kΩ or
RNTC>376.6kΩ. This represents a valid charging
temperature range of 0°C to 50°C for the
TH11-4H104F NTC resistor.
Under full charge conditions, certain systems
may draw a very narrow current pulse that
exceeds the IBF threshold. The CHG indicator
may glitch. It is desirable to blank the
CHG glitch so that the system can properly
indicate full charge conditions to the end user.
A simple solution is to add a RC filter on the
CHG pin to filter out the possible CHG glitch,
as shown in Figure 5.
Thermal Protection
The MP2602 has proprietary thermal protection
to prevent the IC from overheating. When in
thermal protection mode, the charge current
becomes a saw-tooth waveform instead of a
DC current. The average current of the sawtooth waveform will be lower than the
programmed DC charge current to prevent the
IC from overheating. The frequency and
amplitude of the saw-tooth current waveform
can be altered by changing the capacitance
value connected to the SS pin. Operating in
thermal protection mode will slow down the
charging process. Lowering the input voltage
and enhancing thermal dissipation to the
environment can effectively prevent the IC from
going into thermal protection mode.
JP4
BAT
GND
VIN
GND
CHG
1
2
IN
BATT
ISET
CHG
10
9
MP2602
3
ACOK
IBF
8
JP1
ACOK
EN
4
5
EN
NTC
SS
GND
JP2
JP3
7
6
NTC
Figure 5—Filtered Charge Status with GPIO Connection
MP2602 Rev.1.3
1/25/2010
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8
MP2602 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
APPLICATION
Flow Chart of Operation
Power-On Reset (POR) feature can be applied
to the MP2602 to ensure that the device starts
operating in a known state. The flow chart in
Figure 5 describes the conditions and operation
modes of the MP2602. CVC and CCC stand for
“constant voltage charge” and “constant current
charge”, respectively.
.
.
. .
VBAT
>2.6V?
>.
4
?
Figure 6—Flow Chart of Operation
MP2602 Rev.1.3
1/25/2010
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9
MP2602 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
PACKAGE INFORMATION
QFN10 (3mm x 3mm)
2.90
3.10
0.30
0.50
PIN 1 ID
MARKING
0.18
0.30
2.90
3.10
PIN 1 ID
INDEX AREA
1.45
1.75
PIN 1 ID
SEE DETAIL A
10
1
2.25
2.55
0.50
BSC
5
6
TOP VIEW
BOTTOM VIEW
PIN 1 ID OPTION A
R0.20 TYP.
PIN 1 ID OPTION B
R0.20 TYP.
0.80
1.00
0.20 REF
0.00
0.05
SIDE VIEW
DETAIL A
NOTE:
2.90
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.
1.70
0.25
2.50
0.50
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.
MP2602 Rev. 1.3
1/25/2010
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© 2010 MPS. All Rights Reserved.
10