MP2606
Single-Cell 1A Linear Li-Ion
Battery Charger without Trickle Charge
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP2606 is a linear, high-performance
single cell Li-Ion battery charger. By integrating
high voltage input protection into the charger IC,
the MP2606 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 and reverse current blocking. The
device also provides AC adapter power good
and charge status indications to the system.
MP2606 is available in 10-pin 3mm x 3mm QFN
package.
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EVALUATION BOARD REFERENCE
Board Number
Dimensions
EV2606DQ-00A
2.0” x 1.9” x 0.6”
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
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
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Cell Phones
MP3/Multimedia Players
Smart Phones
PDAs
Digital Cameras
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
JP4
BAT
IBATT
1
VIN
GND
LED1
Green
IN
BATT
LED2
Red
2 CHG
ISET
GND
10
9
MP2606
3 ACOK
EN
5
8
MP2606 Rev. 1.0
1/25/2010
EN
IBFH
SS
IBFL
GND
4
7
JP1
JP2
JP3
6
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© 2010 MPS. All Rights Reserved.
1
MP2606 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O TRICKLE CHARGE
ABSOLUTE MAXIMUM RATINGS (1)
PACKAGE REFERENCE
TOP VIEW
IN
1
10
BATT
CHG
2
9
ISET
ACOK
3
8
IBFL
EN
4
7
SS
IBFH
5
6
GND
MP2606DQ
*
Recommended Operating Conditions
(2)
Nominal Supply Voltage VIN............ 3.5V to 6.5V
Operating Temperature .............–40°C to +85°C
Thermal Resistance
EXPOSED PAD
ON BACKSIDE
Part Number*
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
(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 (e.g. MP2606DQ–Z)
For RoHS Compliant Packaging, add suffix –LF
(e.g. MP2606DQ–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
T = +25°C, IBATT = 0
T = 0°C to +50°C, IBATT = 0
T = –5°C to +75°C, IBATT = 0
500
4.179
4.168
4.158
4.20
4.20
4.20
IBATT_OVP VBATT = 4.25V
Constant Current
Regulation
ICHG
VIN = 5V, VBATT = 3.8V
RCHG = 3.3kΩ
Max
Units
µA
4.221
4.232
4.242
V
0
µA
450
515
580
mA
87
100
113
%ICHG(4)
10
50
%ICHG(4)
75
1.19
1.23
125
1.27
%IBF(5)
V
Input ACOK Up Range
6.8
7.0
7.2
V
Input ACOK Low Range
1.8
2.5
3.2
V
EN Trip Threshold High
2.0
Constant Current Variation
Battery Full Programming
Range
IBF Accuracy
SS Pin Voltage
IBF
VIN = 5V, VBATT = 3.8V,
TJ = 0°C to +120°C,
RCHG = 1.6kΩ to 8.0kΩ
Refer to Operation section for
programming IBF
CSS = 0.1uF, VBATT = 3.6V
EN Trip Threshold Low
MP2606 Rev. 1.0
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
V
0.4
V
2
MP2606 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O TRICKLE CHARGE
ELECTRICAL CHARACTERISTICS (continued)
VIN = 5V, VEN = 0V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
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
TBD TBD Switch-On
Resistance
Soft Thermal Shutdown
Threshold
Soft Thermal Shutdown
Hysteresis
Soft-Start Time
RON
Min
Typ
Max
8
mA
1
0.35
105
120
10
20
µA
Ω
135
10
CSS = 0.1µF
Units
°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
4
5
6
EN
IBFH
GND
7
SS
8
IBFL
9
ISET
10
BATT
MP2606 Rev. 1.0
1/25/2010
Description
Open-Drain Input ACOK Indicator. This pin is low if the voltage at the IN pin is between 2.5V
and 6V.
Charger IC Enable. An input “Low” signal at this pin or if the pin is floating will enable the IC.
Change Status Hysteresis Program Pin. (See the formular on page 7)
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
MP2606 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O TRICKLE CHARGE
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5V, CIN = 4.7µF, COUT = 2.2µF, TA = +25°C, unless otherwise noted.
Disabled- Mode Supply Current vs.
Input Voltage
Reverse Current vs.
Battery Voltage
0.9
REVERSE CURRENT(uA)
DISABLED SUPPLY CURRENT
(uA)
100
80
60
40
0.8
0.7
0.6
0.5
0.4
20
0
4
8 12 16 20 24
INPUT VOLTAGE (V)
0.3
2.5
28
160
I BFL CURRENT (mA)
800
ICHG CURRENT (mA)
200
120
600
400
200
80
40
0
0
0
5
10
15
20
10
RCHG
Constant Current Mode
Charging
800
VBAT=3.8V
800mA
600
500mA
400
200
200mA4.2
MP2606 Rev. 1.0
1/25/2010
20
30
40
50
60
RBFL
4.6
5.0
5.4
INPUT VOLTAGE (V)
5.8
Charge Voltage vs
RCHG Resistance
300
CHARGE CURRENT(mA)
1000
ICHG CURRENT (mA)
4.5
Battery Full Current Setting
Charge Current Setting
1000
0
2.9
3.3
4.1
3.7
BATTERY VOLTAGE (V)
800mA
500mA
200mA
250
200
150
100
50
0
4.18
4.19
4.185
CHARGE CURRENT (mA)
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© 2010 MPS. All Rights Reserved.
4
MP2606 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O TRICKLE CHARGE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, CIN = 4.7µF, COUT = 2.2µF, TA = +25°C, unless otherwise noted.
1000
CHARGE CURRENT (mA)
800mA
500mA
800
200mA
600
400
200
0
0
1
2
3
4
BATTERY VOLTAGE (V)
5
BATTERY REGULATION VOLTAGE
(V)
Charge Current vs.
Battery Voltage
4.19
4.185
4.18
4.175
ICHG = 0
4.17
-20
0
20
40
60
80
600
200
150
100
50
Vbat=4V
Vbat=3.6V
-40
-20
0
20
40
60
80
CHARGE CURRENT (mA)
CHARGE CURRENT (mA)
4.195
-40
250
0
4.2
500
400
300
200
100
0
Vbat=4V
Vbat=3.6V
-40
-20
0
20
40
60
80
CHARGE CURRENT (mA)
1000
800
600
400
200
0
-40
MP2606 Rev. 1.0
1/25/2010
Vbat=4V
Vbat=3.6V
-20
0
20
40
60
80
www.MonolithicPower.com
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© 2010 MPS. All Rights Reserved.
5
MP2606 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O TRICKLE CHARGE
BLOCK DIAGRAM
IN
RBFH
I BFH
VIN
CIN
1
5
BATT I
BATT
10
SS
CSS
I SET
CHG
7
+
VBATT
_
COUT
2
BATTERY
CHARGE
CONTROL
9
RCHG
ACOK
I BFL
3
8
RBFL
4
OFF ON
6
EN
GND
Figure 1—Functional Block Diagram
OPERATION
Input Voltage Range
The MP2606 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 7.0V.
The open-drain pin ACOK is used to indicate
an input power good condition (i.e.
2.5V<VIN<7.0V). If the input voltage is lower
than the battery voltage, the IC is also disabled
to prevent the battery from draining.
Charge Cycle (Mode Change: CC-> CV)
Figure 2 below shows the typical charging
profile for the MP2606. Figure 3 shows the
typical charging procedure. For a depleted
battery the MP2606 will start with 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 (IBFL). After
battery full is asserted, the output current needs
to reach IBFH threshold to re-assert ”In-charge”
status.
The MP2606 can start up with heavy load and
is stable without a battery connected to the
BATT pin.
MP2606 Rev. 1.0
1/25/2010
www.MonolithicPower.com
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© 2010 MPS. All Rights Reserved.
6
MP2606 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O TRICKLE CHARGE
Table 1—RCHG and ICHG Relationship
IBATT
CC
Charging
ICHG
RCHG (kΩ)
1.82
2
2.16
2.5
3.32
4.32
5
7.5
8.45
10
CV
Charging
IBFL
Charging
Complete
10% of ICHG
VBATT
2.6V
4.2V
Figure 2—MP2606 Typical Charging Profile
VBATT
IBATT
Soft-Start
Time
VBATT
4.2V
Charge Current vs
1/RCHG Resistance
ICHG
90% of ICHG
10% of ICHG (IBFL)
CHG
Charge
Start
CC
Mode
CV
Mode
Charge
End
Figure 3—MP2606 Typical Charging
Procedure
Battery Over-Voltage Protection and
Automatic Recharge
At any time when VBATT is 50mV higher than the
trimmed charge target, the MP2606 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.
1000
900
ICHG CURRENT (mA)
IBATT
ICHG (mA)
913
835
778
677
521
410
357
236
208
176
800
700
600
500
400
300
200
100
0
0.00 0.10 0.20 0.30 0.40 0.50 0.60
1/RCHG
Figure 4—Charge Current vs 1/RCHG
Resistance
The recommended resistance for programming
the charge current is 2.3kΩ<RCHG<11kΩ. The
battery full charge current threshold (IBFL) is
programmed by connecting a resistor RBFL from
the IBFL pin to GND:
(1)
IBFL =
1A × 1.7kΩ
R BFL
(2)
IBFH =
1A × 1.7kΩ
R BFH //RBFL
Where 2RCHG<RBFL<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.
MP2606 Rev. 1.0
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
7
MP2606 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O TRICKLE CHARGE
Charge Status Indicator ( CHG )
The MP2606 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 (IBFL),
the CHG pin will become high impedance.
Thermal Protection
The MP2606 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.
MP2606 Rev. 1.0
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
8
MP2606 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O TRICKLE CHARGE
APPLICATION
Flow Chart of Operation
Power-On Reset (POR) feature can be applied
to the MP2606 to ensure that the device starts
operating in a known state. The flow chart in
Figure 4 describes the conditions and operation
modes of the MP2606. CVC and CCC stand for
“constant voltage charge” and “constant current
charge”, respectively.
POR
VUVLO<VIN<7V
NO
VIN
YES
VIN
NO
Enable?
YES
VBAT
Detected?
NO
YES
NO
RCHG
Set up
Charging
Set up?
YES
VCHG
VBAT>4.15V
Charge Mode?
VBAT 4.15V
.
C.C.C
Soft Start
RBF
Set up
NO
ICHG IBF
Battery Full?
TJ>120
YES
?
YES
Soft-Off
TJ<110
?
YES
NO
VCHG
YES
Short
Circuit?
NO
NO
VBAT>4.2V?
NO
VBAT 4.15V?
YES
Figure 5—Flow Chart of Operation
MP2606 Rev. 1.0
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
9
MP2606 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O 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.
MP2606 Rev. 1.0
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
10