MPS MP26060 1a linear li-ion battery charger with trickle charge Datasheet

MP26060
1A Linear
Li-Ion Battery Charger with Trickle Charge
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP26060 is a linear, high-performance
single cell Li-Ion battery charger. By integrating
high voltage input protection into the charger IC,
the MP26060 can tolerate an input surge up to
24V.
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.
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MP26060 is available in a 10-pin 3mm x 3mm
QFN package.
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Input Surge Up to 24V
Adapter or USB Input
4.15V Output for Safe Charge
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 10-Pin QFN (3mm x 3mm) Package
APPLICATIONS
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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 - 24V
To system
IBATT
CIN
1uF
1
2
3
ON OFF
4
5
MP26060 Rev.0.9
1/14/2010
IN
BATT
CHG
ISET
MP26060
ACOK
IBF
EN
SS
NC
GND
10
+
VBATT
_
COUT
1uF - 22uF
9
8
7
6
CSS
0.1uF
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1
MP26060 – 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
ORDERING INFORMATION
Part Number*
MP26060EQ
Package
QFN10 (3mm x 3mm)
Top Marking
Free Air Temperature (TA)
4SYW
–20°C to +85°C
For Tape & Reel, add suffix –Z (e.g. MP26060EQ–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP26060EQ–LF–Z)
PACKAGE REFERENCE
TOP VIEW
IN
1
10
BATT
CHG
2
9
ISET
ACOK
3
8
IBF
EN
4
7
SS
NC
5
6
GND
EXPOSED PAD
ON BACKSIDE
CONNECT TO
GND PIN
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
IN to GND ....................................–0.3V to +24V
All Other Pins to GND .................–0.3V to +6.5V
(2)
Continuous Power Dissipation (TA = +25°C)
………………………………………………....2.5W
Junction Temperature ...............................140°C
Lead Temperature ....................................260°C
Storage Temperature.............. –65°C to +150°C
QFN10 (3mm x 3mm) .............50 ...... 12 ... °C/W
Recommended Operating Conditions
(3)
Nominal Supply Voltage VIN ............3.5V to 6.5V
Operating Junct. Temp (TJ) ..... -20°C to +125°C
MP26060 Rev.0.9
1/14/2010
(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 PCB.
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2
MP26060 – 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
ELECTRICAL CHARACTERISTICS
VIN = 5V, VEN = 0V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Supply Current
Over
Input
Protection
OVP Hysteresis
ISUPPLY
Voltage
Typ
EN = High
40
EN = Low, ICHG = 0A
500
VIN Rise
6.8
7.0
Max
Units
7.2
V
400
Maximum input voltage
Battery Voltage Regulation
Battery
Protection
Constant
Regulation
OVP
Min
Over-Voltage
Current
DC
VBATT
Leakage < 500 µA
24
V
TA = +25°C, IBATT = 0
4.129
4.15
4.171
V
TA = –5°C to +75°C, IBATT = 0
4.108
4.15
4.192
V
0
µA
IBATT_OVP VBATT = 4.20V
ICHG
mV
VIN = 5V, VBATT = 3.8V
RCHG = 3.3kΩ
VIN = 5V, VBATT = 3.8V,
TJ = 0°C to +120°C,
RCHG = 1.6 kΩ to 8.0 kΩ
VIN = 5V, VBATT = 2.3V
450
515
580
mA
87
100
113
%ICHG(5)
5
2.45
10
2.6
100
15
2.75
%ICHG(5)
V
mV
10
50
%ICHG(5)
Input ACOK Up Range
75
1.19
6.8
1.23
7.0
125
1.27
7.2
%IBF(6)
V
V
Input ACOK Low Range
1.8
2.5
3.2
V
EN Trip Threshold High
2.7
Constant Current Variation
Trickle Current
Trickle Threshold Voltage
Trickle Voltage Hysteresis
Battery Full Programming
Range
IBF Accuracy
SS Pin Voltage
IBF
Refer to Operation section for
programming IBF
CSS = 0.1uF, VBATT = 3.6V
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
Switch-On Resistance
Soft Thermal
Threshold
Soft Thermal
Hysteresis
Soft-Start Time
RON
Shutdown
8
mA
1
0.35
105
Shutdown
120
10
20
µA
Ω
135
10
From trickle to 90% of full current,
CSS = 0.1µF
V
°C
°C
35
ms
Notes:
5) ICHG is the target preprogrammed charge current (Die temperature below 110°C).
6) IBF is the target preprogrammed battery full current threshold.
MP26060 Rev.0.9
1/14/2010
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3
MP26060 – 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
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
EN
5
6
7
Description
Open-Drain Input ACOK Indicator. This pin is low if the voltage at the IN pin is between
2.5V and 6.5V.
Charger IC Enable. An input “Low” signal at this pin or if the pin is floating will enable the
IC.
No connection pin
NC
Exposed Pad
Ground. Connect exposed pad to the GND pin
GND
Soft-Start Timer. Connect this pin to an external capacitor to program the soft-start
C
SS
startup time using the equation: TSS = SS × 20m sec .
0.1μF
8
IBF
9
ISET
10
BATT
MP26060 Rev.0.9
1/14/2010
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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4
MP26060 – 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.
4.5
0.8
4.0
VBATT
0.7
3.5
0.6
3.0
0.5
2.5
0.4
2.0
IBATT
0.3
1.5
0.2
1.0
0.1
0.5
0
0
20
40 60 80 100 120
CHARGE TIME (MINUTES)
1.2
CHARGE CURRENT (A)
0.9
BATTERY VOLTAGE (V)
CHARGE CURRENT (A)
Charge Current vs
Battery Voltage
0
RCHG=1.69K
1.0
0.8
0.6
RCHG=2.87K
0.4
RCHG=8.66K
0.2
0
0.0
Battery Voltage vs
Input Voltage
1.0
2.0
3.0
4.0 5.0
BATTERY VOLTAGE (V)
Charge Currents vs
Battery Voltage
4.5
1.2
4.3
1.0
CHARGE CURRENT (A)
BATTERY VOLTAGE (V)
RCHG=1.69K
4.1
3.9
3.7
3.5
4.5
ICHG=0.87A
4.8
5.1
5.4
5.7
INPUT VOLTAGE (V)
6.0
0.8
0.4
RCHG=8.66K
0.2
0
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.
MP26060 Rev.0.9
1/14/2010
RCHG=2.87K
0.6
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5
MP26060 – 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 vs
RCHG Resistance
18
CHARGE CURRENT (mA)
700
16
660
14
12
620
VBAT=3.7V
10
8
580
6
VBAT=3.8V
4
540
2
500
4.3 4.4 4.5 4.6 4.7 4.8 4.9
INPUT VOLTAGE (V)
0
5
0
200 400 600 800 1000
CHARGE CURRENT (mA)
Reverse Current vs
Battery Voltage
900
CHARGE CURRENT (mA)
REVERSE CURRENT (μ A)
0.02
0.01
VIN=0V
0
2.5
2.9
3.3
3.7
4.1
BATTERY VOLTAGE (V)
4.5
880
860
840
820
800
-50 -30 -10
10
30
50
70
90
Battery Voltage vs
Temperature
BATTERY VOLTAGE (V)
4.25
4.21
4.17
4.13
4.09
4.05
-50 -30 -10
MP26060 Rev.0.9
1/14/2010
10
30
50
70
90
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© 2010 MPS. All Rights Reserved.
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MP26060 – 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
BLOCK DIAGRAM
IN
VIN
CIN
1
BATT I
BATT
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 MP26060 has built-in input voltage surge
protection up to +24V. The charger IC will be
automatically disabled when the input voltage is
lower than 2.5V or higher than 6.5V. The opendrain pin ACOK is used to indicate an input
power good condition (i.e. 2.5V<VIN<6.5V). If
the input voltage is lower than the battery
voltage, the IC is also disabled to prevent the
battery from draining.
MP26060 Rev.0.9
1/14/2010
Charge Cycle (Mode Change: Trickle -> CC-> CV)
Figure 2 below shows the typical charging
profile for the MP26060. Figure 3 shows the
typical charging procedure. For a fully depleted
battery with a terminal voltage lower than 2.6V,
the MP26060 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
4.15V, 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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7
MP26060 – 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
IBATT
CC
Charging
ICHG
CV
Charging
IBF
Charging
Complete
Trickle
Charging
10% of ICHG
VBATT
2.6V
4.15V
RCHG (kΩ)
2.43
2.80
3.4
4.22
5.6
ICHG (mA)
700
600
500
400
300
Table 1—RCHG and ICHG Relationship
Figure 2—Typical Charging Profile
CHG
VBATT
IBATT
Soft-Start
Time
VBATT
4.15V
ICHG
90% of ICHG
2.6V
IBATT
10% of ICHG (IBF)
CHG
Charge
Start
Trickle
Charging
CC
Mode
CV
Mode
Charge
End
Figure 3—Typical Charging Procedure
Battery Over-Voltage Protection and
Automatic Recharge
At any time when VBATT is 50mV higher than the
trimmed charge target, the MP26060 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.
See Table 1 and Figure 4. The relationship of
the charge current and the programming
resistance is established by:
I CHG =
MP26060 Rev.0.9
1/14/2010
1A × 1.7kΩ
RCHG
CHG
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 (IBF) is
programmed by connecting a resistor RBF from
the IBF pin to GND:
I BF =
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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8
MP26060 – 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
Charge Status Indicator (CHG)
The MP26060 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.
The ACOK and CHG can be used to drive
LEDs ( Figure 1) or to interface with the system.
When interfacing with the system, glitches may
occur on the power supply input (IN) when the
AC-power adapter is plugged in and out. It is
desirable to blank the glitches so that the
system can properly operate with AC power
adaptor. A simple Solution is to add the RC
filter (C5 and C6)on the pin ACOK / CHG as
shown in Figure 5. The size of C5 and C6
depends on the width of the glitch and the rise
time of the interface.
Thermal Protection
The MP26060 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
saw-tooth 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.
Vc c
R2
VIN
R1
1
C1
C2
C6
2
C HG
AC OK
EN
3
C5
4
5
IN
C HG
AC OK
B ATT
MP26060
IS ET
IB F
SS
VB AT
10
C4
9
GND
8
7
EN
NC
GND
R5
6
R6
C3
Figure 5—Filtered Charge Status & Input Power Good Interface
MP26060 Rev.0.9
1/14/2010
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9
MP26060 – 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
APPLICATION
Flow Chart of Operation
Power-On Reset (POR) feature can be applied
to the MP26060 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 MP26060. CVC and CCC stand
for “constant voltage charge” and “constant
current charge”, respectively.
Figure 6—Flow Chart of Operation
MP26060 Rev.0.9
1/14/2010
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© 2010 MPS. All Rights Reserved.
10
MP26060 – 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.
MP26060 Rev. 0.9
1/14/2010
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MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
11