MPS MP26023 28v, 1a linear li-ion battery charger with trickle charge Datasheet

MP26023
28V, 1A Linear
Li-Ion Battery Charger with Trickle Charge
The Future of Analog IC Technology
FEATURES
DESCRIPTION
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The MP26023 is a linear, high-performance
single cell Li-Ion battery charger. By integrating
high voltage input protection into the charger
IC, the MP26023 can tolerate an input surge up
to 28V.
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.
MP26023 is available in 10-pin 3mm x 3mm
QFN packages.
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
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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 - 28V
To system
CIN
1uF
430Ω
IBATT
430Ω
1
2
3
4
ON OFF
R1
500kΩ
5
IN
BATT
CHG
ISET
MP26023
ACOK
IBF
EN
SS
NTC
GND
10
+
VBATT
_
COUT
1uF - 22uF
9
8
7
6
CSS
0.1uF
RBF
20kΩ
RCHG
2.3kΩ
RNTC
100kΩ
MP26023 Rev.0.9
12/14/2009
www.MonolithicPower.com
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© 2009 MPS. All Rights Reserved.
1
MP26023 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
ORDERING INFORMATION
Part Number*
MP26023DQ
Package
QFN10 (3mm x 3mm)
Top Marking
Free Air Temperature (TA)
2UYW
–40°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP26023DQ–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP26023DQ–LF–Z)
PACKAGE REFERENCE
TOP VIEW
IN
1
10
BATT
CHG
2
9
ISET
ACOK
3
8
IBF
EN
4
7
SS
NTC
5
6
GND
EXPOSED PAD
ON BACKSIDE
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
IN to GND ....................................–0.3V to +28V
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 5.5V
Operating Junct. Temp (TJ) ..... -40°C to +125°C
MP26023 Rev.0.9
12/14/2009
(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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© 2009 MPS. All Rights Reserved.
2
MP26023 – 28V, 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
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
VIN = 5V, VBATT = 3.8V
RCHG = 3.3kΩ
Max
Units
µA
4.242
V
0
µA
450
515
580
mA
87
100
113
%ICHG(5)
5
2.85
10
3.0
230
15
3.15
%ICHG(5)
V
mV
10
50
%ICHG(5)
75
1.19
1.23
125
1.27
%IBF(6)
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
400
6.2
V
mV
Constant Current Regulation
ICHG
VIN = 5V, VBATT = 3.8V,
TJ = 0°C to +120°C,
RCHG = 1.6 kΩ to 8.0 kΩ
VIN = 5V, VBATT = 2.3V
Constant Current Variation
Trickle Current
Trickle Threshold Voltage
Trickle Voltage Hysteresis
Battery Full Programming
Range
IBF Accuracy
SS Pin Voltage
Input Over Voltage Protection
OVP Hysteresis
IBF
Refer to Operation section for
programming IBF
CSS = 0.1uF, VBATT = 3.6V
OVP
VIN Rising
2.7
EN Trip Threshold High
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
RON
Soft Thermal Shutdown
Threshold
Soft Thermal Shutdown
Hysteresis
Soft-Start Time
8
mA
1
0.35
105
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.
MP26023 Rev.0.9
12/14/2009
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© 2009 MPS. All Rights Reserved.
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MP26023 – 28V, 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
NTC
6
GND
7
SS
8
IBF
9
ISET
10
BATT
MP26023 Rev.0.9
12/14/2009
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.
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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MP26023 – 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
2.0
IBATT
0.3
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
1
0.8
0.6
0.4
0.2
0
0
40
80
120 160 200
CHARGE TIME (MINUTES)
Battery Voltage vs
Input Voltage
5
1.2
CHARGE CURRENT (A)
BATTERY VOLTAGE (V)
1
2
3
4
BATTERY VOLTAGE (V)
Charge Currents vs
Battery Voltage
4.5
4.3
4.1
3.9
3.7
ICHG=0.43A
3.5
4.5
0
4.8
5.1
5.4
5.8
INPUT VOLTAGE (V)
6.0
1
0.8
0.6
0.4
0.2
0
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.
3
3.2 3.4 3.6 3.8
4
BATTERY VOLTAGE (V)
2ms/div.
MP26023 Rev.0.9
12/14/2009
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© 2009 MPS. All Rights Reserved.
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MP26023 – 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 vs.
RCHG Resistance
16
CHARGE CURRENT (mA)
700
14
660
12
620
10
VBAT=3.7V
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
RNTC vs.
Input Voltage
Reverse Current vs.
Battery Voltage
400
0.02
REVERSE CURRENT (µ A)
TLOW
350
300
250
200
150
100
THIGH
50
0
4.5
200 400 600 800 1000
CHARGE CURRENT (mA)
4.8
5.1
5.4
5.8
INPUT VOLTAGE (V)
0.01
VIN=0V
0
6.0
2.5
2.9
3.3
3.7
4.1
BATTERY VOLTAGE (V)
4.5
640
4.3
620
4.25
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)
Battery Voltage vs.
Temperature
600
580
560
540
520
500
-50 -30 -10
MP26023 Rev.0.9
12/14/2009
10
30
50
70
90
4.2
4.15
4.1
4.05
4
-50 -30 -10
10
30
50
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© 2009 MPS. All Rights Reserved.
70
90
6
MP26023 – 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 MP26023 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.
MP26023 Rev.0.9
12/14/2009
Charge Cycle (Mode Change: Trickle -> CC-> CV)
Figure 2 below shows the typical charging
profile for the MP26023. Figure 3 shows the
typical charging procedure. For a fully depleted
battery with a terminal voltage lower than 3.0V,
the MP26023 will start with the trickle charge
(preconditioning) at 10% of the programmed full
charge current. After the battery voltage
reaches 3.0V, 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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MP26023 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
IBATT
Table 1—RCHG 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
3.0V
4.2V
Figure 2—MP26023 Typical Charging Profile
VBATT
IBATT
Soft-Start
Time
VBATT
4.2V
Charge Current vs.
1/RCHG Resistance
ICHG
90% of ICHG
3.0V
1000
10% of ICHG (IBF)
CHG
Trickle
Charging
CC
Mode
CV
Mode
Charge
End
Figure 3—MP26023 Typical Charging
Procedure
Battery Over-Voltage Protection and
Automatic Recharge
At any time when VBATT is 50mV higher than the
trimmed charge target, the MP26023 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.
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/RCHG
Resistance
=
k
7
F
.
B
1
R
A
1
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:
F
MP26023 Rev.0.9
12/14/2009
900
IB
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.
CHARGE CURRENT (mA)
IBATT
Charge
Start
ICHG (mA)
1000
900
800
700
600
500
400
300
200
100
×
Ω
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
MP26023 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
Charge Status Indicator (CHG)
The MP26023 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 MP26023 has a built-in NTC resistance
window comparator. If configured as the typical
application circuit as indicated in Figure 1, the
MP26023 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 MP26023 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.
JP4
BAT
GND
VIN
GND
CHG
1
2
IN
BATT
CHG
ISET
10
9
MP26023
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
MP26023 Rev.0.9
12/14/2009
www.MonolithicPower.com
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© 2009 MPS. All Rights Reserved.
9
MP26023 – 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 MP26023 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 MP26023. CVC and CCC stand
for “constant voltage charge” and “constant
current charge”, respectively.
J
Figure 6—Flow Chart of Operation
MP26023 Rev.0.9
12/14/2009
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MP26023 – 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.
MP26023 Rev.0.9
12/14/2009
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
11