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FP8101
500mA Linear Li-Ion Battery Charger in SOT23
General Description
The FP8101 is a standalone linear Li-ion battery charger with exposed pad SOT23 package. With
few external components, FP8101 is well suited for a wide range of portable applications. Charging
current can be programmed by an external resistor. In standby mode, supply current will be reduced to
around 55uA. Other features include UVLO, automatic recharge, charge status indicators and thermal
regulation.
Features
Standalone Linear Charger for Single Cell Li-ion Batteries
No External MOSFET, Sense Resistor, or Blocking Diode Required
Up to 0.5A Programmable Charge Current
Preset Charge Voltage with ±1% Accuracy
Automatic Recharge
2.9V Trickle Charge Voltage
C/10 Charge Termination
55uA Standby Supply Current
Charge Status Indicators for No Battery and Charge Failure Display
Soft-Start to Limit Inrush Current
Thermal Protection
Reverse Battery Leakage Protection
Applications
Portable Information Appliances
Charging Docks & Cradles
Cellular Phones & PDAs
Handheld Computers
Typical Application Circuit
VIN
VIN
4
Vcc
FP8101
BAT 3
1
CHRG
5
PROG
GND
2
SOT23-5L
BAT+
BAT-
4
Vcc
FP8101
BAT 3
1
CHRG
5
STDBY
6
PROG
GND
2
SOT23-6L
BAT+
BAT-
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.63
1/14

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Function Block Diagram
STDBY
CHRG
Vin Body
VBAT Switcher
145
TDie
-
+
+
Vcc
-+
FP8101
BAT
2.9V
VBAT
-
+
-
4.1V +
-+
Charging
Control
-+
0.1V
-+
1.0V
+
-
VREF
PROG
GND
Charge Status Indicators
Charge Status
In Charging
Charge Termination
Vcc UVLO
NoBat
CHRG (Red)
ON
OFF
OFF
OFF
STDBY(Green)
OFF
ON
OFF
ON
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.63
2/14

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State Diagram
FP8101
Shutdown Mode
Vcc < VUVLO or
Vcc < VBAT
CHRG=Hi-Impedance
STDBY=Hi-Impedance
VBAT 2.9V
Vcc VUVLO and
Vcc VBAT +0.1V
Check
VBAT
VBAT < 2.9V
Pre-Charge Mode
Charge Current=1/10IBAT
CHRG=Strong Pull-Low
STDBY=Hi-Impedance
VBAT 2.9V
Vcc < VUVLO or
Vcc < VBAT
Constant-Current Charge Mode
Charge Current=IBAT
CHRG=Strong Pull-Low
STDBY=Hi-Impedance
Vcc < VUVLO or
Vcc < VBAT
VBAT > 4.1V
Constant-Voltage Charge Mode
Charge Voltage > 4.1V
CHRG =Strong Pull-Low
STDBY =Hi-Impedance
Vcc < VUVLO or
Vcc < VBAT
Charge Current <1/10IBAT
VBAT < 4.1V
Standby Mode
Charge Termination
CHRG =Hi-Impedance
STDBY=Strong Pull-Low
Vcc < VUVLO or
Vcc < VBAT
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.63
3/14

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Pin Descriptions
SOT23-5L
TOP View
CHRG 1
5 PROG
GND 2
BAT 3
4 Vcc
FP8101
Name
CHRG
GND
BAT
VCC
PROG
No. I / O
Description
1 O Charge State Indicator1
2 P IC Ground
3 P Battery Voltage
4 P Supply Voltage
5 I CC Charge Current Setting & Monitor
SOT23-6L
TOP View
CHRG 1
6 PROG
GND 2
BAT 3
5 STDBY
4 Vcc
Name No. I / O
Description
CHRG 1 O Charge State Indicator1
GND 2 P IC Ground
BAT 3 P Battery Voltage
VCC 4 P Supply Voltage
STDBY 5 O Charge State Indicator2
PROG 6 I CC Charge Current Setting & Monitor
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.63
4/14

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Marking Information
SOT23-5L / SOT23-6L
FP8101
BAXXX
Lot Number
Year
Part Number Code
Lot Number: Wafer lot number’s last two digits
For Example: XX686 86
Year: Production year’s last digit
Part Number Code: Part number identification code for this product. It should be always “BA.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.63
5/14