FP8103

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.

Rev. 0.70

10/19

Function Description

Operation

The FP8103 is a linear battery charger designed primarily for charging single cell lithium-ion

current. Charging current can be programmed by an external single resistor. The FP8103 includes an

Furthermore, The FP8103 is capable of operating from a USB power source.

Normal Charge Cycle

pin voltage is smaller than 2.9V, the charger enter trickle charge mode. In this mode, the FP8103

supplies approximately 1/10 the programmed charging current to bring the battery voltage up to a safe

level for full current charging. When the BAT pin voltage rises above 2.9V, the charger enters

constant-current mode, where the full programmed charge current is supplied to the battery. When the

BAT pin approaches the final float voltage (4.35V), the FP8103 enters the constant-voltage mode and

the charge current begins to decrease. When the charge current drops to 1/10 of the programmed

value, the charge cycle ends.

Programming Charge Current

The charge current is programmed by a single resistor connected from the PROG pin to ground.

The battery charging current is 1200 times the current flowing out of the PROG pin. The required

resistor value can be calculated from the charge current with following equation:

)

MAX

(

CHG

I

1200

The instantaneous charging current may differ from above equation in trickle or constant voltage

modes. The instantaneous charging current provided to the battery can be determined by monitoring

the PROG pin voltage at any time with the following equation:

1200

×

R

V

PROG

PROG