EUP8054 Li-ion charger

A very simple Li-ion charger circuit can be designed using the EUP8054 integrated circuit which is a complete constant-current ,constant voltage linear charger for single cell lithium-ion batteries.

The EUP8054 Li-ion charger use few external components and can be used in many portable applications like mp3s , mobile phones , PDAs or other portable devices .
The charge voltage is fixed at 4.2V and the charge current can be programmed using an externally single resistor. The EUP8054 automatically terminates the charge cycle when the charge current drops to 1/10th .

This lithium-ion charger circuit will provide an output current of 600mA an require a input voltage from 4.5 to 6.5 volts .
The battery charge current is 1000 times the current out of the PROG pin and the
program resistor and the charge current are calculated using the following equations:
ICHG=1000V/RPROG,RPROG=1000V/ICHG ;
The charge current out of the BAT pin can be determined at any time by monitoring the PROG pin voltage using the following equation:
IBAT=(VPROG/RPROG)1000