Lithium polymer charger using LTC4095

Using LTC4095 complete constant-current, constant voltage linear charger can be designed a very simple compact and high efficiency charger for single-cell lithium-ion polymer batteries.
Using the LTC4095 can be designed a simple , low cost charger well-suited for portable USB power applications.

Up to 950mA of charge current may be programmed via a single resistor from the PROG pin to ground. The HPWR pin allows the charge current to be set at 20% or 100% of its full-scale programmed value. An internal safety timer terminates charge current.

The final float voltage is preset to 4.2V and held to a tight 0.5% tolerance. Also featured is an NTC thermistor input to monitor battery temperature while charging, a C/10 current detection output, automatic recharge, bad-battery detection and low-battery trickle charge.
The input power supply required by this charger is from 4.3 to 5.5 volts and the supports up to 7 volts transient .
The charging current that is provided by this lithium-ion polymer charger project is around 500 mA .