This battery charger circuit diagram is a very simple high efficiency switchmode battery charger circuit based on the LTC4012 IC , manufactured by Linear Technology Corporation .
This charger support supports Li-Ion/Polymer, NiMH, NiCd and sealed lead acid battery chemistries in single and multicell configurations.
When the LTC4012-3 is charging, the voltage on the PROG
pin varies in direct proportion to the charge current. The nominal PROG voltage is given by: VPROG=(ICHRG x RSENSE x RPROG/RIN) +11.67uAxRPROG
Using the LTC4098 USB Power-Path controller you can design an high efficiency , full-featured Li-Ion Polymer battery charger using few external electronic components . This Li-Ion Polymer battery charger circuit can be used with many power distribution sources like: USB, wall adapter, automotive, Firewire or other high voltage DC/DC converters, and a Li-Ion/Polymer battery.
For automotive and other high voltage applications, the LTC4098 interface with a Linear Technology external switching regulator to provide a high efficiency high voltage power path.
Using the MAX8844 lithium ion charger IC released by Maxim Semiconductors you can design an very simple and efficiency charger circuit for charging a single cell lithium-ion battery .
The MAX8844 lithium ion charger integrate a current-sense circuit, MOSFET pass element, thermal-regulation circuitry, and eliminate the external reverse-blocking Schottky diode to create the simplest and smallest charging solutions for handheld equipment.