LM3621 - National Semiconductor

LM3621 Single Cell Lithium-Ion Battery Charger Controller

The LM3621 is a full function constant voltage, constant current (CVCC) lithium-ion (Li+) battery charger controller. It provides 1% regulation accuracy over the specified temperature range without requiring the use of external precision resistors. The IC controls five charge modes: conditioning, fast, top-off, monitor and maintenance. In addition, the LM362.

Features

Automatic end-of-charge control Preset or user adjustable charge current regulation LED drivers for charging status and fault indication Battery self-discharge refresh (maintenance) Overvoltage/overcurrent fault detection and protection Defective battery pack detection Charge current boost control for cellular phone applications n Charge interruption control input n n n n n n n Applications n Complete, full function, protected battery charger for coke or graphite anode, single cell Lithium-Ion battery packs n Linear voltage regulator controlled chargers n High efficiency switching regulator c.