DESCRIPTION
The LTC®4052 is a complete standalone pulse charger with integrated MOSFET for 1-cell lithium-ion batteries.
An external sense resistor provides maximum charge current limiting as a safety precaution against a user connecting a wall adapter with the incorrect or no current limit. The internal MOSFET prevents reverse battery current from flowing if the input voltage is shorted to ground, eliminating the need for a blocking diode.

FEATURES
■ Complete Standalone Pulse Charger for 1-Cell Lithium-Ion Batteries
■ Requires No Microcontroller
■ Internal 0.35Ω NMOS Switch
■ Sense Resistor Limits Maximum Current for Safety
■ Programmable Charge Termination Timer for Maximum Capacity Charging
■ No Blocking Diode Required
■ 1% Float Voltage Accuracy
■ Near End-of-Charge (C/10) Detection Output
■ Low Battery Drain when Input Supply Is Removed
■ Automatic Trickle Charge for Low Battery
■ Automatic Battery Refresh
■ Thermal Shutdown Protection
■ Small 8-Pin Thermally Enhanced MSOP Package

APPLICATIONS
■ Standalone Lithium-Ion Battery Charger
■ Personal Information Appliances
■ Cellular Telephones
■ Cradle Chargers