DESCRIPTION
The LTC®4052 is a complete standalone pulse charger with integrated MOSFET for 1-cell lithium-ion batteries.
An external sense resistor provides overcurrent 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
■ Very Low Power Dissipation: 350mW at 1A
■ Complete Standalone Pulse Charger for 1-Cell Lithium-Ion Batteries
■ Requires No Microcontroller, MOSFET or Blocking Diode
■ Sense Resistor Limits Maximum Current for Safety
■ Programmable Charge Termination Timer for Maximum Capacity Charging
■ ±1% Float Voltage Accuracy
■ Near End-of-Charge (C/10) Detection Output
■ AC Wall Adapter Present Output
■ Low Battery Drain when Input Supply Is Removed
■ Automatic Trickle Charge for Low Battery
■ Automatic Battery Refresh
■ Thermal Shutdown Protection
■ Tiny Thermally Enhanced MSOP Package

APPLICATIONS
■ Handheld Computers
■ Cellular Telephones
■ Cradle Chargers