LTC4001-1

·Handheld Battery-Powered Devices
·Handheld Computers
·Charging Docks and Cradles
·Digital Cameras
·Smart Phones

The LTC^®4001-1 is a 2A Li-Ion battery charger intended for 5V wall adapters. It utilizes a 1.5MHz synchronous buck converter topology to reduce power dissipation during charging. Low power dissipation, an internal MOSFET and sense resistor allow a physically small charger that can be embedded in a wide range of handheld applications. The LTC4001-1 includes complete charge termination circuitry, automatic recharge and a ±1% 4.1V oat voltage. Input short-circuit protection is included so no blocking diode is required.

This 4.1V version of the standard LTC4001 is intended for applications which will be operated or stored above approximately 60. Under these conditions, the reduced oat voltage will trade-off initial cell capacity for the bene test of increased capacity retention over the life of the battery. A reduced oat voltage also minimizes swelling in prismatic and polymer cells, and avoids open CID (pressure fuse) in cylindrical cells.

Battery charge current, charge timeout and end-of-charge indication parameters are set with external components. Additional features include shorted cell detection, temperature quali ed charging and overvoltage protection. The LTC4001-1 is available in a low pro le (0.75mm) 16-lead (4mm *4mm) QFN package.