LTC1558CS-3.3

Charge Controller NiCD Pack 330mA 1.2V 16Pin SOIC N

DESCRIPTION

The LTC®1558 is a backup battery controller that provides all the functions necessary to implement a backup power supply using a single NiCd cell. It includes a 1.2V boost converter, an intelligent 2-stage battery charger, auto matic backup switching and a microprocessor reset generator. The boost converter uses a synchronous switching architecture to achieve a typical efficiency of 70%, ensuring maximum backup lifetime from a small NiCd cell.

FEATURES

■ Complete Battery Backup System in an SO-8, 16-Pin GN or SO Package

■ Generates Adjustable Backup Voltage from a Single 1.2V NiCd Button Cell

■ Automatic Main Supply to Backup Switching

■ Minimum 100mW Output Power

■ Automatic Fast Recharge of NiCd Battery

■ Programmable NiCd Trickle Charge Current

■ Smart NiCd Charger Minimizes Recharge Time and Maximizes System Efficiency After Backup

■ On-Chip Power-On Reset

■ Pushbutton Reset Input

■ Reset Assertion Guaranteed at VCC= 1V

■ Short-Circuit Protection

■ Thermal Limiting

APPLICATIONS

■ Notebook Computers

■ Palmtop Computers/PDAs

■ Portable Instruments

■ Battery-Powered Systems