General Description

The MAX712/MAX713 fast-charge Nickel Metal Hydride (NiMH) and Nickel Cadmium (NiCd) batteries from a DC source at least 1.5V higher than the maximum battery voltage. 1 to 16 series cells can be charged at rates up to 4C. A voltage-slope detecting analog-to-digital converter, timer, and temperature window comparator determine charge completion.

Features

♦ Fast-Charge NiMH or NiCd Batteries

♦ Voltage Slope, Temperature, and Timer Fast-Charge Cutoff

♦ Charge 1 to 16 Series Cells

♦ Supply Battery’s Load While Charging (Linear Mode)

♦ Fast Charge from C/4 to 4C Rate

♦ C/16 Trickle-Charge Rate

♦ Automatically Switch from Fast to Trickle Charge

♦ Linear or Switch-Mode Power Control

♦ 5µA (max) Drain on Battery when Not Charging

♦ 5V Shunt Regulator Powers External Logic

Applications

    Battery-Powered Equipment

        Laptop, Notebook, and Palmtop Computers

        Handy-Terminals

        Cellular Phones

    Portable Consumer Products

        Portable Stereos

        Cordless Phones