GENERAL DESCRIPTION

The DS2711 and DS2712 are ideal for in-system or stand-alone charging of 1 or 2 AA or AAA NiMH “loose” cells. Temperature, voltage, and charge time are monitored to provide proper fast-charging control algorithms for nickel metal hydride (NiMH) batteries. Battery tests are included to detect defective or inappropriate cells such as alkaline primary batteries. The DS2711/DS2712 support series and parallel topologies, with independent monitoring and control of each cell. Charging of NiCd chemistry cells is also supported.

FEATURES

■ Charge 1 or 2 NiMH Cells

■ Detect and Avoid Charging Alkaline Cells

■ Precharge Deeply Depleted Cells

■ Fast Charge NiMH with -∆V Termination Sensitivity of 2mV (typ)

■ Monitor Voltage, Temperature, and Time for Safety and Secondary Termination

■ Regulate Charge Current: Linear Control (DS2711) Switch-Mode Control (DS2712)

■ Drive pMOS or pnp-Type Pass Element or Switch, or an Optocoupler

■ Compatible with Popular Optocouplers and Integrated Primary-Side PWM Controllers

■ Small 16-Pin SO or TSSOP Packages

APPLICATIONS

    Desktop/Stand-Alone Chargers (AAA/AA)

    Digital Still Cameras

    Music Players

    Games

    Toys