Loose-Cell NiMH Chargers

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.

Applications

* Desktop/Stand-Alone Chargers (AAA/AA) * Digital Still Cameras * Gaming * Music Players * Toys

* Charge 1 or 2 NiMH Cells

* Detect and Avoid Charging Alkaline Cells

* Precharge Deeply Depleted Cells

* Fast Charge NiMH with -ΔV 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 Package