Loose Cell NiMH Chargers

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 -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

APPLICATIONS
Desktop/Stan a-Alone Chargers (AAA/AA)
Digital Still Cameras
Music Players
Games
Toys