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DS2711, DS2712 Loose Cell NiMH Chargers

NiMH Battery Charger Detects and Avoids Charging Alkaline Cells

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Status

Part Number Status

DS2711 Active: In Production.

DS2712 Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Description

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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.

Awards

DS2711: EDAW-NEC Power-Supply Product Award Winner 2005
DS2711 Loose Cell NiMH Linear Charger: EDN Innovation Award, Finalist 2004

An evaluation kit is available: DS2711K, DS2712K

Key Features Applications/Uses

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

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