NiMH Battery Pack Charge Controller

1- to 10-cell NiMH battery-pack charge controller. Regulates current through either linear control or switch-mode control.

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The DS2715 is well suited for cost-sensitive charger applications where the battery pack is either internal or external to the application. It has been optimized for safe and reliable charging of 1 to 10 NiMH cells in series. The internal gain block can be selected as either a comparator or transconductance amplifier for charge current regulation. This makes the DS2715 configurable as a switched DC charger, a linear current regulator, or a switch-mode current source. The DS2715 pre-conditions severely depleted cells before entering full charge mode. It terminates full charge using the dT/dt technique, which requires an external sensing thermistor. Over-temperature, under-temperature, and over-voltage detection prevents charging under unsafe conditions. A user selectable charge timer allows charge rates from 0.167C to 2C. FAST-CHARGE, TOPOFF and DONE modes are included for highly reliable, safe charging of NiMH cells. Discharge mode allows the DS2715 to enter a low power sleep state while the cell pack is being discharged.
DS2715: Operational Diagram DS2715: Operational Diagram Enlarge+

Key Features

  • Charges 1 to 10 NiMH Cells
  • FAST-CHARGE up to a 2C Rate
  • PRECHARGE and TOPOFF Charge Modes Help Cell Conditioning
  • Load Detection Allows the DS2715 to Enter Low Power Sleep Mode (Less than 10µA) while the Cell Pack is Discharged
  • dT/dt Charge Termination Eliminates Cell Charge Stress
  • Monitors Voltage, Temperature, and Time for Safety and Secondary Termination
  • Regulates Current through Either Linear Control or Switch-Mode Control
  • LED Output Displays Charge State
  • Small 16-Pin SO Package


  • Handheld Gaming
  • Handheld POS Terminals
  • Portable DVD Players
  • Portable Television Sets
  • Test Equipment
Part NumberProtected VIN
Charging VIN
Charge Rate Set byCharge TerminationCharge RegulationOper. Temp.
maxmaxSee Notes
DS2715 16.516.5ResistordT/dt
-20 to +85
SOIC (N)/16
$2.53 @1k
See All Battery Chargers (74)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

DS2715KLINEAR: Evaluation Kit for the DS2715
DS2715KSWITCH: Evaluation Kit for the DS2715
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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