NiCd/NiMH Battery Fast-Charge Controllers

Charges 1-16 Series Cells at Rates Up to 4C

Please check latest availability status for a specific part variant.


The MAX712/MAX713 fast-charge Nickel Metal Hydride (NiMH) and Nickel Cadmium (NiCd) batteries from a DC source at least 1.5V higher than the maximum battery voltage. 1 to 16 series cells can be charged at rates up to 4C. A voltage-slope detecting analog-to-digital converter, timer, and temperature window comparator determine charge completion. The MAX712/MAX713 are powered by the DC source via an on-board +5V shunt regulator. They draw a maximum of 5µA from the battery when not charging. A low-side current-sense resistor allows the battery charge current to be regulated while still supplying power to the battery's load.

The MAX712 terminates fast charge by detecting zero voltage slope, while the MAX713 uses a negative voltage-slope detection scheme. Both parts come in 16-pin DIP and SO packages. An external power PNP transistor, blocking diode, three resistors, and three capacitors are the only required external components.

The evaluation kit is available: Order the MAX712EVKIT-DIP for quick evaluations of the linear charger.
MAX712, MAX713: Typical Operating Circuit MAX712, MAX713: Typical Operating Circuit Enlarge+

Key Features

  • Fast-Charge NiMH or NiCd Batteries
  • Voltage Slope, Temperature, and Timer Fast-Charge Cutoff
  • Charge 1 to 16 Series Cells
  • Supply Battery's Load While Charging (Linear Mode)
  • Fast Charge from C/4 to 4C Rate
  • C/16 Trickle-Charge Rate
  • Automatically Switch from Fast to Trickle Charge
  • Linear Mode Power Control
  • 5µA (max) Drain on Battery when Not Charging
  • 5V Shunt Regulator Powers External Logic


  • Cellular Phones
  • Cordless Phones
  • Handy-Terminals
  • Laptop, Notebook, and Palmtop Computers
  • Portable Stereos

MAX713SWEVKIT: Evaluation Kit for the MAX713 (Switching Applications)
Product Reliability Reports: MAX712.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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.

Quality Management System >
Environmental Management System >


Related Resources

4.5V to 60V, Synchronous Step-Down Supercapacitor Charger Controller

  • Optimized Feature Set for Supercapacitor Charging
  • Reliable Operation in Adverse Environmental Conditions

3.15A USB Type-C Autonomous Charger for 1-Cell Li+ Batteries

  • Up to 16V Protection
  • 13.7V Maximum Input Operating Voltage
  • 3.15A Maximum Charging Current

23VIN 3.2AOUT USB-C Buck-Boost Charger with Integrated FETs for 2S Li-Ion Batteries

  • 3.5V to 23V Input Operating Range, 30VDC Withstand Voltage
  • Reverse Leakage Protection
  • 50mA to 3.15A Programmable Input Current Limit

2S-4S ModelGauge m5 EZ Fuel Gauge with Protector, Internal Self-Discharge Detection, and SHA-256 Authentication

  • Battery Health + Programmable Safety/Protection
  • ModelGauge m5 EZ Algorithm
  • Precision Measurement Without Calibration

12-Channel High-Voltage Data Acquisition System

  • AEC-Q100 Grade 2 Temperature Range
  • Operating Voltage from 9V to 65V
  • Ultra-Low-Power Operation