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MAX712
Power Battery Management MAX712
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MAX712

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NiCd/NiMH Battery Fast-Charge Controllers

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

Printable Data Sheet Subscribe

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet NiCd/NiMH Battery Fast-Charge Controllers Jul 31, 2013
App Note One-Hour Battery Charger Has Switch-Mode PWM Control
App Note NiMH/NiCd Switchmode Battery Charger Has dV/dt Charge Termination
Tutorial How to Design Battery Charger Applications that Require External Microcontrollers and Related System-Level Issues

Support & Training

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Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX712, MAX713: Typical Operating Circuit MAX712, MAX713: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet NiCd/NiMH Battery Fast-Charge Controllers Jul 31, 2013
App Note One-Hour Battery Charger Has Switch-Mode PWM Control
App Note NiMH/NiCd Switchmode Battery Charger Has dV/dt Charge Termination
Tutorial How to Design Battery Charger Applications that Require External Microcontrollers and Related System-Level Issues

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.