MAX1785

Smart Battery-Pack Controller

Smallest, Most Efficient and Flexible Notebook Fuel-Gauging Solution


Please check latest availability status for a specific part variant.

Description

The MAX1785 smart battery-pack controller integrates a user-programmable microcontroller core, a Coulomb-counting fuel gauge, a multichannel data-acquisition unit, and an SMBus™ v1.1-compliant master/slave interface. The 8-bit RISC microcontroller core has an integrated 32kB of user-programmable flash, which provides battery-pack designers with complete flexibity in developing fuel gauging and control algorithms. The MAX1785 is equipped with in-system debug (ISD) capability for efficient firmware development and debugging.

The MAX1785 includes a 12-bit data-acquisition unit to measure individual cell voltages, thermistor, instant current, and pack voltage. Individual cell voltage measurements with 0.5% accuracy and overcurrent protection allow the MAX1785 to eliminate a separate first-level protection IC. Internally adjustable overcurrent thresholds and delay timers provide a flexible solution.

The integrating fuel gauge module provides a typical input offset of less than 1µV and gain accuracy of better than 1% with no trimming required during pack manufacture. The MAX1785 has a wide 4V to 25V operating voltage range. The MAX1785 is available as a 38-pin TSSOP. The MAX1785 EV kit is available to assist with development.

Key Features

  • Accurate Fuel Gauge Uses V-to-F Method
  • 8-Bit RISC Microcontroller Core
  • 32kB of Program Flash
  • 512 Bytes of Data Flash
  • 776 Bytes of RAM
  • 12-Bit ADC
  • Watchdog Timer
  • In-System Debug for Firmware Debugging
  • Integrated Development Environment

Applications/Uses

  • Notebook Battery Packs
  • Proprietary Battery Packs
  • Remote Data Logging
Product Reliability Reports: MAX1785.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 >

 
Status:
Package:
Temperature:

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