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Single-chip, battery-pack controller

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MAXIM Integrated Products, represented by Arrow , has introduced the MAX1781 advanced battery-pack controller.

This IC is a programmable, smart battery-pack supervisor that integrates a microcontroller core, program memory (EEPROM), a Coulomb counter based fuel gauge, a multichannel data acquisition unit, and a master/slave SMBus interface.

The 8-bit, RISC microcontroller core is user-programmable and provides battery-pack designers with flexibility for developing fuel gauging and control algorithms.

The data-acquisition unit can measure individual cell voltages to within 25mV, total battery-stack voltage (up to 20.48V), and internal/external chip temperature. Combined with user-adjustable over-current comparators, these features eliminate the need for separate primary-pack protection IC.

The controller is a high-voltage IC that can directly connect to between two- and four-series lithium-ion (Li+) cells and supply itself through a fully integrated 3.4V low-dropout linear regulator.

With a high level of integration and no separate primary-protection IC or linear regulator, the MAX1781 provides a small, advanced, programmable battery-pack solution.

An advanced-software development toolset, which includes an optimised C-compiler, an in-circuit emulator (ICE), and an SMBus monitor accessible from an integrated-development environment, allows the user to easily implement and debug advanced battery-pack fuel gauging and control software.

The MAX1781 is available in a 7mm x 7mm 48-pin TQFN package and is specified for the extended-industrial temperature range (-40°C to +85°C).

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