MAX1789

Advanced, Smart Battery-Pack Controllers

Industry's Smallest SBS-Compliant Battery Fuel Gauge with nFET Protection Drivers

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Overview

Accurate Fuel Gauge Uses V-to-F Method
- < 1µV Input Offset Voltage
- < 1% Gain Error
- 139nAh Resolution (5mΩ)
- No Calibration Required
8-Bit RISC Microcontroller Core
8kB of Program Flash
12kB of Program ROM
512 Bytes of Data Flash
648 Bytes of RAM
12-Bit ADC
Watchdog Timer
In-System Debug
Eliminates Separate Primary-Protection IC
- Individual Cell-Voltage Measurements with 0.5% Accuracy
- n-Channel MOSFET Gate Drivers
- Low-Current Charge Pump
- 8% Accurate Overcurrent Protection
- Programmable Overcurrent Delay Timers
3-Pin, 6-LED PWM Driver (Only for MAX1789)
Random-Number Generator (RNG) for Encryption
SMBus v1.1 Compliant with Master Capability
Typical Operating Current < 250µA
Typical Shutdown Current < 10nA
Integrated 32kHz Oscillator: No Crystal
Fully Integrated LDO (V_IN = +4V to +25V)

The MAX1789/MAX17892 smart battery-pack controllers integrate a user-programmable microcontroller core, a coulomb-counting fuel gauge, a multichannel data-acquisition unit, and a system management bus (SMBus™) v1.1-compliant master/slave SMBus interface. The 8-bit, RISC microcontroller core has an integrated 8kB of user-programmable flash and a 12kB program ROM library, which provides battery-pack designers with complete flexibility in developing fuel gauging and control algorithms. The MAX1789/MAX17892 are equipped with in-system debug (ISD) capability for efficient development and debugging.

The MAX1789/MAX17892 include a 12-bit data-acquisition unit to measure individual cell voltages, thermistors, current, and pack voltage. 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 MAX1789/MAX17892 have a wide +4V to +25V operating voltage range. The MAX1789/MAX17892 are available in a lead-free, 28-pin TSSOP package. The MAX1789/MAX17892 evaluation kit is available to assist with development.

Applications