General Description

The MAX1660 digitally controlled fuel-gauge interface executes two essential functions for rechargeable battery-pack management: fuel gauging and pack overcurrent protection. It accurately monitors a battery pack’s charge and discharge current flow, and records each using two independent, on-board Coulomb counters.

Features

♦ 1 Accuracy over a 600µA to 4A Current Range (RSENSE = 30mΩ)

♦ 5µV Input Offset Voltage (28µV max)

♦ SMBus 2-Wire (Plus Optional Interrupt) Serial Interface

♦ 2.00V Precision System Reference Output

♦ 3.3V Linear-Regulator Output Powers External Circuitry

♦ Two Micropower Shutdown Modes

♦ Independent 32-Bit Charge and Discharge Coulomb Counters

♦ Battery-Overcharge/Overdischarge Protection

♦ Battery Short-Circuit/Overcurrent Protection

♦ On-Board Power MOSFET Drivers

♦ 80µA Quiescent Current

♦ <1µA Shutdown Current

♦ Small 16-Pin QSOP Package (Same Board Area as 8-Pin SO)

Applications

Smart-Battery Packs

Battery-Pack Overcurrent Protection

Industrial-Control System Interfaces

Battery-Pack Fuel Gauging

Digital Current-Sense Instrumentation

Analog-to-Digital Conversion