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General Description

The MAX6439–MAX6442 are a family of ultra-low-power battery monitors with integrated microprocessor (μP) supervisors. The battery monitors are offered with single or dual low-battery output options that can be used to signal when the battery is OK (enabling full system operation), when the battery is low (for low-power system operation), and when the battery is dead (to disable system operation). These devices also have an independent μP supervisor that monitors VCC and provides an active-low reset output. A manual reset function is available to reset the μP with a push-button. No external components are required.

Features

? Factory-Trimmed VBATT Threshold Options for

?? Monitoring Single-Cell Li+ or Multicell

?? Alkaline/NiCd/NiMH Applications

? Immune to Short Battery Voltage Transients

? Low Current (2.5μA typ at 3.6V)

? Single and Dual Low-Battery Output Options

? 150ms Minimum LBO Timeout Period

? Independent μP Reset with Manual Reset

? Factory-Set Reset Thresholds for Monitoring VCC

?? from 1.8V to 3.3V

? Available with 150ms (min) and 1.2s (min) VCC

?? Reset Timeout Period Options

? -40°C to +85°C Operating Temperature Range

? Small 6- and 8-Pin SOT23 Packages

? No External Components

Applications

?? Battery-Powered Systems (Single-Cell Li+ or Two-/Three-Cell NiMH, NiCd, Alkaline)

?? Cell Phones/Cordless Phones

?? Portable Medical Devices

?? Electronic Toys

?? Pagers

?? PDAs

?? MP3 Players