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