General Description

The MAX6846–MAX6849 are a family of ultra-low-power battery monitors with integrated microprocessor (µP)

supervisors. The user-adjustable 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 pushbutton.

Features

♦User-Adjustable Thresholds for Monitoring Single-Cell Li+ or Multicell Alkaline/NiCd/NiMH Applications

♦Single and Dual Low-Battery Output Options

♦Independent µP Reset with Manual Reset

♦Factory-Set Reset Thresholds for Monitoring 1.8V to 3.3V Systems

♦Available with 150ms (min) or 1.2s (min) VCC Reset Timeout Period Options

♦150ms (min) LBOTimeout Period

♦Immune to Short-Battery Voltage Transients

♦Low Current (2.5µA, typ at 3.6V)

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

♦Small 8-Pin SOT23 Packages

Applications

Battery-Powered Systems (Single-Cell Li+ or

Multicell NiMH, NiCd, Alkaline)

Cell Phones/Cordless Phones

Portable Medical Devices

Digital Cameras

Pagers

PDAs

MP3 Players

Electronic Toys