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Maxim > Products > [Supervisors, Voltage Monitors, Sequencers] 
MAX6439, MAX6440, MAX6441, MAX6442
Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 256kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

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.

The MAX6439–MAX6442 are offered with several factory-trimmed low-battery threshold combinations ideal for single-cell lithium-ion (Li+) or multicell alkaline/NiCd/NiMH applications. When the battery voltage drops below each specified low threshold, the low-battery outputs are asserted to alert the system. When the voltage rises above the specified high thresholds, the outputs are deasserted after a 150ms minimum timeout period, ensuring the voltages have stabilized before power circuitry is activated or providing microprocessor reset timing. The low and high thresholds provide hysteresis in battery-operated systems to eliminate output chattering.

The MAX6439/MAX6440 offer factory-trimmed battery monitors with a single output. The MAX6441/MAX6442 offer factory-trimmed battery monitors with dual outputs. All battery monitors have open-drain low-battery outputs.

The MAX6439–MAX6442 monitor system voltages (VCC) from 1.8V to 3.3V with seven fixed reset threshold options. Each device is offered with two minimum reset timeout periods of 150ms or 1200ms. The MAX6439/MAX6441 are offered with an open-drain active-low RESET output and the MAX6440/MAX6442 are offered with a push-pull active-low RESET output.

The MAX6439–MAX6442 are offered in a SOT23 package and are fully specified over a -40°C to +85°C temperature range.

Key Features   Applications/Uses
  • 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 Active-Low 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

 
  		• Battery-Powered Systems (Single-Cell Li+ or Multicell NiMH, NiCd, Alkaline)
  		• Cell Phones/Cordless Phones
  		• Electronic Toys
  		• MP3 Players
  		• Pagers
  		• PDAs
  		• Portable Medical Devices

    Key Specifications:  Supervisors (1 Monitored Voltage)
    Part Number Reset Thresh.
    (V)    		 Reset Out tRESET Watchdog Feature Supervisor Features Reset Thresh. Accur.
    (%)    		 ICC
    (µA)    		 Price
    Active Low min @ +25°C max See Notes
    MAX6439 
    1.2 to 1.8
    1.8 to 2.5
    2.5 to 3.3
    3.3 to 5.5
    		 Open Drain
    85ms to 300ms
    >1s
    		 No Watchdog
    Manual Reset
    Power Fail Comparator/Low Battery Detect
    		 2.5 2.5 $1.30 @1k
    MAX6440  Push-Pull $1.30 @1k
    MAX6441  Open Drain $1.63 @1k
    MAX6442  Push-Pull $1.63 @1k
    See All Supervisors (1 Monitored Voltage) (274)

    Diagram
    MAX6439, MAX6440, MAX6441, MAX6442: Typical Application Circuit
    Typical Application Circuit

    Application Notes
  		• Application Note 966: Low Battery Monitor Delays System Shutdown - MAX6439

    Design Guides
  		• Microprocessor Supervisory (PDF)

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


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    MAX6439 Free
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    		Temp RoHS/Lead-Free?
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    Filter:
    Devices: 1-100 of 5392
    1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20  --->


    More Information
  		• Topmark Coding: MAX6439 MAX6440 MAX6441 MAX6442
  		• New Product Press Release 2002-10-03 

    Related Products
    MAX6427, MAX6428, MAX6429, MAX6430, MAX6431, MAX6432, MAX6433, MAX6434, MAX6435, MAX6436, MAX6437, MAX6438 Low-Power, Single/Dual-Level Battery Monitors with Hysteresis

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    Document Ref.: 19-2535; Rev 1; 2006-04-03
    This page last modified: 2009-07-13


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