MAX6439, MAX6440, MAX6441, MAX6442 Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset

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 V_CC 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 (V_CC) 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 V_BATT 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 V_CC from 1.8V to 3.3V
Available with 150ms (min) and 1.2s (min) V_CC 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

t_RESET

Watchdog Feature

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(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

$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)

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* 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.

MAX6439

Free
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Status

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
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