MAX6847 MAXIM [Maxim Integrated Products], MAX6847 Datasheet

MAX6847

Manufacturer Part Number

MAX6847

Description

Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated UP Reset

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX6847.pdf (12 pages)

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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 V

provides an active-low reset output. A manual reset

function is available to reset the µP with a pushbutton.

The MAX6846–MAX6849 are ideal for single-cell lithium-

ion (Li+) or multicell alkaline/NiCd/NiMH applications.

When the battery voltage drops below each adjusted low

threshold, the low-battery outputs are asserted to alert

the system. When the voltage rises above the adjusted

high thresholds, the outputs are deasserted after a

150ms minimum timeout period, ensuring the voltages

have stabilized before power circuitry is activated or pro-

viding microprocessor reset timing.

These devices have user-adjustable battery threshold

voltages, providing a wide hysteresis range to prevent

chattering that can result due to battery recovery after

load removal. Single low-battery outputs are supplied

by the MAX6846/MAX6847 and dual low-battery out-

puts are supplied by the MAX6848/MAX6849. All bat-

tery monitors have open-drain low-battery outputs.

The MAX6846–MAX6849 monitor system voltages

options. Each device is offered with two minimum reset

timeout periods of 150ms or 1200ms. The MAX6846/

MAX6848 are offered with an open-drain RESET output

and the MAX6847/MAX6849 are offered with a push-

pull RESET output.

The MAX6846–MAX6849 are offered in a SOT23 pack-

age and are fully specified over a -40°C to +85°C temp-

erature range.

19-2947; Rev 0; 7/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

) from 1.8V to 3.3V with seven fixed reset threshold

Low-Power, Adjustable Battery Monitors with

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

________________________________________________________________ Maxim Integrated Products

General Description

Hysteresis and Integrated µP Reset

Applications

and

o User-Adjustable Thresholds for Monitoring

o Single and Dual Low-Battery Output Options

o Independent µP Reset with Manual Reset

o Factory-Set Reset Thresholds for Monitoring 1.8V

o Available with 150ms (min) or 1.2s (min) V

o 150ms (min) LBO Timeout Period

o Immune to Short-Battery Voltage Transients

o Low Current (2.5µA, typ at 3.6V)

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

o Small 8-Pin SOT23 Packages

Note: The first “_” is the V

in Table 1. The “_” after the D is a placeholder for the reset

timeout period suffix found in Table 2. All devices are available

in tape-and-reel only. There is a 2500 piece minimum order

increment for standard versions (see Standard Versions table).

Sample stock is typically held on standard versions only. Non-

standard versions require a minimum order increment of

10,000 pieces. Contact factory for availability.

MAX6846KA_D_-T

MAX6847KA_D_-T

MAX6848KA_D_-T

MAX6849KA_D_-T

TOP VIEW

LTHIN

Single-Cell Li+ or Multicell Alkaline/NiCd/NiMH

Applications

to 3.3V Systems

Reset Timeout Period Options

GND

LBO

PART

MAX6846

MAX6847

SOT23

Ordering Information

HTHIN

RESET

-40°C to +85°C

TEMP RANGE

reset threshold level, suffix found

Pin Configurations

LTHIN

LBOL

GND

MAX6848

MAX6849

SOT23

PIN-PACKAGE

8 SOT23-8

Features

LBOH

HTHIN

RESET

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