MAX4069-MAX4072 Maxim, MAX4069-MAX4072 Datasheet

MAX4069-MAX4072

Manufacturer Part Number

MAX4069-MAX4072

Description

Bidirectional / High-Side / Current-Sense Amplifiers with Reference

Manufacturer

Maxim

Datasheet

1.MAX4069-MAX4072.pdf (16 pages)

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The MAX4069–MAX4072 low-cost, bidirectional, high-

side, current-sense amplifiers are ideal for monitoring

battery charge and discharge currents in notebooks,

cell phones, and other portable equipment. They fea-

ture up to 24V input common-mode voltage range, low

100µA supply current (which drops to only 10µA in

shutdown), and a total output error of less than 1.5%.

The wide 1.35V to 24V input common-mode range is

independent of the supply voltage, ensuring that the

current-sense feedback remains accurate even when

connected to a battery pack in deep discharge.

To achieve maximum flexibility, an external current-sense

resistor is used along with a Gain Select pin to choose

either 50V/V or 100V/V. A single output pin continuously

monitors the transition from charge to discharge and

avoids the need for a separate polarity output. The

MAX4070 contains an internal 2.5V reference. The

charging current is represented by an output voltage

from 2.5V to V

2.5V to GND. The MAX4071 is similar, but with a refer-

ence voltage of 1.5V. The MAX4069 has an adjustable

reference voltage, set by two external resistors. The

MAX4072 has an input for an external reference.

The MAX4069/MAX4071/MAX4072 operate from a 2.7V to

24V single supply. The MAX4070 operates from a 3.6V to

24V single supply. All devices are specified over the

automotive operating temperature range, -40 C to

+125 C. The MAX4070/MAX4071/MAX4072 are available

in 8-pin µMAX and 8-pin thin QFN packages. The

MAX4069 is available in a 10-pin µMAX package.

19-2423; Rev 2; 1/03

Pin Configurations appear at end of data sheet.

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.

MAX4069

MAX4070

MAX4071

MAX4072

PART

Notebook Fuel Gauging

Smart-Battery Packs/Chargers

Motor Control

Power-Management Systems

Cell-Phone Battery-Current Monitoring

ADJUSTABLE

REFERENCE

EXTERNAL

, while discharge current is given from

________________________________________________________________ Maxim Integrated Products

2.5V

1.5V

Bidirectional, High-Side, Current-Sense

General Description

RANGE (V)

VOLTAGE

SUPPLY

2.7 to 24

3.6 to 24

2.7 to 24

Selector Guide

Applications

MODE RANGE

COMMON-

1.35 to 24

(V)

Amplifiers with Reference

o Bidirectional, Compact, Current-Sense Solution

o Total Output Error Less than 1.5%

o Selectable Gain of 50V/V or 100V/V

o Wide 1.35V to 24V Common-Mode Range

o 2.7V to 24V Single-Supply Operation

o Internal Precision Reference

o Low 100µA Supply Current

o 10µA Supply Current in Shutdown

o Available in Space-Saving Packages

*EP = Exposed paddle.

MAX4069AUB

MAX4070AUA

MAX4070ATA

MAX4071AUA

MAX4071ATA

MAX4072AUA

MAX4072ATA

Independent of Supply Voltage

Adjustable (MAX4069)

2.50V (MAX4070)

1.50V (MAX4071)

8-Pin Thin QFN (MAX4070/MAX4071/MAX4072)

8-Pin µMAX (MAX4070/MAX4071MAX4072)

10-Pin µMAX (MAX4069)

PART

BATT

= 1.35V TO 24V

= 3.6V TO 24V

Typical Operating Circuit

-40 C to +125 C 10 µMAX

-40 C to +125 C 8 µMAX

-40 C to +125 C 8 Thin QFN-EP*

-40 C to +125 C 8 µMAX

-40 C to +125 C 8 Thin QFN-EP*

-40 C to +125 C 8 µMAX

-40 C to +125 C 8 Thin QFN-EP*

TEMP RANGE

Ordering Information

GSEL

SHDN

RS-

MAX4070

SENSE

GND

PIN-PACKAGE

RS+

FROM BATTERY

REFOUT

CHARGER

OUT

Features

LOAD

TO ADC

2.5V

MARK

ABO

TOP

ABN

ABP

—

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