MAX4072AUA 查看數據表（PDF） - Maxim Integrated

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MAX4072AUA

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

Maxim Integrated 

MAX4069–MAX4072

Bidirectional, High-Side, Current-Sense

Amplifiers with Reference

General Description

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 feature 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

VCC, while discharge current is given from 2.5V to GND.

The MAX4071 is similar, but with a reference 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.

Applications

●● Notebook Fuel Gauging

●● Smart-Battery Packs/Chargers

●● Motor Control

●● Power-Management Systems

●● Cell-Phone Battery-Current Monitoring

μMAX is a registered trademark of Maxim Integrated Products,

Inc.

Pin Configurations and Selector Guide appear at end of

data sheet.

Features

●● Bidirectional, Compact, Current-Sense Solution

●● Total Output Error Less than 1.5%

●● Selectable Gain of 50V/V or 100V/V

●● Wide 1.35V to 24V Common-Mode Range

Independent of Supply Voltage

●● 2.7V to 24V Single-Supply Operation

●● Internal Precision Reference

• Adjustable (MAX4069)

• 2.50V (MAX4070)

• 1.50V (MAX4071)

●● Low 100μA Supply Current

●● 10μA Supply Current in Shutdown

●● Available in Space-Saving Packages

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

• 8-Pin μMAX (MAX4070/MAX4071/MAX4072)

• 10-Pin μMAX (MAX4069)

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX4069AUB+ -40°C to +125°C 10 µMAX

MAX4070AUA+ -40°C to +125°C 8 µMAX

MAX4070ATA+ -40°C to +125°C 8 Thin QFN-EP*

MAX4071AUA+ -40°C to +125°C 8 µMAX

MAX4071ATA+ -40°C to +125°C 8 Thin QFN-EP*

MAX4072AUA+ -40°C to +125°C 8 µMAX

MAX4072ATA+ -40°C to +125°C 8 Thin QFN-EP*

*EP = Exposed pad.

TOP

MARK

—

—

ADH

—

ADI

—

ADJ

Typical Operating Circuit

VBATT = 1.35V TO 24V

FROM BATTERY

CHARGER

RSENSE

VCC = 3.6V TO 24V

RS-

RS+

VCC

MAX4070

GSEL

OUT

LOAD

TO ADC

SHDN

REFOUT

2.5V

GND

19-2423; Rev 4; 11/16

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