General Description

The MAX4173 low-cost, precision, high-side current-

sense amplifier is available in a tiny SOT23-6 package.

It features a voltage output that eliminates the need for

gain-setting resistors and it is ideal for today’s notebook

computers, cell phones, and other systems where cur-

rent monitoring is critical. High-side current monitoring

is especially useful in battery-powered systems, since it

does not interfere with the ground path of the battery

charger. The input common-mode range of 0 to +28V is

independent of the supply voltage and ensures that the

current-sense feedback remains viable even when con-

nected to a battery in deep discharge. The MAX4173’s

wide 1.7MHz bandwidth makes it suitable for use inside

battery charger control loops.

The combination of three gain versions and a user-

selectable external sense resistor sets the full-scale

current reading. This feature offers a high level of inte-

gration, resulting in a simple and compact current-

sense solution.

The MAX4173 operates from a single +3V to +28V sup-

ply, typically draws only 420µA of supply current over

the extended operating temperature range (-40°C to

+85°C), and is offered in the space-saving SOT23

package.

Applications

Notebook Computers

Portable/Battery-Powered Systems

Smart Battery Packs/Chargers

Cell Phones

Power-Management Systems

General System/Board-Level Current Monitoring

PA Bias Control

Precision Current Sources

Features

o Low-Cost, Compact Current-Sense Solution

o High Accuracy +2V to +28V Common-Mode

Range, Functional Down to 0V, Independent of

Supply Voltage

o Three Gain Versions Available

+20V/V (MAX4173T)

+50V/V (MAX4173F)

+100V/V (MAX4173H)

o ±0.5% Full-Scale Accuracy

o ±3mV Input Offset Voltage (MAX4173T)

o Wide 1.7MHz Bandwidth (MAX4173T)

o 420µA Supply Current

o Available in Space-Saving SOT23 Package

Low-Cost, SOT23, Voltage-Output,

High-Side Current-Sense Amplifier

________________________________________________________________

Maxim Integrated Products

1

MAX4173T/F/H

0 TO +28V

OUT

GND

RS+

+3V TO +28V

RS-

LOAD/

BATTERY

A/D

CONVERTER

0.1

µF

Typical Operating Circuit

19-1434; Rev 5; 4/11

PART

MAX4173TEUT+T

MAX4173TESA+

PIN-PACKAGE

6 SOT23

8 SO

Ordering Information

-40°C to +85°C

-40°C to +85°C

TEMP RANGE

SOT TOP MARK

AABN

—

MAX4173FEUT+T

-40°C to +85°C

6 SOT23

AABO

MAX4173FESA+

-40°C to +85°C

8 SO

—

MAX4173HEUT+T

-40°C to +85°C

6 SOT23

AABP

MAX4173HESA+

-40°C to +85°C

8 SO

—

20

20

GAIN (V/V)

50

50

100

100

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.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

T

= Tape and reel.