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General Description

The MAX4372 low-cost, precision, high-side current-

sense amplifier is available in a tiny, space-saving

SOT23-5 package. Offered in three gain versions (T =

+20V/V, F = +50V/V, and H = +100V/V), this device

operates from a single +2.7V to +28V supply and con-

sumes only 30µA. It features a voltage output that elimi-

nates the need for gain-setting resistors and is ideal for

today’s notebook computers, cell phones, and other

systems where battery/DC current monitoring is critical.

High-side current monitoring is especially useful in bat-

tery-powered systems since it does not interfere with

the ground path of the battery charger. The input com-

mon-mode range of 0 to +28V is independent of the

supply voltage and ensures that the current-sense

feedback remains viable even when connected to a 2-

cell battery pack in deep discharge.

The user can set the full-scale current reading by

choosing the device (T, F, or H) with the desired volt-

age gain and selecting the appropriate external sense

resistor. This capability offers a high level of integration

and flexibility, resulting in a simple and compact cur-

rent-sense solution. For higher bandwidth applications,

refer to the MAX4173T/F/H data sheet.

Applications

Power-Management Systems

General-System/Board-Level Current Monitoring

Notebook Computers

Portable/Battery-Powered Systems

Smart-Battery Packs/Chargers

Cell Phones

Precision-Current Sources

Features

o Low-Cost, Compact Current-Sense Solution

o 30µA Supply Current

o +2.7V to +28V Operating Supply

o 0.18% Full-Scale Accuracy

o Low 1.5

Ω Output Impedance

o Three Gain Versions Available

+20V/V (MAX4372T)

+50V/V (MAX4372F)

+100V/V (MAX4372H)

o Wide 0 to +28V Common-Mode Range,

Independent of Supply Voltage

o Available in Space-Saving SOT23-5 Package

Low-Cost, SOT23, Micropower, High-Side

Current-Sense Amplifier with Voltage Output

________________________________________________________________

Maxim Integrated Products

1

RS+

15

RS-

MAX4372T/F/H

SOT23-5

TOP VIEW

2

34

RS-

N.C.

OUT

1

2

8

7

RS+

N.C.

N.C.

GND

SO

3

4

6

5

MAX4372T/F/H

OUT

GND

19-1548; Rev 0; 10/99

PART

MAX4372TEUK-T

MAX4372TESA

MAX4372FEUK-T

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

5 SOT23-5

8 SO

5 SOT23-5

Pin Configurations

Ordering Information

TOP

MARK

ADIU

—

ADIV

MAX4372FESA

MAX4372HEUK-T

MAX4372HESA

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C 8 SO

5 SOT23-5

8 SO

—

ADIW

—

RS-

OUT

A/D

CONVERTER

GND

RS+

0 TO 28V

+2.7V TO +28V

0.1

µF

MAX4372T/F/H

LOAD/

BATTERY

Typical Operating Circuit

Note: Gain values are as follows: +20V/V for the T version,

+50V/V for the F version, and +100V/V for the H version.