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General Description

The MAX4373/MAX4374/MAX4375 low-cost, micropow-

er, high-side current-sense supervisors contain a high-

side current-sense amplifier, bandgap reference, and

comparator with latching output. They feature a voltage

output that eliminates the need for gain-setting resistors,

making them 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 battery-powered systems since it

does not interfere with the ground path of the battery

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

independent of the supply voltage, which ensures that

the current-sense feedback remains viable even when

connected to a battery pack in deep discharge.

The comparator output of the MAX4373/MAX4374/

MAX4375 is latched to provide a turn-off flag that

doesn’t oscillate. In addition, the MAX4374/MAX4375

contain a second comparator for use in window-detec-

tion functions. The MAX4373/MAX4374/MAX4375 are

available in three different gain versions (T = +20V/V,

F = +50V/V, H = +100V/V) and use an external sense

resistor to set the sensitivity of the input voltage to the

load current. These features offer a high level of inte-

gration, resulting in a simple and compact current-

sense solution.

The MAX4373/MAX4374/MAX4375 operate from a sin-

gle +2.7V to +28V supply and consume 50µA. They are

specified for the extended operating temperature range

(-40°C to +85°C) and are available in 8-pin and 10-pin

µMAX packages.

________________________Applications

Notebook Computers

Portable/Battery-Powered Systems

Smart Battery Packs/Chargers

Cell Phones

Power-Management Systems

General-System/Board-Level Current Monitoring

Precision Current Sources

Features

o Current-Sense Amplifier plus Internal Comparator

and Bandgap Reference

o 50µA Supply Current

o Single +2.7V to +28V Operating Supply

o 0.66% Full-Scale Accuracy

o Internal Bandgap Reference

o Latching Comparator Output

o Three Gain Versions Available (+20V/V, +50V/V,

+100V/V)

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

Independent of Supply Voltage

Low-Cost, Micropower, High-Side Current-Sense

Amplifier + Comparator + Reference ICs

________________________________________________________________ Maxim Integrated Products

1

MAX4373

RS-

RS+

OUT

CIN

LOAD/

BATTERY

GND

R3

COUT

C1

0.1

µF

R2

R1

RESET

Typical Operating Circuit

19-1630; Rev 0; 3/00

Pin Configurations appear at end of data sheet.

8 SO

8 µMAX

PIN-

PACKAGE

TEMP. RANGE

-40°C to +85°C

-40°C to +85°C

MAX4373TESA

MAX4373TEUA

PART

+20

+20

GAIN

(V/V)

8 µMAX

-40°C to +85°C

MAX4373FEUA

+50

8 SO

-40°C to +85°C

MAX4373FESA

+50

8 µMAX

-40°C to +85°C

MAX4373HEUA

+100

8 SO

-40°C to +85°C

MAX4373HESA

+100

Ordering Information continues at end of data sheet.

Ordering Information