MAX4373/MAX4374/MAX4375

Low-Cost, Micropower, High-Side

Current-Sense Amplifier +

Comparator + Reference ICs

EVALUATION KIT AVAILABLE

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

Benefits and Features

• Integrated Current-Sensing Solution Simplifies High-

Side Current Monitoring

•

Current-Sense Amplifier plus Internal Comparator

and Bandgap Reference with Improved Accuracy

•

1mV (max) Input Offset Voltage

•

2% (max) Full-Scale Accuracy

•

Internal Bandgap Reference (±1.6% Accuracy)

• High Accuracy +2V to +28V Common-Mode Range,

Functional Down to 0V, Independent of Supply

Voltage Ensures Current Monitoring Even In Deep

Discharge of Battery Pack

• Low Power Consumption Extends Battery Life

•

50µA Supply Current

•

Single +2.7V to +28V Operating Supply

• Latching Comparator Output Eliminates Oscillation

• Three Gain Versions (+20V/V, +50V/V,

+100V/V) Support Different Size Battery Packs

MAX4373

RS-

RS+

OUT

CIN

LOAD/

BATTERY

VCC = 2.7V TO 28V

VIN = 0 TO 28V

GND

VCC

RSENSE

+ VSENSE -

ILOAD

VPULL-UP

(UP TO 5V)

R3

COUT

C1

0.1

µF

R2

R1

RESET

Pin Configurations appear at end of data sheet.

+

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

Ordering Information continued at end of data sheet.

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

GAIN

(V/V)

MAX4373TEUA+

-40

°C to +85°C

8 µMAX

+20

MAX4373TESA+

-40

°C to +85°C

8 SO

+20

MAX4373FEUA+

-40

°C to +85°C

8 µMAX

+50

MAX4373FESA+

-40

°C to +85°C

8 SO

+50

MAX4373HEUA+

-40

°C to +85°C

8 µMAX

+100

MAX4373HESA+

-40

°C to +85°C

8 SO

+100

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Typical Operating Circuit

19-1630; Rev 5; 5/15