19-1781; Rev 7; 10/12

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

MAX4376/MAX4377/

MAX4378

Single/Dual/Quad, High-Side Current-Sense

Amplifiers with Internal Gain

GND

OUT

RS+

1

5

RS-

MAX4376

2

34

TOP VIEW

SOT23

+

General Description

The MAX4376/MAX4377/MAX4378 single, dual, and

quad precision high-side current-sense amplifiers are

available in space-saving packages. They feature

buffered voltage outputs that eliminate the need for

gain-setting resistors and are ideal for today’s notebook

computers, cell phones, and other systems where cur-

rent monitoring is critical. These precision devices are

offered in three fixed-gain versions of 20, 50, and 100:

GAIN

SUFFIX

20

T

50

F

100

H

For example, MAX4376TAUK is a single high-side

amplifier with a gain of 20.

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

battery pack in deep discharge.

The full-scale current reading can be set by choosing

the appropriate voltage gain and external-sense resis-

tor. This capability offers a high level of integration and

flexibility, resulting in a simple and compact current-

sense solution.

The MAX4376/MAX4377/MAX4378 operate over a sup-

ply voltage range of +3V to +28V, draw 1mA of supply

current per amplifier, and operate over the full automo-

tive temperature range of -40

°C to +125°C. These

devices have a wide bandwidth of 2MHz, making them

suitable for use inside battery-charger control loops.

The buffered outputs drive up to 2mA of output current

into a ground-referenced load.

The MAX4376 is available in a tiny 5-pin SOT23 pack-

age. The MAX4377/MAX4378 are available in space-

respectively.

Applications

Features

o Low-Cost, Single/Dual/Quad, High-Side Current-

Sense Amplifiers

o ±0.5% Typical Full-Scale Accuracy

o +3V to +28V Supply Operation

o Adjustable Current-Sense Capability with External

Sense Resistor

o Buffered Output Voltage with 2mA Drive

o 1mA (typ) Supply Current

o 2.0MHz Bandwidth (Gain = +20V/V)

o Automotive Temperature Range (-40°C to +125°C)

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

Range, Functional Down to 0V, Independent of

Supply Voltage

o Three Gain Versions Available

+20V/V (MAX437_T)

+50V/V (MAX437_F)

+100V/V (MAX437_H)

o Available in Space-Saving 5-Pin SOT23 (Single),

8-Pin µMAX (Dual), and 14-Pin TSSOP (Quad)

Pin Configurations continued at end of data sheet.

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

Ordering Information

Notebook Computers

Current-Limited Power

Supplies

Fuel Gauges in PC

General-System/Board-

Level Current Monitoring

Battery Chargers

Portable/Battery-Powered

Systems

Cell Phones

Smart Battery Packages

Automotive Current Detect

Power Management

Systems

PA Bias Control

Pin Configurations

PART

GAIN

(+V/V)

TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

MAX4376TAUK+T

20

-40

°C to +125°C

5 SOT23

ADOG

MAX4376TAUK/V+T

20

-40

°C to +125°C

5 SOT23

—

MAX4376FAUK+T

50

-40

°C to +125°C

5 SOT23

ADOH

MAX4376HAUK+T

100

-40

°C to +125°C

5 SOT23

ADOI

MAX4376HAUK/V+T

100

-40

°C to +125°C

5 SOT23

AFGO

MAX4376TASA+

20

-40

°C to +125°C8 SO

—

MAX4376FASA+

50

-40

°C to +125°C8 SO

—

MAX4376HASA+

100

-40

°C to +125°C8 SO

—

Ordering Information continued at end of data sheet.

+

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

/V denotes an automotive qualified part.

T = Tape and reel.