General Description

The MAX9918/MAX9919/MAX9920 are single-supply,

high-accuracy current-sense amplifiers with a high

input common-mode range that extends from -20V to

+75V. These amplifiers are well suited for current moni-

toring of inductive loads such as motors and solenoids,

where common-mode voltages can become negative

due to inductive kickback, reverse-battery conditions,

or transient events.

The MAX9918/MAX9920 feature adjustable gain set by

an external resistive-divider network. The MAX9919 fea-

tures fixed gains of 45V/V (MAX9919F) and 90V/V

(MAX9919N). The MAX9918/MAX9919/MAX9920 oper-

The MAX9920 attenuates the input signal by a factor of

4 at the input level-shifting stage allowing the device to

sense voltages up to 200mV (unidirectional operation)

or ±100mV (bidirectional operation).

The MAX9918/MAX9919/MAX9920 operate with a sin-

gle 5V supply voltage, are fully specified over the -40°C

to +125°C automotive temperature range, and are

available in an 8-pin SOIC package.

Applications

H-Bridge Motor Current Sensing

Solenoid Current Sensing

Current Monitoring of Inductive Loads

High- and Low-Side Precision Current Sensing

4x4 Transmission Control

Electronic Throttle Control

Super-Capacitor Charge/Discharge Monitoring in

Hybrid Cars

Precision High-Voltage Current Monitoring

Features

o -20V to +75V Input Common-Mode Voltage Range

o 400µV (max) Input Offset Voltage

o 0.6% (max) Gain Accuracy Error

o Uni- or Bidirectional Current Sensing

o Reference Input for Bidirectional OUT

o 120kHz, -3dB Bandwidth (MAX9919N)

o Single-Supply Operation (4.5V to 5.5V)

o 1mA Supply Current

o 0.5µA (typ) Shutdown Current

o Rail-to-Rail Output

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

-20V to +75V Input Range, Precision

Uni-/Bidirectional, Current-Sense Amplifiers

________________________________________________________________

Maxim Integrated Products

1

19-5015; Rev 4; 7/11

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION

KIT

AVAILABLE

M

φ2B

φ1B

ADC

REF

A

INPUT STAGE

LEVEL SHIFTER

ADJUSTABLE GAIN

RS+

RS-

FB

OUT

REFIN

R2

R1

GND

GND

SHDN

φ2B

φ1A

MAX9918

MAX9920

μC

Typical Operating Circuit

Ordering Information/

Selector Guide

PART

(mV)

GAIN

(V/V)

PIN-

PACKAGE

MAX9918ASA+

±50

Adjustable

8 SOIC-EP*

MAX9918ASA/V+

±50

Adjustable

8 SOIC-EP*

MAX9919FASA+

±50

45

8 SOIC-EP*

MAX9919NASA+

±50

90

8 SOIC-EP*

MAX9919NASA/V+

±50

90

8 SOIC-EP*

MAX9920ASA+

±200

Adjustable

8 SOIC-EP*

MAX9920ASA/V+

±200

Adjustable

8 SOIC-EP*

Note: All devices operate over the -40°C to +125°C temperature

range.

+

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

/V denotes an automotive qualified part.

*

EP = Exposed pad.