General Description

The MAX9922/MAX9923 ultra-precision, high-side cur-

rent-sense amplifiers feature ultra-low offset voltage

gain accuracy allows precise current measurements

even at very small sense voltages.

The MAX9922/MAX9923 are capable of both unidirec-

tional and bidirectional operation. For unidirectional

operation, connect REF to GND. For bidirectional oper-

The MAX9922 has adjustable gain set with two external

resistors. The MAX9923T/MAX9923H/MAX9923F use an

internal laser-trimmed resistor for fixed gain of 25V/V,

100V/V, and 250V/V, respectively. The devices operate

from a +2.85V to +5.5V single supply, independent

of the input common-mode voltage, and draw only 700µA

operating supply current and less than 1µA in shutdown.

The +1.9V to +28V current-sense input common-mode

voltage range makes the MAX9922/MAX9923 ideal for

current monitoring in applications where high accuracy,

large common-mode measurement range, and mini-

The MAX9922/MAX9923 use a patented spread-spec-

trum autozeroing technique that constantly measures

and cancels the input offset voltage, eliminating drift

over time and temperature, and the effect of 1/f noise.

This, in conjunction with the indirect current-feedback

technique, achieves less than 25µV (max) offset voltage.

The MAX9922/MAX9923 are available in a small 10-pin

+85°C extended temperature range.

Applications

Notebook/Desktop Power Management

Handheld Li+ Battery Current Monitoring

Precision Current Sources

Features

MAX9922: ±10µV (max)

MAX9923T: ±25µV (max)

MAX9923H: ±20µV (max)

MAX9923F: ±10µV (max)

♦ ±0.5% (max) Full-Scale Gain Accuracy

♦ Multiple Gains Available

Adjustable (MAX9922)

+25V/V (MAX9923T)

+100V/V (MAX9923H)

+250V/V (MAX9923F)

♦ 1.9V to 28V Input Common-Mode Voltage,

♦ Supply Voltage: +2.85V to +5.5V

♦ 700µA Supply Current, 1µA Shutdown Current

♦ Extended Temperature Range (-40°C to +85°C)

♦ Available in Space-Saving 10-Pin µMAX

Ultra-Precision, High-Side

Current-Sense Amplifiers

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-4429; Rev 0; 3/09

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.

+

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

EVALUATION

KIT

AVAILABLE

PART

PIN-

PACKAGE

TEMP

RANGE

GAIN (V/V)

MAX9922EUB+

10 µMAX

-40°C to +85°C

Adjustable

MAX9923TEUB+

10 µMAX

-40°C to +85°C

25

MAX9923HEUB+

10 µMAX

-40°C to +85°C

100

MAX9923FEUB+

10 µMAX

-40°C to +85°C

250

Pin Configuration

1

2

3

4

5

10

9

8

7

6

OUT

FB

REF

N.C.

RS-

RS+

RSB

MAX9922

MAX9923T

MAX9923H

MAX9923F

µMAX

TOP VIEW

GND

SHDN

+

Typical Operating Circuits appear at end of data sheet.

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