MAX9922AUB+ Maxim Integrated, MAX9922AUB+ Datasheet

MAX9922AUB+

Manufacturer Part Number

MAX9922AUB+

Description

Current Sense Amplifiers Current-Sense Amplifier

Manufacturer

Maxim Integrated

Series

MAX9922, MAX9923r

Datasheet

1.MAX9922AUBT.pdf (15 pages)

Specifications of MAX9922AUB+

Rohs

yes

Current page: 1 of 15
Download datasheet (347Kb)

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

rent-sense amplifiers feature ultra-low offset voltage

better than 0.5%. The combination of low V

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-

ation, connect REF to V

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-

mum full-scale V

The MAX9922/MAX9923 use a spread-spectrum

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 tech-

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

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

µMAX

+85°C extended temperature range.

Typical Operating Circuits appear at end of data sheet.

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

19-4429; Rev 1; 1/10

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.

) of 25µV (max) and laser-trimmed gain accuracy

Notebook/Desktop Power Management

Handheld Li+ Battery Current Monitoring

Precision Current Sources

package and are specified over the -40°C to

SENSE

________________________________________________________________ Maxim Integrated Products

voltage is critical.

General Description

/2.

Applications

and high-

Ultra-Precision, High-Side

Current-Sense Amplifiers

♦ Ultra-Precision V

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

♦ Bidirectional or Unidirectional I

♦ Multiple Gains Available

♦ 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

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

MAX9922EUB+

MAX9923TEUB+

MAX9923HEUB+ 10 µMAX

MAX9923FEUB+

Independent of V

TOP VIEW

PART

MAX9922: ±10µV (max)

MAX9923T: ±25µV (max)

MAX9923H: ±20µV (max)

MAX9923F: ±10µV (max)

Adjustable (MAX9922)

+25V/V (MAX9923T)

+100V/V (MAX9923H)

+250V/V (MAX9923F)

GND

N.C.

RSB

RS+

RS-

PIN-

PACKAGE

10 µMAX

Ordering Information

MAX9923T

MAX9923H

MAX9923F

Over Temperature

MAX9922

µMAX

Pin Configuration

- 40°C to + 85° C

RANGE

TEMP

SENSE

OUT

REF

SHDN

Features

GAIN (V/V)

Adjustable

100

250

Related parts for MAX9922AUB+

MAX9922AUB+ Summary of contents

Page 1

... Handheld Li+ Battery Current Monitoring Precision Current Sources Typical Operating Circuits appear at end of data sheet. µMAX is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 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. ...

Page 2

Ultra-Precision, High-Side Current-Sense Amplifiers ABSOLUTE MAXIMUM RATINGS RSB, RS+, RS- to GND...........................................-0.3V to +30V V to GND ..............................................................-0.3V to +6V DD OUT, REF, FB, SHDN to GND .................-0.3V to the lower of (V OUT Short Circuit GND ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +12V +3.3V, V RSB RS+ RS- DD =100V/V (R1 = 1kΩ 99kΩ), SHDN = V = 0V, MAX9922 is set for A V are ...

Page 4

Ultra-Precision, High-Side Current-Sense Amplifiers ELECTRICAL CHARACTERISTICS (continued +12V +3.3V, V RSB RS+ RS- DD =100V/V (R1 = 1kΩ 99kΩ), SHDN = V = 0V, MAX9922 is set for A V ...

Page 5

ELECTRICAL CHARACTERISTICS (continued +12V +3.3V, V RSB RS+ RS- DD =100V/V (R1 = 1kΩ 99kΩ), SHDN = V = 0V, MAX9922 is set for A V are ...

Page 6

Ultra-Precision, High-Side Current-Sense Amplifiers (V = 3.3V SHDN DD DD RSB RS+ MAX9922 UNIPOLAR GAIN ACCURACY HISTOGRAM -0.5 -0.4 -0.3 -0.2 -0.1 0 ...

Page 7

SHDN DD DD RSB RS+ SUPPLY CURRENT vs. TEMPERATURE 1.2 1.1 1.0 0 3.3V 0.8 DD 0.7 0.6 0.5 0.4 -40 -15 10 TEMPERATURE (°C) SHUTDOWN SUPPLY CURRENT ...

Page 8

Ultra-Precision, High-Side Current-Sense Amplifiers (V = 3.3V SHDN DD DD RSB RS+ INPUT NOISE DENSITY vs. FREQUENCY 250 200 150 100 50 32kHz SPIKE ENERGY 0 10 100 1,000 FREQUENCY (Hz) LARGE SIGNAL ...

Page 9

SHDN DD DD RSB RS+ SATURATION/OVERLOAD RECOVERY (INPUT LIMITED) (MAX9922) INPUT (100mV/div) OUTPUT (1V/div) TIME (200µs/div) PIN NAME 1 RSB Current-Sense Amplifier Input Stage Supply. Connect to either RS+ or ...

Page 10

Ultra-Precision, High-Side Current-Sense Amplifiers 1 RSB 2 RS+ 3 RS- 4 N.C. MAX9922 5 GND GAIN = Detailed Description The MAX9922/MAX9923 high-side, current-sense amplifiers implement a spread-spectrum autozeroing technique that minimizes the input offset ...

Page 11

OUT REF 2.5V -25mV 0 DISCHARGE CURRENT -2. OUT SENSE SENSE R1 Figure 1. Bidirectional Current-Sense Transfer Function The MAX9922/MAX9923 feature a logic shutdown input ...

Page 12

Ultra-Precision, High-Side Current-Sense Amplifiers Optional Noise Reduction Capacitor A noise reduction capacitance of ~1nF can be con- nected between OUT and FB, if needed. Noise reduc- tion is achieved by both limiting the amplifier bandwidth, reducing contribution of broadband white ...

Page 13

BATT 1.9V TO 28V Chip Information PROCESS: BiCMOS ______________________________________________________________________________________ Ultra-Precision, High-Side Current-Sense Amplifiers V SENSE RS+ RS- BATT RSB 1.9V TO 28V 3. OUT MAX9923T MAX9923H FB MAX9923F ON SHDN REF GND OFF *OPTIONAL NOISE REDUCTION V SENSE ...

Page 14

Ultra-Precision, High-Side Current-Sense Amplifiers For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but ...

Page 15

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2010 Maxim Integrated Products ...

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