Rainbow-electronics MAX9937 User Manual download pdf

General Description

The MAX9937 is a tiny automotive grade current-sense

amplifier designed for unidirectional high-side current-

sense applications. This device addresses major areas

of concern for automotive applications including load-

dump protection up to +40V, reverse-battery protec-

tion, and filtering for EMI and transient performance.

The MAX9937 also features a low input offset voltage of

±1.2mV (max) at +25°C with a low temperature drift of

just 1µV/°C (typ).

The MAX9937 is available in a 5-pin SC70 package and

is rated over the -40°C to +125°C temperature range.

Applications

Automotive Battery Current Sense

Fuse Box Current Sense

ECU Current Monitor

Features

♦ Reverse Battery and Load-Dump Protection

-20V to +40V

♦ +4V to +28V Input Common-Mode Range

♦ Flexible EMI Filtering

♦ Low V

: ±1.2mV (max)

♦ Low V

Drift: 1µV/°C (typ)

♦ 20µA Supply Current

♦ 350kHz, 3dB Small Signal Bandwidth

MAX9937

Automotive Current-Sense Amplifier

with Reverse-Battery Protection

________________________________________________________________

Maxim Integrated Products

19-4233; Rev 0; 8/08

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.

LOAD

MICROCONTROLLER

ADC

SENSE

GND

OUT

RS+

RS-

RSN

499Ω

RSP

499Ω

OUT

10kΩ

RSP

RSN

BIAS

BLOCK

BAT

= 4V

TO 28V

MAX9937

GAIN =

OUT

SENSE

OUT

RSP

Typical Application Circuit

Ordering Information

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX9937AXK+T -40°C to +125°C 5 SC70 +ATB

Denotes a lead-free/RoHS-compliant package.

T = Tape and reel.

Pin Configuration appears at end of data sheet.

1 2 3 4 5 6 ... 10 11

Summary of Contents

Page 1 - Ordering Information

General DescriptionThe MAX9937 is a tiny automotive grade current-senseamplifier designed for unidirectional high-side current-sense applications. Thi

Page 2 - ELECTRICAL CHARACTERISTICS

MAX9937Automotive Current-Sense Amplifierwith Reverse-Battery Protection10 ___________________________________________________________________________

Page 3

MAX9937Automotive Current-Sense Amplifierwith Reverse-Battery ProtectionMaxim cannot assume responsibility for use of any circuitry other than circuit

Page 4

MAX9937Automotive Current-Sense Amplifierwith Reverse-Battery Protection2 ____________________________________________________________________________

Page 5

MAX9937Automotive Current-Sense Amplifierwith Reverse-Battery Protection______________________________________________________________________________

Page 6

MAX9937Automotive Current-Sense Amplifierwith Reverse-Battery Protection4 ____________________________________________________________________________

Page 7

MAX9937Automotive Current-Sense Amplifierwith Reverse-Battery Protection______________________________________________________________________________

Page 8 - Pin Description

MAX9937Automotive Current-Sense Amplifierwith Reverse-Battery Protection6 ____________________________________________________________________________

Page 9 - Flexible EMI Filtering

MAX9937Automotive Current-Sense Amplifierwith Reverse-Battery Protection______________________________________________________________________________

Page 10 - Package Information

MAX9937Detailed DescriptionThe MAX9937 unidirectional high-side, current-senseamplifier features a 4V to 28V input common-mode volt-age range that is

Page 11 - SC70, 5L.EPS

In this case, RRS= RRSP= RRSN, ΔRRSdepends on thetolerance of the RRSresistors used, and ΔIB= input off-set current of the amplifier.The temperature d

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Rainbow-electronics MAX9937 User Manual

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Summary of Contents

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