MAX9937(2008) データシートの表示（PDF） - Maxim Integrated

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MAX9937
(Rev.:2008)

Automotive Current-Sense Amplifier with Reverse-Battery Protection

Maxim Integrated 

19-4233; Rev 0; 8/08

Automotive Current-Sense Amplifier

with Reverse-Battery Protection

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.

Features

♦ Reverse Battery and Load-Dump Protection

-20V to +40V

♦ +4V to +28V Input Common-Mode Range

♦ Flexible EMI Filtering

♦ Low VOS: ±1.2mV (max)

♦ Low VOS Drift: 1µV/°C (typ)

♦ 20µA Supply Current

♦ 350kHz, 3dB Small Signal Bandwidth

Applications

Automotive Battery Current Sense

Fuse Box Current Sense

ECU Current Monitor

Pin Configuration appears at end of data sheet.

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

MAX9937AXK+T -40°C to +125°C 5 SC70

+Denotes a lead-free/RoHS-compliant package.

T = Tape and reel.

TOP

MARK

+ATB

Typical Application Circuit

RS+

RSENSE

RS-

VBAT = 4V

TO 28V

RRSP

499Ω

RSP

GND

RRSN

499Ω

RSN

VCC

LOAD

5V

BIAS

BLOCK

MICROCONTROLLER

MAX9937

OUT

GAIN = VOUT = ROUT

ADC

VSENSE RRSP

ROUT

10kΩ

________________________________________________________________ Maxim Integrated Products 1

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.

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