MAX9937
Current-Sense Amplifier with
Reverse-Battery Protection
General Description
The MAX9937 is a tiny current-sense amplifier designed
for unidirectional high-side current-sense applications.
This device addresses major areas of concern for various
applications including load-dump protection up to +40V,
reverse-battery protection, and filtering for EMI and tran-
sient 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
●● 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 VOS: ±1.2mV (max)
●● Low VOS Drift : 1µV/°C (typ)
●● 20µA Supply Current
●● 350kHz, 3dB Small-Signal Bandwidth
Ordering Information
PART
TEMP RANGE
PIN-
TOP
PACKAGE MARK
MAX9937AXK+T -40°C to +125°C 5 SC70
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
+ATB
Pin Configuration appears at end of data sheet.
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 =
VSENSE
ROUT
RRSP
ROUT
ADC
10kΩ
19-4233; Rev 1; 9/14