MAX9937：Automotive Current-Sense Amplifier with Reverse-Battery Protection

Current-Sense Amplifier with Reverse-Battery and Load-Dump Protection from -20V to +40V

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 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.

Key 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

MAX9937: Typical Operating Circuit

Applications/Uses

Battery Current Sense
ECU Current Monitor
Fuse Box Current Sense

DataSheet

title	Download file
MAX9937 Data Sheet	MAX9937.pdf

Parametrics

Part Number	Output Format	CMVR (V)	CMVR (V)	V_CC (V)	V_CC (V)	I_CC (µA)	Bi-Dir. Curr. Sense	V_OS @25°C (µV)	Gain	Gain Accuracy @25°C (%)	BW (kHz)	Comp- arators	Oper. Temp. (°C)	Package/Pins	Budgetary Price
Part Number	Output Format	min	max	min	max	typ	Bi-Dir. Curr. Sense	max	Gain	max	@ -3dB	Comp- arators	Oper. Temp. (°C)	Package/Pins	See Notes
MAX9937	Voltage	4	28	2.7	5.5	20	No	1200	Adj.	1.5	350	0	-40 to +125	SC-70/5	$1.06 @1k