Automotive Current-Sense Amplifier with Reverse-Battery Protection

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.

Applications

* Battery Current Sense * ECU Current Monitor * Fuse Box Current Sense

* 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