Implementing zero ground current diode operation by applying a floating ground architecture

TI announced the release of a smart diode controller with zero quiescent current that is more efficient than Schottky diodes and P-channel MOSFETs.

This new product, the LM74610-Q1, is suitable for reverse polarity protection in high-current industrial power tools and automotive applications due to its low power consumption and minimal heat generation within a compact solution size.

The LM74610-Q1 implements zero-ground current diode operation by applying a proprietary floating-ground architecture. When paired with TI’s CSD17313Q2Q1 NexFET™ N-channel MOSFET and connected in series with the power supply, it operates as a diode rectifier to discharge the MOSFET gate when reverse polarity occurs.

In addition, redundancy can be provided by combining two alternate power supplies in an ORing configuration using the LM74610-Q1.


Other features include zero quiescent current to eliminate battery power consumption and extend battery life. The use of an external N-channel MOSFET allows for the solution to be expanded to various current levels, and a 45V reverse voltage capacity protects against automotive transients. With 4kV ESD protection and AEC-Q100 certification for automotive applications, TI offers the LM74670-Q1 smart diode controller for automotive alternators and industrial power AC (alternating current) rectification. Because the LM74670-Q1 provides a higher gate drive current (70mA) than the LM74610-Q1, it can process AC signals up to 300Hz.

You can download ' System Level Reference Design Providing Automotive Protection Functions Required for 30W ADAS Systems, ' a reference design for multi-camera, surround-view ADAS systems. The LM74610-Q1 is available in an 8-pin 3mm x 5mm x 1.1mm VSSOP package. The price is $1.25 per unit based on a quantity of 1,000.