Smart Diode Controller with Zero Quiescent Current
Texas Instruments (TI) today introduced the industry's first smart diode controller with zero quiescent current that provides better efficiency versus Schottky diodes and p-channel MOSFETs. The LM74610-Q1 provides lower power consumption and heat in a compact solution size, making it well-suited for reverse polarity protection in high-current industrial power tool and automotive applications.
The LM74610-Q1 features a unique floating ground architecture that models a diode behavior with zero ground current. Paired with TI's CSD17313Q2Q1 NexFETâ„¢ n-channel MOSFET, the duo emulates a diode rectifier when connected in series with a power source, discharging the MOSFET gate in the event of reverse polarity. The LM74610-Q1 can also be used to combine two alternate power sources in an ORing configuration to provide redundancy. Watch a video to learn how to protect your design from reverse voltage conditions.
LM74610-Q1 key features and benefits include: Zero quiescent current eliminates battery drainage and extends battery life. External n-channel MOSFET enables a scalable solution for a variety of current levels. 45V reverse voltage capability protects against automotive transients. AEC-Q100 qualified with 4 kV ESD protection for automotive applications.
For automotive alternator and industrial power ac rectification, TI offers the LM74670-Q1 smart diode controller, which has higher gate drive current (70uA) than the LM74610-Q1, allowing it to handle AC signals up to 300 Hz. Available in volume now from TI and its authorized distributors, the LM74610-Q1 is packaged in an 8-pin, 3-mm by 5-mm by 1.1-mm VSSOP package and priced at US$1.25 in 1,000-unit quantities.
