MAX16173

The MAX16173 is an ideal diode controller that provides system protection against input transients and reverse-current conditions. The wide operating voltage range of 3V to 50V, combined with 3µA of shutdown current, make the MAX16173 ideal for automotive applications. 

The MAX16173 features an integrated boost converter that is capable of driving the gate of the external n-channel power MOSFET 11V above the source during high load operation. Fast pull up and pull down current sources allow rectification of 50kHz to 250kHz AC components riding on the main supply input. A fast-acting comparator allows the MAX16173 to block reverse-current flow by shorting the gate to the source when the input is driven 10mV (typ) lower than the output. In light load applications, the MAX16173 regulates the voltage between the source and drain of the external n-channel MOSFET to 20mV(typ). For high load applications, the gate is driven high to enhance operation mode to minimize power dissipation and to increase system's power efficiency.

During normal operation, the boost converter regulates the gate voltage by monitoring the voltage across CD and DRN. When the voltage across V_CD-DRN drops below the 11V(typ) regulated voltage, the boost converter is enabled to maintain the regulation voltage. 

The MAX16173 features a diagnostic procedure to check the health of the power MOSFET. An open-drain active-high output (FETOK) deasserts low when the power MOSFET is either open or short. A power good output (PG) asserts high after the completion of power up to indicate the good power-up condition.

The MAX16173 is available in a 3mm x 3mm, 10-pin TDFN package and operates over the automotive temperature range of -40°C to +125°C.

Applications

• Automotive Power Systems
• Network Telecom Power Systems
• RAID Systems
• Servers