A high frequency MOSFET driver designed to drive up and down power

Post Date: 2023-04-11 , Intersil

The PX3511A and PX3511B are high-frequency MOSFET drivers specifically designed to drive an up-and-down power N-channel MOSFET in a synchronous rectified buck converter topology. These drivers are combined with the ISL6595 digital multiphase Buck PWM controller and n-channel mosfet to form a complete core voltage regulator solution for advanced microprocessors.

The PX3511A drives the upper grid up to 12V, while the lower grid can be driven independently in the 5V to 12V range. The PX3511B drives the upper and lower doors in the 5V to 12V range. This drive voltage provides the flexibility necessary to optimize applications involving trade-offs between grid charge and conduction loss. Adaptive zero-through-protection is integrated to prevent the upper and lower MOSFeTs from conducting at the same time and minimize dead zone time.

These products add overvoltage protection to operate before the VCC exceeds its on-off threshold, at which the PHASE node connects to the gate of the low-side MOSFET (LGATE). The output voltage of the converter is then limited by the threshold of the lower side MOSFEts, which provides some protection for the microprocessor if the upper mosFEts short out during initial startup.

These drivers also feature a three-state PWM input that works in conjunction with Intersil's polyphase PWM controller to prevent negative transients of the output voltage when the output is turned off. This feature eliminates Schottky diodes, which are used in some systems to protect loads from reverse output voltage events.

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