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Date: 28-06-14

Dual-phase sync buck controller for GPU/CPUs

Diodes Inc introduced a dual-phase synchronous rectified buck controller for powering GPU and CPU cores. PWM video-identification dynamic-output voltage control featured AP3598A has PWM controller, a pair of MOSFET drivers with internal bootstrap diodes and channel-current balance. AP3598A delivers high output current of 60A and harnesses external compensation to minimize output voltage ripple and optimize transient response.

Accurate phase current balance is maintained through lossless RDS(ON) current sensing, while inductor current sampling ensures a dependable current limit. AP3598A offers a power-save mode, which enables it to switch automatically between dual- and single-phase operation when subject to light loading.

For safe high-current operation, the controller provides a full complement of protection functions including over-current, over-temperature, and under- and over-voltage protection. Other features include adjustable soft-start, adjustable operating frequency selection, and a power-good indicator and enable control.

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