Diodes Incorporated introduced a dual-phase synchronous rectified buck controller, designed to provide a high-integrity supply for distributed high-power architectures. With an operating frequency adjustable between 50 Hz to 1 MHz per phase, the AP3595 is capable of delivering an output current of up to 60 A and suits the power needs of high-end GPU and memory cores.
Available in the standard U-QFN4040-24 package, this compact buck controller integrates 12 V + 12 V bootstrapped MOSFET drivers to ensure highest efficiency power conversion. To further help simplify circuit design and reduce the external part count and PCB size, the bootstrap diode is itself built into the device. In order to optimize system performance, the AP3595’s gate drive voltage is fully configurable, regulated via a reference input set using an external voltage divider.
By tuning the duty cycle of each channel in response to internal MOSFET onresistance sensing, the controller ensures phase currents are balanced at all times. A power-saving interface (PSI) enables it to automatically switch between dual and single mode to help reduce losses. With the VPSI pin at greater than 1.2 V, the controller enters dual phase mode; at less than 0.4 V, single phase mode is selected.
To ensure high-reliability operation at high currents, the AP3595 buck controller features a comprehensive range of built-in protection features that include overcurrent, input/output under-voltage, over-voltage and over-temperature protection. An adjustable soft-start feature adds an additional level of circuit security.
