FAN5019

The FAN5019 is a multi-phase DC-DC controller for implementing high-current, low-voltage, CPU core power regulation circuits. It is part of a chipset that includes external MOSFET drivers and power MOSFETS. The FAN5019 drives up to four synchronous-rectified buck channels in parallel. The multi-phase buck converter architecture uses interleaved switching to multiply ripple frequency by the number of phases and reduce input and output ripple currents. Lower ripple results in fewer components, lower component cost, reduced power dissipation, and smaller board area.

The FAN5019 features a high bandwidth control loop to provide optimal response to load transients. The FAN5019 senses current using lossless techniques: Phase current is measured through each of the output inductors. This current information is summed, averaged and used to set the loadline of the output via programmable "droop". The droop is temperature compensated to achieve precise loadline characteristics over the entire operating range. Additionally, individual phase current is measured using the R_DS(ON) of the low-side MOSFETs. This information is used to dynamically balance/steer per-phase current. The phase currents are also summed and averaged for over-current detection.

Dynamic-VID technology allows on-the-fly VID changes with controlled, glitch-less output. Additionally, short-circuit protection, adjustable current limiting, over-voltage protection and power-good circuitry combine to ensure reliable and safe operation. The operating temperature range is 0°C to+85°C and the operating voltage is a single +12V supply, which simplifies the design. The FAN5019 is available in a TSSOP-28 package.