FAN53168

• Precision Multi-Phase DC-DC Core Voltage Regulation
±10mV Output Voltage Accuracy Over Temperature
• Differential Remote Voltage Sensing
• Selectable 2, 3, or 4 Phase Operation
• Up to 1MHz per Phase Operation (4MHz ripple Frequency)
• Lossless Inductor Current Sensing for Loadline Compensation
External Temperature Compensation
• Accurate Load-Line Programming (Meets Intel VRM/VRD10 CPU Specifications)
• Accurate Channel-Current Balancing for Thermal Optimization and Layout Compensation
• Convenient 12V Supply Biasing
• 6-bit Voltage Identification (VID) Input
.8375V to 1.600V in 12.5mV Steps
Dynamic VID Capability with Fault-Blanking for glitch-less Output voltage Changes
• Adjustable Over Current Protection with Programmable Latch-Off Delay
• Over-Voltage Protection - Internal OVP Crowbar Protection

• Computer DC/DC Converter VRM/VRD10.0
• Computer DC/DC Converter VRM/VRD9.X
• High Current, Low Voltage DC/DC Rail

The FAN53168 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 FAN53168 drives up to 4 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 FAN53168 features a high bandwidth control loop to provide optimal response to load transients. The FAN53168 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 MOSFET's. 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^oC to+85^oC and the operating voltage is a single +12V supply, simplifying design. The FAN53168 is available in a TSSOP- 28 package.