Optimized Multi-Phase PWM Controller with 6-Bit DAC and Programmable Internal Temperature Compensation for VR10.X Application

The ISL6556B controls microprocessor core voltage regulation by driving up to 4 synchronous-rectified buck channels in parallel. Multi-phase buck converter architecture uses interleaved timing to multiply channel ripple frequency and reduce input and output ripple currents.

Features

• Precision Multi-Phase Core Voltage Regulation

- Differential Remote Voltage Sensing

- ±0.5 System Accuracy Over Temperature and Life

- Adjustable Reference-Voltage Offset

• Precision rDS(ON) Current Sensing

- Integrated Programmable Temperature Compensation

- Accurate Load-Line Programming

- Accurate Channel-Current Balancing

- Low-Cost, Lossless Current Sensing

• Internal Shunt Regulator for 5V or 12V Biasing

• Microprocessor Voltage Identification Input

- Dynamic VID™ Technology

- 6-Bit VID Input

- 0.8375V to 1.600V in 12.5mV Steps

• Threshold Enable Function for Precision Sequencing

• Overcurrent Protection

• Overvoltage Protection

- No Additional External Components Needed

- OVP Pin to drive optional Crowbar Device

• 2, 3, or 4 Phase Operation up to 1.5MHz per Phase

• QFN Package Option

- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad

Flat No Leads - Product Outline

- QFN Near Chip Scale Package Footprint; Improves

PCB Efficiency, Thinner in Profile

• Pb-free Available (RoHS Compliant)