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.

The ISL6556B utilizes rDS(ON) current sensing in each phase for adaptive voltage positioning (droop), channel current balancing, and overcurrent protection. To ensure the accuracy of droop, a programmable internal temperature compensation function is implemented to nullify the effect of rDS(ON) temperature sensitivity.

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)