Multi-Phase PWM Controller with Precision rDS(ON)or DCR Differential Current Sensing for VR10.X Application

The ISL6561 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. Lower ripple results in fewer components, lower component cost, reduced power dissipation, and smaller implementation area. Microprocessor loads can generate load transients with extremely fast edge rates. The ISL6561 features a high bandwidth control loop and ripple frequencies of >4MHz to
provide optimal response to the transients.

Features
• Precision Multi-Phase Core Voltage Regulation
  - Differential Remote Voltage Sensing
  - ±0.5% System Accuracy Over Life, Load, Line and Temperature
  - Adjustable Reference-Voltage Offset
• Precision rDS(ON) or DCR Current Sensing
  - Integrated Programmable Temperature Compensation
  - Accurate Load-Line Programming
  - Accurate Channel-Current Balancing
  - Differential Current Sense
  - 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-Sensitive Enable Function for synchronizing with driver POR
• Overcurrent Protection
• Overvoltage Protection
  - No Additional External Components Needed
  - OVP Pin to drive opitional Crowbar Device
• 2, 3, or 4 Phase Operation
• Greater Than 1MHz Operation (> 4MHz Ripple)
• Pb-free Available(RoHS Compliant)
• 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