Device Information
 
 
ISL6556A Printer Friendly Version
 
Optimized Multiphase PWM Controller with 6-Bit DAC for VR10.X Application
 
Datasheets,
Related Docs
& Simulations		DescriptionKey
Features		Parametric
Data		Related
Devices
 
 
Ordering Information
 iBuy direct from Intersil  iBuy direct - out of stock  Request samples
 Check distributor inventory Green/Pb(Lead free) Device  Available in RoHS/Pb-Free  
Part No. Design-In
Status		 Temp. Package MSL Price
US $		 PB Free
ISL6556ACBZ Active Comm 28 Ld SOIC 3 2.11 PB Free Disti-Buy  
ISL6556ACBZ-T Active Comm 28 Ld SOIC T+R 3 2.11 PB Free Disti-Buy  
ISL6556ACRZ Active Comm 32 Ld QFN 3 2.16 PB Free Buy Direct Disti-Buy  
ISL6556ACRZ-T Active Comm 32 Ld QFN T+R 3 2.16 PB Free Disti-Buy  
ISL6556ACB InActive Comm 28 Ld SOIC 1 N/A      
ISL6556ACB-T InActive Comm 28 Ld SOIC T+R 1 N/A      
ISL6556ACR InActive Comm 32 Ld QFN 1 N/A      
ISL6556ACR-T To Be
Discontinued		 Comm 32 Ld QFN T+R 1 2.16      
The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice.
MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020
SMD = Standard Microcircuit Drawing
 
  Description

The ISL6556A 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.

The ISL6556A utilizes rDS(ON) current sensing in each phase for adaptive voltage positioning (droop), channelcurrent balancing, and overcurrent protection. To ensure droop accuracy, an external NTC compensation circuit can be used to completely nullify the effect of temperature related variation in rDS(ON).

A unity gain, differential amplifier is provided for remote voltage sensing. Any potential difference between remote and local grounds can be eliminated using the remote-sense amplifier. The precision threshold-sensitive enable input is available to accurately coordinate the start up of the ISL6556A with Intersil MOSFET driver IC. Dynamic-VID™ technology allows seamless on-the-fly VID changes. The offset pin allows accurate voltage offset settings that are independent of VID setting. The ISL6556A uses 5V bias and has a built-in shunt regulator to allow 12V bias using only a small external limiting resistor.

 
  Key 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
    • 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)
Related Documentation
 
Datasheet(s)   Datasheet(s):
 
  Parametric Data
VIN (min) (V)3
VIN (max) (V)12
VOUT (min) (V).8375
VOUT (max) (V)1.6
IOUT (max) (A)≥120
VBIAS (V)5, 12
ApplicationsVR10
 
  Related DevicesParametric Table   Parametric Table
 
 ISL6316 Enhanced 4-Phase PWM Controller with 6-Bit VID Code Capable of Precision RDS(on) or DCR Differential Current Sensing for VR10 Application 
 ISL6556B Optimized Multiphase PWM Controller with 6-Bit DAC and Programmable Internal Temperature Compensation for VR10.X Application 
 ISL6561 Multiphase PWM Controller with Precision Rds, On or DCR Current Sensing 
 ISL6563 Two-Phase Multiphase Buck PWM Controller with Integrated MOSFET Drivers 
 ISL6565A Multiphase PWM Controller with Precision rDS(ON) or DCR Current Sensing for VR10.X Application 
 ISL6565B Multiphase PWM Controller with Precision rDS(ON) or DCR Current Sensing for VR10.X Application 
 ISL6566 Three-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications 
 ISL6566A Three-Phase Buck PWM Controller with Two Integrated MOSFET Drivers and One External Driver Signal 
 ISL6568 Two-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications 

 
About Us | Careers | Contact Us | Investors | Legal | Privacy | Site Map | Subscribe | Intranet

©2003-2009. Intersil Americas Inc. All rights reserved.