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FN9096.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002-2004. All Rights Reserved. Dynamic VID™ is a trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
ISL6556A
Optimized Multiphase PWM Controller
with 6-Bit DAC for VR10.X Application
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 r
DS(ON)
current sensing in each
phase for adaptive voltage positioning (droop), channel-
current 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 r
DS(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.
Features
• Precision Multi-Phase Core Voltage Regulation
- Differential Remote Voltage Sensing
- 0.5% System Accuracy Over Temperature and Life
- Adjustable Reference-Voltage Offset
• Precision r
DS(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)
Ordering Information
PART NUMBER* TEMP. (°C) PACKAGE PKG. DWG. #
ISL6556ACB 0 to 70 28 Ld SOIC M28.3
ISL6556ACBZ
(Note)
0 to 70 28 Ld SOIC
(Pb-free)
M28.3
ISL6556ACR 0 to 70 32 Ld 5x5B QFN L32.5x5B
ISL6556ACRZ
(Note)
0 to 70 32 Ld 5x5B QFN
(Pb-free)
L32.5x5B
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020C.
*Add “-T” suffix for tape and reel.
Data Sheet December 29, 2004
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