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ISL6556A

更新时间： 2024-10-31 22:57:23
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英特矽尔 - INTERSIL 多相元件控制器
页数 文件大小 规格书
24页 697K
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Optimized Multi-Phase PWM Controller with 6-Bit DAC for VR10.X Application

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ISL6556A  
®
Data Sheet  
December 29, 2004  
FN9096.3  
Optimized Multi-Phase PWM Controller  
with 6-Bit DAC for VR10.X Application  
Features  
• Precision Multi-Phase Core Voltage Regulation  
- Differential Remote Voltage Sensing  
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.  
- ±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  
The ISL6556A utilizes r  
current sensing in each  
DS(ON)  
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  
• Internal Shunt Regulator for 5V or 12V Biasing  
• Microprocessor Voltage Identification Input  
- Dynamic VID™ Technology  
- 6-Bit VID Input  
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.  
- 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  
Ordering Information  
Flat No Leads - Product Outline  
- QFN Near Chip Scale Package Footprint; Improves  
PCB Efficiency, Thinner in Profile  
PART NUMBER* TEMP. (°C)  
PACKAGE  
PKG. DWG. #  
M28.3  
ISL6556ACB  
0 to 70  
0 to 70  
28 Ld SOIC  
• Pb-free Available (RoHS Compliant)  
ISL6556ACBZ  
(Note)  
28 Ld SOIC  
(Pb-free)  
M28.3  
ISL6556ACR  
0 to 70  
0 to 70  
32 Ld 5x5B QFN L32.5x5B  
ISL6556ACRZ  
(Note)  
32 Ld 5x5B QFN L32.5x5B  
(Pb-free)  
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.  
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.  
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