ISL6564 Datasheet, PDF (1/27 Pages) Intersil Corporation – Multi-Phase PWM Controller with Linear 6-bit DAC Capable of Precision rDS(ON) or DCR Differential Current Sensing

®
Data Sheet
December 27, 2004
ISL6564
FN9156.2
Multi-Phase PWM Controller with Linear
6-bit DAC Capable of Precision r_DS(ON) or
DCR Differential Current Sensing
The ISL6564 is a Multi-phase PWM controller which controls
microprocessor core voltage regulation by driving up to 4
synchronous-rectified buck channels. It features a high
bandwidth control loop to provide optimal response to the load
transients. With switching frequency up to 1.5MHz per phase,
the ISL6564 based voltage regulator requires minimum
components and PCB area in DC/DC converter application.
The ISL6564 senses current by utilizing patented techniques
to measure the voltage across the on resistance, r_DS(on), of
the lower MOSFETs or DCR of the output inductor during
their conduction intervals. Current sensing provides the
needed signals for precision droop, channel-current
balancing, and overcurrent protection.
A unity gain, differential amplifier is provided for remote
voltage sensing. Any potential difference between remote
and local grounds can be completely eliminated using the
remote-sense amplifier. Eliminating ground differences
improves regulation and protection accuracy. The threshold-
sensitive enable input is available to accurately coordinate
the start up of the ISL6564 with any other voltage rail.
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 ISL6564
uses a 5V bias and has a built-in shunt regulator to allow
12V bias using only a small external limiting resistor.
Ordering Information
PART NUMBER TEMP. (°C) PACKAGE PKG. DWG. #
ISL6564CR
0 to 70 40 Ld 6x6 QFN L40.6x6
ISL6564CR-T
0 to 70 40 Ld 6x6 QFN L40.6x6
ISL6564CRZ (Note)
0 to70
40 Ld 6x6 QFN L40.6x6
(Pb-free)
ISL6564CRZ-T
(Note)
0 to 70 40 Ld 6x6 QFN L40.6x6
(Pb-free)
ISL6564IR
-40 to 85 40 Ld 6x6 QFN L40.6x6
ISL6564IR-T
-40 to 85 40 Ld 6x6 QFN L40.6x6
ISL6564IRZ (Note)
-40 to 85 40 Ld 6x6 QFN L40.6x6
(Pb-free)
ISL6564IRZ-T (Note) -40 to 85 40 Ld 6x6 QFN L40.6x6
(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-020.
Features
• Precision Multi-Phase Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy
- Adjustable Reference-Voltage Offset
• Precision r_DS(ON) or DCR Current Sensing
- 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
- Self clocked Dynamic VID™ control technology
- 6-Bit VID Input
- 0.525V to 1.300V in 12.5mV Steps
• Threshold-Sensitive Enable Function for power
sequencing control
• Overcurrent Protection
• Overvoltage Protection
- No Additional External Components Needed
- OVP Pin to drive Crowbar Device
• 1, 2, 3, or 4 Phase Operation
• Up to 1.5MHz per phase Operation (>6MHz Ripple)
• QFN Package
- 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)
1
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. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.