ISL6306 Datasheet, PDF (1/33 Pages) Intersil Corporation – 4-Phase PWM Controller with 8-Bit DAC Code Capable of Precision rDS ON or DCR Differential Current Sensing

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Data Sheet
May 5, 2008
ISL6306
FN9226.1
4-Phase PWM Controller with 8-Bit DAC
Code Capable of Precision r_DS(ON) or DCR
Differential Current Sensing
The ISL6306 controls microprocessor core voltage regulation
by driving up to 4 synchronous-rectified buck channels in
parallel. Multiphase 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 ISL6306 features a high
bandwidth control loop and ripple frequencies up to >4MHz to
provide optimal response to the transients.
Today’s microprocessors require a tightly regulated output
voltage position versus load current (droop). The ISL6306
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 the lower
MOSFET conduction intervals. Current sensing provides the
needed signals for precision droop, channel-current
balancing, and overcurrent protection. A programmable
internal temperature compensation function is implemented to
effectively compensate for the temperature coefficient of the
current sense element.
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 ISL6306 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.
Ordering Information
PART NUMBER PART
TEMP.
(Note)
MARKING (°C)
PACKAGE PKG.
(Pb-Free) DWG. #
ISL6306CRZ* ISL6306 CRZ 0 to +70 40 Ld 6x6 QFN L40.6x6
ISL6306CRZ-TK ISL6306 CRZ 0 to +70 40 Ld 6x6 QFN L40.6x6
Features
• Precision Multiphase Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Life, Load, Line and
Temperature
- Adjustable Precision Reference-Voltage Offset
• Precision r_DS(ON) or DCR Current Sensing
- Accurate Load-Line Programming
- Accurate Channel-Current Balancing
- Differential Current Sense
• Microprocessor Voltage Identification Input
- Dynamic VID™ Technology
- 8-Bit VID Input with Selectable VR11 Code and
Extended VR10 Code at 6.25mV per Bit
- 0.5V to 1.6V Operation Range
• Thermal Monitoring
• Integrated Programmable Temperature Compensation
• Threshold-Sensitive Enable Function for Power
Sequencing and VTT Enable
• Overcurrent Protection
• Overvoltage Protection
• 2-, 3- or 4-Phase Operation
• Adjustable Switching Frequency Up to 1MHz Per Phase
• 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 (RoHS Compliant)
ISL6306IRZ* ISL6306 IRZ -40 to +85 40 Ld 6x6 QFN L40.6x6
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach materials
and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which
is 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.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2006, 2007. All Rights Reserved. Dynamic VID™ is a trademark of Intersil Americas Inc.
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