ISL8101 Datasheet, PDF (1/20 Pages) Intersil Corporation – Two-Phase Multiphase Buck PWM Controller with Integrated MOSFET Drivers

®
Data Sheet
July 28, 2008
ISL8101
FN9223.1
Two-Phase Multiphase Buck PWM
Controller with Integrated MOSFET Drivers
The ISL8101 two-phase PWM control IC provides a
precision voltage regulation system for advanced loads up to
60A to 80A. Multiphase power conversion is a marked
departure from single phase converter configurations
employed to satisfy the increasing current demands of
modern microprocessors and other electronic circuits. By
distributing the power and load current, implementation of
multiphase converters utilize smaller and lower cost
transistors with fewer input and output capacitors. These
reductions accrue from the higher effective conversion
frequency with higher frequency ripple current due to the
phase interleaving process of this topology.
Outstanding features of this controller IC include programmable
VID codes compatible with Intel VRM9, VRM10, as well as
AMD’s Hammer microprocessors, along with a system
regulation accuracy of ±1%. The ISL8101, though, does not
intrinsically allow for load-line regulation (no droop).
Important features of this controller IC include a set of
sophisticated overvoltage and overcurrent protection.
Overvoltage results in the converter turning the lower
MOSFETs ON to clamp the rising output voltage and protect
the microprocessor. Like other Intersil multiphase
controllers, the ISL8101 uses cost and space-saving
r_DS(ON) sensing for channel current balance and
overcurrent protection. Channel current balancing is
automatic and accurate with the integrated current-balance
control system. Overcurrent protection can be tailored to any
application with no need for additional parts. These features
provide intelligent protection for modern power systems.
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
(°C)
PACKAGE
PKG.
DWG. #
ISL8101CRZ* 81 01CRZ
(Note)
0 to +70 24 Ld 4x4 QFN L24.4x4B
(Pb-Free)
ISL8101IRZ*
(Note)
81 01IRZ
-40 to +85 24 Ld 4x4 QFN L24.4x4B
(Pb-Free)
ISL8101EVAL1 Evaluation Platform
*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.
Features
• Integrated Two-Phase Power Conversion
• 5V to 12V Input Voltage Conversion
• Precision Channel Current Sharing
- Loss-Less Current Sampling - Uses r_DS(ON)
• Precision Output Voltage Regulation
- ±1% System Accuracy Over-Temperature (Commercial)
• Microprocessor Voltage Identification Inputs
- Up to a 6-Bit DAC
- Selectable between Intel’s VRM9, VRM10, or AMD’s
Hammer DAC codes
• Fast Transient Recovery Time
• Overcurrent Protection
• Pre-Biased Output Start-Up Operation
• Sources and Sinks Output Current
- Bus Termination Applications
• Improved, Multi-tiered Overvoltage Protection
• QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package Footprint, Which Improves
PCB Efficiency and has aThinner Profile
• Pb-free (RoHS compliant)
Pinout
ISL8101
(24 LD QFN)
TOP VIEW
24 23 22 21 20 19
VID1 1
18 PHASE1
VID0 2
17 LGATE1
DACSEL/VID5 3
VRM10 4
25
GND
16 PVCC
15 LGATE2
COMP 5
14 PGND
FB 6
13 PHASE2
7 8 9 10 11 12
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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