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FN4931.1
ISL6553
Microprocessor CORE Voltage Regulator
Multi-Phase Buck PWM Controller
The ISL6553 multi-phase PWM control IC together with its
companion gate drivers, the HIP6601, HIP6602 or HIP6603
provides a precision voltage regulation system for advanced
microprocessors. Multi-phase power conversion is a marked
departure from earlier single phase converter configurations
previously employed to satisfy the ever increasing current
demands of modern microprocessors. Multi-phase
converters, by distributing the power and load current results
in 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. For example, a two phase converter operating at
350kHz will have a ripple frequency of 700kHz. Moreover,
greater converter bandwidth of this design results in faster
response to load transients.
Outstanding features of this controller IC include
programmable VID codes from the microprocessor that
range from 1.05V to 1.825V with a system accuracy of 1%.
Pull up currents on these VID pins eliminates the need for
external pull up resistors. In addition “droop” compensation,
used to reduce the overshoot or undershoot of the CORE
voltage, is easily programmed with a single resistor.
Another feature of this controller IC is the PGOOD monitor
circuit which is held low until the CORE voltage increases,
during its Soft-Start sequence, to within 10% of the
programmed voltage. Over-voltage, 15% above
programmed CORE voltage, results in the converter shutting
down and turning the lower MOSFETs ON to clamp and
protect the microprocessor. Under voltage is also detected
and results in PGOOD low if the CORE voltage falls 10%
below the programmed level. Over-current protection
reduces the regulator RMS output current to 41% of the
programmed over-current trip value. These features provide
monitoring and protection for the microprocessor and power
system.
Features
• Multi-Phase Power Conversion
• Precision Channel Current Sharing
- Loss Less Current Sampling - Uses r
DS(ON)
• Precision CORE Voltage Regulation
- 1% System Accuracy Over Temperature
• Microprocessor Voltage Identification Input
- 5-Bit VID Input
- 1.05V to 1.825V in 25mV Steps
- Programmable “Droop” Voltage
• Fast Transient Recovery Time
• Over Current Protection
• High Ripple Frequency, (Channel Frequency) Times
Number Channels . . . . . . . . . . . . . . . . . .100kHz to 3MHz
• Pb-free available
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
Pinout
ISL6553 (SOIC)
TOP VIEW
Ordering Information
PART NUMBER TEMP. (
o
C) PACKAGE
PKG. DWG.
#
ISL6553CB 0 to 70 16 Ld SOIC M16.15
ISL6553CBZ (Note) 0 to 70 16 Ld SOIC
(Pb-free)
M16.15
ISL6553EVAL1 Evaluation Platform
*Add “-T” suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding
compounds/die attach materials and 100% matte tin plate termination finish, which
is 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-020B.
VID3
VID2
VID1
VID0
VID25mV
FS/DIS
VSEN
PGOOD
PWM1
PWM2
VCC
FB
ISEN1
COMP ISEN2
GND
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
Data Sheet August 2004
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. 2000, 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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