ISL62882 Datasheet, PDF (1/42 Pages) Intersil Corporation – Multiphase PWM Regulator for IMVP-6.5 Mobile CPUs and GPUs

Multiphase PWM Regulator for IMVP-6.5™ Mobile
CPUs and GPUs
ISL62882, ISL62882B
The ISL62882 is a multiphase PWM buck regulator for
miroprocessor or graphics processor core power supply.
The multiphase buck converter uses interleaved phases
to reduce the total output voltage ripple with each phase
carrying a portion of the total load current, providing
better system performance, superior thermal
management, lower component cost, reduced power
dissipation, and smaller implementation area. The
ISL62882 uses two integrated gate drivers to provide a
complete solution. The PWM modulator is based on
Intersil's Robust Ripple Regulator (R³) technology™.
Compared with traditional modulators, the R^3™
modulator commands variable switching frequency
during load transients, achieving faster transient
response. With the same modulator, the switching
frequency is reduced at light load, increasing the
regulator efficiency.
The ISL62882 can be configured as CPU or graphics
Vcore controller and is fully compliant with IMVP-6.5™
specifications. It responds to PSI# and DPRSLPVR signals
by adding or dropping Phase 2, adjusting overcurrent
protection threshold accordingly, and entering/exiting
diode emulation mode. It reports the regulator output
current through the IMON pin. It senses the current by
using either discrete resistor or inductor DCR whose
variation over temperature can be thermally
compensated by a single NTC thermistor. It uses
differential remote voltage sensing to accurately regulate
the processor die voltage. The unique split LGATE
function further increases light load efficiency. The
adaptive body diode conduction time reduction function
minimizes the body diode conduction loss in diode
emulation mode. User-selectable overshoot reduction
function offers an option to aggressively reduce the
output capacitors as well as the option to disable it for
users concerned about increased system thermal stress.
The ISL62882 offers the FB2 function to optimize
1-phase performance.
The ISL62882B has the same functions as the ISL62882,
but comes in a different package.
Features
• Programmable 1- or 2-Phase CPU Mode Operation or
1-Phase GPU Mode Operation
• Precision Multiphase Core Voltage Regulation
- 0.5% System Accuracy Over-Temperature
- Enhanced Load Line Accuracy
• Microprocessor Voltage Identification Input
- 7-Bit VID Input, 0V to 1.500V in 12.5mV Steps
- Supports VID Changes On-The-Fly
• Supports Multiple Current Sensing Methods
- Lossless Inductor DCR Current Sensing
- Precision Resistor Current Sensing
• Supports PSI# and DPRSLPVR modes
• Superior Noise Immunity and Transient Response
• Current Monitor and Thermal Monitor
• Differential Remote Voltage Sensing
• High Efficiency Across Entire Load Range
• Programmable 1- or 2-Phase Operation
• Two Integrated Gate Drivers
• Excellent Dynamic Current Balance Between Phases
• Split LGATE1 Drivers Increases Light Load Efficiency
• FB2 Function Optimizes 1-Phase Mode Performance
• Adaptive Body Diode Conduction Time Reduction
• User-selectable Overshoot Reduction Function
• Small Footprint 40 Ld 5x5 or 48 Ld 6x6 TQFN
Packages
• Pb-Free (RoHS Compliant)
Applications
• Notebook Core Voltage Regulator
• Notebook GPU Voltage Regulator
April 29, 2010
FN6890.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2009, 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.