ISL62883 Datasheet, PDF (1/39 Pages) Intersil Corporation – Multiphase PWM Regulator for IMVP-6.5 Mobile CPUs and GPUs

Multiphase PWM Regulator for IMVP-6.5™ Mobile
CPUs
ISL62883, ISL62883B
The ISL62883 is a multiphase PWM buck regulator for
miroprocessor core power supply. The multiphase buck
converter uses interleaved phase 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 ISL62883 uses two integrated
gate drivers and an external gate driver to provide a
complete solution. The PWM modulator is based on
Intersil's Robust Ripple Regulator (R³) technology™.
Compared with traditional modulators, the R³â„¢
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 ISL62883 is fully compliant with IMVP-6.5™
specifications. It responds to PSI# and DPRSLPVR signals
by adding or dropping PWM3 and Phase 2 respectively,
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 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. In 2-Phase
configuration, the ISL62883 offers the FB2 function to
optimize 1-Phase performance.
The ISL62883B has the same functions as the ISL62883,
but comes in a different package.
Features
• Precision Multiphase Core Voltage Regulation
- 0.5% System Accuracy Over-Temperature
- Enhanced Load Line Accuracy
• Microprocessor Voltage Identification Input
- 7-Bit VID Input, 0.300V 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-, 2- or 3-Phase Operation
• Two Integrated Gate Drivers
• Excellent Dynamic Current Balance Between Phases
• FB2 Function in 2-Phase Configuration to Optimize
1-Phase Performance
• Adaptive Body Diode Conduction Time Reduction
• User-selectable Overshoot Reduction Function
• Small Footprint 40 Ld 5x5 or 48 Ld 6x6 TQFN
Package
• Pb-Free (RoHS Compliant)
Applications
• Notebook Computers
February 25, 2010
FN6891.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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