DATASHEET
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ISL62882C
Multiphase PWM Regulator for IMVP-6.5™ Mobile CPUs and GPUs
FN7556
Rev 3.00
September 26, 2013
The ISL62882C is a multiphase PWM buck regulator for
microprocessor 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 ISL62882C 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 R3™ 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 ISL62882C 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 ISL62882C offers the FB2 function
to optimize 1-phase performance.
Applications
• Notebook Core Voltage Regulator
• Notebook GPU Voltage Regulator
Features
• Programmable 1- or 2-Phase CPU or 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
• 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 TQFN Packages
• Pb-Free (RoHS Compliant)
Related Literature
• See AN1461 for ISL62882/ISL62882C Evaluation
Board Application Note “ISL62882EVAL2Z User Guide”
• See TB495, "ISL62882C, ISL62883C Connection
Guidelines for 1-Phase Configuration"
• See TB496, "VR_ON Timing Guidelines for ISL6288x
Products"
Load Line Regulation
1.10
1.08
1.06
VIN = 8V
1.04
1.02
1.00
VIN = 12V
VIN = 19V
0.98
0.96
0.94
0.92
0 5 10 15 20 25 30 35 40 45 50 55 60 65
IOUT (A)
FN7556 Rev 3.00
September 26, 2013
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