Intersil ISL62882移动CPU多相PWM稳压方案
Multiphase PWM Regulator for IMVP-6.5 Mobile CPUs and GPUs
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 Intersils 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 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 ISL62882A is the same as ISL62882 with the only exception of not having the split LGATE1 function. The ISL62882B has the same functions as the ISL62882, but comes in a different package.
ISL62882主要特性:
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)
ISL62882应用:
Notebook Core Voltage Regulator
Notebook GPU Voltage Regulator
图1.采用DCR检测的ISL62882 GPU应用电路
图2.采用电阻检测的ISL62882 GPU应用电路
图3.1相GPU应用参考设计电路
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