Intersil ISL62882移動(dòng)CPU多相PWM穩(wěn)壓方案

作者：時(shí)間：2010-03-29 來(lái)源：網(wǎng)絡(luò)

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ISL62882是用于IMVP-6.5移動(dòng)CPU和GPU的多相 PWM穩(wěn)壓器,具有可編程的1相或2相CPU模式或1相GPU模式運(yùn)作,精密的多相核電壓調(diào)整,系統(tǒng)對(duì)溫度的精度為0.5%,具有增強(qiáng)的負(fù)載線(xiàn)精度,7位VID輸入,1-1.500V,增量12.5mV,主要應(yīng)用在筆記本電腦的處理核電壓穩(wěn)壓和GPU電壓穩(wěn)壓.本文介紹了ISL62882的主要特性, 采用DCR和電阻檢測(cè)的GPU應(yīng)用電路, 1相GPU應(yīng)用參考設(shè)計(jì)電路和相應(yīng)的材料清單, 2相GPU應(yīng)用參考設(shè)計(jì)電路和相應(yīng)的材料清單,以及ISL62882EVAL2Z評(píng)估板的電路圖和材料清單.

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應(yīng)用:

Notebook Core Voltage Regulator

Notebook GPU Voltage Regulator