AN4192 datasheet(1/47 Pages) STMICROELECTRONICS

Part #	AN4192

Description	In the latest generation of CPUs for modern desktop and notebook platforms

PDF	47 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 47 page

November 2012

Doc ID 023820 Rev 1

1/47

AN4192

Application note

Power MOSFETs:

best choice guide for VRM applications

By Filadelfo Fusillo, Filippo Scrimizzi

Introduction

In the latest generation of CPUs for modern desktop and notebook platforms, the VRMs

(voltage regulator modules) must have some specific features in order to reach high

performance in terms of power management. This target can be reached by analyzing all

the design parameters and their optimization, with a particular focus on the MOSFET

electrical characteristics and configuration.

The power stage must deliver very low core voltage (typically 1.2 V - 1.3 V) to the CPU at

high current levels (up to 160 A), with ever-increasing switching frequencies (up to 500 - 700

kHz). In order to match these requirements, the basic topology used in the VRMs is the

“multiphase synchronous buck converter”, which typically steps down to 12 V input voltage,

providing the desired core voltage.

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