Datasheet > LM27262

LM27262

更新时间： 2024-11-24 23:16:47

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器电脑控制器 PC 个人电脑
页数	文件大小	规格书
22页	1101K
描述
Intel CPU Core Voltage Regulator Controller for VRD10 Compatible PCs

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LM27262 数据手册

October 2004

LM27262

Intel CPU Core Voltage Regulator Controller for VRD10

Compatible PCs

n User programmable, low loss, load line slope

n User programmable Standard VID offset

n User programmable VCORE slew rate

n 5V power rail Under Voltage Lock Out (UVLO)

General Description

The LM27262 is a versatile synchronous buck voltage regu-

lator controller designed according to the Intel VRD10 Speci-

fication. It’s a fixed-frequency voltage-mode control PWM

n Over Voltage Protection (OVP), Under Voltage

Protection (UVP), and Over Current Protection (OCP) to

defend against potentially catastrophic events

n User programmable fault latch that can be used to

disable the regulator in the event a power system fault

n Very fast transient response

n VID-transition masked PWRGOOD output

n True-differential current sensing for each phase ensures

accurate load current sharing

with average current modulation of the reference voltage to

achieve the desired output impedance. This approach im-

parts a pseudo current mode behavior to the control loop.

The part provides the control for a voltage regulator consist-

ing of either 2-, 3- or 4-phases to provide power to a desktop

CPU. Pulse-by-pulse phase current balancing ensures ac-

curate current sharing. CPU core currents of over 90A can

be supported without requiring significant over design of the

power path. The LM27262 contains a precision 6-bit digital-

to-analog converter (DAC) that uses a VID-code provided by

the CPU to program the desired CPU core voltage. The

regulator output voltage can be dynamically adjusted by

changing the VID-code “on the fly”.

n User programmable cycle-by-cycle current limit

Key Specifications

n Fast transient response to minimize output capacitor

requirements

The part is intended to provide all the specified functions laid

out in the VRD-10 specification, making it as simple as

possible for the user to realize a fully compliant CPU core

n Shorter design cycles through the use of external gate

drivers for reduced power dissipation, ease of PCB

layout and reduced noise sensitivity

n Fully integrated solution. All VRD-10 control functions

provided by a single device

™

supply for Intel’s Pentium 4 and Prescott processors.

The LM27262 is available in a 48-lead TSSOP package and

in a 48-lead LLP package.

n Accurate current balancing eliminates need to over

design the power path

n Fixed frequency PWM minimizes EMI issues

n Low input capacitor requirements due to multi-phase

interleaving

n Fault latching allows use of smaller power path

components and minimizes the chance of damage to

the load in the event of a fault

n Only need to buy as many drivers as the design needs

while keeping only one controller in inventory

Features

n Compatible with “VRD10 Voltage Regulation

Specification” for Intel Pentium 4 and Prescott

Processors

™

n Supports Intel SpeedStep technology

(Geyserville-III ), which enables real-time dynamic

switching of the CPU core voltage and the CPU clock

frequency

n Uses external gate drivers (LM2724) for maximum

layout flexibility and noise immunity

™

n Fixed frequency PWM architecture

Applications

n Pin selectable internal or external voltage reference

n 0.5% core voltage set-point accuracy when using

external voltage reference

n 0.9% accurate internal bandgap reference

n 2-, 3- or 4-phase operation

n Out-of-phase switching reduces input ripple current,

thereby minimizing input capacitor requirements

n VID-code programmable output voltage range of

0.8375V through 1.6000V

n Server and desktop computer CPU core power supplies

requiring a 2, 3- or 4-phase voltage regulator delivering

up to 100A

n Transportable notebook computers using desktop CPUs

n Low cost transportable notebook computers using 2- or

3-phase designs

™

Pentium is a trademark of Intel Corporation.

DS200834

www.national.com

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与LM27262相关器件

型号	品牌	获取价格	描述	数据表
LM27262LQ	NSC	获取价格	Intel CPU Core Voltage Regulator Controller for VRD10 Compatible PCs
LM27262LQX	NSC	获取价格	Intel CPU Core Voltage Regulator Controller for VRD10 Compatible PCs
LM27262MTD	NSC	获取价格	Intel CPU Core Voltage Regulator Controller for VRD10 Compatible PCs
LM27262MTD/NOPB	TI	获取价格	SWITCHING CONTROLLER, 345kHz SWITCHING FREQ-MAX, PDSO48, TSSOP-48
LM27262MTDX	NSC	获取价格	Intel CPU Core Voltage Regulator Controller for VRD10 Compatible PCs
LM27262MTDX/NOPB	TI	获取价格	SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO48
LM2726M	TI	获取价格	LM2725/LM2726 High Speed Synchronous MOSFET Drivers
LM2726M	NSC	获取价格	High Speed Synchronous MOSFET Drivers
LM2726M/NOPB	TI	获取价格	High Speed Synchronous MOSFET Driver 8-SOIC
LM2726MDC	NSC	获取价格	IC,DUAL MOSFET DRIVER,CMOS,DIE

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