Datasheet > LM27262MTDX/NOPB

LM27262MTDX/NOPB

更新时间： 2024-10-28 14:52:27

品牌	Logo	应用领域
德州仪器 - TI		开关光电二极管
页数	文件大小	规格书
22页	1105K
描述
SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO48

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LM27262MTDX/NOPB 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	TSSOP,	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.84	模拟集成电路 - 其他类型：	SWITCHING CONTROLLER
控制模式：	VOLTAGE-MODE	控制技术：	PULSE WIDTH MODULATION
最大输入电压：	5.5 V	最小输入电压：	4.65 V
标称输入电压：	5 V	JESD-30 代码：	R-PDSO-G48
JESD-609代码：	e3	长度：	12.5 mm
湿度敏感等级：	2	功能数量：	1
端子数量：	48	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	座面最大高度：	1.1 mm
表面贴装：	YES	切换器配置：	SINGLE
最大切换频率：	345 kHz	端子面层：	TIN
端子形式：	GULL WING	端子节距：	0.5 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	6.1 mm	Base Number Matches：	1

LM27262MTDX/NOPB 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LM27262MTDX/NOPB相关器件

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LM2727	TI	获取价格	LM2727/LM2737 N-Channel FET Synchronous Buck Regulator Controller

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