Datasheet > LM2639MX

LM2639MX

更新时间： 2024-11-22 23:46:47

品牌	Logo	应用领域
其他 - ETC		开关光电二极管控制器
页数	文件大小	规格书
8页	155K
描述
Voltage-Mode SMPS Controller

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LM2639MX 数据手册

February 2000

LM2639

5-Bit Programmable, High Frequency Multi-phase PWM

Controller

The LM2639 also provides input under-voltage lock-out with

hysteresis and input over-current protection.

General Description

The LM2639 provides an attractive solution for power sup-

™

plies of high power microprocessors (such as Pentium II

Features

™

M II , K6 -2, K6 -3, etc.) exhibiting ultra fast load tran-

sients. Compared to a conventional single-phase supply, an

LM2639 based multi-phase supply distributes the thermal

and electrical loading among components in multiple phases

and greatly reduces the corresponding stress in each com-

ponent. The LM2639 can be programmed to control either a

3-phase converter or a 4-phase converter. Phase shift

among the phases is 120˚ in the case of three phase and 90˚

with four-phase. Because the power channels are out of

phase, there can be significant ripple cancellation for both

the input and output current, resulting in reduced input and

output capacitor size. Due to the nominal operating fre-

quency of 2 MHz per phase, the size of the output inductors

can be greatly reduced which results in a much faster load

transient response and a dramatically shrunk output capaci-

tor bank. Microprocessor power supplies with all surface

mount components can be easily built.

n Ultra fast load transient response

n Enables all surface-mount-design

n Selectable 2, 3, 4 phase operation

n Clock frequency from 40 kHz to 10 MHz

n Precision load current sharing

n 5-bit programmable from 3.5V to 1.3V

n VID code compatible to VRM 8.X specification

n Output voltage is 2.0V for VID code 11111

n Selectable internal or external clock

n Digital 16-step soft start

n Input under-voltage lock-out, over-current protection

Applications

n Servers and workstations

n High current, ultra-fast transient microprocessors

The internal high speed transconductance amplifier guaran-

tees good dynamic performance. The output drive voltages

can be adjusted through a resistor divider to control switch-

ing loss in the external FETs.

The internal master clock frequency of up to 8 MHz is set by

an external reference resistor. An external clock of 10 MHz

can also be used to drive the chip to achieve frequency con-

trol and multi-chip operation.

Pin Configuration

24-Pin Plastic SOIC

DS101143-1

Top View

See NS Package Number M24B

™

M II is a trademark of Cyrix Corporation a wholly owned subsidiary of National Semiconductor Corporation.

™

Pentium II is a trademark of Intel Corporation.

™

K6 is a trademark of Advanced Micro Devices, Inc.

DS101143

www.national.com

12 3 4 5 6 7 8

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LM2640	NSC	获取价格	Dual Adjustable Step-Down Switching Power Supply Controller
LM26400Y	NSC	获取价格	Dual 2A, 500kHz Wide Input Range Buck Regulator
LM26400Y	TI	获取价格	LM26400Y Dual 2-A, 500-kHz Wide Input Range Buck Regulator
LM26400Y_0708	NSC	获取价格	Dual 2A, 500kHz Wide Input Range Buck Regulator
LM26400Y_15	TI	获取价格	LM26400Y Dual 2-A, 500-kHz Wide Input Range Buck Regulator
LM26400YMH	NSC	获取价格	Dual 2A, 500kHz Wide Input Range Buck Regulator
LM26400YMH/NOPB	NSC	获取价格	IC 2 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO16, ETSSOP-16, Switching Regul
LM26400YMH/NOPB	TI	获取价格	LM26400Y Dual 2-A, 500-kHz Wide Input Range Buck Regulator
LM26400YMHX	NSC	获取价格	Dual 2A, 500kHz Wide Input Range Buck Regulator
LM26400YMHX/NOPB	NSC	获取价格	IC 2 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO16, ETSSOP-16, Switching Regul

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