LM2640

更新时间： 2024-09-14 00:01:07

品牌	Logo	应用领域
美国国家半导体 - NSC		开关控制器
页数	文件大小	规格书
19页	487K
描述
Dual Adjustable Step-Down Switching Power Supply Controller

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数据手册

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LM2640 数据手册

May 2001

LM2640

Dual Adjustable Step-Down Switching Power Supply

Controller

General Description

The LM2640 is a dual step-down power supply controller

intended for application in notebook personal computers and

other battery-powered equipment.

Key Specifications

n 96% efficient

n 5.5 to 30V input range

n Dual outputs adjustable from 2.2 to 6V

n 0.5% typical load regulation error

n 0.002%/V typical line regulation error

Fixed-frequency synchronous drive of logic-level N-channel

power MOSFETs is combined with an optional

pulse-skipping mode to achieve ultra efficient power conver-

sion over a 1000:1 load current range. The pulse-skipping

mode can be disabled in favor of fixed-frequency operation

regardless of the load current level.

Features

n 200 kHz fixed-frequency switching

n Switching synchronization with an external signal up to

400 kHz

n Optional pulse-skipping mode

n Adjustable secondary feedback

n Input undervoltage lockout

n Output undervoltage shutdown protection

n Output overvoltage shutdown protection

n Programmable soft-start (each controller)

n 5V, 50 mA linear regulator output

n Precision 2.5V reference output

n 28-pin TSSOP

High DC gain and current-mode feedback control assure

excellent line and load regulation and a wide loop bandwidth

for fast response to dynamic loads.

An internal oscillator fixes the switching frequency at

200 kHz. Optionally, switching can be synchronized to an

external clock running as fast as 400 kHz.

An optional soft-start feature limits current surges from the

input power supply at start up and provides a simple means

of start-up sequencing.

Logic-level inputs allow the controllers to be turned ON and

OFF separately.

Applications

n Notebook and subnotebook computers

n Wireless data terminals

n Battery-powered instruments

Connection Diagram and Ordering Information

28-Lead TSSOP (MTC)

10014801

Top View

Order Number LM2640MTC-ADJ

See NS Package Number MTC28

DS100148

www.national.com

12 3 4 5 6 7...19

中文翻译

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