LM2641

更新时间： 2024-11-23 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	450K
描述
Dual Adjustable Step-Down Switching Power Supply Controller

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中文翻译

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LM2641 数据手册

January 2000

LM2641

Dual Adjustable Step-Down Switching Power Supply

Controller

General Description

The LM2641 is a dual step-down power supply controller in-

tended 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 8V

n 0.5 typical load 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.

n 0.002 /V typical line regulation error

Features

n 300 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 ex-

cellent line and load regulation and a wide loop bandwidth

for fast response to dynamic loads.

An internal oscillator fixes the switching frequency at

300 kHz. Optionally, switching can be synchronized to an ex-

ternal 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)

DS100949-1

Top View

Order Number LM2641MTC-ADJ

See NS Package Number MTC28

DS100949

www.national.com

12 3 4 5 6 7...19

中文翻译

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与LM2641相关器件

型号	品牌	获取价格	描述	数据表
LM2641-ADJMDC	NSC	获取价格	IC DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or
LM2641-ADJMDC	TI	获取价格	DUAL SWITCHING CONTROLLER, 345kHz SWITCHING FREQ-MAX, UUC, DIE
LM2641-ADJMWC	NSC	获取价格	IC DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator
LM2641CS	NSC	获取价格	IC VREG 5 V-20 V ADJUSTABLE POSITIVE LDO REGULATOR, PSSO5, TO-263, 5 PIN, Adjustable Posit
LM2641CS	TI	获取价格	5 V-20V ADJUSTABLE POSITIVE LDO REGULATOR, PSSO5, TO-263, 5 PIN
LM2641CT	NSC	获取价格	暂无描述
LM2641CT	TI	获取价格	5 V-20V ADJUSTABLE POSITIVE LDO REGULATOR, PSFM5, PLASTIC, TO-220, 5 PIN
LM2641J/883	NSC	获取价格	IC VREG 5 V-20 V ADJUSTABLE POSITIVE LDO REGULATOR, CDIP16, CERAMIC, DIP-16, Adjustable Po
LM2641MTC-ADJ	NSC	获取价格	Dual Adjustable Step-Down Switching Power Supply Controller
LM2641MTC-ADJ	TI	获取价格	LM2641 Dual Adjustable Step-Down Switching Power Supply Controller

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