LM2640MTC-ADJ National Semiconductor, LM2640MTC-ADJ Datasheet

LM2640MTC-ADJ

Manufacturer Part Number

LM2640MTC-ADJ

Description

Dual Adjustable Step-Down Switching Power Supply Controller

Manufacturer

National Semiconductor

Datasheets

1.LM2640MTCX-ADJ.pdf (18 pages)

2.LM2640MTC-ADJ.pdf (20 pages)

3.LM2640MTC-ADJ.pdf (18 pages)

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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.

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

power

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.

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.

Connection Diagram and Ordering Information

MOSFETs

combined

with

DS100148

See NS Package Number MTC28

Order Number LM2640MTC-ADJ

28-Lead TSSOP (MTC)

optional

Top View

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

Features

n 200 kHz fixed-frequency switching

n Switching synchronization with an external signal up to

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

Applications

n Notebook and subnotebook computers

n Wireless data terminals

n Battery-powered instruments

400 kHz

10014801

www.national.com

May 2001

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