LM2678-5.0 National Semiconductor, LM2678-5.0 Datasheet

LM2678-5.0

Manufacturer Part Number

LM2678-5.0

Description

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

Manufacturer

National Semiconductor

Datasheet

1.LM2678-5.0.pdf (23 pages)

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LM2678

SIMPLE SWITCHER

Voltage Regulator

General Description

The LM2678 series of regulators are monolithic integrated

circuits which provide all of the active functions for a

step-down (buck) switching regulator capable of driving up to

5A loads with excellent line and load regulation characteris-

tics. High efficiency (

low ON-resistance DMOS power switch. The series consists

of fixed output voltages of 3.3V, 5V and 12V and an adjust-

able output version.

The SIMPLE SWITCHER concept provides for a complete

design using a minimum number of external components. A

high fixed frequency oscillator (260KHz) allows the use of

physically smaller sized components. A family of standard in-

ductors for use with the LM2678 are available from several

manufacturers to greatly simplify the design process.

The LM2678 series also has built in thermal shutdown, cur-

rent limiting and an ON/OFF control input that can power

down the regulator to a low 50µA quiescent current standby

condition. The output voltage is guaranteed to a

ance. The clock frequency is controlled to within a

erance.

Typical Application

SIMPLE SWITCHER

is a registered trademark of National Semiconductor Corporation.

90%) is obtained through the use of a

DS100886

High Efficiency 5A Step-Down

2% toler-

11% tol-

Features

n Efficiency up to 92%

n Simple and easy to design with (using off-the-shelf

n 120 m

n 3.3V, 5V and 12V fixed output and adjustable (1.2V to

n 50µA standby current when switched OFF

n Wide input voltage range: 8V to 40V

n 260 KHz fixed frequency internal oscillator

n −40 to +125˚C operating junction temperature range

Applications

n Simple to design, high efficiency (

n Efficient system pre-regulator for linear voltage

n Battery chargers

external components)

37V ) versions

conditions

switching regulators

regulators

2%maximum output tolerance over full line and load

DMOS output switch

90%) step-down

DS100886-3

www.national.com

March 2000

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