LM2676T-ADJ National Semiconductor, LM2676T-ADJ Datasheet

LM2676T-ADJ

Manufacturer Part Number

LM2676T-ADJ

Description

DC/DC Converter IC

Manufacturer

National Semiconductor

Datasheets

1.LM2676T-ADJ.pdf (25 pages)

2.LM2676T-ADJ.pdf (25 pages)

3.LM2676T-ADJ.pdf (23 pages)

Specifications of LM2676T-ADJ

Input Voltage

40V

Output Current

Output Voltage

37V

No. Of Pins

Termination Type

Through Hole

Mounting Type

Through Hole

Voltage Regulator Type

Switching

Output Current Max

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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LM2676

SIMPLE SWITCHER

Voltage Regulator

General Description

The LM2676 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

3A 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 LM2676 are available from several

manufacturers to greatly simplify the design process.

The LM2676 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

DS100914

High Efficiency 3A Step-Down

2% toler-

11% tol-

Features

n Efficiency up to 94%

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

n 150 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

DS100914-3

90%) step-down

www.national.com

April 2000

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