LM2676SX-5.0 National Semiconductor, LM2676SX-5.0 Datasheet

LM2676SX-5.0

Manufacturer Part Number

LM2676SX-5.0

Description

IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR/MOS,SIP,7PIN,PLASTIC

Manufacturer

National Semiconductor

Datasheet

1.LM2676T-ADJ.pdf (25 pages)

Specifications of LM2676SX-5.0

Rohs 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 characteristics.

High efficiency (

ON-resistance DMOS power switch. The series consists of

fixed output voltages of 3.3V, 5V and 12V and an adjustable

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

inductors 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,

current 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

tolerance.

Typical Application

SIMPLE SWITCHER

is a registered trademark of National Semiconductor Corporation.

90%) is obtained through the use of a low

DS100914

High Efficiency 3A Step-Down

2% toler-

11%

Features

n Efficiency up to 94%

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

n 150 mΩ DMOS output switch

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

10091403

90%) step-down

www.national.com

April 2005

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