LM2679T50 National Semiconductor, LM2679T50 Datasheet

LM2679T50

Manufacturer Part Number

LM2679T50

Description

TO220

Manufacturer

National Semiconductor

Datasheet

1.LM2679SX-ADJ.pdf (26 pages)

Specifications of LM2679T50

Date_code

08+

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LM2679

SIMPLE SWITCHER

with Adjustable Current Limit

General Description

The LM2679 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 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 LM2679 are available from several

manufacturers to greatly simplify the design process.

Other features include the ability to reduce the input surge

current at power-ON by adding a softstart timing capacitor to

gradually turn on the regulator. The LM2679 series also has

built in thermal shutdown and resistor programmable current

limit of the power MOSFET switch to protect the device and

load circuitry under fault conditions. The output voltage is

guaranteed to a

controlled to within a

Typical Application

SIMPLE SWITCHER

is a registered trademark of National Semiconductor Corporation.

90%) is obtained through the use of a low

2% tolerance. The clock frequency is

11% tolerance.

DS100847

5A Step-Down Voltage Regulator

Features

n Efficiency up to 92%

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

n Resistor programmable peak current limit over a range

n 120 mΩ DMOS output switch

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

n Wide input voltage range: 8V to 40V

n 260 KHz fixed frequency internal oscillator

n Softstart capability

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)

of 3A to 7A.

37V ) versions

conditions

switching regulators

regulators

2%maximum output tolerance over full line and load

90%) step-down

10084703

www.national.com

April 2005

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