LM2679T-3.3 National Semiconductor, LM2679T-3.3 Datasheet

LM2679T-3.3

Manufacturer Part Number

LM2679T-3.3

Description

Power Supply IC

Manufacturer

National Semiconductor

Datasheets

1.LM2679T-ADJ.pdf (26 pages)

2.LM2679T-ADJ.pdf (24 pages)

3.LM2679T-ADJ.pdf (24 pages)

Specifications of LM2679T-3.3

No. Of Outputs

No. Of Pins

Output Current

Peak Reflow Compatible (260 C)

Output Voltage

3.3VDC

Termination Type

Through Hole

Leaded Process Compatible

Mounting Type

Through Hole

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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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 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 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

trolled to within a

Typical Application

SIMPLE SWITCHER

is a registered trademark of National Semiconductor Corporation.

2% tolerance. The clock frequency is con-

11% tolerance.

90%) is obtained through the use of a

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 m

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

DMOS output switch

90%) step-down

DS100847-3

www.national.com

March 2000

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