LM2586T-3.3 National Semiconductor, LM2586T-3.3 Datasheet

LM2586T-3.3

Manufacturer Part Number

LM2586T-3.3

Description

Power Supply IC

Manufacturer

National Semiconductor

Datasheets

1.LM2586SX-5.0.pdf (30 pages)

2.LM2586T-3.3.pdf (30 pages)

3.LM2586T-3.3.pdf (28 pages)

Specifications of LM2586T-3.3

Output Current

Output Voltage

3.3VDC

No. Of Pins

Peak Reflow Compatible (260 C)

Termination Type

Through Hole

Leaded Process Compatible

Mounting Type

Through Hole

Package / Case

7-TO-220

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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LM2586

SIMPLE SWITCHER

Shutdown

General Description

The LM2586 series of regulators are monolithic integrated

circuits specifically designed for flyback, step-up (boost), and

forward converter applications. The device is available in 4

different output voltage versions: 3.3V, 5.0V, 12V, and ad-

justable.

Requiring a minimum number of external components, these

regulators are cost effective, and simple to use. Included in

the datasheet are typical circuits of boost and flyback regu-

lators. Also listed are selector guides for diodes and capaci-

tors and a family of standard inductors and flyback trans-

formers designed to work with these switching regulators.

The power switch is a 3.0A NPN device that can stand-off

65V. Protecting the power switch are current and thermal

limiting circuits, and an undervoltage lockout circuit. This IC

contains an adjustable frequency oscillator that can be pro-

grammed up to 200 kHz. The oscillator can also be synchro-

nized with other devices, so that multiple devices can oper-

ate at the same switching frequency.

Other features include soft start mode to reduce in-rush

current during start up, and current mode control for im-

proved rejection of input voltage and output load transients

and cycle-by-cycle current limiting. The device also has a

shutdown pin, so that it can be turned off externally. An

output voltage tolerance of

ages and output load conditions, is guaranteed for the power

supply system.

Connection Diagrams

SIMPLE SWITCHER

Order Number LM2586T3.3, LM2586T-5.0,

See NS Package Number TA07B

LM2586T-12 or LM2586T-ADJ

and Switchers Made Simple

Bent, Staggered Leads

7-Lead TO-220 (T)

Top View

4%, within specified input volt-

are registered trademarks of National Semiconductor Corporation.

DS012516

3A Flyback Regulator with

01251617

Features

n Requires few external components

n Family of standard inductors and transformers

n NPN output switches 3.0A, can stand off 65V

n Wide input voltage range: 4V to 40V

n Adjustable switching frequency: 100 kHz to 200 kHz

n External shutdown capability

n Draws less than 60 µA when shut down

n Frequency synchronization

n Current-mode operation for improved transient

n Internal soft-start function reduces in-rush current during

n Output transistor protected by current limit, under

n System output voltage tolerance of

Typical Applications

n Flyback regulator

n Forward converter

n Multiple-output regulator

n Simple boost regulator

response, line regulation, and current limit

start-up

voltage lockout, and thermal shutdown

and load conditions

Bent, Staggered Leads

7-Lead TO-220 (T)

Side View

4% max over line

www.national.com

July 2005

01251618

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