LM2585

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SNVS120F – APRIL 2000 – REVISED APRIL 2013

Check for Samples: LM2585

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FEATURES

DESCRIPTION

The LM2585 series of regulators are monolithic

234

•

Requires Few External Components

integrated circuits specifically designed for flyback,

•

Family of Standard Inductors and

step-up (boost), and forward converter applications.

Transformers

The device is available in 4 different output voltage

•

NPN Output Switches 3.0A, Can Stand Off 65V

versions: 3.3V, 5.0V, 12V, and adjustable.

•

Wide Input Voltage Range: 4V to 40V

Requiring

a

minimum

number

of

external

components, these regulators are cost effective, and

•

Current-mode Operation for Improved

simple to use. Included in the datasheet are typical

Transient Response, Line Regulation, and

circuits of boost and flyback regulators. Also listed

Current Limit

are selector guides for diodes and capacitors and a

•

100 kHz Switching Frequency

family of standard inductors and flyback transformers

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Internal Soft-start Function Reduces In-rush

designed to work with these switching regulators.

Current During Start-up

The power switch is a 3.0A NPN device that can

•

Output Transistor Protected by Current Limit,

stand-off 65V. Protecting the power switch are current

Under Voltage Lockout, and Thermal

and thermal limiting circuits, and an undervoltage

Shutdown

lockout circuit. This IC contains a 100 kHz fixed-

frequency internal oscillator that permits the use of

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System Output Voltage Tolerance of ±4% Max

small magnetics. Other features include soft start

Over Line and Load Conditions

mode to reduce in-rush current during start up,

current mode control for improved rejection of input

TYPICAL APPLICATIONS

voltage and output load transients and cycle-by-cycle

•

Flyback Regulator

current limiting. An output voltage tolerance of ±4%,

within specified input voltages and output load

•

Multiple-output Regulator

conditions, is specified for the power supply system.

•

Simple Boost Regulator

•

Forward Converter

Connection Diagrams

Figure 3. Bent, Staggered Leads

5-Lead TO-220

Side View

Figure 1. Bent, Staggered Leads

See NDH005D Package

5-Lead TO-220

Top View

See NDH005D Package

Figure 4. 5-Lead DDPAK/TO-263

Side View

See KTT Package

Figure 2. 5-Lead DDPAK/TO-263

Top View

See KTT Package

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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Switchers Made Simple is a trademark of Texas Instruments.

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SIMPLE SWITCHER is a registered trademark of Texas Instruments.

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All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2000–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.