LM2585 - SIMPLE SWITCHER 3-Amp Flyback Regulator

LM2585 - SIMPLE SWITCHER 3-Amp Flyback Regulator

Datasheet	Packaging	Samples & Pricing	Reliability	Design Tools	Application Notes	Knowledge Base

Features

•	Requires few external components
•	Family of standard inductors and transformers
•	NPN output switches 3.0A, can stand off 65V
•	Wide input voltage range: 4V to 40V
•	Current-mode operation for improved transient response, line regulation, and current limit
•	100 kHz switching frequency
•	Internal soft-start function reduces in-rush current during start-up
•	Output transistor protected by current limit, under voltage lockout, and thermal shutdown
•	System Output Voltage Tolerance of ±4% max over line and load conditions

General Description

The LM2585 series of regulators are monolithic integrated circuits specifically designed for flyback, step-up (boost), and forward converter applications. More...

Typical Application

*click for larger image

Parameters Values

Output Range 1.23V min, 5V, 12V, 3.3V

Switch Current 3 Amp

Input Min Voltage 4 Volt

Input Max Voltage 40 Volt

Feedback Voltage 3.3, 1.23, 12, 5 Volt

Frequency Max 100 kHz

Efficiency (peak) 93, 80, 76 %

Sync Pin No

Adj Switch Frequency No

Frequency Min 100 kHz

On/Off Pin No

Error Flag No

SoftStart Yes

Special Features SIMPLE SWITCHER regulator

Topology Boost, Flyback

Step-Up Yes

Inverting No

Flyback Yes

RegType Switching Regulator

Adjustable Output Yes, No

Temperature Min -40 deg C

Temperature Max 125 deg C

Regulator Family SIMPLE SWITCHER

Typical Performance

*click for larger image

WEBENCH Live Simulation!

LM2585
4.00 <=	V in Lower V	<=	V in Upper V	<= 40.00
V out	1.23 <=		V	<= 300.00
I out			A	<= 3.00
Ambient Temperature			°C	<= 100
What are WEBENCH® tools?

Also Recommended

LM2586▲	LM2585 W/ Synchronizable, Adjustable Freq. And Soft Start
LM2587▲	5A Version Of LM2585
LM2623▲	Miniature 2.2A Switch (A Grade), Low Cost Versatile Converter
LM5000▲	Higher Frequency (300Khz To 1.25Mhz), 2A 80V Integrated Switch In Smaller Package
LM2700	Higher Frequency (600Khz, 1.25Mhz), Smaller Package, 3.6A Switch

Additional Resources

Online Seminars

SIMPLE SWITCHER® Topologies and their Morphology

Application Notes

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM2585 SIMPLE SWITCHER 3A Flyback Regulator	991 Kbytes	8-Mar-07	Download
LM2585 SIMPLE SWITCHER 3A Flyback Regulator (Japanese)	1422 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Qty

Qty

$US each

LM2587EVAL

SIMPLE SWITCHER? 5A Flyback Regulator Eval Board

Full production

N/A

Buy Now

1+

$34.40

1

8 weeks

N/A

LM2585T-12

5

NOPB

1

NA

Full production

N/A

Buy Now

1K+

$3.17

rail
of
45

NSUZXYTTE#
LM2585T
-12 P+

6 weeks

1000

LM2585T-3.3

5

NOPB

1

NA

Full production

N/A

Buy Now

1K+

$3.17

rail
of
45

NSUZXYTTE#
LM2585T
-3.3 P+

6 weeks

500

LM2585T-5.0

5

NOPB
STD

1
1

NA
NA

Full production

N/A

Samples

Buy Now

1K+

$3.17

rail
of
45

NSUZXYTTE#
LM2585T
-5.0 P+

6 weeks

500

LM2585T-ADJ

5

NOPB
STD

1
1

NA
NA

Full production

N/A

Samples

Buy Now

1K+

$3.17

rail
of
45

NSUZXYTTE#
LM2585T
-ADJ P+

6 weeks

500

LM2585S-12

5

NOPB
STD

3
3

245
235

Full production

N/A

Samples

Buy Now

1K+

$3.17

rail
of
45

NSUZXYTTE#
LM2585S
-12 P+

6 weeks

500

LM2585S-3.3

5

NOPB

3

245

Full production

N/A

Samples

Buy Now

1K+

$3.17

rail
of
45

NSUZXYTTE#
LM2585S
-3.3 P+

6 weeks

500

LM2585S-5.0

5

NOPB

3

245

Full production

N/A

Samples

Buy Now

1K+

$3.17

rail
of
45

NSUZXYTTE#
LM2585S
-5.0 P+

8 weeks

500

LM2585S-ADJ

5

NOPB
STD

3
3

245
235

Full production

N/A

Samples

Buy Now

1K+

$3.17

rail
of
45

NSUZXYTTE#
LM2585S
-ADJ P+

6 weeks

500

LM2585SX-12

5

NOPB
STD

3
3

245
235

Full production

N/A

Buy Now

1K+

$3.17

reel
of
500

NSUZXYTTE#
LM2585S
-12 P+

6 weeks

2000

LM2585SX-3.3

5

NOPB

3

245

Full production

N/A

Buy Now

1K+

$3.17

reel
of
500

NSUZXYTTE#
LM2585S
-3.3 P+

8 weeks

N/A

LM2585SX-5.0

5

NOPB
STD

3
3

245
235

Full production

N/A

Buy Now

1K+

$3.17

reel
of
500

NSUZXYTTE#
LM2585S
-5.0 P+

6 weeks

2000

LM2585SX-ADJ

5

NOPB
STD

3
3

245
235

Full production

N/A

Buy Now

1K+

$3.17

reel
of
500

NSUZXYTTE#
LM2585S
-ADJ P+

6 weeks

2000

General Description

The LM2585 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 adjustable.

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 regulators. Also listed are selector guides for diodes and capacitors and a family of standard inductors and flyback transformers 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 a 100 kHz fixed-frequency internal oscillator that permits the use of small magnetics. Other features include soft start mode to reduce in-rush current during start up, current mode control for improved rejection of input voltage and output load transients and cycle-by-cycle current limiting. An output voltage tolerance of ±4%, within specified input voltages and output load conditions, is guaranteed for the power supply system.

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2585S-12	SLM	0	44046	0	0	3532500	1	1002356520
LM2585S-3.3	SLM	0	44046	0	0	3532500	1	1002356520
LM2585S-5.0	SLM	0	44046	0	0	3532500	1	1002356520
LM2585S-ADJ	SLM	0	44046	0	0	3532500	1	1002356520
LM2585SX-12	SLM	0	44046	0	0	3532500	1	1002356520
LM2585SX-3.3	SLM	0	44046	0	0	3532500	1	1002356520
LM2585SX-5.0	SLM	0	44046	0	0	3532500	1	1002356520
LM2585SX-ADJ	SLM	0	44046	0	0	3532500	1	1002356520
LM2585T-12	SLM	0	44046	0	0	3532500	1	1002356520
LM2585T-3.3	SLM	0	44046	0	0	3532500	1	1002356520
LM2585T-5.0	SLM	0	44046	0	0	3532500	1	1002356520
LM2585T-ADJ	SLM	0	44046	0	0	3532500	1	1002356520

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

Design Tools

Title	Size in Kbytes	Date
SimpleSwitcher® DC-DC Converters Design Software			View

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Application Notes

Title	Size in Kbytes	Date
AN-1082: Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency	50 Kbytes	4-Oct-04	Download
AN-1082 (Japanese): Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency	85 Kbytes
AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment	162 Kbytes	1-Oct-02	Download
AN-1061 (Japanese): Application Note 1061 Power Conversion in Line-Powered Equipment	215 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

More Application Notes

Title	Size in Kbytes	Date
AN-1095: Application Note 1095 Design of Isolated Converters Using Simple Switchers	398 Kbytes	1-May-04	Download
AN-1095 (Japanese): Application Note 1095 Design of Isolated Converters Using Simple Switchers	403 Kbytes
AN-1095 (Chinese): Application Note 1095 Design of Isolated Converters Using Simple Switchers	436 Kbytes
AN-116: Application Note 116 Use the LM158/LM258/LM358 Dual, Single Supply Op Amp	101 Kbytes	1-Oct-02	Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 8-Nov-2009]