LM2587 - SIMPLE SWITCHER® 5A Flyback Regulator

	LM2587 - SIMPLE SWITCHER® 5A Flyback Regulator

Datasheet	Packaging	Samples & Pricing	Eval. Boards	Reliability	Design Tools	Knowledge Base

Features

•	Requires few external components
•	Family of standard inductors and transformers
•	NPN output switches 5.0A, 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 LM2587 series of regulators are monolithic integrated circuits specifically designed for flyback, step-up (boost), and forward converter applications. More...

Applications

•	Flyback regulator
•	Multiple-output regulator
•	Simple boost regulator
•	Forward converter

Typical Application

click for larger image

Parametric Table expand

Parametric Table collapse

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

Switch Current 5 Amp

Input Min Voltage 4 Volt

Input Max Voltage 40 Volt

Feedback Voltage 3.3, 1.23, 12, 5 Volt

Frequency Max 100000 Hz

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

Switch Current 5 Amp

Input Min Voltage 4 Volt

Input Max Voltage 40 Volt

Feedback Voltage 3.3, 1.23, 12, 5 Volt

Frequency Max 100000 Hz

Efficiency (peak) 90, 75, 80 %

Sync Pin No

Adj Switch Frequency No

Frequency Min 100000 Hz

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

View Using Catalog

Typical Performance

*click for larger image

WEBENCH Live Simulation!

LM2587 WEBENCH® Custom Design/Analyze/Build It/Test It
4.00 <=	V in Lower V	<=	V in Upper V	<= 40.00
V out	1.23 <=		V	<= 300.00
I out			A	<= 5.00
Ambient Temperature			°C	<= 100
What are WEBENCH® tools?

Also Recommended

LM2588	LM2587 W/ Synchronizable Adjustable Frequency And Soft Start
LM3478	Switching Controller For Higher Current Capability

Additional Resources

Design Tools (see below)

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM2587 SIMPLE SWITCHER® 5A Flyback Regulator	819 Kbytes	6-Feb-04	View Online Download
LM2587 SIMPLE SWITCHER® 5A Flyback Regulator (Japanese)	965 Kbytes

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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

Full production

N/A

1+

$34.40

1

8 weeks

N/A

LM2587T-12

5

NOPB

1

NA

Full production

N/A

Samples

1K+

$4.17

rail
of
45

NSUZXYTTE#
LM2587T
-12 P+

8 weeks

1000

LM2587T-3.3

5

NOPB

1

NA

Full production

N/A

1K+

$4.17

rail
of
45

NSUZXYTTE#
LM2587T
-3.3 P+

6 weeks

100

LM2587T-5.0

5

NOPB

1

NA

Full production

N/A

Samples

1K+

$4.17

rail
of
45

NSUZXYTTE#
LM2587T
-5.0 P+

8 weeks

500

LM2587T-ADJ

5

STD

NOPB

1

1

NA

NA

Full production

N/A

Samples

1K+

$4.17

rail
of
45

NSUZXYTTE#
LM2587T
-ADJ P+

6 weeks

500

LM2587S-12

5

NOPB

3

245

Full production

N/A

Samples

1K+

$4.17

rail
of
45

NSUZXYTTE#
LM2587S
-12 P+

6 weeks

500

LM2587S-3.3

5

NOPB

3

245

Full production

N/A

1K+

$4.17

rail
of
45

NSUZXYTTE#
LM2587S
-3.3 P+

8 weeks

N/A

LM2587S-5.0

5

STD

NOPB

3

3

235

245

Full production

N/A

Samples

1K+

$4.17

rail
of
45

NSUZXYTTE#
LM2587S
-5.0 P+

8 weeks

500

LM2587S-ADJ

5

STD

NOPB

3

3

235

245

Full production

N/A

Samples

1K+

$4.17

rail
of
45

NSUZXYTTE#
LM2587S
-ADJ P+

6 weeks

500

LM2587SX-12

5

NOPB

3

245

Full production

N/A

1K+

$4.17

reel
of
500

NSUZXYTTE#
LM2587S
-12 P+

8 weeks

1000

LM2587SX-3.3

5

Full production

N/A

1K+

$4.17

reel
of
500

NSUZXYTTE#
LM2587S
-3.3 P+

16 weeks

N/A

LM2587SX-5.0

5

STD

NOPB

3

3

235

245

Full production

N/A

1K+

$4.17

reel
of
500

NSUZXYTTE#
LM2587S
-5.0 P+

8 weeks

1000

LM2587SX-ADJ

5

STD

NOPB

3

3

235

245

Full production

N/A

1K+

$4.17

reel
of
500

NSUZXYTTE#
LM2587S
-ADJ P+

6 weeks

2000

General Description

The LM2587 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 5.0A 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)
LM2587S-12	SLM	0	39546	0	0	2857500	2	810823427
LM2587S-3.3	SLM	0	39546	0	0	2857500	2	810823427
LM2587S-5.0	SLM	0	39546	0	0	2857500	2	810823427
LM2587S-ADJ	SLM	0	39546	0	0	2857500	2	810823427
LM2587SX-12	SLM	0	39546	0	0	2857500	2	810823427
LM2587SX-3.3	SLM	0	39546	0	0	2857500	2	810823427
LM2587SX-5.0	SLM	0	39546	0	0	2857500	2	810823427
LM2587SX-ADJ	SLM	0	39546	0	0	2857500	2	810823427
LM2587T-12	SLM	0	39546	0	0	2857500	2	810823427
LM2587T-3.3	SLM	0	39546	0	0	2857500	2	810823427
LM2587T-5.0	SLM	0	39546	0	0	2857500	2	810823427
LM2587T-ADJ	SLM	0	39546	0	0	2857500	2	810823427

Note: The Early Failure Rates were calculated as point estimates. 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	12 Kbytes	11-Jan-2008	View

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Application Notes

Title	Size in Kbytes	Date
AN-1095: Application Note 1095 Design of Isolated Converters Using Simple Switchers	398 Kbytes	26-Sep-02	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-1082: Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency	50 Kbytes	18-Sep-02	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	188 Kbytes	1-Oct-02	Download
AN-1061 (Japanese): Application Note 1061 Power Conversion in Line-Powered Equipment	215 Kbytes

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[Information as of 13-Oct-2008]