Features • 80V internal switch • Operating input voltage range of 3.1V to 40V • Pin selectable operating frequency    300kHz/700kHz (-3)    600kHz/1.3MHz (-6) • Adjustable output voltage • External compensation • Input undervoltage lockout • Softstart • Current limit • Over temperature protection • External shutdown • Small 16-Lead TSSOP or 16-Lead LLP package Description The LM5000 is a monolithic integrated circuit specifically designed and optimized for flyback, boost or forward power converter applications. The internal power switch is rated for a maximum of 80V, with a current limit set to 2A. Protecting the power switch are current limit and thermal shutdown circuits. The current mode control scheme provides excellent rejection of line transients and cycle-by-cycle current limiting. An external compensation pin and the built-in slope compensation allow the user to optimize the frequency compensation. Other distinctive features include softstart to reduce stresses during start-up and an external shutdown pin for remote ON/OFF control. There are two operating frequency ranges available. The LM5000-3 is pin selectable for either 300kHz (FS Grounded) or 700kHz (FS Open). The LM5000-6 is pin selectable for either 600kHz (FS Grounded) or 1.3MHz (FS Open). The device is available in a low profile 16-lead TSSOP package or a thermally enhanced 16-lead LLP package. Applications • Flyback Regulator • Forward Regulator • Boost Regulator • DSL Modems • Distributed Power Converters

LM5000   3.10 <= V in Lower  V   <= V in Upper  V   <= 40.00 V out 1.31 <=  V <= 300.00 I out    A <= 2.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM5001▲ 1A, 75V Boost/Flyback Regulator LM5002▲ 0.5A, 75V Boost/Flyback Regulator LM5020▲ Low Side Controller For Higher Currents Than LM5000 MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance *click for larger image

Datasheet

Title		Size	Date	Other Language
	LM5000 High Voltage Switch Mode Regulator	388 Kbytes	9-Mar-07

Featured Application Notes

Title		Size	Date	Other Language
	AN-1889: Application Note 1889 How to Measure the Loop Transfer Function of Power Supplies	612 Kbytes	14-Oct-08

More Application Notes

Title		Size	Date	Other Language
	AN-1937: Application Note 1937 LM3433 10A to 40A LED Driver Evaluation Board	1559 Kbytes	25-Mar-09
	AN-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge	230 Kbytes	2-Jul-08
	AN-1319: Application Note 1319 Analysis and Design of a Hysteretic Constant Frequency Buck Regulator Using the LM5007	426 Kbytes	25-May-04	中文
	AN-1962: Application Note 1962 LM5032 Interleaved Boost Evaluation Board	2506 Kbytes	27-Aug-09
	AN-1820: Application Note 1820 LM5032 Interleaved Boost Converter	1942 Kbytes	30-May-08
	AN-1956: Application Note 1956 LM5001 Boost Evaluation Board	838 Kbytes	4-Mar-09
	AN-1481: Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs	574 Kbytes	27-Sep-06	日本語 中文
	AN-1445: Application Note 1445 LM5009 Evaluation Board	479 Kbytes	23-Jul-08
	AN-1588: Application Note 1588 LM5001 Evaluation Board	658 Kbytes	18-Mar-07
	AN-1748: Application Note 1748 LM5005 Evaluation Board	159 Kbytes	7-Nov-07
	AN-1574: Application Note 1574 LM5073 Evaluation Board	464 Kbytes	24-Apr-07
	AN-1634: Application Note 1634 Starting Up A Buck Regulator With a Voltage Present At V OUT	71 Kbytes	17-May-07	日本語 中文
	AN-1330: Application Note 1330 LM5008 Evaluation Board	334 Kbytes	7-May-04
	AN-1298: Application Note 1298 LM5007 Evaluation Board	313 Kbytes	29-Jan-04
	AN-1630: Application Note 1630 LM5001 Non-Isolated Flyback Evaluation Board	250 Kbytes	17-Jun-09
	AN-1736: Application Note 1736 LM3433 HB LED Driver Evaluation Kit	1011 Kbytes	4-Feb-08
	AN-1793: Application Note 1793 LM3433 4A to 20A LED Driver Evaluation Board	701 Kbytes	25-Aug-08	中文

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM5000-3MTC/NOPB LM5000-3MTC RoHS	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 131 AVNET-EM Worldwide 184 DIGIKEY Worldwide 392 FUTURE Worldwide 460 NEWARK Americas 132 RS COMPONENTS Worldwide 35	$2.00 each at 1K+ pcs	rail of 92
LM5000SD-3/NOPB RoHS	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 3461 NEWARK Americas 340 RS COMPONENTS Worldwide 44	$2.00 each at 1K+ pcs	reel of 1000
LM5000SD-6/NOPB RoHS	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 1466	$2.00 each at 1K+ pcs	reel of 1000
LM5000SDX-3/NOPB RoHS	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$2.00 each at 1K+ pcs	reel of 4500
LM5000SDX-6/NOPB RoHS	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$2.00 each at 1K+ pcs	reel of 4500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM5000-3MTCEP	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008

Design Tools

Title	Size	Date
Switching power supply design with the LM5000 continuous mode flyback converter
Power Reference Design Library
"Article - Practical Implementation of Negative-Input, Negative-Output Step-Down Switching Converters"

Reference Design

LM5000 Reference Design - 20 White LEDs, 30 mA

LM5000 Reference Design - Sepic Converter, No Transformer: 4-9V Input, 5V @ 0.6A Output

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM5000-3MTCEP	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008