Features Inverting and non-inverting feedback inputs 1.0V reference at inputs Operates from supply voltages of 2V to 40V Output current up to 750 mA, saturation less than 0.9V Current limit and thermal shut down Duty cycle up to 90% Description The LM2578A is a switching regulator which can easily be set up for such DC-to-DC voltage conversion circuits as the buck, boost, and inverting configurations. The LM2578A features a unique comparator input stage which not only has separate pins for both the inverting and non-inverting inputs, but also provides an internal 1.0V reference to each input, thereby simplifying circuit design and p.c. board layout. The output can switch up to 750 mA and has output pins for its collector and emitter to promote design flexibility. An external current limit terminal may be referenced to either the ground or the Vin terminal, depending upon the application. In addition, the LM2578A has an on board oscillator, which sets the switching frequency with a single external capacitor from <1 Hz to 100 kHz (typical). The LM2578A is an improved version of the LM2578, offering higher maximum ratings for the total supply voltage and output transistor emitter and collector voltages. Applications Switching regulators in buck, boost, inverting, and single-ended transformer configurations Motor speed control Lamp flasher

Also Recommended LM25575▲ Emulated Current Mode 1MHz SIMPLE SWITCHER 1A Step Down Converter With Optimizer Tool In Webench LM2672▲ SIMPLE SWITCHER 260KHz 1A Step Down Converter With Soft Start, Sync Pin And Vin Feed Forward LM2675▲ SIMPLE SWITCHER 260KHz 1A Step Down Converter With Vin Feed Forward LM2578A▲ LM3578A With Extended Temperature Range -40 To 125C LM2595▲ SIMPLE SWITCHER 150KHz 1A Step Down Converter LM2598▲ SIMPLE SWITCHER 150KHz 1A Step Down Converter With Soft Start And Error Flag Temp range: LM2578A: -40 to +125C; LM3578A: 0 to 125C

Typical Application *click for larger image Temp range: LM2578A: -40 to +125C; LM3578A: 0 to 125C	Connection Diagram *click for larger image

Datasheets

Title		Size	Date	Other Language
	LM3578A Switching Regulator	1378 Kbytes	7-Apr-05	日本語

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
	AN-1066: Application Note 1066 Low Cost Boost Converters Using LM3578A	206 Kbytes	26-Sep-02

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM3578AM/NOPB LM3578AM RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 693 AVNET-EM Worldwide 355 BRITESTONE South Korea 775 DIGI-KEY Worldwide 5459 FARNELL Europe and Asia 440 MOUSER Worldwide 315 RS COMPONENTS Worldwide 70 TAYLOR Americas 693	$0.78 each at 1K+ pcs	rail of 95
LM3578AMX/NOPB LM3578AMX RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 2500 RSL MICRO Asia Pacific 2500	$0.78 each at 1K+ pcs	reel of 2500
LM3578AN/NOPB LM3578AN RoHS Status	MDIP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 9 AVNET-EM Worldwide 381 DIGI-KEY Worldwide 450 FARNELL Europe and Asia 534 MOUSER Worldwide 166 NEWARK Americas 320 RS COMPONENTS Worldwide 237 TAYLOR Americas 5393	$0.78 each at 1K+ pcs	rail of 40

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM3578A.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3578A is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM3578AM/NOPB LM3578AM	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	N/A	N/A	NSZXTT 3578 AM
LM3578AMX/NOPB LM3578AMX	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	N/A	N/A	NSZXTT 3578 AM
LM3578AN/NOPB LM3578AN	508.252 510.002	MDIP	8	1 1	NA NA	Detail	N/A	N/A	NSUZXYTTE# LM3578AN

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM3578A.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3578A is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3578AM	SLM	0	44046	0	0	3532500	1	1002356520
LM3578AMX	SLM	0	44046	0	0	3532500	1	1002356520
LM3578AN	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.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM3578A.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3578A is located at RoHS Status.