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 LM3578A▲ LM2578A With 0 To 125C Temperature Range 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
	LM2578A Switching Regulator	1378 Kbytes	7-Apr-05	日本語

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2578AM/NOPB LM2578AM RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 7 AVNET-EM Worldwide 292 DIGI-KEY Worldwide 590 FARNELL Europe and Asia 155 MOUSER Worldwide 176 NEWARK Americas 255 RS COMPONENTS Worldwide 40 TAYLOR Americas 1492	$1.42 each at 1K+ pcs	rail of 95
LM2578AMX/NOPB LM2578AMX RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.42 each at 1K+ pcs	reel of 2500
LM2578AN/NOPB LM2578AN RoHS Status	MDIP	Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 258 AVNET-EM Worldwide 251 DIGI-KEY Worldwide 387 MOUSER Worldwide 280 NEWARK Americas 26 TAYLOR Americas 258	$1.42 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 LM2578A.

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 LM2578A 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
LM2578AM/NOPB LM2578AM	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	N/A	N/A	NSZXTT 2578 AM
LM2578AMX/NOPB LM2578AMX	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	N/A	N/A	NSZXTT 2578 AM
LM2578AN/NOPB LM2578AN	508.252 510.002	MDIP	8	1 1	NA NA	Detail	N/A	N/A	NSUZXYTTE# LM2578AN

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 LM2578A.

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 LM2578A 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)
LM2578AM	SLM	0	44046	0	0	3532500	1	1002356520
LM2578AMX	SLM	0	44046	0	0	3532500	1	1002356520
LM2578AN	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 LM2578A.

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 LM2578A is located at RoHS Status.