HOME HOME SELECT DESIGN BUY EXPLORE About Us Support My Profile Search

 Products > Analog - Regulators > SwitchingRegulators > LM2576

LM2576  Product Folder

SIMPLE SWITCHER 3A Step-Down Voltage Regulator
  

See Also:		   
LM2596 - more efficient
     LM2599 - improved switching frequency, and efficiency.
     LM2673 - much improved switching frequency
     LM2676 - much improved efficiency and switching frequency.
Generic P/N 2576
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing		 Reliability
Metrics		 Design
Tools		 Application
Notes

WEBENCH Live Simulation!
LM2576 Webench™ Custom
Design/Analyze/Build It
 
6.0 <=		 V in Lower
V		  
<=		 V in Upper
V		  
<= 40.0
V out 1.2 <= V <= 37.0
I out   A <= 3.00
Ambient Temperature °C <= 100

What is Webench?
  
Parametric Table
Temperature Min (deg C) -40 
Temperature Max (deg C) 125 
Multiple Output Capability No 
On/Off Pin Yes 
Error Flag No 
InputMin Voltage (Volt) 4 
InputMax Voltage (Volt) 40, 60 
Output Current (mA) 3000 
Output Voltage (Volt) 12, 15, 3.30, 5, 1.20 
Adjustable Output No, Yes 
Output Range Undefined, 1.23V to 65V 
Switching Frequency (Hz) 52000 
Adj Switch Frequency No 
Sync Pin No 
Efficiency (%) 88, 75, 77 
Flyback No 
Inverting Yes 
Step-Up No 
Step-Down Yes 
RegType Switching Regulator 
-

Datasheet

TitleSize in KbytesDate
View Online
Download
Receive via Email
LM2576 LM2576HV Series SIMPLE SWITCHER 3A Step-Down Voltage Regulator 639 Kbytes 29-Jun-99 View Online Download Receive via Email
LM2576 LM2576HV Series SIMPLE SWITCHER 3A Step-Down Voltage Regulator (JAPANESE)
 869 Kbytes   View Online Download Receive via Email

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

Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
TypePinsMSL/Lead-Free AvailabilityLead
Time		QtySPICEIBISQty$US each
LM2576T-12TO 2205StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.36rail
of
45		NSUZXYTT
LM2576T
-12 P+
7-9 weeks15000
LM2576T-15TO 2205StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.36rail
of
45		NSUZXYTT
LM2576T
-15 P+
7-9 weeks15000
LM2576T-3.3TO 2205StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.36rail
of
45		NSUZXYTT
LM2576T
-3.3 P+
7-9 weeks15000
LM2576T-5.0TO 2205StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.36rail
of
45		NSUZXYTT
LM2576T
-5.0 P+
8-10 weeks50000
LM2576T-ADJTO 2205StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.36rail
of
45		NSUZXYTT
LM2576T
-ADJ P+
8-10 weeks25000
LM2576S-12TO 2635StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.36rail
of
45		NSUZXYTT
LM2576S
-12 P+
13-15 weeks15000
LM2576S-15TO 2635StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.36rail
of
45		NSUZXYTT
LM2576S
-15 P+
13-15 weeks15000
LM2576S-3.3TO 2635StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.36rail
of
45		NSUZXYTT
LM2576S
-3.3 P+
13-15 weeks20000
LM2576S-5.0TO 2635StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.36rail
of
45		NSUZXYTT
LM2576S
-5.0 P+
13-15 weeks25000
LM2576S-ADJTO 2635StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.36rail
of
45		NSUZXYTT
LM2576S
-ADJ P+
13-15 weeks25000
LM2576SX-12TO 2635StatusFull productionN/AN/A 1K+$1.36reel
of
500		NSUZXYTT
LM2576S
-12 P+
13-15 weeks15000
LM2576SX-15TO 2635StatusFull productionN/AN/A 
Buy Now		1K+$1.36reel
of
500		NSUZXYTT
LM2576S
-15 P+
13-15 weeks15000
LM2576SX-3.3TO 2635StatusFull productionN/AN/A 1K+$1.36reel
of
500		NSUZXYTT
LM2576S
-3.3 P+
13-16 weeks15000
LM2576SX-5.0TO 2635StatusFull productionN/AN/A 
Buy Now 		1K+$1.36reel
of
500		NSUZXYTT
LM2576S
-5.0 P+
13-15 weeks50000
LM2576SX-ADJTO 2635StatusFull productionN/AN/A 
Buy Now		1K+$1.36reel
of
500		NSUZXYTT
LM2576S
-ADJ P+
13-15 weeks25000
LM2576-12 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2576-15 MDCUnpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2576-3.3 MDCUnpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2576-5.0 MDCUnpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2576-ADJ MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2576HV-5 MDCUnpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2576-12 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2576-15 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2576-3.3 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2576-5.0 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2576-ADJ MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2576HV-5 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0

General Description

The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.

The LM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink is required.

A standard series of inductors optimized for use with the LM2576 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

Features

  • 3.3V, 5V, 12V, 15V, and adjustable output versions
  • Adjustable version output voltage range, 1.23V to 37V (57V for HV version) ±4% max over line and load conditions
  • Guaranteed 3A output current
  • Wide input voltage range, 40V up to 60V for HV version
  • Requires only 4 external components
  • 52 kHz fixed frequency internal oscillator
  • TTL shutdown capability, low power standby mode
  • High efficiency
  • Uses readily available standard inductors
  • Thermal shutdown and current limit protection
  • P+ Product Enhancement tested

Applications

  • Simple high-efficiency step-down (buck) regulator
  • Efficient pre-regulator for linear regulators
  • On-card switching regulators
  • Positive to negative converter (Buck-Boost)

Reliability Metrics

Part Number Process Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LM2576-12 MDCSLM0350000015000003424108012
LM2576-12 MWCSLM0350000015000003424108012
LM2576-15 MDCSLM0350000015000003424108012
LM2576-15 MWCSLM0350000015000003424108012
LM2576-3.3 MDCSLM0350000015000003424108012
LM2576-3.3 MWCSLM0350000015000003424108012
LM2576-5.0 MDCSLM0350000015000003424108012
LM2576-5.0 MWCSLM0350000015000003424108012
LM2576-ADJ MDCSLM0350000015000003424108012
LM2576-ADJ MWCSLM0350000015000003424108012
LM2576HV-5 MDCSLM0350000015000003424108012
LM2576HV-5 MWCSLM0350000015000003424108012
LM2576S-12SLM0350000015000003424108012
LM2576S-15SLM0350000015000003424108012
LM2576S-3.3SLM0350000015000003424108012
LM2576S-5.0SLM0350000015000003424108012
LM2576S-ADJSLM0350000015000003424108012
LM2576SX-12SLM0350000015000003424108012
LM2576SX-15SLM0350000015000003424108012
LM2576SX-3.3SLM0350000015000003424108012
LM2576SX-5.0SLM0350000015000003424108012
LM2576SX-ADJSLM0350000015000003424108012
LM2576T-12SLM0350000015000003424108012
LM2576T-15SLM0350000015000003424108012
LM2576T-3.3SLM0350000015000003424108012
LM2576T-5.0SLM0350000015000003424108012
LM2576T-ADJSLM0350000015000003424108012

For more information on Reliablitity Metrics, please click here.


Design Tools

TitleSize in KbytesDate
View Online
Download
Receive via Email
SimpleSwitcher® DC-DC Converters Design Software 9 Kbytes 28-Jul-2003 View    

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

Application Notes

TitleSize in KbytesDate
View Online
Download
Receive via Email
AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment 188 Kbytes 1-Oct-02 View Online Download Receive via Email
AN-1149: Application Note 1149 Layout Guidelines for Switching Power Supplies 113 Kbytes 26-Sep-02 View Online Download Receive via Email
AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines 229 Kbytes 1-Oct-02 View Online Download Receive via Email
AN-1246: Application Note 1246 Stresses in Wide Input DC-DC Converters 272 Kbytes 26-Sep-02 View Online Download Receive via Email
AN-556: Application Note 556 Introduction to Power Supplies 159 Kbytes 25-Sep-02 View Online Download Receive via Email
AN-776: Application Note 776 20 Watt Simple Switcher Forward Converter 459 Kbytes 26-Sep-02 View Online Download Receive via Email
AN-946: Application Note 946 High-Efficiency 3A Battery Chargers Use LM2576 Regulators 109 Kbytes 3-Oct-02 View Online Download Receive via Email
Application Note 946 High-Efficiency 3A Battery Chargers Use LM2576 Regulators (JAPANESE)
 72 Kbytes   View Online Download Receive via Email

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

[Information as of 15-Jan-2004]

Website Guide • About "Cookies" • National is QS 9000 Certified • Privacy/Security Statement • Contact Us/Feedback
Site Terms & Conditions of Use • Copyright 2003© National Semiconductor Corporation