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LM2597  Product Folder

SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator
  

See Also:		   
LM2671 - HIGHER SWITCHING FREQUENCY (260 - 400 KHZ)
     LM2598 - 1.0A VERSION
Generic P/N 2597
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing		 Reliability
Metrics		 Design
Tools		 Application
Notes

WEBENCH Live Simulation!
LM2597 Webench™ Custom
Design/Analyze/Build It
 
4.5 <=		 V in Lower
V		  
<=		 V in Upper
V		  
<= 40.0
V out 1.2 <= V <= 40.0
I out   A <= 0.50
Ambient Temperature °C <= 100

What is Webench?
  
Parametric Table
Temperature Min (deg C) -40 
Temperature Max (deg C) 125 
On/Off Pin Yes 
Error Flag Yes 
InputMin Voltage (Volt) 15, 4.75, 7, 4.50 
InputMax Voltage (Volt) 60, 40 
Output Current (mA) 500 
Output Voltage (Volt) 15, 3.30, 5, 12 
Adjustable Output No, Yes 
Output Range 1.2V-57V, 1.2V-37V 
Switching Frequency (Hz) 150000 
Adj Switch Frequency No 
Sync Pin No 
Efficiency (%) 88, 80, 82 
Flyback No 
Inverting Yes 
Step-Up No 
Step-Down Yes 
RegType Switching Regulator 
-

Datasheet

TitleSize in KbytesDate
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Download
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LM2597 LM2597HV SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator, with Features 900 Kbytes 23-Jan-01 View Online Download Receive via Email
LM2597 LM2597HV SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator, with Features (JAPANESE)
 1142 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
LM2597HVM-12SOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$2.00rail
of
95		NSXYTT
2597H
M-12
8-10 weeks25000
LM2597HVM-3.3SOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$2.00rail
of
95		NSXYTT
2597H
M-3.3
8-10 weeks25000
LM2597HVM-5.0SOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$2.00rail
of
95		NSXYTT
2597H
M-5.0
8-10 weeks20000
LM2597HVM-ADJSOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$2.00rail
of
95		NSXYTT
2597H
M-ADJ
8-10 weeks50000
LM2597M-12SOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.59rail
of
95		NSXYTT
2597
M-12
4-6 weeks25000
LM2597M-3.3SOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.59rail
of
95		NSXYTT
2597
M-3.3
6-8 weeks25000
LM2597M-5.0SOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.59rail
of
95		NSXYTT
2597
M-5.0
8-10 weeks25000
LM2597M-ADJSOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.59rail
of
95		NSXYTT
2597
M-ADJ
8-10 weeks50000
LM2597HVMX-12SOIC NARROW8StatusFull productionN/AN/A 
Buy Now		1K+$2.00reel
of
2500		NSXYTT
2597H
M-12
8-10 weeks25000
LM2597HVMX-3.3SOIC NARROW8StatusFull productionN/AN/A 1K+$2.00reel
of
2500		NSXYTT
2597H
M-3.3
6-8 weeks25000
LM2597HVMX-5.0SOIC NARROW8StatusFull productionN/AN/A 1K+$2.00reel
of
2500		NSXYTT
2597H
M-5.0
8-10 weeks50000
LM2597HVMX-ADJSOIC NARROW8StatusFull productionN/AN/A 
Buy Now		1K+$2.00reel
of
2500		NSXYTT
2597H
M-ADJ
8-10 weeks50000
LM2597MX-12SOIC NARROW8StatusFull productionN/AN/A 1K+$1.59reel
of
2500		NSXYTT
2597
M-12
4-6 weeks25000
LM2597MX-3.3SOIC NARROW8StatusFull productionN/AN/A 1K+$1.59reel
of
2500		NSXYTT
2597
M-3.3
6-8 weeks25000
LM2597MX-5.0SOIC NARROW8StatusFull productionN/AN/A 1K+$1.59reel
of
2500		NSXYTT
2597
M-5.0
8-10 weeks25000
LM2597MX-ADJSOIC NARROW8StatusFull productionN/AN/A 
Buy Now		1K+$1.59reel
of
2500		NSXYTT
2597
M-ADJ
8-10 weeks50000
LM2597HVN-12MDIP8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$2.00rail
of
40		NSUZXYTT
LM2597HV
N-12 P+
8-10 weeks25000
LM2597HVN-3.3MDIP8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$2.00rail
of
40		NSUZXYTT
LM2597HV
N-3.3 P+
8-10 weeks25000
LM2597HVN-5.0MDIP8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$2.00rail
of
40		NSUZXYTT
LM2597HV
N-5.0 P+
8-10 weeks25000
LM2597HVN-ADJMDIP8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$2.00rail
of
40		NSUZXYTT
LM2597HV
N-ADJ P+
8-10 weeks50000
LM2597N-12MDIP8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.59rail
of
40		NSUZXYTT
LM2597N
-12 P+
4-6 weeks25000
LM2597N-3.3MDIP8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.59rail
of
40		NSUZXYTT
LM2597N
-3.3 P+
6-8 weeks25000
LM2597N-5.0MDIP8StatusFull productionN/AN/ASamples
Buy Now		1K+$1.59rail
of
40		NSUZXYTT
LM2597N
-5.0 P+
8-10 weeks25000
LM2597N-ADJMDIP8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.59rail
of
40		NSUZXYTT
LM2597N
-ADJ P+
8-10 weeks50000
LM2597-3.3 MDAUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2597-5.0 MDAUnpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2597-3.3 MWAWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2597-5.0 MWAWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2597-12 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2597-ADJ MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2597HV-5 MDCUnpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2597HV3.3 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2597-12 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2597-ADJ MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2597HV-5 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2597HV3.3 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0

General Description

The LM2597/LM2597HV series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version, and are packaged in an 8-lead DIP and an 8-lead surface mount package.

This series of switching regulators is similar to the LM2594 series, with additional supervisory and performance features added.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation†, improved line and load specifications, fixed-frequency oscillator, Shutdown# /Soft-start, error flag delay and error flag output.

The LM2597/LM2597HV series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because of its high efficiency, the copper traces on the printed circuit board are normally the only heat sinking needed.

A standard series of inductors (both through hole and surface mount types) are available from several different manufacturers optimized for use with the LM2597/LM2597HV series. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a guaranteed ±4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 85 µA standby current. Self protection features include a two stage current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.

The LM2597HV is for use in applications requiring and input voltage up to 60V.

Features

  • 3.3V, 5V, 12V, and adjustable output versions
  • Adjustable version output voltage range, 1.2V to 37V (57V for HV version)±4% max over line and load conditions
  • Guaranteed 0.5A output current
  • Available in 8-pin surface mount and DIP-8 package
  • Input voltage range up to 60V
  • 150 kHz fixed frequency internal oscillator
  • Shutdown# /Soft-start
  • Out of regulation error flag
  • Error output delay
  • Bias Supply Pin (VBS) for internal circuitry improves efficiency at high input voltages
  • Low power standby mode, IQ typically 85 µA
  • High Efficiency
  • Uses readily available standard inductors
  • Thermal shutdown and current limit protection

Applications

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

Reliability Metrics

Part Number Process Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LM2597-12 MDCLB3000177000011000004311012542
LM2597-12 MWCLB3000177000011000004311012542
LM2597-3.3 MDALB3000177000011000004311012542
LM2597-3.3 MWALB3000177000011000004311012542
LM2597-5.0 MDALB3000177000011000004311012542
LM2597-5.0 MWALB3000177000011000004311012542
LM2597-ADJ MDCLB3000177000011000004311012542
LM2597-ADJ MWCLB3000177000011000004311012542
LM2597HV-5 MDCLB3000177000011000004311012542
LM2597HV-5 MWCLB3000177000011000004311012542
LM2597HV3.3 MDCLB3000177000011000004311012542
LM2597HV3.3 MWCLB3000177000011000004311012542
LM2597HVM-12LB3000177000011000004311012542
LM2597HVM-3.3LB3000177000011000004311012542
LM2597HVM-5.0LB3000177000011000004311012542
LM2597HVM-ADJLB3000177000011000004311012542
LM2597HVMX-12LB3000177000011000004311012542
LM2597HVMX-3.3LB3000177000011000004311012542
LM2597HVMX-5.0LB3000177000011000004311012542
LM2597HVMX-ADJLB3000177000011000004311012542
LM2597HVN-12LB3000177000011000004311012542
LM2597HVN-3.3LB3000177000011000004311012542
LM2597HVN-5.0LB3000177000011000004311012542
LM2597HVN-ADJLB3000177000011000004311012542
LM2597M-12LB3000177000011000004311012542
LM2597M-3.3LB3000177000011000004311012542
LM2597M-5.0LB3000177000011000004311012542
LM2597M-ADJLB3000177000011000004311012542
LM2597MX-12LB3000177000011000004311012542
LM2597MX-3.3LB3000177000011000004311012542
LM2597MX-5.0LB3000177000011000004311012542
LM2597MX-ADJLB3000177000011000004311012542
LM2597N-12LB3000177000011000004311012542
LM2597N-3.3LB3000177000011000004311012542
LM2597N-5.0LB3000177000011000004311012542
LM2597N-ADJLB3000177000011000004311012542

For more information on Reliablitity Metrics, please click here.


Design Tools

TitleSize in KbytesDate
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SimpleSwitcher® DC-DC Converters Design Software 9 Kbytes 28-Jul-2003 View    

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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

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

[Information as of 15-Jan-2004]

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