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LM2594  Product Folder

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

See Also:		   
LM2597 - Error Flag, Softstart and Error output delay
     LM2674 - 260Khz Switching Frequency, Better performance
     LM2671 - HAS SYNC PIN, IMPROVED SWITCHING FREQUENCY AND EFFICIENCY
     LM2594HV - UP TO 60V INPUT VOLTAGE
     LM2619 - 600KHZ, LOW POWER, SYNCHRONOUS RECTIFICATION FOR HIGHER EFFICIENCY
     LM2595 - 1A OUTPUT CURRENT
Generic P/N 2594
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing		 Reliability
Metrics		 Design
Tools		 Application
Notes

WEBENCH Live Simulation!
LM2594 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 
Multiple Output Capability No 
On/Off Pin Yes 
Error Flag No, Yes 
InputMin Voltage (Volt) 15, 4.75, 7, 4.50 
InputMax Voltage (Volt) 40, 60 
Output Current (mA) 500 
Output Voltage (Volt) 12, 3.30, 5 
Adjustable Output No, Yes 
Output Range 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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LM2594 LM2594HV SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator 739 Kbytes 22-Aug-00 View Online Download Receive via Email
LM2594 LM2594HV SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator (JAPANESE)
 832 Kbytes   View Online Download Receive via Email

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Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
TypePinsMSL/Lead-Free AvailabilityLead
Time		QtySPICEIBISQty$US each
LM2594M-12SOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.28rail
of
95		NSXYTT
2594
M-12
4-6 weeks25000
LM2594M-3.3SOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.28rail
of
95		NSXYTT
2594
M-3.3
6-8 weeks25000
LM2594M-5.0SOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.28rail
of
95		NSXYTT
2594
M-5.0
8-10 weeks25000
LM2594M-ADJSOIC NARROW8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.28rail
of
95		NSXYTT
2594
M-ADJ
8-10 weeks50000
LM2594MX-12SOIC NARROW8StatusFull productionN/AN/A 1K+$1.28reel
of
2500		NSXYTT
2594
M-12
4-6 weeks25000
LM2594MX-3.3SOIC NARROW8StatusFull productionN/AN/A 
Buy Now		1K+$1.28reel
of
2500		NSXYTT
2594
M-3.3
6-8 weeks25000
LM2594MX-5.0SOIC NARROW8StatusFull productionN/AN/A 
Buy Now 		1K+$1.28reel
of
2500		NSXYTT
2594
M-5.0
8-10 weeks50000
LM2594MX-ADJSOIC NARROW8StatusFull productionN/AN/A 
Buy Now		1K+$1.28reel
of
2500		NSXYTT
2594
M-ADJ
8-10 weeks50000
LM2594N-12MDIP8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.28rail
of
40		NSUZXYTT
LM2594N
-12 P+
4-6 weeks25000
LM2594N-3.3MDIP8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.28rail
of
40		NSUZXYTT
LM2594N
-3.3 P+
6-8 weeks25000
LM2594N-5.0MDIP8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.28rail
of
40		NSUZXYTT
LM2594N
-5.0 P+
8-10 weeks25000
LM2594N-ADJMDIP8StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.28rail
of
40		NSUZXYTT
LM2594N
-ADJ P+
8-10 weeks50000
LM2594-5.0 MDAUnpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2594-5.0 MWAWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2594-12 MDCUnpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2594-3.3 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2594-ADJ MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2594HV-12 MDCUnpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2594HV3.3 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2594HV5.0 MDCUnpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2594HVADJ MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2594-12 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2594-3.3 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2594-ADJ MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2594HV-12 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2594HV3.3 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2594HV5.0 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2594HVADJ MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0

General Description

The LM2594/LM2594HV 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 a 8-lead DIP and a 8-lead surface mount package.

Requiring a minimum number of external components, these regulators are simple to use and feature internal frequency compensation†, a fixed-frequency oscillator, and improved line and load regulation specifications.

The LM2594/LM2594HV 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 LM2594/LM2594HV 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 frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.

The LM2594HV is for applications requiring an 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 the HV version)±4% max over line and load conditions
  • Available in 8-pin surface mount and DIP-8 package
  • Guaranteed 0.5A output current
  • Input voltage range up to 60V
  • Requires only 4 external components
  • 150 kHz fixed frequency internal oscillator
  • TTL Shutdown capability
  • 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 convertor

Reliability Metrics

Part Number Process Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LM2594-12 MDCLB3000177000011000004311012542
LM2594-12 MWCLB3000177000011000004311012542
LM2594-3.3 MDCLB3000177000011000004311012542
LM2594-3.3 MWCLB3000177000011000004311012542
LM2594-5.0 MDALB3000177000011000004311012542
LM2594-5.0 MWALB3000177000011000004311012542
LM2594-ADJ MDCLB3000177000011000004311012542
LM2594-ADJ MWCLB3000177000011000004311012542
LM2594HV-12 MDCLB3000177000011000004311012542
LM2594HV-12 MWCLB3000177000011000004311012542
LM2594HV3.3 MDCLB3000177000011000004311012542
LM2594HV3.3 MWCLB3000177000011000004311012542
LM2594HV5.0 MDCLB3000177000011000004311012542
LM2594HV5.0 MWCLB3000177000011000004311012542
LM2594HVADJ MDCLB3000177000011000004311012542
LM2594HVADJ MWCLB3000177000011000004311012542
LM2594M-12LB3000177000011000004311012542
LM2594M-3.3LB3000177000011000004311012542
LM2594M-5.0LB3000177000011000004311012542
LM2594M-ADJLB3000177000011000004311012542
LM2594MX-12LB3000177000011000004311012542
LM2594MX-3.3LB3000177000011000004311012542
LM2594MX-5.0LB3000177000011000004311012542
LM2594MX-ADJLB3000177000011000004311012542
LM2594N-12LB3000177000011000004311012542
LM2594N-3.3LB3000177000011000004311012542
LM2594N-5.0LB3000177000011000004311012542
LM2594N-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
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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-1197: Application Note 1197 Selecting Inductors for Buck Converters 371 Kbytes 1-Oct-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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