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LM2594

ACTIVE

SIMPLE SWITCHER® 40V, 500mA Low Component Count Step-Down Regulator

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Data sheet

A newer version of this product is available

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Same functionality with different pin-out to the compared device.
TPSM365R6 ACTIVE 3-V to 65-V input, 1-V to 13-V output, 0.6-A synchronous buck converter power module Next-generation with spread spectrum and frequency synchronization.
LMR36506 ACTIVE 3-V to 65-V, 0.6-A ultra-small synchronous buck converter with 4 μA IQ Next-generation converter with smaller package size, greater efficiency, and lower quiescent current.

LM2594

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck Iout (max) (A) 0.5 Vin (max) (V) 40 Vin (min) (V) 4.5 Vout (max) (V) 37 Vout (min) (V) 3.3 Features Enable, Overcurrent protection Control mode Voltage mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.005 Duty cycle (max) (%) 100
Rating Catalog Topology Buck Iout (max) (A) 0.5 Vin (max) (V) 40 Vin (min) (V) 4.5 Vout (max) (V) 37 Vout (min) (V) 3.3 Features Enable, Overcurrent protection Control mode Voltage mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.005 Duty cycle (max) (%) 100
PDIP (P) 8 92.5083 mm² (9.81 mm × 9.43 mm) SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm)
  • New product available:
  • For faster time to market:
  • 3.3-V, 5-V, 12-V, and adjustable output versions
  • Adjustable version output voltage range: 1.2 V to 37 V (57-V for the HV version), ±4% maximum over line and load conditions
  • Available in 8-pin surface-mount SOIC and 8-pin PDIP packages
  • Ensured 0.5-A output current
  • Input voltage range up to 60 V
  • Requires only four external components
  • 150-kHz fixed-frequency internal oscillator
  • TTL shutdown capability
  • Low power standby mode, I Q typically 85 µA
  • High efficiency
  • Uses readily-available standard inductors
  • Thermal shutdown and current-limit protection
  • Create a custom design using the LM2594HV with the WEBENCH Power Designer
  • New product available:
  • For faster time to market:
  • 3.3-V, 5-V, 12-V, and adjustable output versions
  • Adjustable version output voltage range: 1.2 V to 37 V (57-V for the HV version), ±4% maximum over line and load conditions
  • Available in 8-pin surface-mount SOIC and 8-pin PDIP packages
  • Ensured 0.5-A output current
  • Input voltage range up to 60 V
  • Requires only four external components
  • 150-kHz fixed-frequency internal oscillator
  • TTL shutdown capability
  • Low power standby mode, I Q typically 85 µA
  • High efficiency
  • Uses readily-available standard inductors
  • Thermal shutdown and current-limit protection
  • Create a custom design using the LM2594HV with the WEBENCH Power Designer

The LM2594xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version, and are packaged in a 8-pin PDIP and a 8-pin surface-mount SOIC 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 new product, LMR36506, offers reduced BOM cost, higher efficiency, and smaller solution size with many other features. See the Device Comparison Table to compare specs. Start WEBENCH Design with LMR36506.

A standard series of inductors (both through-hole and surface-mount types) are available from several different manufacturers optimized for use with the LM2594xx series. This feature greatly simplifies the design of switch-mode power supplies.

Other features include an ensured ±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 overtemperature shutdown for complete protection under fault conditions.

The LM2594HV is for applications requiring an input voltage up to 60 V.

The LM2594xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version, and are packaged in a 8-pin PDIP and a 8-pin surface-mount SOIC 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 new product, LMR36506, offers reduced BOM cost, higher efficiency, and smaller solution size with many other features. See the Device Comparison Table to compare specs. Start WEBENCH Design with LMR36506.

A standard series of inductors (both through-hole and surface-mount types) are available from several different manufacturers optimized for use with the LM2594xx series. This feature greatly simplifies the design of switch-mode power supplies.

Other features include an ensured ±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 overtemperature shutdown for complete protection under fault conditions.

The LM2594HV is for applications requiring an input voltage up to 60 V.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LM2594xx SIMPLE SWITCHER Power Converter, 150-kHz, 0.5-A, Step-Down Voltage Regulator datasheet (Rev. F) PDF | HTML May 31, 2023
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML Mar 25, 2024
Technical article How to increase system reliability and simplify design using DC/DC converters PDF | HTML Jun 13, 2016
Technical article The importance of accurate switching frequency and current limit when selecting bu PDF | HTML Apr 19, 2016
Technical article Advantages of leaded packages in robust industrial designs PDF | HTML Mar 8, 2016
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep 12, 2014
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr 24, 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr 23, 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr 23, 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr 23, 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr 23, 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr 23, 2013
Application note AN-1081 Low-Cost Low-Parts-Count DC/DC Converter With Multiple Outputs (Rev. B) Apr 23, 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) Apr 23, 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) Apr 23, 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr 23, 2013
Application note Simple Techniques Minimize Cross-Coupling in Distributed Power Systems Mar 21, 2007
Application note Buck Converters Provide a Battery Charger and System Power Mar 21, 2007
Application note Input and Output Capacitor Selection Sep 19, 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul 12, 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) May 3, 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

LM2594-ADJ PSpice Transient Model (Rev. A)

SNVMA69A.ZIP (82 KB) - PSpice model
Supported products & hardware
Simulation model

LM2594-ADJ Unencrypted PSpice Transient Model (Rev. A)

SNVMA68A.ZIP (2 KB) - PSpice model
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
PDIP (P) 8 Ultra Librarian
SOIC (D) 8 Ultra Librarian
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