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LM2598

ACTIVE

4.5V to 40V, 1A SIMPLE SWITCHER® buck converter

A newer version of this product is available

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LMR54410 ACTIVE SIMPLE SWITCHER® power converter 4.5-V to 36-V, 1-A, synchronous buck with 80-µA IQ Next-generation with lower IQ.
TPSM33615 ACTIVE 3-V to 36-V input, 1 to 15-V output, 1.5-A synchronous buck power module Next-generation power module with spread spectrum and frequency synchronization.

Product details

Vin (min) (V) 4.5 Vin (max) (V) 40 Vout (min) (V) 3.3 Vout (max) (V) 37 Iout (max) (A) 1 Iq (typ) (mA) 5 Switching frequency (min) (kHz) 110 Switching frequency (max) (kHz) 173 Features Over Current Protection, Power good Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Voltage mode Duty cycle (max) (%) 100 Type Converter
Vin (min) (V) 4.5 Vin (max) (V) 40 Vout (min) (V) 3.3 Vout (max) (V) 37 Iout (max) (A) 1 Iq (typ) (mA) 5 Switching frequency (min) (kHz) 110 Switching frequency (max) (kHz) 173 Features Over Current Protection, Power good Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Voltage mode Duty cycle (max) (%) 100 Type Converter
TO-220 (NDZ) 7 82.6008 mm² 10.16 x 8.13 TO-263 (KTW) 7 153.924 mm² 10.1 x 15.24
  • 3.3-V, 5-V, 12-V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range, 1.2-V
    to 37-V ±4% Max Over Line and Load Conditions
  • 1-A Output Current
  • Available in 7-Pin TO-220 and DDPAK (Surface
    Mount) Package
  • Input Voltage Range Up to 40 V
  • Excellent Line and Load Regulation Specifications
  • 150 kHz Fixed Frequency Internal Oscillator
  • Shutdown/Soft-start
  • Out of Regulation Error Flag
  • Error Output Delay
  • Low Power Standby Mode, IQ, Typically 85 µA
  • High Efficiency
  • Uses Readily Available Standard Inductors
  • Thermal Shutdown and Current Limit Protection
  • 3.3-V, 5-V, 12-V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range, 1.2-V
    to 37-V ±4% Max Over Line and Load Conditions
  • 1-A Output Current
  • Available in 7-Pin TO-220 and DDPAK (Surface
    Mount) Package
  • Input Voltage Range Up to 40 V
  • Excellent Line and Load Regulation Specifications
  • 150 kHz Fixed Frequency Internal Oscillator
  • Shutdown/Soft-start
  • Out of Regulation Error Flag
  • Error Output Delay
  • Low Power Standby Mode, IQ, Typically 85 µA
  • High Efficiency
  • Uses Readily Available Standard Inductors
  • Thermal Shutdown and Current Limit Protection

The LM2598 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1-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.

The LM2598 is a member of the LM259x family.

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 LM2598 series operates at a switching frequency of 150 kHz, thus allowing smaller sized filter components than what would be required with lower-frequency switching regulators. Available in a standard 7-lead TO-220 package with several different lead bend options, and a 7-lead DDPAK surface mount package. Typically, for output voltages less than 12 V, and ambient temperatures less than 50°C, no heat sink is required.

A standard series of inductors (both through hole and surface mount types) are available from several different manufacturers optimized for use with the LM2598. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a specified ±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 overtemperature shutdown for complete protection under fault conditions.

The LM2598 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1-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.

The LM2598 is a member of the LM259x family.

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 LM2598 series operates at a switching frequency of 150 kHz, thus allowing smaller sized filter components than what would be required with lower-frequency switching regulators. Available in a standard 7-lead TO-220 package with several different lead bend options, and a 7-lead DDPAK surface mount package. Typically, for output voltages less than 12 V, and ambient temperatures less than 50°C, no heat sink is required.

A standard series of inductors (both through hole and surface mount types) are available from several different manufacturers optimized for use with the LM2598. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a specified ±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 overtemperature shutdown for complete protection under fault conditions.

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Technical documentation

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Type Title Date
* Data sheet LM2598 SIMPLE SWITCHER® Power Converter 150-kHz 1-A Step-Down Voltage Regulator, With Features datasheet (Rev. D) PDF | HTML 31 May 2016
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mar 2024
Technical article How to increase system reliability and simplify design using DC/DC converters PDF | HTML 13 Jun 2016
Technical article The importance of accurate switching frequency and current limit when selecting bu PDF | HTML 19 Apr 2016
Technical article Advantages of leaded packages in robust industrial designs PDF | HTML 08 Mar 2016
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 12 Sep 2014
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 Apr 2013
Application note AN-1081 Low-Cost Low-Parts-Count DC/DC Converter With Multiple Outputs (Rev. B) 23 Apr 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 23 Apr 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 23 Apr 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 23 Apr 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 23 Apr 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 23 Apr 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 23 Apr 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 23 Apr 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23 Apr 2013
Application note Simple Techniques Minimize Cross-Coupling in Distributed Power Systems 21 Mar 2007
Application note Input and Output Capacitor Selection 19 Sep 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 12 Jul 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) 03 May 2004

Design & development

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Simulation model

LM2598_ADJ PSpice Transient Model

SNVMAE1.ZIP (101 KB) - PSpice Model
Simulation model

LM2598_ADJ Unencrypted PSpice Transient Model

SNVMAE2.ZIP (3 KB) - PSpice Model
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TO-220 (NDZ) 7 View options
TO-263 (KTW) 7 View options

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