Home Power management AC/DC & DC/DC converters (integrated FET)
Home
Power management
AC/DC & DC/DC converters (integrated FET)

LM2585

ACTIVE

4-V to 40-V, 3-A step-up wide VIN flyback regulator

Order now
Data sheet

A newer version of this product is available

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
LM5158 ACTIVE 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum Newer device with higher Vout capability and higher switch current

LM2585

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Boost, Flyback, Forward, SEPIC Type Converter Vin (min) (V) 4 Vin (max) (V) 40 Switching frequency (min) (kHz) 85 Switching frequency (max) (kHz) 115 Features Nonsynchronous rectification, UVLO Fixed Vout (min) (V) 1.23 Vout (max) (V) 60 Iq (typ) (µA) 11000 Duty cycle (max) (%) 98
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Boost, Flyback, Forward, SEPIC Type Converter Vin (min) (V) 4 Vin (max) (V) 40 Switching frequency (min) (kHz) 85 Switching frequency (max) (kHz) 115 Features Nonsynchronous rectification, UVLO Fixed Vout (min) (V) 1.23 Vout (max) (V) 60 Iq (typ) (µA) 11000 Duty cycle (max) (%) 98
TO-220 (NDH) 5 86.0552 mm² 10.16 x 8.47 TO-263 (KTT) 5 154.8384 mm² 10.16 x 15.24
  • Requires Few External Components
  • Family of Standard Inductors and Transformers
  • NPN Output Switches 3 A, Can Stand Off 65 V
  • Wide Input Voltage Range: 4 V to 40 V
  • Current-mode Operation for Improved Transient Response, Line Regulation, and Current Limit
  • 100-kHz Switching Frequency
  • Internal Soft-Start Function Reduces In-rush Current During Start-up
  • Output Transistor Protected by Current Limit, Undervoltage Lockout, and Thermal Shutdown
  • System Output Voltage Tolerance of ±4% Maximum Over Line and Load Conditions
  • Create a Custom Design Using the LM2585 With the WEBENCH® Power Designer
  • Requires Few External Components
  • Family of Standard Inductors and Transformers
  • NPN Output Switches 3 A, Can Stand Off 65 V
  • Wide Input Voltage Range: 4 V to 40 V
  • Current-mode Operation for Improved Transient Response, Line Regulation, and Current Limit
  • 100-kHz Switching Frequency
  • Internal Soft-Start Function Reduces In-rush Current During Start-up
  • Output Transistor Protected by Current Limit, Undervoltage Lockout, and Thermal Shutdown
  • System Output Voltage Tolerance of ±4% Maximum Over Line and Load Conditions
  • Create a Custom Design Using the LM2585 With the WEBENCH® Power Designer

The LM2585 series of regulators are monolithic integrated circuits specifically designed for flyback, step-up (boost), and forward converter applications. The device is available in 4 different output voltage versions: 3.3 V, 5 V, 12 V, and adjustable.

Requiring a minimum number of external components, these regulators are cost effective and simple to use. Included in the datasheet are typical circuits of boost and flyback regulators. Also listed are selector guides for diodes and capacitors and a family of standard inductors and flyback transformers designed to work with these switching regulators.

The power switch is a 3-A NPN device that can stand off 65 V. Protecting the power switch are current and thermal limiting circuits, and an undervoltage lockout circuit. This IC contains a 100-kHz fixed-frequency internal oscillator that permits the use of small magnetics. Other features include soft start mode to reduce in-rush current during start-up, current mode control for improved rejection of input voltage and output load transients and cycle-by-cycle current limiting. An output voltage tolerance of ±4%, within specified input voltages and output load conditions, is specified for the power supply system.

The LM2585 series of regulators are monolithic integrated circuits specifically designed for flyback, step-up (boost), and forward converter applications. The device is available in 4 different output voltage versions: 3.3 V, 5 V, 12 V, and adjustable.

Requiring a minimum number of external components, these regulators are cost effective and simple to use. Included in the datasheet are typical circuits of boost and flyback regulators. Also listed are selector guides for diodes and capacitors and a family of standard inductors and flyback transformers designed to work with these switching regulators.

The power switch is a 3-A NPN device that can stand off 65 V. Protecting the power switch are current and thermal limiting circuits, and an undervoltage lockout circuit. This IC contains a 100-kHz fixed-frequency internal oscillator that permits the use of small magnetics. Other features include soft start mode to reduce in-rush current during start-up, current mode control for improved rejection of input voltage and output load transients and cycle-by-cycle current limiting. An output voltage tolerance of ±4%, within specified input voltages and output load conditions, is specified for the power supply system.
filter Find other AC/DC & DC/DC converters (integrated FET)
Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 22
Type Title Date
* Data sheet LM2585 4-V to 40-V, 3-A Step-Up Wide VIN Flyback Converter datasheet (Rev. G) PDF | HTML 29 May 2019
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mar 2024
Application note 스트컨버터의 전력계 기본 계산 (Rev. D) PDF | HTML 21 Nov 2022
Application note Basic Calculation of a Boost Converter's Power Stage (Rev. D) PDF | HTML 28 Oct 2022
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Inverted SEPIC Made SIMPLE 31 Jul 2015
Application note Softstart Using Constant Current Constant Voltage Approach 24 Jul 2015
Application note Working With Boost Converters 15 Jun 2015
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 Apr 2013
Application note AN-1082 Adjust or Synchronize LM2586/88 Switching Frequency (Rev. B) 23 Apr 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 23 Apr 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (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 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
White paper It's a Buck; It's a Boost, No! It's a Switcher! (part four) 01 Sep 2003
Application note Understanding Boost Power Stages In Switchmode Power Supplies 04 Mar 1999

Design & development

Please view the Design & development section on a desktop.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos