LMR62421

ACTIVE

SIMPLE SWITCHER 2.7V to 5.5V, 24Vout, 2.1A Boost Converter in SOT-23

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Boost Type Converter Vin (min) (V) 2.7 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 1600 Switching frequency (max) (kHz) 1600 Features Enable, Nonsynchronous rectification Vout (min) (V) 3 Vout (max) (V) 24 Iq (typ) (µA) 7000 Duty cycle (max) (%) 96 Switch current limit (typ) (A) 3
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Boost Type Converter Vin (min) (V) 2.7 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 1600 Switching frequency (max) (kHz) 1600 Features Enable, Nonsynchronous rectification Vout (min) (V) 3 Vout (max) (V) 24 Iq (typ) (µA) 7000 Duty cycle (max) (%) 96 Switch current limit (typ) (A) 3
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8 WSON (NGG) 6 9 mm² 3 x 3
  • Input Voltage Range of 2.7V to 5.5V
  • Output Voltage up to 24V
  • Switch Current up to 2.1A
  • 1.6 MHz Switching Frequency
  • Low Shutdown Iq, 80 nA
  • Cycle-by-Cycle Current Limiting
  • Internally Compensated
  • Internal Soft-Start
  • 5-Pin SOT-23 (2.92 x 2.84 x 1mm) and 6-Pin WSON (3 x 3 x 0.8 mm) Packaging
  • Fully Enabled for WEBENCH® Power Designer

Performance Benefits

  • Extremely Easy to Use
  • Tiny Overall Solution Reduces System Cost

All trademarks are the property of their respective owners.

  • Input Voltage Range of 2.7V to 5.5V
  • Output Voltage up to 24V
  • Switch Current up to 2.1A
  • 1.6 MHz Switching Frequency
  • Low Shutdown Iq, 80 nA
  • Cycle-by-Cycle Current Limiting
  • Internally Compensated
  • Internal Soft-Start
  • 5-Pin SOT-23 (2.92 x 2.84 x 1mm) and 6-Pin WSON (3 x 3 x 0.8 mm) Packaging
  • Fully Enabled for WEBENCH® Power Designer

Performance Benefits

  • Extremely Easy to Use
  • Tiny Overall Solution Reduces System Cost

All trademarks are the property of their respective owners.

The LMR62421 is an easy-to-use, space-efficient 2.1A low-side switch regulator ideal for Boost and SEPIC DC-DC regulation. It provides all the active functions to provide local DC/DC conversion with fast-transient response and accurate regulation in the smallest PCB area. Switching frequency is internally set to 1.6 MHz, allowing the use of extremely small surface mount inductor and chip capacitors while providing efficiencies near 90%. Current-mode control and internal compensation provide ease-of-use, minimal component count, and high-performance regulation over a wide range of operating conditions. External shutdown features an ultra-low standby current of 80 nA ideal for portable applications. Tiny 5-pin SOT-23 and 6-pin WSON packages provide space-savings. Additional features include internal soft-start, circuitry to reduce inrush current, pulse-by-pulse current limit, and thermal shutdown.

The LMR62421 is an easy-to-use, space-efficient 2.1A low-side switch regulator ideal for Boost and SEPIC DC-DC regulation. It provides all the active functions to provide local DC/DC conversion with fast-transient response and accurate regulation in the smallest PCB area. Switching frequency is internally set to 1.6 MHz, allowing the use of extremely small surface mount inductor and chip capacitors while providing efficiencies near 90%. Current-mode control and internal compensation provide ease-of-use, minimal component count, and high-performance regulation over a wide range of operating conditions. External shutdown features an ultra-low standby current of 80 nA ideal for portable applications. Tiny 5-pin SOT-23 and 6-pin WSON packages provide space-savings. Additional features include internal soft-start, circuitry to reduce inrush current, pulse-by-pulse current limit, and thermal shutdown.

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Technical documentation

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Type Title Date
* Data sheet LMR62421 SIMPLE SWITCHER ® 24Vout, 2.1A Step-Up Voltage Regulator in SOT-23 datasheet (Rev. B) 04 Apr 2013
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
Technical article DC/DC converter datasheets- current limit - part two PDF | HTML 05 Sep 2016
Technical article DC/DC converter datasheets: current limit - part one PDF | HTML 29 Aug 2016
Technical article Quantifying the value of wide VIN PDF | HTML 15 Jun 2016
Technical article DC/DC converter datasheets – System losses demystified PDF | HTML 25 Apr 2016
Technical article DC/DC converter datasheets – System efficiency demystified PDF | HTML 18 Apr 2016
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
EVM User's guide AN-2197 LMR62421 Demo Board (Rev. A) 26 Apr 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 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-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 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
Application note Understanding Boost Power Stages In Switchmode Power Supplies 04 Mar 1999

Design & development

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

Evaluation board

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LAUNCHXL-F280049C is a low-cost development board for TI C2000™ Real-Time Controllers series of F28004x devices. Ideal for initial evaluation and prototyping, it provides a standardized and easy to use platform to develop your next application. This extended version LaunchPad offers extra (...)
User guide: PDF | HTML
Not available on TI.com
Evaluation board

LMR62421XSDDEMO — LMR62421 SIMPLE SWITCHER® 24Vout, 2.1A Small Step-Up Regulator Demo Board

The LMR62421 is a high frequency switching boost regulator which offers small size and high power conversion efficiency. The part operates at a 1.6MHz switching frequency. It provides all the active functions to provide local DC/DC conversion with fast-transient response and accurate regulation in (...)

User guide: PDF
Not available on TI.com
Development kit

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Simulation model

LMR62421 TINA-TI Transient Reference Design

SNVM625.ZIP (185 KB) - TINA-TI Reference Design
Simulation model

LMR62421 TINA-TI Transient Spice Model

SNVM624.ZIP (14 KB) - TINA-TI Spice Model
Simulation model

LMR62421X PSpice Average Model

SNVM194.ZIP (48 KB) - PSpice Model
Simulation model

LMR62421X TINA-TI Average Reference Design

SNVM456.TSC (54 KB) - TINA-TI Reference Design
Simulation model

LMR62421X Unencrypted PSpice Average Model

SNVM949.ZIP (1 KB) - PSpice Model
Simulation model

LMR62421X Unencrypted PSpice Transient Model

SNVM950.ZIP (2 KB) - PSpice Model
Simulation model

Unencrypted LMR62421X PSpice Transient Model (Rev. A)

SNVM195A.ZIP (170 KB) - PSpice Model
Reference designs

TIDA-00609 — Self-Booting Audio System

The purpose of this reference design is to provide hardware and software tools that can be used as reference for audio systems. The new revision of the PurePath™ Console Motherboard (Rev F) adds stand-alone self-booting capabilities to allow making compelling demos with any evaluation module (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOT-23 (DBV) 5 Ultra Librarian
WSON (NGG) 6 Ultra Librarian

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