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


Product details


Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Vout (Min) (V) 3 Vout (Max) (V) 24 Switch current limit (Typ) (A) 3 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 1600 Switching frequency (Max) (kHz) 1600 Iq (Typ) (mA) 7 Features Enable Duty cycle (Max) (%) 96 Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Boost converters (integrated switch)

Package | Pins | Size

SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 WSON (NGG) 6 9 mm² 3 x 3 open-in-new Find other Boost converters (integrated switch)


  • 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.

open-in-new Find other Boost converters (integrated switch)


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.

open-in-new Find other Boost converters (integrated switch)

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 24
Type Title Date
* Data sheet LMR62421 SIMPLE SWITCHER ® 24Vout, 2.1A Step-Up Voltage Regulator in SOT-23 datasheet (Rev. B) Apr. 04, 2013
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical article DC/DC converter datasheets- current limit - part two Sep. 05, 2016
Technical article DC/DC converter datasheets: current limit - part one Aug. 29, 2016
Technical article Quantifying the value of wide VIN Jun. 15, 2016
Technical article DC/DC converter datasheets – System losses demystified Apr. 25, 2016
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Application note Inverted SEPIC Made SIMPLE Jul. 31, 2015
Application note Softstart Using Constant Current Constant Voltage Approach Jul. 24, 2015
Application note Working With Boost Converters Jun. 15, 2015
Application note Basic Calculation of a Boost Converter's Power Stage (Rev. C) Jan. 08, 2014
User guide AN-2197 LMR62421 Demo Board (Rev. A) Apr. 26, 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr. 23, 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 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 AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 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-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
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 03, 2004
Application note Understanding Boost Power Stages In Switchmode Power Supplies Mar. 04, 1999

Design & development

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

Hardware development

document-generic User guide
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 pins (...)

Hardware Features

  • TMS320F280049C: 100 MHz C28x CPU with FPU and TMU, 256 KB Flash, InstaSPIN-FOC enabled, 3x 12-bit ADC, CAN, encoder, FSI, UART, and more
  • On-board XDS110 debug probe for real-time debug and flash programming
  • 80 pin LaunchPad leveraging the BoosterPack ecosystem
  • Power domain isolation (...)
document-generic User guide

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 (...)

document-generic User guide

LAUNCHXL-F28379D is a low-cost evaluation and development tool for the TMS320F2837xDTMS320F2837xS, and TMS320F2807x products in the TI MCU LaunchPad™ development kit ecosystem which is compatible with various plug-on BoosterPacks (suggested under the recommended BoosterPack™ Plug-in (...)


Hardware features

  • USB connected isolated XDS100v2 JTAG debug probe for real-time debug and flash programming
  • 4x 20-pin headers/connectors
  • Programmable buttons and LEDs
  • TMS320F28379D: 200 MHz dual C28xCPUs and dual CLAs, 1 MB Flash, 16-bit or 12-bit ADCs, comparators, 12-bit DACs, delta-sigma sinc (...)

Design tools & simulation

SNVM194.ZIP (48 KB) - PSpice Model
SNVM195A.ZIP (170 KB) - PSpice Model
SNVM456.TSC (54 KB) - TINA-TI Reference Design
SNVM624.ZIP (14 KB) - TINA-TI Spice Model
SNVM625.ZIP (185 KB) - TINA-TI Reference Design
SNVM949.ZIP (1 KB) - PSpice Model
SNVM950.ZIP (2 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

Non-Synchronous Boost with Triple Outputs (3.3V@.03A)
PMP7833 — This is a non-synchronous boost converter with an input voltage range of 4.5V-to-5.5Vin and three regulated outputs: 12Vout @ 0.15A, 10.6Vout @ 0.1A, and 3.3Vout @ 0.03A
Self-Booting Audio System
TIDA-00609 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SOT-23 (DBV) 5 View options
WSON (NGG) 6 View options

Ordering & quality

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

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

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. ​​​​​​​​​​​​​​