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Buck converters (integrated switch)

LMR14203

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4.5V to 42V, 0.3A Step-Down DC/DC Switching Regulator in SOT-23

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Data sheet

A newer version of this product is available

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LMR14203

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 4.5 Vin (max) (V) 42 Vout (min) (V) 0.765 Vout (max) (V) 34 Iout (max) (A) 0.3 Iq (typ) (mA) 1.3 Switching frequency (min) (kHz) 950 Switching frequency (max) (kHz) 1500 Features Enable, Over Current Protection Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 87 Type Converter
Vin (min) (V) 4.5 Vin (max) (V) 42 Vout (min) (V) 0.765 Vout (max) (V) 34 Iout (max) (A) 0.3 Iq (typ) (mA) 1.3 Switching frequency (min) (kHz) 950 Switching frequency (max) (kHz) 1500 Features Enable, Over Current Protection Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 87 Type Converter
SOT-23-THN (DDC) 6 8.12 mm² 2.9 x 2.8
  • Input Voltage Range of 4.5V to 42V
  • Output Voltage Range of 0.765V to 34V
  • Output Current up to 0.3A
  • 1.25 MHz Switching Frequency
  • Low Shutdown Iq, 16 µA Typical
  • Short Circuit Protected
  • Internally Compensated
  • Soft-Start Function
  • Thin SOT-23-6 Package (2.97 x 1.65 x 1mm)
  • Fully Enabled for WEBENCH® Power Designer

Performance Benefits

  • Tight Accuracy for Powering Digital ICs
  • Extremely Easy to Use
  • Tiny Overall Solution Reduces System Cost

All trademarks are the property of their respective owners.

  • Input Voltage Range of 4.5V to 42V
  • Output Voltage Range of 0.765V to 34V
  • Output Current up to 0.3A
  • 1.25 MHz Switching Frequency
  • Low Shutdown Iq, 16 µA Typical
  • Short Circuit Protected
  • Internally Compensated
  • Soft-Start Function
  • Thin SOT-23-6 Package (2.97 x 1.65 x 1mm)
  • Fully Enabled for WEBENCH® Power Designer

Performance Benefits

  • Tight Accuracy for Powering Digital ICs
  • Extremely Easy to Use
  • Tiny Overall Solution Reduces System Cost

All trademarks are the property of their respective owners.

The LMR14203 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is suitable for a wide range of applications such as power conditioning from unregulated sources. They feature a low RDSON (0.9Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 1.25 MHz allowing the use of small external components while still being able to have low output voltage ripple. Soft-start can be implemented using the shutdown pin with an external RC circuit allowing the user to tailor the soft-start time to a specific application.

The LMR14203 is optimized for up to 300 mA load current.

Additional features include: thermal shutdown, VIN under-voltage lockout, and gate drive under-voltage lockout. The LMR14203 is available in a low profile SOT-6L package.

The LMR14203 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is suitable for a wide range of applications such as power conditioning from unregulated sources. They feature a low RDSON (0.9Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 1.25 MHz allowing the use of small external components while still being able to have low output voltage ripple. Soft-start can be implemented using the shutdown pin with an external RC circuit allowing the user to tailor the soft-start time to a specific application.

The LMR14203 is optimized for up to 300 mA load current.

Additional features include: thermal shutdown, VIN under-voltage lockout, and gate drive under-voltage lockout. The LMR14203 is available in a low profile SOT-6L package.
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Technical documentation

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Type Title Date
* Data sheet SIMPLE SWITCHER 42Vin, 0.3A Step-Dwn V-Reg in SOT-23 datasheet (Rev. C) 04 Apr 2013
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Quantifying the value of wide VIN 15 Jun 2016
Technical article DC/DC converter datasheets – System losses demystified 25 Apr 2016
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) PDF | HTML 19 Apr 2016
Technical article DC/DC converter datasheets – System efficiency demystified 18 Apr 2016
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 12 Sep 2014
User guide AN-2185 LMR14203/LMR14206 Demonstation Board (Rev. B) 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-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 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

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

Evaluation board

LMR14203XMKDEMO — LMR14203 Simple Switcher® Small Footprint 42V Buck Regulator 300 mA Demo Board

The LMR14203/06 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is suitable for a variety of applications from automotive to power conditioning of unregulated sources. The LMR14203/LMR14006 Evaluation Board is designed to provide the design engineer with a fully (...)

User guide: PDF
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Simulation model

LMR14203X PSpice Average Model

SNVM220.ZIP (53 KB) - PSpice Model
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Simulation model

LMR14203X PSpice Transient Model

SNVM219.ZIP (180 KB) - PSpice Model
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Simulation model

LMR14203X Unencrypted PSpice Average Model

SNVM943.ZIP (1 KB) - PSpice Model
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Simulation model

LMR14203X Unencrypted PSpice Transient Model

SNVM942.ZIP (2 KB) - PSpice Model
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Bill of materials (BOM)

SIMPLE SWITCHER Power Design for TMS320F281x/C281x with 24V Input (BOM)

SNVR065.ZIP (7 KB)
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Bill of materials (BOM)

SIMPLE SWITCHER Power Design for TMS320F280x/C280x/F2801x with 24V Input (BOM)

SNVR067.ZIP (7 KB)
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Bill of materials (BOM)

SIMPLE SWITCHER Power Design for TMS320C6743 with 24V Input (BOM)

SNVR069.ZIP (7 KB)
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Bill of materials (BOM)

SIMPLE SWITCHER Power Design for TMS320C6742/C6746/C6748 with 24V Input (BOM)

SNVR071.ZIP (8 KB)
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Bill of materials (BOM)

SIMPLE SWITCHER Power Design for AM3715 and AM3703 with 24V Input (BOM)

SNVR073.ZIP (8 KB)
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Bill of materials (BOM)

SIMPLE SWITCHER Power Design for AM17x with 24V Input (BOM)

SNVR075.ZIP (8 KB)
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Schematic

SIMPLE SWITCHER Power Design for TMS320F281x/C281x with 24V Input (Schematic)

SNVR077.PDF (28 KB)
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Schematic

SIMPLE SWITCHER Power Design for TMS320F280x/C280x/F2801x w/ 24V Input (Schem)

SNVR079.PDF (27 KB)
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Schematic

SIMPLE SWITCHER Power Design for TMS320C6743 with 24V Input (Schematic)

SNVR081.PDF (30 KB)
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Schematic

SIMPLE SWITCHER Power Design for TMS320C6742/C6746/C6748 with 24V Input (Schem)

SNVR083.PDF (33 KB)
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Schematic

SIMPLE SWITCHER Power Design for AM3715 and AM3703 with 24V Input (Schematic)

SNVR085.PDF (35 KB)
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Schematic

SIMPLE SWITCHER Power Design for AM17x with 24V Input (Schematic)

SNVR087.PDF (32 KB)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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Reference designs

PMP22339 — High voltage 800-W SEPIC converter reference design for server battery backup charging

This discontinuous conduction mode (DCM) non-isolated 800-W SEPIC converter battery charger reference design provides an adjustable output voltage and current. The output voltage can be adjusted from 282 V to 400 V by setting an external DC voltage between 0 V to 3 V. The output charging current (...)
User guide: PDF
Schematic: PDF
Package Pins Download
SOT-23-THN (DDC) 6 View options
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