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LMR14203

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

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

LMR14203

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Data sheet Order now

Product details

Parameters

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) (uA) 1300 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 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

SOT-23-THN (DDC) 6 5 mm² 2.9 x 1.6 open-in-new Find other Buck converters (integrated switch)

Features

  • 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

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Description

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

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet SIMPLE SWITCHER 42Vin, 0.3A Step-Dwn V-Reg in SOT-23 datasheet (Rev. C) Apr. 04, 2013
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles Quantifying the value of wide VIN Jun. 15, 2016
Technical articles DC/DC converter datasheets – System losses demystified Apr. 25, 2016
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Technical articles DC/DC converter datasheets – System efficiency demystified Apr. 18, 2016
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep. 12, 2014
User guide AN-2185 LMR14203/LMR14206 Demonstation Board (Rev. B) 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-1197 Selecting Inductors for Buck Converters (Rev. B) 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

Design & development

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

Hardware development

EVALUATION BOARD Download
20
Description

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 (...)

Features
  • 4.5V to 42V Input Voltage Range
  • 1.2V Output Voltage
  • Up to 300 mA Output Current
  • Switching Frequency of 1.25 MHz
  • Internal Compensation
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Design tools & simulation

SIMULATION MODEL Download
SNVM219.ZIP (180 KB) - PSpice Model
SIMULATION MODEL Download
SNVM220.ZIP (53 KB) - PSpice Model
SIMULATION MODEL Download
SNVM942.ZIP (2 KB) - PSpice Model
SIMULATION MODEL Download
SNVM943.ZIP (1 KB) - PSpice Model
SIMULATION TOOL Download
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 (...)
Features
  • 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
  • (...)
View details
SCHEMATIC Download
SNVR077.PDF (28 KB)
SCHEMATIC Download
SNVR079.PDF (27 KB)
SCHEMATIC Download
SNVR081.PDF (30 KB)
SCHEMATIC Download
SNVR083.PDF (33 KB)
SCHEMATIC Download
SNVR085.PDF (35 KB)
SCHEMATIC Download
SNVR087.PDF (32 KB)
BILL OF MATERIALS (BOM) Download
SNVR065.ZIP (7 KB)
BILL OF MATERIALS (BOM) Download
SNVR067.ZIP (7 KB)
BILL OF MATERIALS (BOM) Download
SNVR069.ZIP (7 KB)
BILL OF MATERIALS (BOM) Download
SNVR071.ZIP (8 KB)
BILL OF MATERIALS (BOM) Download
SNVR073.ZIP (8 KB)
BILL OF MATERIALS (BOM) Download
SNVR075.ZIP (8 KB)

Reference designs

REFERENCE DESIGNS Download
Dual-Stage Triple-Output Buck Converter
PMP7800 — The PMP7800.1 reference design is a Buck which uses a LMR14203 and was intended for Computers and Peripherals applications. It can generate a Non-Isolated 3.3 volt output at 0.07 Amps from an input 21.6 to 26.4 Volts DC.
Design files
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CAD/CAE symbols

Package Pins Download
SOT-23-THIN (DDC) 6 View options

Ordering & quality

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  • Ongoing reliability monitoring

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