3V to 20V, 2.0A Step-Down DC/DC Switching Regulator in LLP-10


Product details


Vin (Min) (V) 3 Vin (Max) (V) 20 Vout (Min) (V) 1 Vout (Max) (V) 18 Iout (Max) (A) 2 Iq (Typ) (uA) 2400 Switching frequency (Min) (kHz) 1000 Switching frequency (Max) (kHz) 2300 Features Enable, Frequency Synchronization Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

WSON (DSC) 10 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)


  • Input Voltage Range of 3 V to 20 V
  • Output Voltage Range of 1 V to 18 V
  • LMR12015 and LMR12020 Deliver 1.5-A and 2-A Maximum Output Current, Respectively
  • 2-MHz Switching Frequency
  • Frequency Synchronization from 1 MHz to 2.35 MHz
  • 70-nA Shutdown Current
  • 1% Voltage-Reference Accuracy
  • Peak-Current-Mode PWM Operation
  • Thermal Shutdown
  • Internally Compensated
  • Internal Soft Start
  • Tight Accuracy for Powering Digital ICs
  • Extremely Easy to Use
  • Tiny Overall Solution Reduces System Cost
  • Space-Saving WSON (3 × 3 × 0.8 mm) Packaging
  • Create a custom design using the LMR12015 WEBENCH® Power Designer or LMR12020 WEBENCH® Power Designer
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The LMR120xx regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 10-pin WSON package. It contains all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area.

With a minimum of external components the LMR12015/20 is easy to use. The ability to drive 1.5-A or 2-A loads, with an internal 150-mΩ NMOS switch results in the best power density available. The control circuitry allows for on-times as low as 65 ns, thus supporting exceptionally high frequency conversion. Switching frequency is internally set to 2 MHz and synchronizable from 1 to 2.35 MHz, which allows the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is very high, efficiencies up to 90% are easy to achieve. External shutdown is included featuring an ultra-low shutdown current of 70 nA. The LMR12015/20 utilizes peak current mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.

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Technical documentation

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Type Title Date
* Data sheet LMR120xx 20-VIN, 1.5-A or 2-A Step-Down Voltage Regulator in WSON Package datasheet (Rev. B) Jun. 14, 2019
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
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
Technical article DC/DC converter datasheets – System efficiency demystified Apr. 18, 2016
User guide AN-2279 LMR12020 Evaluation Module (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-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

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Hardware development

document-generic User guide
The LMR12020 evaluation module is designed to provide the power supply design engineer with a fully functional regulator design which can be synchronized to an external clock between 1000 kHz and 2350 kHz. The evaluation module provides two output voltage options viz. 3.3V and 5V with a 2A current (...)
3.3V Output Voltage Option:
  • Input Range: 5 to 20V
  • Output Voltage: 3.3V
  • Output Current: 0 to 2A
  • Frequency of Operation: 1000 kHz - 2350 kHz
  • Default Frequency of Operation: 2000 kHz
  • Board Size: 1.944 X 1.35 inches (49.37 X 34.29 mm)
5V Output Voltage Option:
  • Input Range: 7 to 20V
  • Output Voltage: 5V
  • Output (...)

Design tools & simulation

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

Power Reference Design for Xilinx® Zynq®-7000
PMP7877 The PMP7877 reference design provides all the rails necessary to power a Xilinx® Zynq®-7000 series SoC.  It operates from an input voltage range of 10.8Vin to 13.2Vin and has seven regulated outputs: 1Vout @ 5A, 1.8Vout @ 2.5A, 1.5Vout @ 6A, 3.3Vout @ 5A, 3.3Vout @ 5A, 5Vout @ 2A, and (...)
document-generic Schematic

CAD/CAE symbols

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WSON (DSC) 10 View options

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