3V to 14.5V, 20A Step-Down Power Module in 15x16x5.8mm QFN Package


Product details


Iout (Max) (A) 20 Vin (Min) (V) 3 Vin (Max) (V) 14.5 Vout (Min) (V) 0.6 Vout (Max) (V) 3.6 Soft start Adjustable Features EMI Tested, Enable, Light Load Efficiency, Power Good, Remote Sense Operating temperature range (C) -40 to 85 Iq (Typ) (mA) 39 Regulated outputs (#) 1 Switching frequency (Max) (kHz) 850 Switching frequency (Min) (kHz) 300 Switching frequency (Typ) (kHz) 500 Duty cycle (Max) (%) 80 Topology Buck, Synchronous Buck open-in-new Find other Buck modules (integrated inductor)

Package | Pins | Size

B4QFN (RLG) 72 240 mm² 16 x 15 open-in-new Find other Buck modules (integrated inductor)


  • Complete Integrated Power Solution;
    Smaller than a Discrete Design
  • 15 mm × 16 mm × 5.8 mm Package Size
    - Pin Compatible with LMZ31530
  • Ultra-Fast Load Step Response
  • Efficiencies Up To 96%
  • Wide-Output Voltage Adjust
    0.6 V to 3.6 V, with 1% Reference Accuracy
  • Optional Split Power Rails Allows
    Input Voltage Down to 3 V
  • Selectable Switching Frequency
    (300 kHz to 850 kHz)
  • Selectable Slow-Start
  • Adjustable Overcurrent Limit
  • Power Good Output
  • Output Voltage Sequencing
  • Over Temperature Protection
  • Pre-bias Output Start-up
  • Operating Temperature Range: –40°C to 85°C
  • Enhanced Thermal Performance: 8.6°C/W
  • Meets EN55022 Class A Emissions
    - Integrated Shielded Inductor
  • Create a Custom Design Using the LMZ31520 With the WEBENCH® Power Designer

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The LMZ31520 power module is an easy-to-use integrated power solution that combines a 20-A DC/DC converter with power MOSFETs, a shielded inductor, and passives into a low profile, QFN package. This total power solution allows as few as three external components and eliminates the loop compensation and magnetics part selection process.

The 15×16×5.8 mm QFN package is easy to solder onto a printed circuit board and allows a compact point-of-load design. Achieves greater than 95% efficiency, has ultra-fast load step response and excellent power dissipation capability with a thermal impedance of 8.6°C/W. The LMZ31520 offers the flexibility and the feature-set of a discrete point-of-load design and is ideal for powering a wide range of ICs and systems. Advanced packaging technology affords a robust and reliable power solution compatible with standard QFN mounting and testing techniques.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LMZ31520 20-A Power Module With 3-V to 14.5-V Input in QFN Package datasheet (Rev. E) Sep. 04, 2018
Application notes Soldering Requirements for BQFN Packages (Rev. C) Mar. 05, 2020
Application notes Soldering Considerations for Power Modules Nov. 26, 2018
Selection guides Innovative DC/DC Power Modules Selection Guide (Rev. C) Feb. 27, 2018
White papers Simplify low EMI design with power modules Nov. 20, 2017
Technical articles FPGA power made simple: rail requirements Nov. 06, 2017
Application notes Working With QFN Power Modules (Rev. A) Jun. 08, 2017
User guides Using LMZ31520EVM-001, LMZ31530EVM-002 Evaluation Module (Rev. A) Jan. 13, 2014
Application notes Powering LMZ3 SIMPLE SWITCHER Power Modules From 3.3 V Jul. 02, 2013

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

The LMZ31520 evaluation board is configured to evaluate the operation of the LMZ31520 power module for current up to 20A. The input voltage range is 3V to 14.5V. The output voltage range is 0.6V to 3.6V. The evaluation board makes it easy to evaluate the LMZ1520 operation.

  • Monitor full operation of the LMZ31520 up to 20A.
  • Jumper selectable Vout
  • Jumper selectable switching frequency
  • Split rail input voltage capable
  • INH & PWRGD test points

Design tools & simulation

SLVMA59.ZIP (96 KB) - PSpice Model
SLVMAS0.ZIP (8 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

Xilinx Zynq 7000 Series (XC7Z045) 20W Reference Design
PMP10613 The PMP10613 reference design provides all the power supply rails necessary to power Xilinx® Zynq® 7000 series (XC7Z045)  FPGA.   This design uses several LMZ3 series modules, LDOs, and a DDR termination regulator to provide all the necessary rails to power the FPGA.  It (...)
document-generic Schematic document-generic User guide
Altera® Stratix® V FPGA Power Solution
PMP9365 The PMP9365 reference design provides all the power supply rails necessary to power Altera's Stratix V family of FPGAs.  This design uses several LMZ3 series modules, LDOs, and a DDR termination regulator to provide all the necessary rails to power the FPGA.  It also features two (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
BQFN (RLG) 72 View options

Ordering & quality

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