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) (uA) 39000 Regulated outputs (#) 1 Switching frequency (Max) (kHz) 850 Switching frequency (Min) (kHz) 300 Duty cycle (Max) (%) 80 Topology Buck, Synchronous Buck
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) (uA) 39000 Regulated outputs (#) 1 Switching frequency (Max) (kHz) 850 Switching frequency (Min) (kHz) 300 Duty cycle (Max) (%) 80 Topology Buck, Synchronous Buck
B4QFN (RLG) 72 240 mm² 15 x 16
  • 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
  • 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

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.

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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LMZ31530 ACTIVE 3V to 14.5V, 30A Step-Down Power Module in 15x16x5.8mm QFN Package LMZ31530 is rated at 30 A while LMZ31520 is rated at 20 A.

Technical documentation

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Type Title Date
* Data sheet LMZ31520 20-A Power Module With 3-V to 14.5-V Input in QFN Package datasheet (Rev. E) 04 Sep 2018
Selection guide Innovative DC/DC Power Modules Selection Guide (Rev. D) 14 Oct 2021
Application note Soldering Considerations for Power Modules (Rev. B) 17 May 2021
Application note Soldering Requirements for BQFN Packages (Rev. C) 05 Mar 2020
White paper Simplify low EMI design with power modules 20 Nov 2017
Technical article FPGA power made simple: rail requirements 06 Nov 2017
Application note Working With QFN Power Modules (Rev. A) 08 Jun 2017
User guide Using LMZ31520EVM-001, LMZ31530EVM-002 Evaluation Module (Rev. A) 13 Jan 2014
Application note Powering LMZ3 SIMPLE SWITCHER Power Modules From 3.3 V 02 Jul 2013

Design & development

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

Evaluation board

LMZ31520EVM-001 — LMZ31520 3V to 14.5V, 20A Step-Down Power Module Evaluation Board

The LMZ31520 EVM is designed to help the user easily evaluate and test the operation and functionality of the LMZ31520 buck module. The EVM convert a 3-V to 14.5-V input voltage to a regulated 0.6-V to 3.6-V output voltage that delivers up to 20 A in a 16-mm x 15-mm QFN package. The output (...)

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Simulation model

LMZ31520 PSpice Transient Model

SLVMA59.ZIP (96 KB) - PSpice Model
Simulation model

LMZ31520 Unencrypted PSpice Transient Model

SLVMAS0.ZIP (8 KB) - PSpice Model
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 (...)
Reference designs

PMP10613 — Xilinx Zynq 7000 Series (XC7Z045) 20W Reference Design

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 (...)
Reference designs

PMP9365 — Altera® Stratix® V FPGA Power Solution

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 (...)
Package Pins Download
BQFN (RLG) 72 View options

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