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LMZ31503

ACTIVE

4.5V to 15V, 3A Step-Down Power Module in 9x15x2.8mm QFN Package

Product details

Iout (max) (A) 3 Vin (min) (V) 4.5 Vin (max) (V) 14.5 Vout (min) (V) 0.8 Vout (max) (V) 5.5 Soft start Adjustable Features EMI Tested, Enable, Frequency synchronization, Power good, Remote Sense, Tracking Operating temperature range (°C) -40 to 85 Iq (typ) (mA) 13.4 Regulated outputs (#) 1 Switching frequency (max) (kHz) 780 Switching frequency (min) (kHz) 330 Duty cycle (max) (%) 100 Topology Buck, Synchronous Buck Type Module Rating Catalog Control mode current mode
Iout (max) (A) 3 Vin (min) (V) 4.5 Vin (max) (V) 14.5 Vout (min) (V) 0.8 Vout (max) (V) 5.5 Soft start Adjustable Features EMI Tested, Enable, Frequency synchronization, Power good, Remote Sense, Tracking Operating temperature range (°C) -40 to 85 Iq (typ) (mA) 13.4 Regulated outputs (#) 1 Switching frequency (max) (kHz) 780 Switching frequency (min) (kHz) 330 Duty cycle (max) (%) 100 Topology Buck, Synchronous Buck Type Module Rating Catalog Control mode current mode
B1QFN (RUQ) 47 135 mm² 15 x 9
  • Complete Integrated Power Solution Allows
    Small Footprint, Low-Profile Design
  • 9 mm × 15mm × 2.8mm package
    - Pin Compatible with LMZ31506
  • Efficiencies Up To 95%
  • Wide-Output Voltage Adjust
    0.8 V to 5.5 V, with 1% Reference Accuracy
  • Optional Split Power Rail Allows
    Input Voltage Down to 1.6 V
  • Adjustable Switching Frequency
    (330 kHz to 780 kHz)
  • Synchronizes to an External Clock
  • Adjustable Slow-Start
  • Output Voltage Sequencing / Tracking
  • Power Good Output
  • Programmable Undervoltage Lockout (UVLO)
  • Overcurrent Protection (Hiccup-Mode)
  • Over Temperature Protection
  • Pre-bias Output Start-up
  • Operating Temperature Range: –40°C to +85°C
  • Enhanced Thermal Performance: 13°C/W
  • Meets EN55022 Class B Emissions
    - Integrated Shielded Inductor
  • Create a Custom Design Using the LMZ31503 With the WEBENCH® Power Designer
  • Complete Integrated Power Solution Allows
    Small Footprint, Low-Profile Design
  • 9 mm × 15mm × 2.8mm package
    - Pin Compatible with LMZ31506
  • Efficiencies Up To 95%
  • Wide-Output Voltage Adjust
    0.8 V to 5.5 V, with 1% Reference Accuracy
  • Optional Split Power Rail Allows
    Input Voltage Down to 1.6 V
  • Adjustable Switching Frequency
    (330 kHz to 780 kHz)
  • Synchronizes to an External Clock
  • Adjustable Slow-Start
  • Output Voltage Sequencing / Tracking
  • Power Good Output
  • Programmable Undervoltage Lockout (UVLO)
  • Overcurrent Protection (Hiccup-Mode)
  • Over Temperature Protection
  • Pre-bias Output Start-up
  • Operating Temperature Range: –40°C to +85°C
  • Enhanced Thermal Performance: 13°C/W
  • Meets EN55022 Class B Emissions
    - Integrated Shielded Inductor
  • Create a Custom Design Using the LMZ31503 With the WEBENCH® Power Designer

The LMZ31503 power module is an easy-to-use integrated power solution that combines a 3-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 3 external components and eliminates the loop compensation and magnetics design process.

The 9×15×2.8 mm QFN package is easy to solder onto a printed circuit board and allows a compact point-of-load design with up to 95% efficiency and excellent power dissipation with a thermal impedance of 13°C/W junction to ambient. The device delivers the full 3-A rated output current at 85°C ambient temperature without airflow.

The LMZ31503 offers the flexibility and the feature-set of a discrete point-of-load design and is ideal for powering performance DSPs and FPGAs. Advanced packaging technology afford a robust and reliable power solution compatible with standard QFN mounting and testing techniques.

The LMZ31503 power module is an easy-to-use integrated power solution that combines a 3-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 3 external components and eliminates the loop compensation and magnetics design process.

The 9×15×2.8 mm QFN package is easy to solder onto a printed circuit board and allows a compact point-of-load design with up to 95% efficiency and excellent power dissipation with a thermal impedance of 13°C/W junction to ambient. The device delivers the full 3-A rated output current at 85°C ambient temperature without airflow.

The LMZ31503 offers the flexibility and the feature-set of a discrete point-of-load design and is ideal for powering performance DSPs and FPGAs. Advanced packaging technology afford a robust and reliable power solution compatible with standard QFN mounting and testing techniques.

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Technical documentation

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Type Title Date
* Data sheet LMZ31503 3-A Power Module With 4.5V-14.5V Input in QFN Package datasheet (Rev. B) 11 Apr 2018
Selection guide Innovative DC/DC Power Modules Selection Guide (Rev. D) 14 Oct 2021
Application note Soldering Requirements for BQFN Packages (Rev. C) 05 Mar 2020
Application note Working With QFN Power Modules (Rev. A) 08 Jun 2017
Technical article Multiphase DC/DC converters provide low ripple, integrated solution for FPGA power PDF | HTML 09 Jul 2015
Application note Adjusting LMZ3 Output Voltage with LM10010/1 11 Feb 2014
Application note Powering LMZ3 SIMPLE SWITCHER Power Modules From 3.3 V 02 Jul 2013
EVM User's guide Using the LMZ31506EVM, LMZ31503EVM, LMZ31506HEVM 02 Jul 2013

Design & development

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

Evaluation board

LMZ31503EVM-692 — LMZ31503 4.5V to 14.5V, 3A Step-Down Power Module Evaluation Board

The Texas Instruments LMZ31503EVM-692 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMZ31503 3A power module. The output voltage can be selected from six preset values using a jumper (5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V). Solder pads and jumpers are available to (...)
User guide: PDF
Not available on TI.com
Simulation model

LMZ31503 PSpice Transient Model

SNVMA31.ZIP (114 KB) - PSpice Model
Simulation model

LMZ31503 Unencrypted PSpice Transient Model

SNVMA30.ZIP (7 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

TIDA-00574 — Xilinx Zynq 7000 Series 5W Small Efficient Low-Noise Power Solution Reference Design

The TIDA-00574 shows small solution size and high curren density & low noise power solution.  It supports internal sequencing and high output voltage accuracy.
Design guide: PDF
Schematic: PDF
Reference designs

PMP10600 — Xilinx® Zynq®7000 series (XC7Z015) Power Solution, 5W - Reference Design

The PMP10600.1 reference design provides all the power supply rails necessary to power Xilinx® Zynq® 7000 series (XC7Z015) FPGA.   This design uses several LMZ3 series modules, LDOs, and a DDR termination regulator.  It also features one LM3880 for power up and power (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP10601 — Xilinx® Zynq® 7000 series (XC7Z015) Power Solution, 8W - Reference Design

The PMP10601 reference design provides all the power supply rails necessary to power Xilinx® Zynq® 7000 series (XC7Z015)  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 also (...)
Test report: PDF
Schematic: PDF
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 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP8610 — Arria V Power Reference Design

Power Solution Reference Design for Arria V FPGA from Altera.  This solution uses integrated inductor modules for ease of use to help design power solution for Arria V FPGA from Altera.  This design incorporate sequencing need for the PFGA as well.

Special Note

Go to the TPS84 to LMZ3 part number (...)

Test report: PDF
Schematic: PDF
Reference designs

PMP9353 — Altera Cyclone V SoC Power Supply Reference Design

The PMP9353 reference design is a complete power solution for Altera Cyclone V SoC devices. This design uses several LMZ3 series modules , two LDOs, and a DDR termination regulator to provide all the necessary rails to power the SoC chip. This design also shows correct power-up sequencing.
Test report: PDF
Schematic: PDF
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 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP9444 — Xilinx Kintex UltraScale FPGA Power Solution Reference Design with PMBus

The PMP9444 reference design provides all the power supply rails necessary to power Xilinx's Kintex UltraScale family of FPGAs.  It features two UCD90120A's for flexible power up and power down sequencing as well as voltage monitoring, current monitoring, and voltage margining through the (...)
Test report: PDF
Schematic: PDF
Package Pins Download
B1QFN (RUQ) 47 View options

Ordering & quality

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  • Ongoing reliability monitoring
Information included:
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  • Assembly location

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