LMZ31503

ACTIVE

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

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Product details

Parameters

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 Switching frequency (Typ) (kHz) 500 Duty cycle (Max) (%) 100 Type Module Topology Buck, Synchronous Buck open-in-new Find other Buck modules (integrated inductor)

Package | Pins | Size

B1QFN (RUQ) 47 135 mm² 15 x 9 open-in-new Find other Buck modules (integrated inductor)

Features

  • 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

All trademarks are the property of their respective owners.

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Description

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.

open-in-new Find other Buck modules (integrated inductor)
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Technical documentation

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Type Title Date
* Datasheet LMZ31503 3-A Power Module With 4.5V-14.5V Input in QFN Package datasheet (Rev. B) Apr. 11, 2018
Application notes Soldering Requirements for BQFN Packages (Rev. C) Mar. 05, 2020
Selection guides Innovative DC/DC Power Modules Selection Guide (Rev. C) Feb. 27, 2018
Application notes Working With QFN Power Modules (Rev. A) Jun. 08, 2017
Selection guides TI Components for Aerospace and Defense Guide (Rev. E) Mar. 22, 2017
Selection guides SIMPLE SWITCHER Overview Brochure (Rev. B) Mar. 18, 2016
Technical articles Multiphase DC/DC converters provide low ripple, integrated solution for FPGA power designs Jul. 09, 2015
Application notes Adjusting LMZ3 Output Voltage with LM10010/1 Feb. 11, 2014
Application notes Powering LMZ3 SIMPLE SWITCHER Power Modules From 3.3 V Jul. 02, 2013
User guides Using the LMZ31506EVM, LMZ31503EVM, LMZ31506HEVM Jul. 02, 2013

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$49.00
Description
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 (...)
Features
  • 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 Slow-Start
  • Output Voltage Sequencing / Tracking
  • Power Good Output
  • Programmable Undervoltage Lockout (UVLO)
  • Output Overcurrent Protection
  • Over Temperature (...)

Design tools & simulation

SIMULATION MODELS Download
SNVMA30.ZIP (7 KB) - PSpice Model
SIMULATION MODELS Download
SNVMA31.ZIP (114 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
Xilinx® Zynq® 7000 series (XC7Z015) Power Solution, 8W - Reference Design
PMP10601 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Xilinx® Zynq®7000 series (XC7Z015) Power Solution, 5W - Reference Design
PMP10600 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 down (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
Arria V Power Reference Design
PMP8610 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 cross (...)

document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
Altera Cyclone V SoC Power Supply Reference Design
PMP9353 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.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
Xilinx Zynq 7000 Series 5W Small Efficient Low-Noise Power Solution Reference Design
TIDA-00574 The TIDA-00574 shows small solution size and high curren density & low noise power solution.  It supports internal sequencing and high output voltage accuracy.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Xilinx Kintex UltraScale FPGA Power Solution Reference Design with PMBus
PMP9444 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
B1QFN (RUQ) 47 View options

Ordering & quality

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Videos

Choosing Between a DC/DC Power Module and a Discrete Switching Regulator

When should I select a power module instead of a converter as my step-down DC/DC power supply? Learn the pros and cons of each approach in this brief video.

Posted: 29-Jan-2016
Duration: 06:26

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