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Buck modules (integrated inductor)

LMZ31704

ACTIVE

2.95V to 17V, 4A Step-Down Power Module with Current Sharing in 10x10x4.3mm QFN Package

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Data sheet

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TPSM84424 ACTIVE 4.5V to 17V Input, 0.6V-10V Output, 4A Power Module in Compact 7.5x7.5mm Footprint Smaller package size module that features TurboTrans™ technology.

LMZ31704

ACTIVE
Data sheet Order now

Product details

Iout (max) (A) 4 Vin (min) (V) 2.95 Vin (max) (V) 17 Vout (min) (V) 0.6 Vout (max) (V) 5.5 Soft start Adjustable Features Current Sharing, EMI Tested, Frequency synchronization, Light Load Efficiency, Power good, Remote Sense, Tracking Operating temperature range (°C) -40 to 85 Iq (typ) (mA) 0.8 Regulated outputs (#) 1 Switching frequency (max) (kHz) 1200 Switching frequency (min) (kHz) 200 Duty cycle (max) (%) 100 Topology Buck, Synchronous Buck Type Module Rating Catalog Control mode current mode
Iout (max) (A) 4 Vin (min) (V) 2.95 Vin (max) (V) 17 Vout (min) (V) 0.6 Vout (max) (V) 5.5 Soft start Adjustable Features Current Sharing, EMI Tested, Frequency synchronization, Light Load Efficiency, Power good, Remote Sense, Tracking Operating temperature range (°C) -40 to 85 Iq (typ) (mA) 0.8 Regulated outputs (#) 1 Switching frequency (max) (kHz) 1200 Switching frequency (min) (kHz) 200 Duty cycle (max) (%) 100 Topology Buck, Synchronous Buck Type Module Rating Catalog Control mode current mode
B3QFN (RVQ) 42 1E+2 mm² 1E+1 x 1E+1
  • Complete integrated power solution allows
    small footprint, low-profile design
  • 10-mm × 10-mm × 4.3-mm package
    • Pin compatible with LMZ31710 and LMZ31707
  • Efficiencies up to 95%
  • Eco-mode™ / light load efficiency (LLE)
  • Wide-output voltage adjust
    0.6 V to 5.5 V, with 1% reference accuracy
  • Supports parallel operation for higher current
  • Optional split power rail allows
    input voltages down to 2.95 V
  • Adjustable switching frequency
    (200 kHz to 1.2 MHz)
  • Synchronizes to an external clock
  • Provides 180° out-of-phase clock signal
  • Adjustable slow start
  • Output voltage sequencing / tracking
  • Power good output
  • Programmable undervoltage lockout (UVLO)
  • Overcurrent and overtemperature protection
  • Pre-bias output start-up
  • Operating temperature range: –40°C to 85°C
  • Enhanced thermal performance: 13.3°C/W
  • Meets EN55022 Class B emissions
    • Integrated shielded inductor
  • Create a custom design using the LMZ31704 with the WEBENCH® Power Designer
  • Complete integrated power solution allows
    small footprint, low-profile design
  • 10-mm × 10-mm × 4.3-mm package
    • Pin compatible with LMZ31710 and LMZ31707
  • Efficiencies up to 95%
  • Eco-mode™ / light load efficiency (LLE)
  • Wide-output voltage adjust
    0.6 V to 5.5 V, with 1% reference accuracy
  • Supports parallel operation for higher current
  • Optional split power rail allows
    input voltages down to 2.95 V
  • Adjustable switching frequency
    (200 kHz to 1.2 MHz)
  • Synchronizes to an external clock
  • Provides 180° out-of-phase clock signal
  • Adjustable slow start
  • Output voltage sequencing / tracking
  • Power good output
  • Programmable undervoltage lockout (UVLO)
  • Overcurrent and overtemperature protection
  • Pre-bias output start-up
  • Operating temperature range: –40°C to 85°C
  • Enhanced thermal performance: 13.3°C/W
  • Meets EN55022 Class B emissions
    • Integrated shielded inductor
  • Create a custom design using the LMZ31704 with the WEBENCH® Power Designer

The LMZ31704 power module is an easy-to-use integrated power solution that combines a 4-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 10 × 10 × 4.3 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 and excellent power dissipation capability with a thermal impedance of 13.3°C/W. The LMZ31704 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 LMZ31704 power module is an easy-to-use integrated power solution that combines a 4-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 10 × 10 × 4.3 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 and excellent power dissipation capability with a thermal impedance of 13.3°C/W. The LMZ31704 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

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Type Title Date
* Data sheet LMZ31704 4-A Power Module with 2.95-V to 17-V Input and Current Sharing in QFN Package datasheet (Rev. E) PDF | HTML 25 Feb 2020
User guide LMZ31704 2-Phase Power Module Evaluation Module User's Guide (Rev. A) PDF | HTML 31 Jan 2022
User guide LMZ3170x Power Module Evaluation Module User's Guide (Rev. B) PDF | HTML 31 Jan 2022
Selection guide Innovative DC/DC Power Modules Selection Guide (Rev. D) 14 Oct 2021
More literature Soldering Considerations for Power Modules (Rev. B) PDF | HTML 17 May 2021
More literature Soldering Requirements for BQFN Packages (Rev. C) 05 Mar 2020
More literature Practical Thermal Design With DC/DC Power Modules (Rev. A) 20 Nov 2019
Technical article FPGA power made simple: design steps 20 Nov 2017
More literature Simplify low EMI design with power modules 20 Nov 2017
More literature Working With QFN Power Modules (Rev. A) 08 Jun 2017
More literature Power Module MSL Ratings 20 Jan 2017
More literature Using LMZ31710 for Higher Output Voltages 09 Nov 2015
More literature Adjusting LMZ3 Output Voltage with LM10010/1 11 Feb 2014
More literature LMZ31710, LMZ31707, LMZ31704 Parallel 02 Jul 2013
More literature 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

LMZ31704EVM-003 — LMZ31704 2.95V to 17V, 4A Step-Down Power Module Evaluation Board

The Texas Instruments LMZ31704EVM-003 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMZ31704 4A Power Module. The EVM operates with an input voltage range of 2.95V to 17V. The output voltage can be selected from four preset values using a jumper (0.6V, 0.9V, (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

LMZ31704 PSpice Average Model

SLVM963.ZIP (29 KB) - PSpice Model
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Simulation model

LMZ31704 PSpice Transient Model

SLVMA15.ZIP (145 KB) - PSpice Model
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Simulation model

LMZ31704 Unencrypted PSpice Transient Model

SLVMAQ7.ZIP (7 KB) - PSpice Model
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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 (...)
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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

PMP10630 — Xilinx Kintex UltraScale XCKU040 FPGA Power Solution, 6W Reference Design

The PMP10630 reference design is a complete high density power solution for Xilinx® Kintex® UltraScale™ XCKU040 FPGA. This design uses an optimal combination of SIMPLE SWITCHER® modules and LDOs to provide all the necessary voltage rails in a small solution size of 36 x 43 mm (1.4 (...)
Test report: PDF
Schematic: PDF
Package Pins Download
B3QFN (RVQ) 42 View options

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