4.5V to 42V, 2A Step-Down Power Module in QFN Package


Product details


Iout (Max) (A) 2 Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 2.5 Vout (Max) (V) 7.5 Soft start Adjustable Features EMI Tested, Enable, Frequency Synchronization, Light Load Efficiency, Power Good, Remote Sense Operating temperature range (C) -40 to 105 Iq (Typ) (uA) 600 Regulated outputs (#) 1 Switching frequency (Max) (kHz) 1000 Switching frequency (Min) (kHz) 200 Duty cycle (Max) (%) 90 Topology Buck, Inverting Buck-Boost, Synchronous Buck open-in-new Find other Buck modules (integrated inductor)

Package | Pins | Size

B3QFN (RVQ) 43 B3QFN (RVQ) 43 100 mm² 10 x 10 open-in-new Find other Buck modules (integrated inductor)


  • Complete Integrated Power Solution Allows
    Small Footprint, Low-Profile Design
  • 10 mm × 10 mm × 4.3 mm Package
  • Wide-Output Voltage Adjust (2.5 V to 7.5 V)
  • Adjustable Switching Frequency
    (200 kHz to 1 MHz)
  • Synchronizes to an External Clock
  • Automatic PFM Mode for Light Load Efficiency
  • Adjustable Soft-Start Time
  • Output Voltage Sequencing / Tracking
  • Power Good Output
  • Programmable Undervoltage Lockout (UVLO)
  • Over-Temperature Thermal Shutdown Protection
  • Over-Current Protection (Hiccup Mode)
  • Pre-Bias Output Start-Up
  • Operating Temperature Range: –40°C to 105°C
  • Enhanced Thermal Performance: 14°C/W
  • Meets EN55022 Class B Emissions
    – Integrated Shielded Inductor
  • Create a Custom Design using the LMZ34202 with the WEBENCH® Power Designer
open-in-new Find other Buck modules (integrated inductor)


The LMZ34202 power module is an easy-to-use integrated power supply that combines a 2-A DC-DC converter with a shielded inductor and passives into a low profile, QFN package. This total power solution allows as few as three external components while maintaining an ability to adjust key parameters to meet specific design requirements.

The QFN package is easy to solder to a printed circuit board, allows reflow profiles up to 245°C, and has excellent power dissipation capability. The LMZ34202 offers flexibilty with many features and is ideal for powering a wide range of devices and systems.

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

Technical documentation

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Type Title Date
* Data sheet LMZ34202 4.5-V to 42-V Input, 2-A Power Module datasheet (Rev. C) Jun. 20, 2018
Application note Soldering Considerations for Power Modules (Rev. B) May 17, 2021
Technical article Powering medical imaging applications with DC/DC buck converters Nov. 24, 2020
White paper Simplify low EMI design with power modules Nov. 20, 2017
White paper Benefits and trade-offs of various power-module package options Aug. 02, 2017
Selection guide TI Components for Aerospace and Defense Guide (Rev. E) Mar. 22, 2017
User guide LMZ34202 Simple Switcher® Power Module Evaluation Module Feb. 04, 2016

Design & development

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Hardware development

document-generic User guide
The LMZ34202 evaluation board is configured to evaluate the operation of the LMZ34202 power module. The input voltage range is 4.5V to 42V. The output voltage can be selected from 5 popular voltages (2.5V, 3.3V, 5.0V, 6.0, & 7.5V) using a single jumper. The switching frequency can also be (...)
  • 4.5V to 42V Input Voltage Range
  • 2.5V, 3.3V, 5.0V, 6.0V and 7.5V Output Voltage Jumper
  • Up to 2A of Output Current

Design tools & simulation

SNVMAM6.ZIP (149 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

High efficiency power supply architecture reference design for protection relay processor module
TIDA-010011 — This reference design showcases various power architectures for generating multiple voltage rails for an application processor module, requiring >1A load current and high efficiency . The required power supply is generated using 5-, 12- or 24-V DC input from the backplane. Power supplies are (...)
document-generic Schematic
400-W Continuous, Scalable, ±2.5- to ±150-V, Programmable Ultrasound Power Supply Reference Design
TIDA-01352 — The TIDA-01352 enables modular and efficient power scaling capability by providing a solution for digitally programmable power supply for powering ultrasound transmit circuit. The design uses push-pull topology to generate high-voltage (HV) and low- (LV) or MID- voltage power supplies. The HV rails (...)
document-generic Schematic
Space Optimized Wide Vin Triple-Output Power Module Reference Design
TIDA-00783 The TIDA-00783.1 reference design is a triple output wide Vin power module design. It provides 3.3V, 1.8V and 1.2V output, at 6W total power. The layout is optimized for space constrained applications.
document-generic Schematic
Space-optimized DC/DC Inverting Power Module Reference Design with Minimal BOM Count
TIDA-00808 The TIDA-00808 is a simple DC/DC inverting power supply reference design for industrial applications. It takes a wide input voltage between 4.5V and 55V and generates a negative 5V @ 1.75A output with 86% peak efficiency. Since this design is inverting, the maximum output current increases as the (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
B3QFN (RVQ) 43 View options

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