SIMPLE SWITCHER® 3.8V to 36V, 2A Synchronous Buck Converter With Ultra-Low EMI


Product details


Vin (Min) (V) 3.8 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 34 Iout (Max) (A) 2 Iq (Typ) (uA) 24 Switching frequency (Min) (kHz) 400 Switching frequency (Max) (kHz) 2100 Features Enable, Light Load Efficiency, Over Current Protection, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Wettable Flanks Package Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HSOIC (DDA) 8 19 mm² 4.9 x 3.9 VQFN-HR (RNX) 12 6 mm² 3 x 2 open-in-new Find other Buck converters (integrated switch)


  • Functional Safety-Capable
  • Configured for rugged industrial applications
    • Input voltage range: 3.8 V to 36 V
    • Output voltage range: 1 V to 24 V
    • Output current: 2 A
    • Peak-current-mode control
    • Short minimum on-time of 68 ns
    • Frequency: 400 kHz, 1.4 MHz, 2.1 MHz
    • Junction temperature range –40°C to +125°C
    • Low EMI and low switching noise
    • Integrated compensation network
  • Low EMI and switching noise
    • HotRod™ package
    • Parallel input current paths
  • High power conversion at all loads
    • Peak efficiency > 95%
    • Low operating quiescent current of 25 µA
  • Flexible system interface
    • Power-good flag and precision enable
  • Use TPSM53602 module for faster time to market
  • Create a custom design using the LMR33620 with the WEBENCH Power Designer
open-in-new Find other Buck converters (integrated switch)


The LMR33620 SIMPLE SWITCHER regulator is an easy-to-use, synchronous, step-down DC/DC converter that delivers best-in-class efficiency for rugged industrial applications. The LMR33620 drives up to 2 A of load current from an input of up to 36 V. The LMR33620 provides high light load efficiency and output accuracy in a very small solution size. Features such as a power-good flag and precision enable provide both flexible and easy-to-use solutions for a wide range of applications. The LMR33620 automatically folds back frequency at light load to improve efficiency. Integration eliminates most external components and provides a pinout designed for simple PCB layout. Protection features include thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection. The LMR33620 is available in an 8-pin HSOIC package and in a 12-pin 3 mm × 2 mm next generation VQFN package with wettable flanks. This device is also available in an AEC-Q100-qualified version.

open-in-new Find other Buck converters (integrated switch)
Similar products you might be interested in
Same functionality with different pin-out to the compared device.
TPSM53602 ACTIVE 36-V, 2-A step-down power module in small 5.5 x 5 x 4-mm Enhanced HotRod™ QFN with simple footprint Save board space, simplify design, and speed time to market with an integrated-inductor power module.

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 14
Type Title Date
* Data sheet LMR33620SIMPLE SWITCHER® 3.8-V to 36-V, 2-A Synchronous Step-down Voltage Converter datasheet (Rev. E) Nov. 24, 2020
Application note Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) Jul. 26, 2021
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators Apr. 21, 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr. 08, 2021
Functional safety information LMR336x0 Functional Safety, FIT Rate, FMD and Pin FMA (Rev. A) Mar. 02, 2021
Application note Working with Inverting Buck-Boost Converters (Rev. A) May 14, 2020
Technical article 3 tips when designing a power stage for servo and AC drives Nov. 20, 2019
Application note Understanding Mode Transitions for LMR33620/30 and LMR36006/15 Apr. 04, 2019
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
White paper Power modules for lab instrumentation Oct. 18, 2018
Technical article A review of EMI standards, part 2 – radiated emissions Jul. 05, 2018
User guide LMR33630EVM User's Guide (Rev. A) Mar. 01, 2018
User guide LMR33630xRNXEVM User's Guide Feb. 22, 2018
Technical article How to increase system reliability and simplify design using DC/DC converters Jun. 13, 2016

Design & development

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

Design tools & simulation

SNVMBG9A.ZIP (130 KB) - PSpice Model
SNVMBH4A.ZIP (124 KB) - PSpice Model
SNVMBH7A.ZIP (125 KB) - PSpice Model
SNVMBK7A.ZIP (177 KB) - PSpice Model
SNVMBK9A.ZIP (174 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
  • (...)
SNVC234.ZIP (442 KB)
SNVR484.ZIP (938 KB)

Reference designs

Non-isolated power architecture with diagnostics reference design for protection relay modules
TIDA-010055 — This reference design showcases non-isolated power supply architectures for protection relays with analog input/output and communication modules generated from 5-, 12-, or 24-V DC input. To generate the power supplies the design uses DC/DC converters with an integrated FET, a power module with an (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
SO PowerPAD (DDA) 8 View options
VQFN-HR (RNX) 12 View options

Ordering & quality

Information included:
  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​