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Buck converters (integrated switch)

LMR33620

ACTIVE

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

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Data sheet

LMR33620

ACTIVE
Data sheet Order now

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) (mA) 0.024 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 TI functional safety category Functional Safety-Capable Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
Vin (min) (V) 3.8 Vin (max) (V) 36 Vout (min) (V) 1 Vout (max) (V) 34 Iout (max) (A) 2 Iq (typ) (mA) 0.024 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 TI functional safety category Functional Safety-Capable Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
HSOIC (DDA) 8 29.4 mm² 4.9 x 6 VQFN-HR (RNX) 12 6 mm² 3 x 2
  • 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
  • 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

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.

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.
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Technical documentation

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Type Title Date
* Data sheet LMR33620SIMPLE SWITCHER® 3.8-V to 36-V, 2-A Synchronous Step-down Voltage Converter datasheet (Rev. E) PDF | HTML 24 Nov 2020
More literature Working with Inverting Buck-Boost Converters (Rev. B) PDF | HTML 18 Oct 2022
More literature Camera Module Shutdown Power Sequence Solution PDF | HTML 25 Apr 2022
More literature Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) PDF | HTML 26 Jul 2021
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21 Apr 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Functional safety information LMR336x0 Functional Safety, FIT Rate, FMD and Pin FMA (Rev. A) PDF | HTML 02 Mar 2021
Technical article 3 tips when designing a power stage for servo and AC drives 20 Nov 2019
More literature Understanding Mode Transitions for LMR33620/30 and LMR36006/15 04 Apr 2019
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
More literature Power modules for lab instrumentation 18 Oct 2018
Technical article A review of EMI standards, part 2 – radiated emissions 05 Jul 2018
EVM User's guide LMR33630EVM User's Guide (Rev. A) 01 Mar 2018
EVM User's guide LMR33630xRNXEVM User's Guide 22 Feb 2018
Technical article How to increase system reliability and simplify design using DC/DC converters 13 Jun 2016

Design & development

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

Simulation model

LMR33620A Non-Inverting and inverting Unencrypted PSpice Transient Model (Rev. A)

SNVMBH7A.ZIP (125 KB) - PSpice Model
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Simulation model

LMR33620B Non-Inverting and inverting Unencrypted PSpice Transient Model (Rev. A)

SNVMBH4A.ZIP (124 KB) - PSpice Model
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Simulation model

LMR33620C Non-Inverting and inverting Unencrypted PSpice Transient Model (Rev. A)

SNVMBG9A.ZIP (130 KB) - PSpice Model
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Simulation model

LMR33620CQ3-Q1 Unencrypted Non-Inverting and Inverting PSpice Transient Model (Rev. A)

SNVMBK7A.ZIP (177 KB) - PSpice Model
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Simulation model

LMR33620CQ5-Q1 Unencrypted Non-Inverting and Inverting PSpice Transient Model (Rev. A)

SNVMBK9A.ZIP (174 KB) - PSpice Model
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Calculation tool

Mode Transitions Calculator LMR336x0 LMR360xx

SNVC234.ZIP (442 KB)
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Calculation tool

LMR336x0 Component Calculator

SNVR484.ZIP (938 KB)
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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

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This reference design uses the LM51551 as a secondary side regulated (SSR) flyback controller. It converts an input of 8 to 28.8 V and 24 V at a maximum power of 28.8 W. The supply starts up at a minimum input of 15.5 V and can operate to 8-V input. The design also includes the synchronous buck (...)
Test report: PDF
Reference designs

TIDA-010055 — Non-isolated power architecture with diagnostics reference design for protection relay modules

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 (...)
Design guide: PDF
Schematic: PDF
Package Pins Download
HSOIC (DDA) 8 View options
VQFN-HR (RNX) 12 View options

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