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LMR33630

ACTIVE

SIMPLE SWITCHER® 3.8V to 36V, 3A Synchronous Buck Converter With Ultra-Low EMI

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Data sheet

LMR33630

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck Iout (max) (A) 3 Vin (max) (V) 36 Vin (min) (V) 3.8 Vout (max) (V) 34 Vout (min) (V) 1 Features Enable, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Synchronous Rectification, Wettable flanks package EMI features Low parasitic Hotrod packaging Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.000024 Duty cycle (max) (%) 98 TI functional safety category Functional Safety-Capable
Rating Catalog Topology Buck Iout (max) (A) 3 Vin (max) (V) 36 Vin (min) (V) 3.8 Vout (max) (V) 34 Vout (min) (V) 1 Features Enable, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Synchronous Rectification, Wettable flanks package EMI features Low parasitic Hotrod packaging Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.000024 Duty cycle (max) (%) 98 TI functional safety category Functional Safety-Capable
HSOIC (DDA) 8 29.4 mm² (4.9 mm × 6 mm) VQFN-HR (RNX) 12 6 mm² (3 mm × 2 mm)
  • 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: 3 A
    • 75-mΩ/50-mΩ RDS-ON power MOSFETs
    • 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 TPSM53603 module for faster time to market
  • Create a custom design using the LMR33630 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: 3 A
    • 75-mΩ/50-mΩ RDS-ON power MOSFETs
    • 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 TPSM53603 module for faster time to market
  • Create a custom design using the LMR33630 with the WEBENCH Power Designer

The LMR33630 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 LMR33630 drives up to 3 A of load current from an input of up to 36 V. The LMR33630 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 LMR33630 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 LMR33630 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 LMR33630 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 LMR33630 drives up to 3 A of load current from an input of up to 36 V. The LMR33630 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 LMR33630 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 LMR33630 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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Top documentation Type Title Format options Date
* Data sheet LMR33630 SIMPLE SWITCHER® 3.8-V to 36-V, 3-A Synchronous Step-down Voltage Converter datasheet (Rev. F) PDF | HTML Nov 24, 2020
Technical article How to design a high-voltage DCM inverting charge pump converter PDF | HTML Aug 13, 2025
Functional safety information LMR336x0 Functional Safety, FIT Rate, FMD and Pin FMA (Rev. B) PDF | HTML Mar 20, 2024
Application note Working with Inverting Buck-Boost Converters (Rev. B) PDF | HTML Oct 18, 2022
Application note Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) PDF | HTML Jul 26, 2021
Application note Designing a Motorized Resistive Load PDF | HTML Jul 21, 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 8, 2021
Technical article 3 tips when designing a power stage for servo and AC drives PDF | HTML Nov 20, 2019
Application note Achieving CISPR-22 EMI Standards With HotRod™ Buck Designs (Rev. A) Sep 17, 2019
Technical article Design a pre-tracking regulator, part 2: for a negative LDO PDF | HTML Apr 26, 2019
Application note Understanding Mode Transitions for LMR33620/30 and LMR36006/15 Apr 4, 2019
Technical article Designing a pre-tracking regulator, part 1: for a positive-output LDO PDF | HTML Feb 18, 2019
Technical article How a DC/DC converter package and pinout design can enhance automotive EMI perform PDF | HTML Sep 4, 2018
Technical article A review of EMI standards, part 2 – radiated emissions PDF | HTML Jul 5, 2018
Technical article How to increase system reliability and simplify design using DC/DC converters PDF | HTML Jun 13, 2016

Design & development

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

Evaluation board

LMR33630ADDAEVM — LMR33630 Synchronous Step-Down Converter Evaluation Module

The LMR33630ADDAEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR33630 synchronous step-down converter.  The LMR33630 provides exceptional efficiency and accuracy in a very small solution size.
User guide: PDF
Supported products & hardware
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Evaluation board

LMR33630ARNXEVM — LMR33630 Synchronous Step Down Converter Evaluation Module

The LMR33630 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR33630A 400kHz synchronous step-down converter.  The LMR33630 provides exceptional efficiency and accuracy in a very small solution size.
User guide: PDF
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Evaluation board

LMR33630CDDAEVM — LMR33630 Synchronous Step-Down Converter Evaluation Module

The LMR33630 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR33630 synchronous step-down converter.  The LMR33630 provides exceptional efficiency and accuracy in a very small solution size.
User guide: PDF
Supported products & hardware
In stock
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Evaluation board

LMR33630CRNXEVM — LMR33630 Synchronous Step Down Converter Evaluation Module

The LMR33630 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR33630C 2.1MHz synchronous step-down converter.  The LMR33630 provides exceptional efficiency and accuracy in a very small solution size.
User guide: PDF
Supported products & hardware
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Simulation model

LMR33630A Non-Inverting and inverting PSpice Transient Model (Rev. A)

SNVMBF6A.ZIP (159 KB) - PSpice model
Supported products & hardware
Simulation model

LMR33630A Non-Inverting and inverting Unencrypted PSpice Transient Model (Rev. A)

SNVMBF9A.ZIP (7 KB) - PSpice model
Supported products & hardware
Simulation model

LMR33630B Inverting and Non-Inverting PSpice Transient Model

SNVMBH2.ZIP (127 KB) - PSpice model
Supported products & hardware
Simulation model

LMR33630B Unencrypted PSpice Inverting and Non-Inverting Transient Model

SNVMBH1.ZIP (7 KB) - PSpice model
Supported products & hardware
Simulation model

LMR33630C Unencrypted PSpice Inverting and Non-Inverting Transient Model (Rev. A)

SNVMBG5A.ZIP (128 KB) - PSpice model
Supported products & hardware
Calculation tool

SNVC234 — Mode Transitions Calculator LMR336x0 LMR360xx

Supported products & hardware
Calculation tool

SNVR484 — LMR336x0 Component Calculator

Supported products & hardware
Reference design

TIDA-010009 — Compact, efficient, 24-V input auxiliary power supply reference design for servo drives

This reference design showcases a method to generate power supplies required in a servo or AC drive including the analog and digtal I/O interfaces, encoder supply, isolated transceivers and digital processing block. This design also implements protection against input reverse polarity, output (...)
Supported products & hardware
Reference design

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 (...)
Supported products & hardware
Reference design

TIDA-010072 — Air blower and valve control reference design for respiratory applications

This reference design provides a compact system design capable of supporting motor acceleration and deceleration up to ±200 kRPM/s, which is a key requirement in many respirator applications. The design supports a number of offboard C2000 controllers including (...)
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
HSOIC (DDA) 8 Ultra Librarian
VQFN-HR (RNX) 12 Ultra Librarian
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