Product details

Vin (Min) (V) 3.8 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 34 Iout (Max) (A) 3 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 Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
Vin (Min) (V) 3.8 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 34 Iout (Max) (A) 3 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 Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
HSOIC (DDA) 8 19 mm² 4.9 x 3.9 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: 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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Type Title Date
* Data sheet LMR33630SIMPLE SWITCHER® 3.8-V to 36-V, 3-A Synchronous Step-down Voltage Converter datasheet (Rev. F) PDF | HTML 24 Nov 2020
Application note Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) PDF | HTML 26 Jul 2021
Application note Designing a Motorized Resistive Load PDF | HTML 21 Jul 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
Application note Working with Inverting Buck-Boost Converters (Rev. A) 14 May 2020
Technical article 3 tips when designing a power stage for servo and AC drives 20 Nov 2019
Application note Achieving CISPR-22 EMI Standards With HotRod™ Buck Designs (Rev. A) 17 Sep 2019
Technical article Design a pre-tracking regulator, part 2: for a negative LDO 26 Apr 2019
Application note 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
Technical article Designing a pre-tracking regulator, part 1: for a positive-output LDO 18 Feb 2019
EVM User's guide LMR33630EVM User's Guide (Rev. A) 01 Mar 2018
EVM User's guide LMR33630xRNXEVM User's Guide 22 Feb 2018

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.
Not available on TI.com
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.
Not available on TI.com
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.
Not available on TI.com
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.
Not available on TI.com
Simulation model

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

SNVMBF6A.ZIP (159 KB) - PSpice Model
Simulation model

LMR33630B Inverting and Non-Inverting PSpice Transient Model

SNVMBH2.ZIP (127 KB) - PSpice Model
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 (...)
Calculation tool

Mode Transitions Calculator LMR336x0 LMR360xx

SNVC234.ZIP (442 KB)
Calculation tool

LMR336x0 Component Calculator

SNVR484.ZIP (938 KB)
Reference designs

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 (...)
Schematic: 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 (...)
Schematic: PDF
Reference designs

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

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
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  • Qualification summary
  • Ongoing reliability monitoring

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