Product details

Vin (Min) (V) 2.97 Vin (Max) (V) 48 Vout (Min) (V) 1.26 Vout (Max) (V) 500 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Iq (Typ) (mA) 3.7 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Pre-Bias Start-Up, UVLO Adjustable Duty cycle (Max) (%) 85 Rating Catalog Operating temperature range (C) -40 to 125
Vin (Min) (V) 2.97 Vin (Max) (V) 48 Vout (Min) (V) 1.26 Vout (Max) (V) 500 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Iq (Typ) (mA) 3.7 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Pre-Bias Start-Up, UVLO Adjustable Duty cycle (Max) (%) 85 Rating Catalog Operating temperature range (C) -40 to 125
VSSOP (DGS) 10 9 mm² 3 x 3
  • LM3481QMM are Automotive-Grade Products
    That are AEC-Q100 Grade 1 Qualified (–40°C to
    +125°C Operating Junction Temperature)
  • 10-Lead VSSOP Package
  • Internal Push-Pull Driver With 1-A Peak Current
    Capability
  • Current Limit and Thermal Shutdown
  • Frequency Compensation Optimized With a Capacitor
    and a Resistor
  • Internal Softstart
  • Current Mode Operation
  • Adjustable Undervoltage Lockout With Hysteresis
  • Pulse Skipping at Light Loads
  • Key Specifications
    • Wide Supply Voltage Range of 2.97 V to 48 V
    • 100-kHz to 1-MHz Adjustable and Synchronizable
      Clock Frequency
    • ±1.5% (Over Temperature) Internal
      Reference
    • 10-µA Shutdown Current (Over Temperature)
  • LM3481QMM are Automotive-Grade Products
    That are AEC-Q100 Grade 1 Qualified (–40°C to
    +125°C Operating Junction Temperature)
  • 10-Lead VSSOP Package
  • Internal Push-Pull Driver With 1-A Peak Current
    Capability
  • Current Limit and Thermal Shutdown
  • Frequency Compensation Optimized With a Capacitor
    and a Resistor
  • Internal Softstart
  • Current Mode Operation
  • Adjustable Undervoltage Lockout With Hysteresis
  • Pulse Skipping at Light Loads
  • Key Specifications
    • Wide Supply Voltage Range of 2.97 V to 48 V
    • 100-kHz to 1-MHz Adjustable and Synchronizable
      Clock Frequency
    • ±1.5% (Over Temperature) Internal
      Reference
    • 10-µA Shutdown Current (Over Temperature)

The LM3481 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is suitable for use in topologies requiring a low-side FET, such as boost, flyback, SEPIC, and so on. The LM3481 device can be operated at extremely high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481 device can be adjusted to any value between 100kHz and 1MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor.

The LM3481 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.

The LM3481 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is suitable for use in topologies requiring a low-side FET, such as boost, flyback, SEPIC, and so on. The LM3481 device can be operated at extremely high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481 device can be adjusted to any value between 100kHz and 1MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor.

The LM3481 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.

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Technical documentation

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Type Title Date
* Data sheet LM3481 / -Q1 High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters datasheet (Rev. F) 05 Nov 2012
Application note LM34xx How to Design Flyback Converter with LM3481 Boost Controller (Rev. A) 08 Apr 2019
Technical article How to add overvoltage protection to a synchronous boost controller 17 Sep 2018
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Eliminating noise from the factory floor 29 Sep 2016
User guide LM3481 flyback EVM User's Guide 19 May 2016
Technical article How do you generate a high voltage from a single cell Li Ion battery? 11 Dec 2015
Application note Softstart Using Constant Current Constant Voltage Approach 24 Jul 2015
Technical article Portable speaker power: Making the bass possible 12 May 2015
Application note Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC Co 11 Jul 2014
User guide AN-1756 LM3481 Evaluation Board (Rev. A) 01 May 2013
User guide AN-2094 LM3481 SEPIC Evaluation Board (Rev. A) 25 Apr 2013
Application note AN-1286 Compensation For The LM3478 Boost Controller (Rev. C) 23 Apr 2013
Application note AN-1484 Designing A SEPIC Converter (Rev. E) 23 Apr 2013
Application note AN-1990 Compensation for Current Mode Control SEPIC Converters (Rev. A) 23 Apr 2013
Application note Modeling & Design of Current Mode Control Boost Converters (Rev. B) 23 Apr 2013
User guide 330mW AC or DC Tiny Flyback Converter Power Supply Reference Design User Guide 27 Jan 2012

Design & development

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

Evaluation board

LM3481-FLYBACKEVM — Isolated Flyback Topology Evaluation Module for LM3481 Boost Controller

The Texas Instruments LM3481-FLYBACKEVM helps designers evaluate the performance of the LM3481 DC/DC Boost Controller in an isolated flyback topology. The EVM operates from an 5.5V to 36V input and provides a Isolated  12V output at 2A.
In stock
Limit: 5
Evaluation board

LM3481EVAL — High Efficiency Boost Switching Controller Eval Board with 12 Volt Output

The LM3481 is a current mode, low side N channel FET controller. It can be utilized in numerous configurations including a Boost, Flyback or SEPIC (Single Ended Primary Inductor Converter). This evaluation board demonstrates the flexibility of the LM3481 in a boost topology providing 12 volt output (...)

In stock
Limit: 5
Evaluation board

LM3481SEPICEVAL — LM3481 SEPIC Evaluation Board

The LM3481 SEPIC evaluation board is designed to provide the design engineer with a fully functional power converter solution with two output voltage options. It produces a selectable output voltage of 12 V at 1.25A or 5V at 3A. The switching frequency for the converter is set to 500 kHz. The (...)

In stock
Limit: 5
Simulation model

LM3481 PSpice Average Model

SNVM170.ZIP (54 KB) - PSpice Model
Simulation model

LM3481 TINA-TI Load Transient Reference Design (Rev. C)

SNVM229C.TSC (600 KB) - TINA-TI Reference Design
Simulation model

LM3481 TINA-TI TRANSIENT SPICE MODEL (Rev. C)

SNVM230C.ZIP (29 KB) - TINA-TI Spice Model
Simulation model

LM3481 TINA-TI Steady State Reference Design (Rev. B)

SNVM418B.TSC (600 KB) - TINA-TI Reference Design
Simulation model

LM3481 Unencrypted PSpice Transient Model (Rev. D)

SNVM713D.ZIP (117 KB) - PSpice Model
Simulation model

LM3481 TINA-TI Average Reference Design

SNVMA06.TSC (58 KB) - TINA-TI Reference Design
Simulation model

LM3481 TINA-TI Average Spice Model

SNVMA07.ZIP (8 KB) - TINA-TI Spice Model
Simulation model

LM3481 Unencrypted PSpice Average Model

SNVMA10.ZIP (1 KB) - PSpice Model
Simulation model

LM3481 STARTUP TINA-TI TRANSIENT REFERENCE DESIGN

SNVMBT9.TSC (140 KB) - TINA-TI Reference Design
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

FLYBUCK-FLYBACK-DESIGN-CALC — Fly-Buck and Flyback Topology Selector

This tool helps a power supply engineer to select the right isolated DC-DC topology based on the specifications. Depending on the topology chosen, the calculator also recommends the right IC for the design.
Many TI reference designs include the LM3481

Use our reference design selection tool to review and identify designs that best match your application and parameters.

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VSSOP (DGS) 10 View options

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  • Ongoing reliability monitoring

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