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LM3481MM/NOPB

  • LM3481MM/NOPB

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LM3481MM/NOPB Overview

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.

LM3481MM/NOPB

Features

  • 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)

Product Parameters

  • genericPartNumber

    LM3481

  • partDescription

    2.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback

  • statusDescription

    This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

  • packageQtyCarrier

    1000|SMALL T&R

  • orderablePartNumber

    LM3481MM/NOPB

  • statusDisplay

    ACTIVE

  • packageQuantity

    1000

  • packagePins

    VSSOP (DGS)|10

Technical Documents

  • Modeling & Design of Current Mode Control Boost Converters (Rev. B)Details>>

  • Softstart Using Constant Current Constant Voltage ApproachDetails>>

  • LM34xx How to Design Flyback Converter with LM3481 Boost Controller (Rev. A)Details>>

  • AN-1990 Compensation for Current Mode Control SEPIC Converters (Rev. A)Details>>

  • Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC CoDetails>>

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