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LM3481MM electronics ic chips High Efficiency Low Side N Channel Controller

Categories Electronic IC Chips
Brand Name: Anterwell
Model Number: LM3481MM
Certification: new & original
Place of Origin: original factory
MOQ: 10pcs
Price: Negotiate
Payment Terms: T/T, Western Union, Paypal
Supply Ability: 7600pcs
Delivery Time: 1 day
Packaging Details: Please contact me for details
VIN pin Voltage: -0.4V to 50V
FB Pin Voltage: -0.4V to 6V
FA/SYNC/SD Pin Voltage: -0.4V to 6V
Peak Driver Output Current: 1.0A
Storage Temperature: −65°C to +150°C
Junction Temperature: +150°C
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    LM3481MM electronics ic chips High Efficiency Low Side N Channel Controller

    LM3481MM electronics ic chips High Efficiency Low Side N Channel Controller


    General Description

    The LM3481 is a versatile Low-Side N-FET high performance controller for switching regulators. It is suitable for use in topologies requiring a low-side FET, such as boost, flyback, SEPIC, etc. The LM3481 can be operated at extremely high switching frequencies in order to reduce the overall solution size. The switching frequency of the LM3481 can be adjusted to any value between 100 kHz and 1 MHz 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 has built in protection features such as thermal shutdown, short-circuit protection and over voltage protection. Power saving shutdown mode reduces the total supply current to 5µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.


    Key Specifications

    ■ Wide supply voltage range of 2.97V to 48V

    ■ 100 kHz to 1 MHz Adjustable and Synchronizable clock frequency

    ■ ±1.5% (over temperature) internal reference

    ■ 10 µA shutdown current (over temperature)


    Features

    ■ 10-lead MSOP package

    ■ Internal push-pull driver with 1A 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


    Applications

    ■ Distributed Power Systems

    ■ Notebook, PDA, Digital Camera, and other Portable Applications

    ■ Offline Power Supplies

    ■ Set-Top Boxes


    Absolute Maximum Ratings (Note 1)

    If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.


    VIN pin Voltage -0.4V to 50V

    FB Pin Voltage -0.4V to 6V

    FA/SYNC/SD Pin Voltage -0.4V to 6V

    COMP Pin Voltage -0.4V to 6V

    UVLO Pin Voltage -0.4V to 6V


    VCC Pin Voltage -0.4V to 6V

    DR Pin Voltage -0.4V to 6V

    ISEN Pin Voltage –0.4V to 600 mV

    Peak Driver Output Current 1.0A

    Power Dissipation Internally Limited


    Storage Temperature Range −65°C to +150°C

    Junction Temperature +150°C

    ESD Susceptibilty

    Human Body Model (Note 2) 2 kV


    Lead Temperature

    MM Package

    Vapor Phase (60 sec.) 215°C

    Infared (15 sec.) 220°C


    Operating Ratings (Note 1)

    Supply Voltage 2.97V to 48V

    Junction Temperature Range −40°C to +125°C

    Switching Frequency Range 100 kHz to 1 MHz

    Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicates conditions for which the device is intended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions.

    Note 2: The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin


    Typical Application Circuit


    Connection Diagram


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