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Texas Instruments LM3481QMMX/NOPB

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Texas Instruments
10-TFSOP, 10-MSOP (0.118, 3.00mm Width)
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    LM3481QMMX/NOPB this integrated circuit is available in factory sealed anti static packs. at icwhale.com. Please read product page below detail information. including LM3481QMMX/NOPB price, data-sheet, in-stock availability, technical difficulties. Also. Quickly Enter the access of compare listing to find out replaceable electronic parts. If you want to retrieve comprehensive data for LM3481QMMX/NOPB to optimize the supply chain (including cross references, life-cycle, parametric, counterfeit risk, obsolescence managements forecasts), please contact to our Tech-supports team.

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    LM3481QMMX/NOPB Typical application Circuitry


    LM3481QMMX/NOPB is a high-efficiency, versatile PWM DC/DC converter integrated circuit. It operates as a boost, flyback, or SEPIC converter, making it highly adaptable to a broad range of applications that require voltage step-up or inversion. This device is known for its small form factor, high switching frequency, and ease of use, which makes it an ideal choice for compact and efficient power conversion solutions.


    LM3481QMMX/NOPB is widely used in applications such as power supply modules, portable devices, LED drivers, bias supplies, and anywhere a compact, efficient voltage conversion is required.

    Key Parameters and Features:

    - Versatility: Capable of operating in boost, flyback, or SEPIC configurations.

    - Adjustable Switching Frequency: Allows optimization for efficiency and component size.

    - Broad Input Voltage Range: Compatible with a Number of Power Sources. - Integrated Under-Voltage Lockout (UVLO): Ensures stable operation under varying input conditions.

    - Thermal Shutdown: Provides protection against overheating.

    Application Scenario: Designing a Boost Converter for Portable Power Supply

    In the context of designing a portable power supply, the LM3481QMMX/NOPB can be employed to step up a lower battery voltage to a higher voltage required by the load, ensuring stable operation of portable electronic devices.

    Circuit Design Considerations:

    1. Input Source: Begin with determining the input voltage range, which will affect the selection of other components. LM3481QMMX/NOPB's wide input range accommodates most battery technologies.

    2. Output Voltage Setting: The output voltage is set using a voltage divider connected to the FB pin (Pin 5). The values of the resistors in this divider are chosen based on the desired output voltage and the feedback reference voltage of the LM3481QMMX/NOPB.

    3. Inductor Selection (L1): The next step is to select an inductor (L1) that can manage the peak current without oversaturating. The inductance value influences the ripple current and the converter's response to load changes.

    4. Current Sense Resistor (RSENSE): Placed between the source of the power switch and ground, this resistor sets the current limit by sensing the switch current, providing protection against overcurrent conditions.

    5. Diode Selection (D1): A fast Schottky diode is recommended for the diode placed at the switch node (Pin 3) due to its low forward voltage drop and fast recovery time, which improves efficiency.

    6. Output Capacitor (COUT): The value and type of the output capacitor affect the output voltage ripple and stability. Low ESR capacitors are preferred to minimize ripple and enhance response.

    7. Frequency Setting: A resistor attached to the RT pin (Pin 6) controls the switching frequency. Efficiency and component size are balanced in the frequency selection.

    8. Compensation Network: Components connected to the COMP pin (Pin 1) are crucial for the stability of the control loop. This network must be tailored to the specific requirements of the application, considering factors like load range and dynamic response.

    Design Challenges:

    - Thermal Management: Efficient heat dissipation is crucial, especially in compact designs where LM3481QMMX/NOPB might operate at high ambient temperatures.

    - Layout Considerations: Careful PCB layout is essential to minimize EMI and ensure stable operation, particularly in high-frequency switching applications.

    - Component Selection: Each component must be chosen not just for its nominal value but also for its performance under the specific operating conditions of the circuit.

    When designing with LM3481QMMX/NOPB, a meticulous approach to component selection, circuit layout, and thermal management is key to achieving a high-performance, reliable power supply solution tailored to the specific needs of the application.

    LM3481QMMX/NOPB informationLM3481QMMX/NOPB information


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    6. What is the process for return or replacement of LM3481QMMX/NOPB?

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    (1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

    (2)We are informed of the defect described above within 90 days after the delivery of LM3481QMMX/NOPB.

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    (1)Inform us within 90 days

    (2)Obtain Requesting Return Authorizations

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