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L4981B - STMicroelectronics

Description: Current mode PF corrector,L4981B 5.1V

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L4981B - STMicroelectronics - PCB symbol
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L4981B - STMicroelectronics PCB footprint - Dual-In-Line Packages - Dual-In-Line Packages - DIP20_2
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L4981B - STMicroelectronics - 3D model - Dual-In-Line Packages - DIP20_2
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L4981B Details

  • Manufacturer Part Number:

    L4981B

  • Brand Name:

    STMicroelectronics

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Obsolete

  • Part Package Code:

    DIP

  • Package Description:

    DIP-20

  • Pin Count:

    20

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.60

  • Manufacturer:

    STMicroelectronics

  • YTEOL:

    0

  • Analog IC - Other Type:

    POWER FACTOR CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    19.5 V

  • Input Voltage-Min:

    11 V

  • Input Voltage-Nom:

    18 V

  • JESD-30 Code:

    R-PDIP-T20

  • JESD-609 Code:

    e3

  • Number of Functions:

    1

  • Number of Terminals:

    20

  • Operating Temperature-Max:

    125 °C

  • Operating Temperature-Min:

    -40 °C

  • Output Current-Max:

    2 A

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    DIP

  • Package Equivalence Code:

    DIP20,.3

  • Package Shape:

    RECTANGULAR

  • Package Style:

    IN-LINE

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    3.93 mm

  • Surface Mount:

    NO

  • Switcher Configuration:

    SINGLE

  • Switching Frequency-Max:

    115 kHz

  • Technology:

    BCDMOS

  • Temperature Grade:

    AUTOMOTIVE

  • Terminal Finish:

    MATTE TIN

  • Terminal Form:

    THROUGH-HOLE

  • Terminal Pitch:

    2.54 mm

  • Terminal Position:

    DUAL

  • Width:

    7.62 mm

L4981B Frequently Asked Questions (FAQs)

  • The maximum input voltage that can be applied to the L4981B is 60V, but it's recommended to keep it below 50V for reliable operation.
  • The inductor value depends on the output current, switching frequency, and input voltage. A good starting point is to use the inductor value recommended in the datasheet (e.g., 10uH for the L4981B). You can also use online inductor selection tools or consult with an applications engineer.
  • The bootstrap capacitor (CBOOT) is used to generate the high-side gate drive voltage. Choose a capacitor with a value between 10nF to 100nF, and a voltage rating that exceeds the maximum input voltage. A 22nF capacitor is a good starting point.
  • Ensure good thermal design by providing adequate heat sinking, using a thermally conductive PCB material, and keeping the component away from heat sources. Monitor the junction temperature (TJ) and adjust the design as needed to keep TJ below 150°C.
  • Keep the power components (L, C, and R) close together to minimize parasitic inductance and capacitance. Place the input and output capacitors close to the IC. Use a solid ground plane and avoid routing high-current traces near sensitive analog signals.

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L4981B Overview

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About STMicroelectronics

STMicroelectronics (ST) is a global semiconductor company that designs, manufactures, and markets a broad range of integrated circuits (ICs), discrete devices, and other electronic components. STMicroelectronics offers a diverse portfolio of semiconductor products covering a wide range of applications and industries. Their product categories include microcontrollers, analog and mixed-signal ICs, MEMS (Micro-Electro-Mechanical Systems) sensors, power management ICs, RF (Radio Frequency) transceivers, aut

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