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LTC3811EUHF#PBF - Analog Devices

Description: Buck Regulator Positive Output Step-Down DC-DC Controller IC 38-QFN (5x7) 4.5V ~ 30V 250kHz ~ 750kHz -40°C ~ 85°C (TA)

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LTC3811EUHF#PBF - Analog Devices - PCB symbol
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PCB Footprints
LTC3811EUHF#PBF - Analog Devices PCB footprint - Quad Flat No-Lead - Quad Flat No-Lead - UHF Package 38-Lead Plastic QFN (5mm × 7mm)
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3D Models
LTC3811EUHF#PBF - Analog Devices - 3D model - Quad Flat No-Lead - UHF Package 38-Lead Plastic QFN (5mm × 7mm)
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LTC3811EUHF#PBF Details

  • Manufacturer Part Number:

    LTC3811EUHF#PBF

  • Brand Name:

    Analog Devices Inc

  • Pbfree Code:

    No

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Package Description:

    5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38

  • Pin Count:

    38

  • Manufacturer Package Code:

    05-08-1701

  • Country Of Origin:

    Malaysia

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.01

  • Manufacturer:

    Analog Devices Inc

  • YTEOL:

    10

  • Analog IC - Other Type:

    DUAL SWITCHING CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    30 V

  • Input Voltage-Min:

    4.5 V

  • Input Voltage-Nom:

    12 V

  • JESD-30 Code:

    R-PQCC-N38

  • JESD-609 Code:

    e3

  • Length:

    7 mm

  • Moisture Sensitivity Level:

    1

  • Number of Functions:

    2

  • Number of Terminals:

    38

  • Operating Temperature-Max:

    85 °C

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    HVQCCN

  • Package Shape:

    RECTANGULAR

  • Package Style:

    CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE

  • Peak Reflow Temperature (Cel):

    260

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    0.8 mm

  • Surface Mount:

    YES

  • Switcher Configuration:

    PUSH-PULL

  • Switching Frequency-Max:

    750 kHz

  • Technology:

    CMOS

  • Temperature Grade:

    OTHER

  • Terminal Finish:

    Matte Tin (Sn)

  • Terminal Form:

    NO LEAD

  • Terminal Pitch:

    0.5 mm

  • Terminal Position:

    QUAD

  • Time@Peak Reflow Temperature-Max (s):

    30

  • Width:

    5 mm

LTC3811EUHF#PBF Frequently Asked Questions (FAQs)

  • A good PCB layout for the LTC3811EUHF involves keeping the high-frequency switching nodes (e.g., SW, VIN, and VOUT) away from sensitive analog nodes, using a solid ground plane, and minimizing trace lengths and widths to reduce parasitic inductance and capacitance. A 4-layer board with a dedicated power plane and a solid ground plane is recommended.
  • When selecting an inductor for the LTC3811EUHF, consider the inductor's saturation current, DC resistance, and core material. A good starting point is to choose an inductor with a saturation current rating of at least 1.5 times the maximum output current, a DC resistance of less than 100mΩ, and a core material with low core loss (e.g., ferrite or powdered iron).
  • The maximum ambient temperature for the LTC3811EUHF is 85°C, but the device can operate up to 125°C with derating. It's essential to consider the thermal design and ensure proper heat sinking to maintain a safe operating temperature.
  • Yes, the LTC3811EUHF is suitable for high-reliability and automotive applications. It's manufactured with a high-reliability process, and Analog Devices provides a range of support resources, including automotive-grade qualification and PPAP documentation, to help ensure compliance with industry standards.
  • To troubleshoot issues with the LTC3811EUHF, start by verifying the PCB layout, component selection, and soldering quality. Check for signs of overheating, and ensure that the input and output capacitors are properly selected and placed. Use an oscilloscope to monitor the switching waveforms and identify any signs of oscillation or instability. Consult the datasheet and application notes for guidance on troubleshooting and optimization techniques.

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LTC3811EUHF#PBF Overview

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About Analog Devices

Analog Devices Inc. is a global leader in the design and manufacturing of analog, mixed-signal, and digital signal processing integrated circuits and software solutions for the industrial, automotive, healthcare, communications industries. Analog Devices serves a diverse range of markets including industrial, automotive, healthcare, energy, aerospace, defense, and consumer electronics industries. Analog Devices’ product portfolio includes a wide range of ICs, modules, and subsystems.

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