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LTC3874EUFD#PBF - Analog Devices

Description: Phase Extender for High Phase Count Voltage Rails n Accurate Phase-to-Phase Current Sharing n Sub-Milliohm DCR Current Sensing n Phase-Lockable Fixed Frequency 250kHz to 1MHz n Immediate Response to Master IC's Fault n Up to 12 Phase Operation n Wide VIN Range: 4.5V to 38V

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LTC3874EUFD#PBF - Analog Devices - PCB symbol
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PCB Footprints
LTC3874EUFD#PBF - Analog Devices PCB footprint - Quad Flat No-Lead - Quad Flat No-Lead - 28-Lead (4mm × 5mm) Plastic QFN
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LTC3874EUFD#PBF - Analog Devices - 3D model - Quad Flat No-Lead - 28-Lead (4mm × 5mm) Plastic QFN
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LTC3874EUFD#PBF Details

  • Manufacturer Part Number:

    LTC3874EUFD#PBF

  • Brand Name:

    Analog Devices Inc

  • Pbfree Code:

    No

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Package Description:

    4 X 5 MM, LEAD FREE, PLASTIC, MO-220WXXX-X, QFN-28

  • Pin Count:

    28

  • Manufacturer Package Code:

    05-08-1712

  • Country Of Origin:

    Malaysia

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.01

  • Manufacturer:

    Analog Devices Inc

  • YTEOL:

    10

  • Additional Feature:

    OUTPUT VOLTAGE RANGE UP TO 5.5 VOLT

  • Analog IC - Other Type:

    SWITCHING CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    CONSTANT FREQUENCY

  • Input Voltage-Max:

    38 V

  • Input Voltage-Min:

    4.5 V

  • Input Voltage-Nom:

    12 V

  • JESD-30 Code:

    R-PQCC-N28

  • JESD-609 Code:

    e3

  • Length:

    5 mm

  • Moisture Sensitivity Level:

    1

  • Number of Functions:

    1

  • Number of Terminals:

    28

  • Operating Temperature-Max:

    125 °C

  • Operating Temperature-Min:

    -40 °C

  • Output Voltage-Max:

    5.5 V

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    HVQCCN

  • Package Shape:

    RECTANGULAR

  • Package Style:

    CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE

  • Seated Height-Max:

    0.8 mm

  • Surface Mount:

    YES

  • Switcher Configuration:

    BUCK

  • Switching Frequency-Max:

    1000 kHz

  • Technology:

    CMOS

  • Temperature Grade:

    AUTOMOTIVE

  • Terminal Finish:

    Matte Tin (Sn)

  • Terminal Form:

    NO LEAD

  • Terminal Pitch:

    0.5 mm

  • Terminal Position:

    QUAD

  • Width:

    4 mm

LTC3874EUFD#PBF Frequently Asked Questions (FAQs)

  • A good PCB layout for the LTC3874EUFD 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 loop areas. A 4-layer board with a dedicated power plane and a separate ground plane is recommended. Additionally, it's essential to follow the datasheet's guidelines for component placement and routing.
  • When selecting an inductor for the LTC3874EUFD, consider the following factors: inductance value, DC resistance, saturation current, and core material. A good starting point is to choose an inductor with an inductance value between 1µH and 10µH, a DC resistance less than 100mΩ, and a saturation current greater than the peak current of the converter. The core material should be able to handle the switching frequency and peak current.
  • The maximum ambient temperature for the LTC3874EUFD is 85°C, but it's essential to consider the junction temperature (TJ) as well. The maximum TJ is 150°C, and the device should be derated above 85°C ambient temperature to ensure reliable operation.
  • Yes, the LTC3874EUFD can be used in a synchronous buck configuration. In this mode, the internal switch is used as the high-side switch, and an external low-side switch (e.g., a MOSFET) is used to reduce losses and improve efficiency. However, it's crucial to ensure that the external switch is properly synchronized with the internal switch to avoid shoot-through currents.
  • To troubleshoot issues with the LTC3874EUFD, start by verifying the PCB layout and component selection. Check for proper decoupling, filtering, and routing. Use an oscilloscope to monitor the switching waveforms, output voltage, and current. Look for signs of oscillation, ringing, or instability. Consult the datasheet and application notes for guidance on troubleshooting and optimization techniques.

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LTC3874EUFD#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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