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LTC3871ELXE-1#PBF - Analog Devices

Description: DC/DC Cntrlr Single-OUT Step Down 550kHz Automotive 48-Pin LQFP EP Tray

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LTC3871ELXE-1#PBF - Analog Devices PCB footprint - Quad Flat Packages - Quad Flat Packages - LXE Package 48-Lead Plastic Exposed Pad LQFP (7mm × 7mm)
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LTC3871ELXE-1#PBF - Analog Devices - 3D model - Quad Flat Packages - LXE Package 48-Lead Plastic Exposed Pad LQFP (7mm × 7mm)
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LTC3871ELXE-1#PBF Details

  • Manufacturer Part Number:

    LTC3871ELXE-1#PBF

  • Brand Name:

    Analog Devices Inc

  • Pbfree Code:

    No

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Pin Count:

    48

  • Manufacturer Package Code:

    05-08-1832

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.01

  • Date Of Intro:

    2018-12-11

  • Manufacturer:

    Analog Devices Inc

  • YTEOL:

    9

  • Analog IC - Other Type:

    SWITCHING CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • JESD-30 Code:

    S-PQFP-G48

  • JESD-609 Code:

    e3

  • Length:

    7 mm

  • Moisture Sensitivity Level:

    3

  • Number of Functions:

    1

  • Number of Terminals:

    48

  • Operating Temperature-Max:

    125 °C

  • Operating Temperature-Min:

    -40 °C

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    HLFQFP

  • Package Shape:

    SQUARE

  • Package Style:

    FLATPACK, HEAT SINK/SLUG, LOW PROFILE, FINE PITCH

  • Peak Reflow Temperature (Cel):

    260

  • Seated Height-Max:

    1.6 mm

  • Surface Mount:

    YES

  • Switcher Configuration:

    BUCK-BOOST

  • Technology:

    CMOS

  • Temperature Grade:

    AUTOMOTIVE

  • Terminal Finish:

    Matte Tin (Sn)

  • Terminal Form:

    GULL WING

  • Terminal Pitch:

    0.5 mm

  • Terminal Position:

    QUAD

  • Width:

    7 mm

LTC3871ELXE-1#PBF Frequently Asked Questions (FAQs)

  • A good PCB layout for the LTC3871 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 LTC3871, 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, and a DC resistance that is less than 10% of the output impedance. Additionally, choose an inductor with a core material that is suitable for high-frequency operation, such as ferrite or powdered iron.
  • The maximum ambient temperature rating for the LTC3871 is 85°C, but the device can operate up to 125°C with derating. It's essential to consider the thermal design and heat sinking to ensure the device operates within its specified temperature range.
  • The LTC3871 output voltage is set using the FB pin and an external resistor divider network. The FB pin is connected to the output voltage through a resistor divider, and the ratio of the resistors determines the output voltage. The datasheet provides a formula to calculate the resistor values for a specific output voltage.
  • The SYNC/MODE pin on the LTC3871 allows the user to synchronize the switching frequency with an external clock signal or to select between forced continuous conduction mode (FCCM) and pulse-skipping mode (PSM). In FCCM, the converter operates continuously, while in PSM, the converter skips pulses to reduce switching losses at light loads.

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LTC3871ELXE-1#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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