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LT3957IUHE#PBF - Analog Devices

Description: Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch –6V to 6V –40°C to 125°C

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LT3957IUHE#PBF - Analog Devices - PCB symbol
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LT3957IUHE#PBF - Analog Devices PCB footprint - Other - Other - UHE Package Variation: UHE28MA 36-Lead Plastic QFN (5mm × 6mm)_2025-1
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LT3957IUHE#PBF - Analog Devices - 3D model - Other - UHE Package Variation: UHE28MA 36-Lead Plastic QFN (5mm × 6mm)_2025-1
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LT3957IUHE#PBF Details

  • Manufacturer Part Number:

    LT3957IUHE#PBF

  • Brand Name:

    Analog Devices Inc

  • Pbfree Code:

    No

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Package Description:

    5 X 6 MM, LEAD FREE, PLASTIC, QFN-36

  • Pin Count:

    28

  • Manufacturer Package Code:

    05-08-1836

  • Country Of Origin:

    Thailand

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.01

  • Manufacturer:

    Analog Devices Inc

  • YTEOL:

    10

  • Additional Feature:

    ALSO OPERATES AS LDO REGULATOR

  • Analog IC - Other Type:

    SWITCHING REGULATOR

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    40 V

  • Input Voltage-Min:

    3 V

  • Input Voltage-Nom:

    24 V

  • JESD-30 Code:

    R-PQCC-N36

  • JESD-609 Code:

    e3

  • Length:

    6 mm

  • Moisture Sensitivity Level:

    1

  • Number of Functions:

    1

  • Number of Terminals:

    36

  • Operating Temperature-Max:

    125 °C

  • Operating Temperature-Min:

    -40 °C

  • Output Current-Max:

    6.8 A

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    HVQCCN

  • Package Shape:

    RECTANGULAR

  • Package Style:

    CHIP CARRIER

  • Peak Reflow Temperature (Cel):

    260

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    0.8 mm

  • Surface Mount:

    YES

  • Switcher Configuration:

    BOOST

  • Switching Frequency-Max:

    1200 kHz

  • Technology:

    BIPOLAR

  • Temperature Grade:

    AUTOMOTIVE

  • 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

LT3957IUHE#PBF Frequently Asked Questions (FAQs)

  • The recommended PCB layout for optimal thermal performance involves placing the device on a 2-layer or 4-layer board with a solid ground plane on the bottom layer, and using thermal vias to connect the exposed pad to the ground plane. Additionally, keeping the input and output capacitors close to the device and using short, wide traces can help reduce thermal resistance.
  • To ensure reliable start-up and operation with a high-impedance input source, it is recommended to add a 1-10nF capacitor between the VIN pin and the input source, and to use a low-ESR input capacitor. Additionally, the input source should be able to provide a minimum of 10mA of current to ensure reliable start-up.
  • The maximum allowed voltage on the EN pin is 6V. Exceeding this voltage can cause damage to the device. It is recommended to use a voltage divider or a clamp circuit to limit the voltage on the EN pin to 6V or less.
  • The output voltage ripple and noise can be calculated using the equations provided in the datasheet. The output voltage ripple is primarily determined by the output capacitor value, ESR, and the switching frequency. The output noise is primarily determined by the switching frequency, output capacitor value, and the input voltage ripple.
  • The recommended input capacitor type is a low-ESR ceramic capacitor, such as an X5R or X7R dielectric. The recommended value is 10-22uF, depending on the input voltage and output current requirements. A larger input capacitor value can help reduce input voltage ripple and improve overall performance.

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LT3957IUHE#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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