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LTC3857EUH#PBF - Analog Devices

Description: Switching Voltage Regulators Low IQ, Dual, 2-Phase Synchronous Step Down Controller

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LTC3857EUH#PBF - Analog Devices - PCB symbol
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LTC3857EUH#PBF - Analog Devices PCB footprint - Quad Flat No-Lead - Quad Flat No-Lead - UH (32-Lead QFN)
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LTC3857EUH#PBF - Analog Devices - 3D model - Quad Flat No-Lead - UH (32-Lead QFN)
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LTC3857EUH#PBF Details

  • Manufacturer Part Number:

    LTC3857EUH#PBF

  • Brand Name:

    Analog Devices Inc

  • Pbfree Code:

    No

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Package Description:

    5 X 5 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-32

  • Pin Count:

    32

  • Manufacturer Package Code:

    05-08-1693

  • Country Of Origin:

    Malaysia

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.01

  • Manufacturer:

    Analog Devices Inc

  • YTEOL:

    10

  • Additional Feature:

    ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 24V

  • Analog IC - Other Type:

    SWITCHING CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    38 V

  • Input Voltage-Min:

    4 V

  • Input Voltage-Nom:

    12 V

  • JESD-30 Code:

    S-PQCC-N32

  • JESD-609 Code:

    e3

  • Length:

    5 mm

  • Moisture Sensitivity Level:

    1

  • Number of Functions:

    1

  • Number of Terminals:

    32

  • Operating Temperature-Max:

    85 °C

  • Output Voltage-Max:

    24 V

  • Output Voltage-Min:

    0.8 V

  • Output Voltage-Nom:

    5.1 V

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    HVQCCN

  • Package Shape:

    SQUARE

  • 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:

    PHASE-SHIFT

  • Switching Frequency-Max:

    850 kHz

  • Technology:

    CMOS

  • Temperature Grade:

    OTHER

  • Terminal Finish:

    Matte Tin (Sn) - annealed

  • Terminal Form:

    NO LEAD

  • Terminal Pitch:

    0.5 mm

  • Terminal Position:

    QUAD

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

    30

  • Width:

    5 mm

LTC3857EUH#PBF Frequently Asked Questions (FAQs)

  • A good PCB layout for the LTC3857EUH involves keeping the input and output capacitors close to the device, using a solid ground plane, and minimizing the length of the traces between the device and the capacitors. Additionally, it's recommended to use a separate power plane for the input voltage and to keep the output voltage plane away from the input voltage plane.
  • The choice of input and output capacitors for the LTC3857EUH depends on the specific application requirements. In general, low-ESR capacitors with a high ripple current rating are recommended. For the input capacitor, a value of 10uF to 22uF is typical, while for the output capacitor, a value of 22uF to 47uF is typical. The capacitor voltage rating should be at least 1.5 times the maximum input voltage.
  • The maximum ambient temperature range for the LTC3857EUH is -40°C to 125°C. However, the device can operate up to 150°C with derating. It's recommended to check the thermal derating curves in the datasheet to ensure the device operates within its specified limits.
  • The switching frequency of the LTC3857EUH can be programmed using an external resistor connected between the RT pin and the GND pin. The recommended value of the resistor is between 1kΩ and 100kΩ, with a lower value resulting in a higher switching frequency. The datasheet provides a formula to calculate the switching frequency based on the resistor value.
  • The maximum output current capability of the LTC3857EUH is 7A. However, the device can deliver higher currents for short durations. It's recommended to check the thermal derating curves in the datasheet to ensure the device operates within its specified limits.

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LTC3857EUH#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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