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UC2845D8 - Texas Instruments

Description: Texas Instruments UC2845D8, PWM Current Mode Controller, 1 A, 500 kHz 8-Pin SOIC

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UC2845D8 - Texas Instruments - PCB symbol
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PCB Footprints
UC2845D8 - Texas Instruments PCB footprint - Small Outline Packages - Small Outline Packages - D0008A height 1.75
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UC2845D8 - Texas Instruments - 3D model - Small Outline Packages - D0008A height 1.75
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UC2845D8 Details

  • Manufacturer Part Number:

    UC2845D8

  • Brand Name:

    Texas Instruments

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Obsolete

  • Country Of Origin:

    Mexico

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.60

  • Manufacturer:

    Texas Instruments

  • YTEOL:

    0

  • Analog IC - Other Type:

    SWITCHING CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    28 V

  • Input Voltage-Min:

    7.6 V

  • Input Voltage-Nom:

    15 V

  • JESD-30 Code:

    R-PDSO-G8

  • JESD-609 Code:

    e4

  • Length:

    4.9 mm

  • Moisture Sensitivity Level:

    1

  • Number of Functions:

    1

  • Number of Outputs:

    1

  • Number of Terminals:

    8

  • Operating Temperature-Max:

    85 °C

  • Operating Temperature-Min:

    -40 °C

  • Output Current-Max:

    1 A

  • Output Voltage-Max:

    80 V

  • Output Voltage-Nom:

    5 V

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    SOP

  • Package Equivalence Code:

    SOP8,.25

  • Package Shape:

    RECTANGULAR

  • Package Style:

    SMALL OUTLINE

  • Peak Reflow Temperature (Cel):

    260

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    1.75 mm

  • Supply Current-Max (Isup):

    25 mA

  • Supply Voltage-Max (Vsup):

    28 V

  • Supply Voltage-Min (Vsup):

    8.4 V

  • Surface Mount:

    YES

  • Switcher Configuration:

    BUCK-BOOST

  • Switching Frequency-Max:

    500 kHz

  • Technology:

    BICMOS

  • Temperature Grade:

    INDUSTRIAL

  • Terminal Finish:

    Nickel/Palladium/Gold (Ni/Pd/Au)

  • Terminal Form:

    GULL WING

  • Terminal Pitch:

    1.27 mm

  • Terminal Position:

    DUAL

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

    30

  • Width:

    3.9 mm

UC2845D8 Frequently Asked Questions (FAQs)

  • The recommended input capacitor value is 1uF to 10uF, depending on the input voltage and output current requirements. A larger capacitor value can help reduce input voltage ripple and improve overall system stability.
  • The output inductor value depends on the output voltage, output current, and switching frequency. A general rule of thumb is to choose an inductor value that results in a peak-to-peak ripple current of 20-30% of the maximum output current. TI provides an inductor selection guide in the datasheet to help with this process.
  • The bootstrap capacitor (CBOOT) is used to generate the high-side gate drive voltage for the power MOSFET. It is charged through the internal bootstrap diode (DBOOT) and provides the necessary voltage to turn on the high-side MOSFET.
  • The switching frequency of the UC2845D8 can be adjusted by changing the value of the resistor connected to the RT pin. A smaller resistor value increases the switching frequency, while a larger resistor value decreases it. However, be careful not to exceed the maximum recommended switching frequency to avoid increased losses and EMI.
  • The maximum output current capability of the UC2845D8 depends on the input voltage, output voltage, and thermal design of the system. The datasheet provides a graph showing the maximum output current vs. input voltage. As a general rule, the UC2845D8 can deliver up to 4A of output current with proper thermal design and heat sinking.

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UC2845D8 Overview

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About Texas Instruments

Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.

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