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UC3844AD - Texas Instruments

Description: Texas Instruments UC3844AD, PWM Current Mode Controller, 1 A, 500 kHz 14-Pin SOIC

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UC3844AD Details

  • Manufacturer Part Number:

    UC3844AD

  • Brand Name:

    Texas Instruments

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    SOIC

  • Pin Count:

    14

  • Country Of Origin:

    Mexico

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.90

  • Manufacturer:

    Texas Instruments

  • YTEOL:

    15

  • Analog IC - Other Type:

    SWITCHING CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    28 V

  • Input Voltage-Min:

    11.5 V

  • Input Voltage-Nom:

    15 V

  • JESD-30 Code:

    R-PDSO-G14

  • JESD-609 Code:

    e4

  • Length:

    8.65 mm

  • Moisture Sensitivity Level:

    1

  • Number of Functions:

    1

  • Number of Terminals:

    14

  • Operating Temperature-Max:

    70 °C

  • Output Current-Max:

    1 A

  • Output Voltage-Max:

    5.1 V

  • Output Voltage-Min:

    4.9 V

  • Output Voltage-Nom:

    5 V

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    SOP

  • Package Equivalence Code:

    SOP14,.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):

    16 V

  • Supply Voltage-Nom (Vsup):

    11 V

  • Surface Mount:

    YES

  • Switcher Configuration:

    BUCK-BOOST

  • Switching Frequency-Max:

    500 kHz

  • Technology:

    BIPOLAR

  • Temperature Grade:

    COMMERCIAL

  • 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

UC3844AD Frequently Asked Questions (FAQs)

  • The maximum operating frequency of UC3844AD is 500 kHz. However, it's recommended to operate it at a frequency below 400 kHz for optimal performance and to minimize power losses.
  • The minimum input voltage for UC3844AD is 8.5V, and the maximum input voltage is 35V. You can calculate the minimum input voltage by considering the voltage drop across the internal regulator and the minimum voltage required for the oscillator to function properly.
  • The soft-start pin (SS) in UC3844AD is used to gradually increase the output voltage of the converter during startup, reducing the inrush current and preventing voltage overshoots. It's recommended to connect a capacitor between the SS pin and ground to set the soft-start time.
  • The oscillator frequency of UC3844AD depends on the specific application requirements. A higher frequency can provide better transient response, but it may increase power losses. A lower frequency can reduce power losses, but it may compromise transient response. Typically, a frequency between 100 kHz to 400 kHz is suitable for most applications.
  • The maximum output current of UC3844AD is 1A. However, the actual output current depends on the specific application, output voltage, and input voltage. It's recommended to check the datasheet and application notes for more information on output current capabilities.

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UC3844AD 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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