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    AMS1117-3.3 Low Dropout Linear Regulator Detailed Explanation

    AMS1117-3.3
    Part No.:
    AMS1117-3.3
    Manufacturer:
    UMW
    Package:
    TO-261-4, TO-261AA
    Description:
    IC LDO REG 3.3V 1A SOT223
    Quantity:
    Payment:
    Payment
    Shipping:
    Shipping

    Article Details

    • Details
    • Specifications
    • Comparison

    The AMS1117-3.3 is a popular voltage regulator used to convert higher input voltages (typically from 4.5V to 15V) down to a stable 3.3V output. It's widely used in electronics projects, especially with microcontrollers and modules that require 3.3V logic.

    FEATURESw 

    1. The output accuracy of fixed versions 1.2V, 1.5V, 1.8V,2.5V, 3.3V, and 5.0V is 2%, and the output accuracy ofadjustable versions is 1.5%w

    2. Adjustable output voltagew

    3. Low Dropout Voltage: Typical 1.2V@1Aw

    4. Current Limitingw

    5. Thermal Shutdownw

    6. Temperature Range: -40℃ to 125

    Application

    1. Laptop, Palmtop, and Notebook ComputersProvides a stable 3.3V output for motherboard chips, I/O controllers, memory interfaces, etc.

    Advantages:

    Low dropout voltage is suitable for converting multiple internal power rails.

    Compact package supports high-density board design.

    Stable voltage output enhances overall system reliability.

    2. Battery ChargerSupplies 3.3V to control chips, status indicators, or communication interfaces.

    Advantages:

    Can be used with lithium or NiMH charging modules to provide a low-noise logic voltage.

    Built-in thermal and current limit protections improve safety.

    3. SCSI-II Active TerminatorProvides a stable termination voltage in SCSI-II interfaces to prevent signal reflection and interference.

    Advantages:

    AMS1117-3.3 delivers precise 3.3V output, compliant with SCSI termination voltage requirements.

    Simplifies layout and is suitable for end-point circuit boards.

    4. Cellular PhonePowers internal chips such as RF modules and baseband processors.

    Advantages:

    Small package fits embedded systems.

    Stable 3.3V output improves communication reliability.

    5. Cordless TelephonesPowers voice processing ICs, communication modules, or LCDs.

    Advantages:

    Low quiescent current is ideal for long standby devices.

    Stable output helps maintain clear voice signal transmission.

    6. Battery Powered SystemsConverts battery voltage (e.g., 5V or 7.4V lithium) to a regulated 3.3V for low-voltage components.

    Advantages:

    LDO design maintains output even as battery voltage drops.

    High efficiency suitable for portable electronics.

    7. Portable InstrumentationUsed in handheld oscilloscopes, sensor devices, testing tools that require precise 3.3V power.

    Advantages:

    Low noise performance fits high-accuracy measurement instruments.

    Thermal protection prevents damage under harsh conditions.

    8. SMPS Post-RegulatorUsed after a switching power supply to further regulate and filter the 3.3V output, reducing ripple and noise.

    Advantages:

    Combines switching power supply efficiency with LDO low-noise benefits.

    Ideal for analog or RF circuits sensitive to power noise.

    ABSOLUTE MAXIMUM RATINGS

     

    Advantages and Precautions

    Advantages:

    Simple to use, minimal external components.

    Stable and accurate 3.3V output.

    Integrated safety features (thermal and current protection).

    Low cost and widely available.

    Precautions:

    Heat Dissipation: When output current is high and input voltage is much greater than 3.3V, significant power is dissipated as heat (P = (Vin - 3.3V) × I). Heatsinks or large copper areas may be required.

    Dropout Consideration: Input voltage must be at least 1.1V above the output voltage to regulate properly.

    Output Capacitor Required: Without an output capacitor, the regulator may become unstable or oscillate.

    Product attributes
    Attribute value
    Manufacturer:
    UMW
    Series:
    -
    Package/Case:
    TO-261-4, TO-261AA
    Packaging:
    Cut Tape (CT)
    Product Status:
    Active
    Resistance:
    Positive
    Tolerance:
    Fixed
    Power (Watts):
    1
    Composition:
    12V
    Features:
    3.3V
    Temperature Coefficient:
    -
    Operating Temperature:
    1.3V @ 1A
    Supplier Device Package:
    1A
    Ratings:
    10 mA
    Size / Dimension:
    -
    Height - Seated (Max):
    75dB (120Hz)
    Number of Terminations:
    Current Limit
    Failure Rate:
    Over Temperature
    Image AMS1117-1.2 AMS1117CD-ADJ AMS1117-3.3 AMS1117CD-3.3 AMS1117CD-5.0
    Part Number AMS1117-1.2 AMS1117CD-ADJ AMS1117-3.3 AMS1117CD-3.3 AMS1117CD-5.0
    Manufacturer UMW UMW UMW UMW UMW
    Series - - - - -
    Package/Case TO-261-4, TO-261AA TO-252-3, DPAK (2 Leads + Tab), SC-63 TO-261-4, TO-261AA TO-252-3, DPAK (2 Leads + Tab), SC-63 TO-252-3, DPAK (2 Leads + Tab), SC-63
    Packaging Cut Tape (CT) Tape & Reel (TR) Cut Tape (CT) Cut Tape (CT) Cut Tape (CT)
    Product Status Active Active Active Active Active
    Output Configuration Positive Positive Positive Positive Positive
    Output Type Fixed Adjustable Fixed Fixed Fixed
    Number of Regulators 1 1 1 1 1
    Voltage - Input (Max) 12V 12V 12V 12V 12V
    Voltage - Output (Min/Fixed) 1.2V 1.25V 3.3V 3.3V 5V
    Voltage - Output (Max) - 10.8V - - -
    Voltage Dropout (Max) 1.3V @ 1A 1.3V @ 1A 1.3V @ 1A 1.3V @ 1A 1.3V @ 1A
    Current - Output 1A 1A 1A 1A 1A
    Current - Quiescent (Iq) 10 mA 10 mA 10 mA 10 mA 10 mA
    Current - Supply (Max) - - - - -
    PSRR 75dB (120Hz) 75dB (120Hz) 75dB (120Hz) 75dB (120Hz) 75dB (120Hz)
    Control Features Current Limit Current Limit Current Limit Current Limit Current Limit
    Protection Features Over Temperature Over Temperature Over Temperature Over Temperature Over Temperature
    Operating Temperature -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ)
    Grade - - - - -
    Qualification - - - - -
    Mounting Type Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
    Supplier Device Package SOT-223-3L TO-252 (DPAK) SOT-223-3L TO-252 (DPAK) TO-252 (DPAK)

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