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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 1A SOT-223-3L
- Series：-
- Mfr：UMW
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：12V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.3V @ 1A
- Current - Output：1A
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：75dB (120Hz)
- Control Features：Current Limit
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-261-4, TO-261AA
- Supplier Device Package：SOT-223-3L
- Grade：-
- Qualification：-
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Overview
The UMW LD1117-3.3 is a positive low dropout linear regulator providing a fixed 3.3V output with a maximum current of 1A. It operates within an input voltage range up to 12V and features a typical dropout voltage of 1.2V at full load. The device offers high output accuracy, with a tolerance of less than 1.5% for the 3.3V version. Key electrical characteristics include a ripple rejection ratio of 75dB at 120Hz and a quiescent current of 5mA. It incorporates internal thermal shutdown and current limiting protection, ensuring reliable operation across a junction temperature range of -40°C to 125°C.
Feature Summary
- Provides fixed 3.3V output with less than 1.5% accuracy
- Features low dropout voltage performance of 1.2V at 1A
- Includes internal thermal shutdown and current limiting protection
Applications
- Laptop, Palmtop, and Notebook Computers
- Battery Charger
- SCSI-II Active Terminator
- Cellular Phone
- Cordless Telephones
Procurement Notes
Verify the specific package variant (SOT-223-3L, SOT-89-3L, or TO-252-2L) required for your design, as the LD1117 series is available in multiple form factors. Confirm that the supplier provides the official UMW datasheet to ensure compliance with the specified electrical parameters. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.
Selection Notes
Select this component when a stable 3.3V rail is needed from higher input voltages with moderate current demands up to 1A. Ensure the application circuit includes the recommended output capacitance, typically a 22µF tantalum capacitor, to maintain stability. Consider the thermal resistance of the chosen package relative to the expected power dissipation to prevent triggering the internal thermal shutdown during continuous operation.
Part Context
The LD1117 series by UMW belongs to the family of 1A positive LDO regulators designed for efficient power management in portable electronics. It utilizes an NPN pass transistor driven by a PNP, offering superior efficiency compared to traditional PNP-based designs. The series supports both fixed and adjustable output configurations, making it versatile for various voltage requirements in battery-powered systems.
Replacement Considerations
LD1117V33 (STMicroelectronics)
FAQ
What type of output capacitor is recommended for stability?
The datasheet recommends using a 22µF tantalum capacitor for the output to ensure device stability across all operating conditions.
How does the LD1117 protect against overload conditions?
The device includes internal thermal shutdown to protect against excessive junction temperatures and current limiting to safeguard against short circuits or overloads.
