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Product Detailed Parameters
- Description：IC REG LINEAR POS ADJ SOT-223-3L
- Series：LD1117
- Mfr：UMW
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Adjustable
- Number of Regulators：1
- Voltage - Input (Max)：12V
- Voltage - Output (Min/Fixed)：1.25V
- Voltage - Output (Max)：10.7V
- Voltage Dropout (Max)：1.3V @ 1A
- Current - Output：-
- 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-ADJ is a positive low dropout regulator providing an adjustable output voltage with a reference voltage of 1.25V. It supports an output current up to 1A and operates within an input voltage range of 3V to 12V. The device features a typical dropout voltage of 1.2V at full load, line regulation of 9mV, and load regulation of 10mV. Quiescent current is typically 5mA, and ripple rejection reaches 75dB at 120Hz. It includes thermal shutdown at 150°C and current limiting up to 2.5A.
Feature Summary
- Adjustable output voltage configuration
- Integrated thermal shutdown protection
- Internal current limiting circuitry
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 datasheet lists multiple physical options for this part number. Confirm lead-free compliance status if environmental regulations apply to your manufacturing process. Ensure the supplier provides the official UTD Semiconductor datasheet for accurate pinout and electrical parameter validation before finalizing procurement.
Selection Notes
Select this component when an adjustable positive voltage rail is needed with high efficiency due to NPN pass transistor architecture. It is suitable for applications requiring tight output voltage tolerance of less than 1.5%. Consider the thermal resistance characteristics of the chosen package (e.g., 88°C/W for SOT-223) to ensure adequate heat dissipation under maximum load conditions without triggering thermal shutdown.
Part Context
This component belongs to the LD1117 series of low dropout regulators manufactured by UMT/UMW. The series includes both fixed voltage versions (1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5.0V) and the adjustable version. The family is designed for general-purpose power management in portable and battery-powered systems, offering space-saving surface mount packages alongside through-hole options.
Replacement Considerations
Compatible alternatives include the STMicroelectronics LD1117DTTR and UTC LD1117L-ADJ-SO8-D-R. Verify pin compatibility and thermal performance specifications when substituting.
