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Product Detailed Parameters
- Description：IC REG LINEAR 3V 1.2A SOT-223
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：18V
- Voltage - Output (Min/Fixed)：3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.6V @ 1.2A
- Current - Output：1.2A
- Current - Quiescent (Iq)：500 µA
- Current - Supply (Max)：-
- PSRR：87dB ~ 65dB (120Hz ~ 100kHz)
- Control Features：-
- Protection Features：Over Current, Over Temperature, Under Voltage Lockout (UVLO)
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-261-4, TO-261AA
- Supplier Device Package：SOT-223
- Grade：-
- Qualification：-
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Overview
The LDL1117S30R is a high PSRR low dropout linear voltage regulator from STMicroelectronics, providing a fixed output voltage of 3.0 V with a maximum current capability of 1.2 A. It operates within an input voltage range of 2.5 V to 18 V and features a typical dropout voltage of 350 mV at full load. The device offers a power supply rejection ratio of 87 dB at 120 Hz, ensuring stable performance in noisy environments. It includes internal protections for current limiting, safe operating area (SOA), and thermal shutdown, making it suitable for direct regulation in switch-mode power supplies.
Feature Summary
- Provides a fixed 3.0 V output with up to 1.2 A continuous current capability
- Features high power supply rejection ratio for effective noise filtering in switching applications
- Includes integrated thermal, current, and power limitation protections for enhanced reliability
Applications
- Direct regulation in switch-mode power supplies (SMPS)
- Secondary linear regulation in DC-DC converter circuits
- Noise-sensitive analog circuit power supplies
Procurement Notes
Verify the specific suffix 'S30R' against official datasheets to confirm the 3.0 V output voltage and reel packaging configuration. Ensure compatibility with SOT223 mounting requirements and check for RoHS compliance status as per the latest manufacturer documentation before procurement.
Selection Notes
Select this component when a fixed 3.0 V rail is required with high current capacity and superior line regulation. Consider its high PSRR for applications sensitive to input ripple, such as audio or RF stages powered by switching sources. Verify that the input voltage remains within the 2.5 V to 18 V range under all operating conditions.
Part Context
The LDL1117 series comprises adjustable and fixed-output low-dropout regulators designed for high-efficiency power management. The LDL1117S30R specifically delivers a regulated 3.0 V output, fitting into ST's portfolio of linear regulators aimed at reducing power consumption while maintaining stability in compact electronic designs.
Replacement Considerations
Consult official substitution lists for equivalent LDOs with matching 3.0 V output and 1.2 A current rating. Verify pinout compatibility and thermal performance characteristics before replacing the original component in existing designs.
