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Product Detailed Parameters
- Description：IC REG LINEAR 1.5V 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)：1.5V
- 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：-
Download product information
Overview
The LDL1117S15R is a fixed-output linear voltage regulator from STMicroelectronics, providing a stable 1.5 V output 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 incorporates high power supply rejection ratio (PSRR) performance, reaching 87 dB at 120 Hz, which supports direct regulation in switch-mode power supplies. Integrated protections include thermal shutdown, current limiting, and safe operating area (SOA) protection. It is housed in a SOT-223 surface-mount package and rated for operation between -40 °C and 125 °C.
Feature Summary
- High PSRR suitable for noise-sensitive applications
- Integrated thermal and current protection
- Fixed 1.5 V output configuration
Applications
- Direct regulation in SMPS circuits
- Secondary linear regulation in DC-DC converters
- Portable electronic devices requiring low noise
Procurement Notes
Verify the specific suffix 'S15R' corresponds to the 1.5 V fixed output variant and SOT-223 packaging. Confirm RoHS compliance status and moisture sensitivity level requirements for your assembly process. Ensure the ordering code matches the exact manufacturer part number to avoid functional mismatches.
Selection Notes
Select this component when a stable 1.5 V rail is required with up to 1.2 A load current. Consider its high PSRR if the input source contains significant ripple or switching noise. Verify that the input voltage remains within the 2.5 V to 18 V range under all operating conditions.
Part Context
This part belongs to the LDL1117 family of low-dropout regulators designed for high-current applications. The family offers various fixed output voltages while maintaining consistent electrical characteristics and protection features across variants.
Replacement Considerations
Check for other LDL1117 variants with different output voltages if system requirements change. Verify pin compatibility with existing PCB layouts before substituting.
