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Product Detailed Parameters
- Description：IC REG LINEAR 1.8V 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)：1.8V
- 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 LDL1117S18R is a positive fixed-output low dropout linear voltage regulator manufactured by STMicroelectronics. It provides a guaranteed output current of 1.2 A with an input voltage range from 2.5 V to 18 V. The device features a typical dropout voltage of 350 mV at full load and offers high power supply rejection ratio (PSRR) of 87 dB at 120 Hz. It includes internal thermal, current, and power limitation protections. The component operates within a junction temperature range of -40 °C to 125 °C and is housed in a SOT-223 surface-mount package.
Feature Summary
- Provides stable 1.2 A output current capability for demanding power applications
- Features high power supply rejection ratio suitable for noise-sensitive circuits
- Incorporates comprehensive protection mechanisms including overcurrent and thermal shutdown
Applications
- Direct regulation in switch-mode power supply (SMPS) systems
- Secondary linear regulation in DC-DC converter architectures
- Portable equipment requiring efficient voltage step-down
Procurement Notes
Verify the specific suffix 'R' corresponds to the reel packaging configuration when sourcing. Confirm the fixed 1.8 V output voltage matches the design requirement, as the base series supports multiple voltages. Ensure the SOT-223 footprint aligns with the PCB layout specifications before finalizing procurement.
Selection Notes
Select this component when a fixed 1.8 V rail is required with up to 1.2 A load current. The high PSRR makes it appropriate for filtering noise from upstream switching regulators. Consider the thermal dissipation capabilities inherent to the SOT-223 package under maximum load conditions to ensure reliable operation within the specified temperature range.
Part Context
This part belongs to the LDL1117 family of low dropout linear regulators. The family is characterized by high current capability and robust protection features. The LDL1117S18R specifically denotes the 1.8 V fixed output variant packaged in SOT-223, designed for surface-mount assembly in compact electronic designs.
Replacement Considerations
Compatible substitutes include other LDO regulators offering similar 1.2 A output and 1.8 V fixed voltage. Verify pinout compatibility and thermal performance characteristics when replacing. Ensure the alternative device meets the same input voltage range and protection feature requirements.
