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Product Detailed Parameters
- Description：IC REG LINEAR 5.5V 200MA SOT23-5
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：14V
- Voltage - Output (Min/Fixed)：5.5V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.5V @ 200mA
- Current - Output：200mA
- Current - Quiescent (Iq)：250 µA
- Current - Supply (Max)：-
- PSRR：55dB (400Hz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：SC-74A, SOT-753
- Supplier Device Package：SOT-23-5
- Grade：-
- Qualification：-
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Overview
The LK112SM55TR is a low-dropout linear regulator manufactured by STMicroelectronics, featuring a fixed 5.5V output and a maximum continuous current of 200mA. It operates within an input voltage range up to 14V and exhibits a maximum dropout voltage of 0.5V at full load. The device incorporates a shutdown function controllable via TTL or CMOS logic levels, with a quiescent current of 250µA. Power supply rejection ratio (PSRR) is specified at 55dB at 400Hz. Protection features include overcurrent and thermal overload safeguards. It is housed in a compact SOT-23-5 package suitable for surface-mount applications.
Feature Summary
- Integrated shutdown control compatible with standard TTL and CMOS logic levels
- Low noise operation with high power supply rejection ratio
- Built-in thermal and overcurrent protection mechanisms
Applications
- Battery-powered portable electronic devices requiring efficient power management
- Embedded systems utilizing microcontrollers needing stable 5.5V logic rails
- Industrial control modules requiring isolated or regulated low-noise power supplies
Procurement Notes
Verify the specific suffix 'M55' confirms the 5.5V output variant during procurement. Ensure compatibility with SOT-23-5 footprint requirements. Confirm RoHS compliance status if required by project specifications. Cross-reference datasheet revision dates to ensure feature consistency regarding shutdown threshold voltages.
Selection Notes
Select this component when a precise 5.5V regulation is required with minimal quiescent current consumption. Consider the 200mA output limit against peak load demands. Evaluate the SOT-23-5 package size constraints against available PCB real estate. Verify that the 14V maximum input voltage aligns with the system's supply rail capabilities.
Part Context
This part belongs to the LK112 series of low-dropout regulators from STMicroelectronics. The series offers various fixed output voltages and current ratings. The LK112SM55TR specifically targets applications needing a 5.5V rail with integrated shutdown capabilities, distinguishing it from non-shutdown variants within the same family.
Replacement Considerations
Direct substitutes include other LK112 series variants with different output voltages if voltage adjustment is feasible. Check for equivalent SOT-23-5 packaged LDOs from other manufacturers offering similar 200mA output and shutdown functionality.
