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Product Detailed Parameters
- Description：IC REG LINEAR 2.1V 150MA 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)：2.1V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：-
- Current - Output：150mA
- Current - Quiescent (Iq)：250 µA
- Current - Supply (Max)：-
- PSRR：55dB (400Hz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-30°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 LK112M21TR is a positive fixed linear voltage regulator from STMicroelectronics, providing a 2.1V output at up to 150mA. It features a maximum input voltage of 14V and a typical dropout voltage of 0.35V at full load. The device includes an enable control feature and offers protection against overcurrent and thermal overload. With a quiescent current of 250µA and 55dB PSRR at 400Hz, it operates within a temperature range of -30°C to 125°C in a SOT-23-5 package.
Feature Summary
- Integrated electronic switch controllable by TTL or CMOS logic levels
- Low noise and low dropout voltage characteristics for stable regulation
- Built-in thermal and current protection mechanisms
Applications
- Battery-powered portable devices requiring efficient power management
- Embedded systems utilizing low-voltage digital logic
- Noise-sensitive analog circuits needing clean power supplies
Procurement Notes
Verify the specific suffix M21 confirms the 2.1V fixed output voltage. Ensure the TR suffix matches the required tape-and-reel packaging format. Confirm RoHS3 compliance status if environmental regulations apply to your assembly process. Cross-reference the SOT-23-5 footprint with your PCB design guidelines.
Selection Notes
Select this component when a precise 2.1V rail is needed with minimal external components. Consider the 150mA limit for load requirements. Evaluate the 250µA quiescent current impact on battery life. Verify input voltage stays below 14V to prevent damage.
Part Context
Part of the LK112 family of low-dropout linear regulators. Shares common features like enable control and protection circuits across variants. Differs primarily in fixed output voltage settings. Designed for compact surface-mount applications.
Replacement Considerations
Check datasheets for other LK112 variants with different output voltages. Verify pin compatibility with alternative LDO regulators offering similar current ratings and package types.
FAQ
How is the internal switch controlled?
The internal electronic switch can be controlled directly by TTL or CMOS logic signals via the enable pin.
What is the thermal resistance characteristic?
The ground pin is internally connected to the die attach flag to decrease total thermal resistance and improve power dissipation capability.
