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Product Detailed Parameters
- Description：IC REG LINEAR 1.8V 100MA SOT23-5
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：16V
- Voltage - Output (Min/Fixed)：1.8V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.375V @ 100mA
- Current - Output：100mA
- Current - Quiescent (Iq)：150 µA
- Current - Supply (Max)：2.6 mA
- PSRR：63dB (1kHz)
- 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 LD2981ABM18TR is a fixed-output low-dropout (LDO) linear voltage regulator manufactured by STMicroelectronics. It provides a regulated output of 1.8 V with a maximum continuous load current of 100 mA. The device features an ultra-low quiescent current of 80 µA in active mode and less than 1 µA in shutdown mode, making it suitable for battery-powered applications. It includes logic-controlled electronic shutdown via the inhibit pin and offers internal thermal and current limiting protection. The component is housed in a compact SOT-23-5 surface-mount package.
Feature Summary
- Ultra-low dropout voltage operation enables efficient power management with minimal input-to-output differential.
- Logic-controlled shutdown function allows system standby modes to significantly reduce total power consumption.
- Integrated thermal and current limit protections ensure reliable operation under fault conditions.
Applications
- Battery-powered portable electronics
- Personal digital assistants (PDA)
- Cellular phones and mobile devices
Procurement Notes
Verify the specific suffix 'ABM' against official datasheets to confirm the 1.8V output voltage and ±0.75% tolerance accuracy. Ensure the SOT-23-5 package matches the design footprint. Confirm RoHS compliance status as per the latest manufacturer documentation before finalizing procurement specifications.
Selection Notes
Select this component when a stable 1.8V rail is required from higher input voltages with minimal quiescent current draw. The A-grade version ensures tighter output voltage tolerance compared to standard variants. Verify that the application load does not exceed the 100mA maximum rating and that the PCB layout supports the small form factor.
Part Context
This part belongs to the LD2981 family of ultra-low drop voltage regulators designed for low noise and low power applications. The series is characterized by fast dynamic response and compatibility with low ESR ceramic capacitors. It serves as a power management solution for portable consumer electronics requiring high efficiency and extended battery life.
Replacement Considerations
LD2981CM18TR: Same family member with potentially different output voltage tolerance specifications. LP2981-18DBVR: Texas Instruments equivalent offering similar performance metrics in a comparable SOT-23-5 package.
