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Product Detailed Parameters
- Description：IC REG LINEAR 2.7V 150MA SOT23-5
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：6V
- Voltage - Output (Min/Fixed)：2.7V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.1V @ 150mA
- Current - Output：150mA
- Current - Quiescent (Iq)：150 µA
- Current - Supply (Max)：250 µA
- PSRR：60dB ~ 50dB (1kHz ~ 10kHz)
- 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 LD3985M27R is a BiCMOS ultra-low dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 2.7 V with a guaranteed maximum output current of 150 mA. The device operates from an input voltage range of 2.5 V to 6 V and features very low quiescent current, typically 85 µA at no load and 170 µA at full load. It includes logic-controlled electronic shutdown for power management and maintains stability with low ESR ceramic capacitors.
Feature Summary
- Ultra-low dropout voltage operation ensures high efficiency in battery-powered systems
- Logic-controlled electronic shutdown function allows local board standby modes
- Compatible with low ESR ceramic capacitors for stable performance
- Low output noise voltage suitable for sensitive analog circuits
Applications
- Mobile phones and similar battery-powered wireless systems
- Portable information appliances
- Low power applications requiring stable voltage regulation
Procurement Notes
Verify the specific suffix 'M27R' against official STMicroelectronics documentation to confirm the 2.7 V fixed output voltage and SOT-23-5 package configuration. Ensure compatibility with system requirements for input voltage range and thermal dissipation limits before procurement.
Selection Notes
Select this component for designs requiring a fixed 2.7 V rail with minimal quiescent current consumption. It is suitable for space-constrained applications due to its small SOT-23 package. Consider the 150 mA current limit when sizing for peak load demands.
Part Context
This part belongs to the LD3985 series of ultra-low dropout, low-noise BiCMOS voltage regulators. The series is characterized by its ability to operate with low ESR ceramic capacitors and its inclusion of a shutdown pin for enhanced power management in portable electronics.
Replacement Considerations
Direct substitutes within the same family include other LD3985 variants with different fixed output voltages (e.g., LD3985M33R for 3.3 V) if the voltage requirement can be adjusted. Verify pinout and package compatibility when considering cross-references.
