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Product Detailed Parameters
- Description：IC REG LINEAR 2.9V 150MA SOT23-5
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：6V
- Voltage - Output (Min/Fixed)：2.9V
- 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 LD3985M29R is a BiCMOS ultra-low dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 2.9 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 is stable with low ESR ceramic capacitors. Key electrical characteristics include a typical quiescent current of 85 µA at no load and 170 µA at full load, with a shutdown mode current of 1.5 µA maximum. It features a very low dropout voltage of 60 mV at 150 mA and low output noise of 30 µV RMS over the 10 Hz to 100 kHz bandwidth.
Feature Summary
- Ultra-low dropout voltage performance for efficient battery-powered operation
- Logic-controlled electronic shutdown function for standby power management
- Stable with low ESR ceramic capacitors without requiring specific output capacitance values
- Integrated internal current and thermal limiting protection
Applications
- Mobile phones and similar battery-powered wireless systems
- Portable information appliances
- Low power applications requiring extended battery life
Procurement Notes
Verify the complete part number against official STMicroelectronics documentation to ensure correct output voltage (2.9 V) and package configuration. Confirm that the specific suffix matches the required tape-and-reel or tube packaging format. Cross-reference the manufacturing date code and automotive grade availability if applicable to your design requirements.
Selection Notes
Select this component when a fixed 2.9 V rail is needed with minimal voltage drop across the regulator. It is suitable for designs where low quiescent current is critical for battery longevity. Ensure the application utilizes low ESR ceramic output capacitors to maintain stability. Consider the LD3985M33R or other variants if different fixed output voltages are required.
Part Context
The LD3985 belongs to STMicroelectronics' family of ultra-low dropout, low-noise BiCMOS voltage regulators. This series is designed for portable electronics, offering high power supply rejection ratios and fast turn-on times. The M29 suffix specifically denotes the 2.9 V fixed output version within this product line.
Replacement Considerations
Direct substitutes include other LD3985 variants with different fixed output voltages, such as LD3985M33R (3.3 V) or LD3985M18R (1.8 V), provided the system voltage requirements allow for adjustment. Verify pin compatibility and thermal performance before substitution.
