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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 300MA 6-DFN
- 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)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.25V @ 300mA
- Current - Output：300mA
- Current - Quiescent (Iq)：150 µA
- Current - Supply (Max)：300 µA
- PSRR：55dB ~ 50dB (1kHz ~ 10kHz)
- Control Features：Shutdown
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：6-VDFN Exposed Pad
- Supplier Device Package：6-DFN (3x3)
- Grade：-
- Qualification：-
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Overview
The LDS3985PU33R is a fixed-output linear low-dropout (LDO) voltage regulator manufactured by STMicroelectronics. It provides a stable 3.3V output with a maximum load current of 300mA. The device operates within an input voltage range of 2.5V to 6V and features a typical dropout voltage of 0.25V at full load. It incorporates shutdown control functionality and includes protection against overcurrent and thermal overload. The component is housed in a compact 6-lead DFN package measuring 3mm x 3mm, suitable for surface-mount applications.
Feature Summary
- Integrated shutdown control for power management
- Built-in overcurrent and thermal overload protection
- Compact 6-lead DFN surface-mount packaging
Applications
- Portable battery-powered electronic devices
- Embedded systems requiring stable 3.3V logic supply
- Low-power consumer electronics circuits
Procurement Notes
Verify the specific suffix 'RY' or 'R' against the manufacturer's official datasheet to confirm exact shipping configuration and marking details. Ensure the ordering part number matches the required package variant and output tolerance specifications before procurement to avoid compatibility issues with the target design.
Selection Notes
Select this component when a fixed 3.3V rail is required with moderate current demands up to 300mA. The integrated shutdown feature makes it suitable for systems needing active power control. Verify that the input voltage remains within the 2.5V to 6V window and that the PCB layout supports the thermal requirements of the 6-DFN package for optimal performance.
Part Context
This part belongs to the LDS3985 series of ultra-low quiescent current LDO regulators from STMicroelectronics. The series is designed for portable applications where battery life is critical. The PU33R designation indicates a fixed 3.3V output version packaged in a 6-lead DFN format, distinguishing it from other pin counts or output voltages within the same family.
Replacement Considerations
Direct substitutes include other LDS3985 variants with different output voltages or packages, such as LDS3985M33R, provided the pinout and electrical characteristics align with the original design requirements.
