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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 250MA 4-DFN
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：5.5V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.25V @ 250mA
- Current - Output：250mA
- Current - Quiescent (Iq)：25 µA
- Current - Supply (Max)：425 µA
- PSRR：80dB ~ 60dB (100Hz ~ 100KHz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature, Short Circuit, Soft Start
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：4-XDFN Exposed Pad
- Supplier Device Package：4-DFN (1x1)
- Grade：-
- Qualification：-
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Overview
The LDLN025PU33R is a fixed-output linear low-dropout regulator manufactured by STMicroelectronics. It provides a stable 3.3V output with a maximum continuous current of 250mA. The device operates within an input voltage range of 1.5V to 5.5V and features a typical dropout voltage of 160mV at full load. Key electrical specifications include a quiescent current of 425µA, power supply rejection ratio (PSRR) ranging from 80dB at 100Hz to 60dB at 100kHz, and an output noise level below 6.5µVRMS. It is housed in a compact 4-DFN package measuring 1x1mm.
Feature Summary
- Ultra-low output noise performance suitable for precision analog loads
- High power supply rejection ratio for noise-sensitive applications
- Integrated protection mechanisms including overcurrent, thermal shutdown, and soft-start
Applications
- Powering precision analog-to-digital converters (ADCs)
- Supplying voltage control oscillators (VCOs)
- Biasing sensors in space-constrained portable devices
Procurement Notes
Verify the specific suffix 'PU' against the manufacturer's official datasheet to confirm the exact output voltage tolerance and package variant. Ensure the ordering part number matches the required tape-and-reel or cut-tape configuration. Cross-reference the component marking code with the latest production documentation to avoid counterfeit parts.
Selection Notes
Select this component when designing circuits requiring high PSRR and minimal output noise for sensitive signal chains. It is appropriate for battery-powered systems where input voltages vary between 1.5V and 5.5V. Consider the 425µA quiescent current for standby power budgets and verify that the 250mA output capability meets the peak load requirements of the target application.
Part Context
This component belongs to the LDLN025 series of ultra-low-noise LDO regulators designed for noise-sensitive loads. The series offers various fixed output voltages while maintaining consistent electrical characteristics. It is intended for use in smartphones, smartwatches, fitness monitors, medical sensors, and wireless IoT devices where small footprint and clean power are critical.
Replacement Considerations
Direct substitutes within the same family include LDLN025PU12R, LDLN025PU18R, and LDLN025PU25R, which share identical pinouts and electrical profiles but provide different fixed output voltages.
