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Product Detailed Parameters
- Description：IC REG LINEAR 2.8V 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)：2.8V
- 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 LDLN025PU28R is a fixed-output low-dropout linear regulator from STMicroelectronics, providing a stable 2.8 V output with a maximum load current of 250 mA. It operates within an input voltage range of 1.5 V to 5.5 V and features ultra-low noise performance at 6.5 µVRMS. The device includes logic-controlled shutdown, internal soft-start, and thermal/overcurrent protection. It is housed in a compact SOT-23-5 package suitable for space-constrained designs.
Feature Summary
- Ultra-low noise operation suitable for sensitive RF and analog loads
- Logic-controlled electronic shutdown for extended battery life
- Internal soft-start limits inrush current during power-up
Applications
- Voltage regulation for precision ADCs in measurement systems
- Power supply for Voltage Controlled Oscillators (VCOs) in mobile devices
- Noise-sensitive circuits in wireless IoT and WLAN modules
Procurement Notes
Verify the complete part number against official STMicroelectronics documentation to ensure correct suffix alignment. Confirm that the 'PU' designation corresponds to the SOT-23-5 package and the '28R' indicates the specific 2.8 V fixed output voltage. Cross-reference with the latest datasheet revision to validate pinout compatibility and electrical specifications before procurement.
Selection Notes
Select this component when designing for ultra-low noise requirements in portable electronics. It is appropriate for applications requiring precise voltage regulation under varying load conditions while maintaining minimal quiescent current. Ensure the design accommodates the specified input voltage range and utilizes ceramic capacitors as required for stability.
Part Context
This component belongs to the LDLN025 series of 250 mA low-dropout regulators designed for noise-sensitive applications. The series offers various fixed output voltages and multiple small form-factor packages, including Flip-Chip and DFN options, to support diverse embedded system constraints.
Replacement Considerations
Consult the official LDLN025 family datasheet for verified alternative part numbers offering identical or compatible electrical characteristics and pin configurations.
