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Product Detailed Parameters
- Description：IC REG LIN 2.8V 250MA 4-FLIPCHIP
- 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)：0.2V @ 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-XFBGA, FCBGA
- Supplier Device Package：4-FlipChip
- Grade：-
- Qualification：-
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Overview
The LDLN025J28R is a low-dropout linear regulator from STMicroelectronics, designed for noise-sensitive applications. It delivers an output current up to 250 mA with an input voltage range of 1.5 V to 5.5 V. The device provides a fixed 2.8 V output with 2% accuracy across line, load, and temperature variations. Key electrical parameters include an ultra-low output noise of 6.5 µVRMS and high power supply rejection ratio (PSRR) of 80 dB at 100 Hz. Quiescent current is typically 12 µA at no-load, extending battery life in portable devices.
Feature Summary
- Ultra-low output noise suitable for precision analog circuits
- High power supply rejection ratio for clean power delivery
- Logic-controlled shutdown mode for minimal standby consumption
- Internal protections against short-circuit and thermal overload
Applications
- Powering precision ADCs in mobile phones and tablets
- Supplying VCOs in wireless LAN devices
- Providing stable voltage for sensors in fitness monitors
- Powering components in smart watches and medical sensors
Procurement Notes
Verify the specific suffix 'J28R' corresponds to the 2.8 V output voltage and SOT-23-5L package configuration. Confirm that the component meets the required operating temperature range of -40 °C to +125 °C for your application environment. Ensure compatibility with ceramic capacitors as specified by the manufacturer's stability requirements.
Selection Notes
Select this regulator when ultra-low noise performance is critical for sensitive loads such as RF or analog sections. Consider the 250 mA current capability and 1.5 V to 5.5 V input range for compatibility with single-cell lithium batteries. Evaluate the compact SOT-23-5L package size if space constraints are a primary design factor.
Part Context
This component belongs to the LDLN025 series of 250 mA ultra-low noise LDO regulators. The series is engineered for space-constrained products requiring high performance and low power consumption. Other variants in the family offer different fixed output voltages ranging from 1 V to 5 V with 50 mV steps, sharing similar noise and PSRR characteristics.
Replacement Considerations
Check for other LDLN025 variants with different output voltages if system requirements change. Verify pin-to-pin compatibility with alternative packages like DFN4-1x1 or Flip-Chip4 if layout modifications are permitted.
