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Product Detailed Parameters
- Description：IC REG LINEAR 2.8V 150MA SOT23-5
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：16V
- Voltage - Output (Min/Fixed)：2.8V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.575V @ 150mA
- Current - Output：150mA
- Current - Quiescent (Iq)：150 µA
- Current - Supply (Max)：4 mA
- PSRR：45dB (1kHz)
- 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 LD2985BM28R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics, providing a stable 2.8 V output with a maximum load current of 150 mA. It operates within an input voltage range of 2.5 V to 16 V and features a very low dropout voltage of 280 mV at full load. The device incorporates logic-controlled electronic shutdown via a TTL-compatible inhibit pin, reducing quiescent current to less than 1 μA in sleep mode. Internal protections include current limiting and thermal shutdown. It utilizes a compact SOT-23-5L surface-mount package and supports an operating temperature range from -40 °C to +125 °C.
Feature Summary
- Ultra-low dropout voltage performance for efficient battery-powered operation
- Logic-controlled electronic shutdown function with minimal standby power consumption
- Integrated internal current and thermal protection mechanisms
- Low noise output capability suitable for sensitive analog circuits
Applications
- Cellular phones
- Palmtop laptop computers
- Personal digital assistants (PDA)
- Camcorders and cameras
Procurement Notes
Verify the specific suffix 'BM28R' against official STMicroelectronics documentation to confirm the 2.8 V fixed output voltage variant. Ensure compatibility with the SOT-23-5L package dimensions and verify that the required 10 nF bypass capacitor is included in the design for optimal noise reduction specifications.
Selection Notes
Select this component when a precise 2.8 V rail is required with minimal voltage drop under high load conditions. Consider its low quiescent current and shutdown feature for systems requiring extended battery life. Evaluate the thermal dissipation capabilities within the small SOT-23-5L package relative to the expected ambient temperature and load current profile.
Part Context
This part belongs to the LD2985 family of ultra-low-dropout regulators designed for portable electronics. The series offers various fixed output voltages including 1.8 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V. All variants share common features such as low noise, high PSRR, and robust protection circuits, making them standard choices for powering microcontrollers and RF modules in mobile devices.
Replacement Considerations
Other LD2985 variants with different output voltages (e.g., LD2985BM30R for 3.0 V) are pin-compatible but provide different regulated outputs. Verify that the system can tolerate the voltage difference before substituting.
