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Product Detailed Parameters
- Description：IC REG LINEAR 3.1V 150MA SOT23-5
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：16V
- Voltage - Output (Min/Fixed)：3.1V
- 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 LD2985BM31R is a fixed-output low dropout linear voltage regulator manufactured by STMicroelectronics, providing a stable 3.1 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 operation across a temperature range of -40 °C to +125 °C.
Feature Summary
- Logic-controlled electronic shutdown for standby power management
- Ultra-low dropout voltage characteristics for battery efficiency
- Low output noise performance suitable for sensitive circuits
- Integrated internal current and thermal protection mechanisms
Applications
- Cellular phones
- Palmtop laptop computers
- Personal digital assistants (PDA)
- Camcorders and cameras
Procurement Notes
Verify the specific suffix 'BM31R' against official STMicroelectronics documentation to confirm the exact 3.1 V output voltage variant. Ensure compatibility with the required SOT-23-5L footprint and check for RoHS compliance status in the latest datasheet before finalizing procurement specifications.
Selection Notes
Select this component when a precise 3.1 V rail is required for low-power portable electronics. Consider its ultra-low quiescent current and shutdown capability for applications demanding extended battery life. Verify that the 150 mA output capacity meets the peak load requirements of the target circuit design.
Part Context
This part belongs to the LD2985 family of very low drop and low noise voltage regulators. The series offers multiple fixed output voltages including 1.8 V, 2.5 V, 2.8 V, 3.0 V, 3.1 V, 3.3 V, and 5.0 V. All variants share common features such as the SOT-23-5L package, inhibit functionality, and similar electrical characteristics optimized for mobile and handheld devices.
Replacement Considerations
Compatible substitutes within the same family include LD2985BM18R, LD2985BM25R, LD2985BM28R, LD2985BM30R, LD2985BM33R, and LD2985BM50R, depending on the required output voltage level.
