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Product Detailed Parameters
- Description：IC REG LINEAR 4V 50MA 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)：4V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.225V @ 50mA
- Current - Output：50mA
- Current - Quiescent (Iq)：150 µA
- Current - Supply (Max)：1.2 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 LD2982BM40R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 1.8 V output with a maximum load current of 50 mA. The device features a very low dropout voltage of 120 mV at full load and an output noise of 30 µVRMS. It includes an inhibit function for power control and is compatible with low ESR capacitors. The component is housed in a compact SOT-23-5 package, ensuring efficient space utilization in portable electronic designs.
Feature Summary
- Fixed 1.8 V output voltage with 50 mA current capability
- Very low dropout voltage (120 mV at 50 mA)
- Low output noise (30 µVRMS)
- Integrated inhibit function for power management
Applications
- Portable battery-powered devices
- RF circuits requiring low noise
- Embedded systems with tight voltage tolerances
- Mobile communication equipment
Procurement Notes
Verify the exact suffix '40R' to confirm the 1.8 V output variant and tape-and-reel packaging. Ensure compatibility with low ESR output capacitors as specified in the datasheet. Confirm RoHS compliance status if required by your manufacturing standards. Cross-reference the SOT-23-5 pinout with your PCB layout to prevent installation errors.
Selection Notes
Select this regulator when a fixed 1.8 V supply is needed with minimal voltage drop under 50 mA load. Consider its low noise characteristic for sensitive analog or RF sections. Verify that the input voltage remains within the specified range relative to the 1.8 V output. Check thermal dissipation requirements based on the expected voltage differential and load current in the final application.
Part Context
This component belongs to the LD2982 series of low-dropout regulators from STMicroelectronics. The series offers various fixed output voltages and packages. The LD2982BM40R specifically denotes the 1.8 V version in the SOT-23-5 package. It shares core architectural features with other variants in the family but differs in output voltage and physical packaging dimensions.
Replacement Considerations
Check for direct pin-to-pin replacements with identical 1.8 V output and 50 mA rating in SOT-23-5 packages. Verify equivalent dropout voltage and noise specifications. Ensure the substitute part supports the inhibit function if used in the design. Confirm availability and longevity commitments from alternative manufacturers.
