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Product Detailed Parameters
- Description：IC REG LINEAR 4.7V 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)：4.7V
- 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 LD2985AM47R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics, providing a stable 4.7 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 package and supports operation across a temperature range of -40 °C to 125 °C.
Feature Summary
- Logic-controlled electronic shutdown for power management
- Ultra-low dropout voltage characteristics
- Low noise performance with external bypass capability
- Integrated thermal and current protection
Applications
- Cellular phones
- Palmtop laptop computers
- Personal digital assistants (PDA)
- Camcorders and cameras
Procurement Notes
Verify the specific suffix 'AM47R' against official STMicroelectronics documentation to confirm the exact output voltage rating and tape-and-reel packaging specifications. Ensure compatibility with the required PCB footprint for the SOT-23-5L package. Cross-reference the manufacturing date code and RoHS compliance status with the latest distributor data sheets prior to procurement.
Selection Notes
Select this component when a fixed 4.7 V supply is required for battery-powered portable electronics. It is suitable for designs needing low quiescent current and logic-controllable standby modes. Verify that the input voltage remains within the 2.5 V to 16 V range and that the thermal dissipation requirements fit the SOT-23-5L package constraints for the expected load current.
Part Context
The LD2985 series comprises ultra-low drop voltage regulators designed for low-noise, low-power applications. This family includes various fixed output voltages such as 1.8 V, 2.5 V, 3.3 V, and 5 V. The LD2985AM47R specifically provides a 4.7 V output, fitting into the broader portfolio of STMicroelectronics' LDO solutions for mobile and handheld devices.
Replacement Considerations
Direct substitutes include other LD2985 variants with different fixed output voltages if the voltage level can be adjusted externally or if a different rail is acceptable. Check for functional equivalents from other manufacturers offering similar 150 mA LDOs with inhibit functions and SOT-23-5L packages.
