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Product Detailed Parameters
- Description：IC REG LINEAR 1.8V 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)：1.8V
- 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 LD2985AM18R is a fixed-output low dropout linear voltage regulator manufactured by STMicroelectronics, providing a stable 1.8 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 an ultra-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 is housed in a compact SOT-23-5L package and supports an operating temperature range from -40 °C to +125 °C.
Feature Summary
- Ultra-low dropout voltage performance ensures efficient power regulation under varying load conditions.
- Logic-controlled electronic shutdown allows for precise board-level standby management.
- Low noise operation suitable for sensitive analog and RF circuits.
- Integrated thermal and current protection safeguards against overload scenarios.
Applications
- Cellular phones
- Palmtop laptop computers
- Personal digital assistants (PDA)
- Camcorders and cameras
Procurement Notes
Verify the specific suffix 'AM18R' corresponds to the 1.8 V fixed output variant and SOT-23-5L package. Confirm that the manufacturer's datasheet specifies the exact electrical characteristics for this marking code. Ensure compatibility with system input voltage requirements before procurement.
Selection Notes
Select this component when a stable 1.8 V rail is required for battery-powered portable electronics. It is appropriate for designs needing low quiescent current to extend battery life and logic-controllable shutdown capabilities. Verify that the 150 mA output current meets the peak demand of the target circuit.
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, 2.5, 2.8, 3, 3.1, 3.3, and 5 V. All variants share similar features such as low dropout voltage, low quiescent current, and internal protection mechanisms, packaged in SOT-23-5L.
Replacement Considerations
Direct substitutes within the same family include LD2985BM18R or LD2985CM18R, which offer identical functionality but may differ in manufacturing lot or specific tolerance grades. Cross-family replacements require verification of pinout compatibility and electrical parameter alignment.
