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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 LD2985BM18R is a fixed-output low-dropout linear regulator from STMicroelectronics, providing a stable 1.8 V output with a maximum load current of 150 mA. It features an ultra-low dropout voltage of 280 mV at full load and 7 mV at 1 mA. 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. Noise performance is enhanced by a bypass pin, achieving 30 μVrms with a 10 nF external capacitor. It operates within a temperature range of -40 °C to 125 °C.
Feature Summary
- Ultra-low dropout voltage for efficient battery-powered operation
- Logic-controlled electronic shutdown with minimal standby current
- Low output noise voltage suitable for sensitive analog 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 'BM18R' against official STMicroelectronics documentation to confirm the 1.8 V fixed output voltage and SOT23-5L package configuration. Ensure compatibility with required input voltage ranges and thermal management strategies for the target application environment before finalizing procurement.
Selection Notes
Select this component when a precise 1.8 V rail is required with minimal power loss under varying load conditions. The low quiescent current makes it ideal for portable devices where battery life is critical. Consider the need for external bypass capacitance to achieve specified noise levels and verify that the shutdown control logic aligns with system power management requirements.
Part Context
The LD2985 series belongs to STMicroelectronics' portfolio of very low drop and low noise voltage regulators designed for mobile and handheld electronics. This family emphasizes power efficiency through reduced dropout voltages and advanced shutdown capabilities, catering to applications demanding strict power consumption limits and clean power delivery for RF and baseband components.
Replacement Considerations
Official substitutes include other variants within the LD2985 family such as LD2985BM25R or LD2985BM33R, which share identical pinouts and functional characteristics but provide different fixed output voltages (2.5 V or 3.3 V respectively). Verify that the system design can accommodate the alternative voltage level.
