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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)：6V
- Voltage - Output (Min/Fixed)：1.8V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：-
- Current - Output：150mA
- Current - Quiescent (Iq)：150 µA
- Current - Supply (Max)：250 µA
- PSRR：60dB ~ 50dB (1kHz ~ 10kHz)
- 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 LD3985M18R is a fixed-output linear voltage regulator from STMicroelectronics, providing a stable 1.8V output with a maximum current capacity of 150mA. It operates within an input voltage range of 2.5V to 6V and features ultra-low dropout characteristics, typically 60mV at full load. The device incorporates logic-controlled electronic shutdown, reducing quiescent current to a maximum of 1.5µA in the OFF mode. It includes internal overcurrent and thermal protection mechanisms and maintains high power supply rejection ratios of 60dB at 1kHz. Designed for surface-mount assembly, it utilizes a SOT-23-5 package.
Feature Summary
- Ultra-low dropout voltage performance optimized for battery-powered systems
- Logic-controlled electronic shutdown function for standby power management
- Internal overcurrent and thermal limit protection circuits
- Low output noise voltage suitable for sensitive analog applications
Applications
- Mobile phones and similar battery-powered wireless systems
- Portable information appliances
- Low power applications requiring extended battery life
Procurement Notes
Verify the specific suffix 'M18R' corresponds to the 1.8V fixed output and SOT-23-5 packaging configuration. Confirm RoHS compliance status and moisture sensitivity level requirements for your manufacturing process. Ensure input voltage remains within the 2.5V to 6V operational range to maintain regulation stability.
Selection Notes
Select this component when a fixed 1.8V rail is required with minimal footprint using the SOT-23-5 package. It is appropriate for designs prioritizing low quiescent current and shutdown capabilities. Consider the 150mA output limit and ensure the application load does not exceed this rating under all operating conditions.
Part Context
This part belongs to the LD3985 series of BiCMOS voltage regulators designed for low noise and low dropout applications. The series supports various fixed output voltages and packages, including the LDS3985 variant which offers higher current capability. The LD3985M18R specifically targets portable electronics where power efficiency and small form factor are critical design constraints.
Replacement Considerations
The LDS3985 series offers alternative pin-compatible options with higher current ratings up to 300mA. Verify if the increased current capacity or different package types such as DFN are acceptable for the existing board layout and thermal requirements.
