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Product Detailed Parameters
- Description：IC REG LIN 4.7V 150MA TSOT-23-5
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：6V
- Voltage - Output (Min/Fixed)：4.7V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.1V @ 150mA
- 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：SOT-23-5 Thin, TSOT-23-5
- Supplier Device Package：TSOT-23-5
- Grade：-
- Qualification：-
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Overview
The LD3985G47R is a fixed-output linear voltage regulator from STMicroelectronics, providing a stable 4.7V output with a maximum load current of 550mA. It operates within an input voltage range of 2.5V to 6V and utilizes a TSOT-23 surface-mount package with five pins. The device features ultra-low dropout characteristics, low quiescent current of 0.17mA, and high power supply rejection ratios of 55dB at 1kHz and 50dB at 10kHz. Designed for battery-powered applications, it supports operation temperatures from -40°C to +125°C.
Feature Summary
- Ultra-low dropout voltage performance ensures efficient regulation even when the input voltage approaches the output level.
- Low quiescent current consumption extends battery life in portable and wireless systems.
- High power supply rejection ratio maintains stable output against input line noise variations.
- Compatible with low ESR ceramic capacitors for compact circuit design.
Applications
- Battery-powered mobile phones
- Wireless communication systems
- Portable consumer electronics
Procurement Notes
Verify the specific suffix 'G47R' corresponds to the 4.7V fixed output variant on official STMicroelectronics documentation. Confirm the TSOT-23-5 package dimensions match your PCB footprint requirements. Ensure the operating temperature range meets your system's environmental specifications before finalizing procurement.
Selection Notes
Select this component when a fixed 4.7V rail is required with moderate current capability up to 550mA. It is suitable for designs prioritizing low noise and extended battery life over high efficiency switching. Verify that the input voltage remains above the minimum threshold while accounting for dropout voltage under full load conditions.
Part Context
This part belongs to the LD3985 series of BiCMOS voltage regulators designed for low-power applications. The series offers various fixed output voltages and shares common features such as shutdown control and thermal protection. It serves as a key component in power management solutions for portable devices requiring stable voltage rails.
Replacement Considerations
Consult STMicroelectronics datasheets for direct pin-compatible alternatives within the LD3985 family offering different output voltages or current ratings. Verify electrical parameters and package compatibility before substituting with components from other manufacturers.
