FAN1616AS18X

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The FAN1616AS18X is a fixed positive Low Dropout (LDO) linear regulator manufactured by onsemi, formerly Fairchild Semiconductor. It provides a fixed 1.8V output voltage with a maximum dropout voltage of 1.2V at full load. The device is housed in a 4-pin SOT-223 plastic package and supports an output current of 0.5A. It operates within a junction temperature range of -40°C to 125°C. Key electrical characteristics include a line regulation of 0.022%/V and a load regulation of 0.5%. The quiescent current is typically 4mA, and it offers ripple rejection of 60dB at 120Hz when using a 22μF tantalum output capacitor.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Designed for USB control power and motherboard applications requiring efficient voltage conversion
• Integrated thermal protection and current limiting for enhanced reliability under dynamic loads
• Optimized for low noise performance suitable for sensitive digital logic and memory modules

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• USB Hub power supply circuits
• SDRAM module voltage regulation
• General purpose 12V to 1.8V step-down conversion

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix '18' confirms the 1.8V fixed output variant, distinct from the adjustable ASX or other voltage versions like AS3.3. Confirm the manufacturer origin as onsemi or legacy Fairchild Semiconductor documentation. Ensure the SOT-223 package type matches the design footprint requirements. Check for lead-free compliance markings if RoHS standards are mandatory for the assembly process.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a stable 1.8V rail is required with minimal input-output differential voltage. It is suitable for applications where efficiency is critical but switching noise must be avoided. Compare against adjustable variants if system flexibility is needed, or higher current regulators if load demands exceed 0.5A. Consider the thermal dissipation capabilities of the SOT-223 package relative to the expected power loss in the specific enclosure.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the FAN1616 series of LDO regulators, which includes adjustable and fixed voltage options such as the FAN1616ASX and FAN1616AS3.3. The series is characterized by its bipolar construction and robust performance in consumer electronics. The FAN1616AS18X specifically targets the 1.8V logic level requirement common in older digital systems and memory interfaces.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

What is the maximum dropout voltage for the FAN1616AS18X?

The maximum dropout voltage is 1.2V when delivering the full 0.5A output current.

Does the FAN1616AS18X have adjustable output voltage?

No, the FAN1616AS18X is a fixed output regulator providing exactly 1.8V. The adjustable version is designated as FAN1616ASX.