FAN2504S28X

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

The FAN2504S28X is a fixed-output 2.8V linear regulator from the FAN2504/05 family, manufactured by onsemi (formerly Fairchild Semiconductor). It utilizes CMOS technology to deliver a maximum output current of 200mA with an input voltage range of 2.7V to 6.5V. The device features a typical dropout voltage of 200mV at full load and a ground pin current of 75µA. It includes thermal limiting protection and an enable/shutdown control pin that reduces quiescent current to less than 1µA when disabled.

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

• Utilizes CMOS process technology for ultra-low power consumption and low shutdown current
• Features extremely low dropout voltage under load compared to older bipolar pass-transistor designs
• Includes onboard thermal protection circuitry that disables the output if die temperature exceeds 150°C
• Offers exceptional loop stability capable of accommodating a wide variety of external capacitors

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

• Cellular phones and accessories
• PDAs
• Portable cameras and video recorders
• Laptop, notebook and palmtop computers

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

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix '28X' corresponds to the 2.8V fixed output variant with BYP functionality on Pin 4. Ensure the SOT-23-5 package matches the required PCB footprint. Review the datasheet for absolute maximum ratings to prevent damage during handling and installation.

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

Select this component for battery-powered applications requiring stable regulation with minimal power drain. The fixed 2.8V output is suitable for powering digital logic or RF circuits. Consider the thermal resistance characteristics of the SOT-23-5 package and ensure adequate copper area on the PCB to manage heat dissipation during high-load conditions.

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

This part belongs to the FAN2504/05 family of micropower LDO regulators. The FAN2504 series distinguishes itself with Pin 4 configured as BYP for noise reduction in fixed-voltage models. This family offers significant improvements over older BiCMOS designs and is pin-compatible with many popular legacy devices, facilitating easier upgrades in existing portable electronic designs.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

FAN2504SX (Adjustable version)

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

What is the function of Pin 4 on the FAN2504S28X?

Pin 4 serves as the Bypass (BYP) input. Connecting a capacitor between this pin and ground allows for optimal noise performance at the output.

How does the device handle overload conditions?

The regulator includes thermal limiting protection. If the die temperature exceeds 150°C due to overload, the output shuts down until the temperature drops below the limit, at which point it re-enables.