FAN2508S285X

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

The FAN2508S285X is a micropower low-dropout voltage regulator from the FAN2508/09 family, manufactured using CMOS technology. It provides a fixed output voltage of 2.85V with a maximum dropout voltage of 75mV at 50mA load current. The device features a ground current of 25µA at 50mA and supports a peak current of 300mA. It includes an Enable/Shutdown control pin that reduces supply current to less than 1µA when disabled. The component is housed in a compact SOT23-5 surface-mount package and incorporates onboard thermal limiting protection.

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

• Utilizes CMOS technology for ultra-low power consumption and cost-effective performance in portable devices.
• Features extremely low dropout voltage and high tolerance for a wide variety of external output capacitors due to loop stability design.
• Includes onboard thermal limiting protection that shuts down the output if die temperature exceeds specified maximums.
• Provides user-controllable Enable/Shutdown functionality to minimize quiescent current during inactive periods.

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

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

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

Verify the specific part number suffix against official manufacturer documentation to confirm the fixed output voltage and pin configuration. Ensure compatibility with the required SOT23-5 footprint and thermal management requirements on the printed circuit board. Confirm that the application environment stays within the recommended operating junction temperature range of -40°C to +125°C for guaranteed performance.

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

Select this component for battery-powered applications requiring stable regulation with minimal quiescent current draw. The fixed 2.85V output makes it suitable for powering specific logic or RF circuits. Consider the thermal resistance characteristics of the PCB layout, as heat dissipation relies heavily on copper area. Verify that the input voltage remains within the 2.7V to 6.5V range under all operating conditions.

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

This device belongs to the FAN2508/09 family of 50mA CMOS LDO regulators designed by Fairchild Semiconductor (now onsemi). The family distinguishes models by Pin 4 function: ADJ for adjustable voltage, BYP for noise reduction in fixed versions, and ERR for fault indication. The FAN2508S285X specifically utilizes the BYP configuration for optimal noise performance at a fixed 2.85V output.

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

The datasheet notes the device is pin-compatible with many popular older BiCMOS designs. Specific substitute part numbers are not explicitly listed in the provided documentation; verify cross-reference data through official distributor channels or manufacturer substitution guides.