FAN2501S25X

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

The FAN2501S25X is a fixed-output 2.5V CMOS LDO regulator from the FAN2500/01 family, housed in a 5-pin SOT-23 package. It delivers up to 100mA output current with a maximum dropout voltage of 140mV at full load and features a typical ground current of 50µA. Pin 4 serves as an open-drain error flag (ERR) that indicates when the output voltage drops below 95% of nominal due to faults such as input dropout or thermal shutdown. The device operates within a 2.7V to 6.5V input range and includes thermal limiting protection.

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

• Integrated open-drain error flag on pin 4 signals fault conditions like low input voltage or overheating
• CMOS technology enables ultra-low power consumption and minimal ground current during operation
• Robust loop stability accommodates a wide variety of external capacitors without sensitivity to ESR
• Onboard thermal protection shuts down the output if die temperature exceeds specified limits

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 suffix '25X' confirms the 2.5V fixed output voltage and tape-and-reel packaging format. Confirm the ERR pin function aligns with system diagnostic requirements. Ensure the SOT-23-5 footprint matches the PCB layout constraints. Check for RoHS compliance status if required by assembly specifications.

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

Select this component when a fixed 2.5V rail is needed with fault monitoring capabilities. The error flag allows the host system to detect undervoltage events caused by battery depletion or overload. Consider the 100mA current limit and thermal resistance characteristics for power dissipation calculations in compact enclosures.

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

This part belongs to the FAN2500/01 micropower LDO family utilizing CMOS process technology. Unlike the adjustable FAN2500 variants, the FAN2501 series provides a dedicated error output pin instead of an adjust or bypass terminal. The family is designed for cost-effective performance in portable consumer electronics requiring stable regulation from single-cell batteries.

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

FAN2500S25X: Pin 4 is BYP instead of ERR; requires capacitor connection for noise reduction rather than providing fault signaling.