FAN2505S26X

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

The FAN2505S26X is a fixed-output 2.6V micropower low-dropout (LDO) linear voltage regulator manufactured by onsemi using CMOS technology. It provides a maximum output current of 200 mA with an input voltage range of 2.7 V to 6.5 V. The device features a dropout voltage of 170 mV at 100 µA and 200 mV at 200 mA, along with a ground pin current of 75 µA at full load. It includes an Enable/Shutdown control pin that reduces supply current to less than 1 µA when disabled. Pin 4 serves as an open-drain Error flag output indicating if the output voltage drops below 95% of nominal due to faults such as thermal shutdown or overload.

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

• Features an open-drain Error flag output on Pin 4 to indicate fault conditions where the output voltage falls below 95% of the nominal value.
• Includes an Enable/Shutdown control function that allows the user to disable the regulator output, reducing quiescent current to less than 1 µA.
• Utilizes CMOS process technology to achieve ultra-low power consumption and extremely low dropout voltages under load.
• Provides onboard thermal limiting protection that shuts down the output if the junction temperature exceeds 150°C.

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 2.6V output voltage and the presence of the Error flag functionality on Pin 4. Ensure compatibility with the SOT-23-5 surface-mount package dimensions and thermal requirements for your printed circuit board layout. Confirm that the component meets the required operating temperature range of -40°C to +125°C for your intended application environment.

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

Select this component for battery-powered portable devices requiring stable regulation with minimal power loss. The wide tolerance for external capacitor ESR values simplifies design by allowing flexibility in capacitor selection. 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 operations or elevated ambient temperatures.

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

This device belongs to the FAN2504/FAN2505 family of 200 mA CMOS LDO regulators. Unlike the adjustable FAN2504 variants, the FAN2505 series fixes the output voltage and repurposes Pin 4 as an error diagnostic flag. This family is designed to replace older BiCMOS designs, offering improved performance in compact form factors while maintaining pin compatibility with many popular legacy regulators.

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

FAN2505S25X

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

What is the function of Pin 4 on the FAN2505S26X?

Pin 4 functions as an open-drain Error flag output. It indicates a fault condition by going LOW when the output voltage drops below 95% of the nominal rated voltage due to issues like input dropout, overheating, or overloading.

How does the Enable pin affect power consumption?

Applying a logic low voltage (0.8V or less) to the Enable pin disables the output and reduces the quiescent ground current to less than 1 µA, which is useful for conserving battery life in portable applications.