FAN2501S26X

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

The FAN2501S26X is a micropower low-dropout voltage regulator from the FAN2500/01 family, manufactured by onsemi. It provides a fixed 2.6V output with a maximum continuous current of 100 mA and a peak current capability of 300 mA. The device operates within an input voltage range of 2.7 V to 6.5 V and features a dropout voltage of 100 mV at 100 mA load. Pin 4 serves as an open-drain error flag (ERR) indicating when the output drops below 95% of nominal. It utilizes CMOS technology for ultra-low power consumption, including a ground current of 25 µA at full load, and includes thermal limiting protection.

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

• Features an open-drain error flag output on pin 4 that signals fault conditions such as input dropout or overheating.
• Utilizes CMOS technology to achieve ultra-low power consumption and minimal ground current during operation.
• Incorporates onboard thermal limiting circuitry that automatically disables the output if junction temperature exceeds safe limits.

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

• Cellular phones and accessories
• Personal Digital Assistants (PDAs)
• Portable cameras and video recorders
• Laptop, notebook, and palmtop computers

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

Verify the specific suffix 'X' indicates tape and reel packaging configuration. Confirm the manufacturer origin, as the datasheet references Fairchild Semiconductor history prior to onsemi acquisition. Ensure the component meets RoHS compliance requirements for the intended application environment. Cross-reference the part number against current onsemi catalogs to confirm availability status and any potential obsolescence notices.

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

Select this component for portable applications requiring a stable 2.6V rail with strict power budget constraints. The integrated error flag allows system monitoring for undervoltage or thermal faults without external comparators. Suitable for designs needing high tolerance for various output capacitor types due to low ESR sensitivity. Ideal for space-constrained PCB layouts utilizing the compact SOT-23-5 package.

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

This regulator belongs to the FAN2500/01 family of micropower LDOs. Unlike the FAN2500 which offers adjustable voltage or bypass options, the FAN2501 variant specifically designates pin 4 as an error diagnostic flag. This distinguishes it from other fixed-voltage regulators in the series that may offer noise reduction bypass capabilities instead of fault signaling.

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

FAN2500S26X

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

What is the function of pin 4 on the FAN2501S26X?

Pin 4 functions as an open-drain Error Flag (ERR). It outputs a logic low signal when the output voltage drops below 95% of the nominal value due to faults such as input dropout, overheating, or overloading.

How does the device handle overload conditions?

The device incorporates thermal limiting protection. If the die temperature exceeds the shutdown limit, the internal circuit disables the output. The output remains suspended until the temperature drops below the limit, at which point it re-enables automatically.