FAN2501S28X

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

The FAN2501S28X is a fixed-output 2.8V CMOS LDO regulator from the FAN2500/01 family, housed in an SOT-23-5 package. It delivers up to 100mA output current with a maximum dropout voltage of 140mV at full load and 4mV at 100µA. The device features a typical ground current of 50µA at 100mA load and includes an ERR pin that signals when output voltage drops below 95% of nominal. It operates within a 2.7V to 6.5V input range, supports junction temperatures up to 125°C, and incorporates thermal shutdown protection triggered at 150°C.

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

• CMOS technology enables ultra-low power consumption and minimal ground current during operation.
• Integrated error flag (ERR) provides diagnostic indication of fault conditions such as low input voltage or overload.
• High tolerance for external capacitors allows stable loop performance across a wide range of ESR values.
• Onboard thermal limiting protects the device by disabling output when die temperature exceeds safe 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 component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix '28X' corresponds to the 2.8V fixed output variant with Error flag functionality. Ensure the ordering information matches the required SOT-23-5 package and tape/reel specifications for integration into manufacturing processes.

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

Select this component for battery-powered portable applications requiring precise 2.8V regulation with fault monitoring capabilities. The low dropout characteristic suits systems with narrow voltage margins between battery discharge levels and load requirements. The ERR pin facilitates system-level diagnostics for detecting undervoltage or thermal events without additional sensing circuitry.

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

Part of the FAN2500/01 micropower LDO family utilizing CMOS process technology. Distinguished from the FAN2500 series by Pin 4 function: FAN2501 uses an open-drain Error flag instead of Adjustable or Bypass inputs. Designed as a cost-effective replacement for older BiCMOS designs with improved stability and lower quiescent current profiles.

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

Pin-compatible with many popular legacy devices. Verify if the application requires the Error flag feature; if not, the FAN2500S28X may serve as an alternative. Ensure thermal management strategies account for the specified junction-to-ambient resistance characteristics in the final PCB layout.

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

What is the function of Pin 4 on the FAN2501S28X?

Pin 4 serves as an open-drain Error (ERR) flag output. It goes LOW when the output voltage drops below 95% of the nominal rated value due to faults such as input dropout, overheating, or overloading.

How does the device handle thermal overload conditions?

Internal thermal protection circuitry disables the output when the die temperature exceeds 150°C. The output remains suspended until the temperature drops below this limit, at which point it automatically re-enables.