FAN2509S27X

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

The FAN2509S27X is a fixed-output micropower low-dropout voltage regulator from the FAN2508/09 family, manufactured by onsemi. It provides a regulated 2.7 V output with a maximum continuous current of 50 mA and supports an input voltage range from 2.7 V to 6.5 V. The device utilizes CMOS technology to achieve a ground pin current of 25 µA at full load and features a dropout voltage of 50 mV at 50 mA. It includes thermal limiting protection and an open-drain error flag output that indicates when the output voltage drops below 95% of nominal.

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

• Features an open-drain Error Flag (ERR) output on Pin 4 to indicate fault conditions such as input dropout or overheating.
• Utilizes CMOS process technology for ultra-low power consumption and extremely low dropout voltage characteristics.
• Incorporates onboard thermal limiting circuitry that automatically disables the output if die temperature exceeds 150°C.
• Offers exceptional loop stability capable of accommodating a wide variety of external output capacitors.

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

• GSM and TDMA cellular handsets
• Laptop, notebook, and palmtop computers
• Portable cameras and video recorders
• Personal Digital Assistants (PDAs)

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

Verify the component manufacturer origin, as the datasheet originates from Fairchild Semiconductor while the model designation uses the onsemi prefix. Confirm the specific package marking code 'ABJ' matches the physical device received. Ensure the application environment respects the absolute maximum ratings regarding junction temperature and input voltage limits to prevent damage.

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

Select this component for battery-powered portable applications requiring precise 2.7 V regulation with minimal quiescent current draw. The inclusion of the ERR pin makes it suitable for systems needing diagnostic feedback on power integrity. Consider the SOT-23-5 footprint constraints and ensure adequate copper area on the PCB to manage thermal resistance during high-load operation.

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

This part belongs to the FAN2508/FAN2509 family of 50 mA CMOS LDO regulators. While the FAN2508 offers adjustable or bypassed outputs, the FAN2509 variant specifically integrates an error flag function. These devices are designed to replace older BiCMOS designs in compact mobile electronics, offering improved efficiency and stability across varying load and temperature conditions.

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

FAN2509S27X