FAN2508S27X

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

The FAN2508S27X is a fixed-output micropower low-dropout voltage regulator manufactured by onsemi. It provides a stable 2.7 V output with a maximum continuous current of 50 mA. The device operates within an input voltage range of 2.7 V to 6.5 V and features a typical dropout voltage of 50 mV at full load. It utilizes CMOS technology to achieve a ground pin current of 25 µA during operation, reducing to less than 1 µA in shutdown mode via the Enable pin. The component is housed in a compact SOT-23-5 surface-mount package.

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

• Fixed 2.7 V output utilizing Pin 4 as a Bypass terminal for noise reduction
• Ultra-low power consumption with 25 µA ground current at rated load
• Integrated thermal limiting protection against overheating
• Enable/Shutdown control allowing output disable to under 1 µA

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 that the specific part number matches the required fixed output voltage and package type. Confirm the manufacturer origin, as Fairchild Semiconductor products are now managed under the onsemi brand portfolio. Ensure compliance with RoHS standards if applicable to your manufacturing requirements. Review the datasheet for absolute maximum ratings to prevent damage during handling or circuit integration.

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

Select this component when a precise 2.7 V rail is required for battery-powered portable electronics. The SOT-23-5 package is suitable for space-constrained designs. Consider the bypass pin capability if minimizing output noise is critical for sensitive analog circuits. Verify that the system's input voltage remains within the specified operating range to ensure proper regulation and stability.

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

This device belongs to the FAN2508/FAN2509 family of 50 mA CMOS LDO regulators. The 'S' suffix indicates the SOT-23-5 package, while '27' specifies the fixed 2.7 V output voltage. The 'X' denotes tape and reel packaging. This family offers improvements over older BiCMOS designs, providing better loop stability and lower power consumption for mobile applications.

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

FAN2508S27 (underscore variant)

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

What is the function of Pin 4 on the FAN2508S27X?

Pin 4 serves as a Bypass input. Connecting a capacitor between this pin and ground optimizes noise performance.

How does the device handle overload conditions?

The regulator includes onboard thermal protection that shuts down the output if the die temperature exceeds 150°C. The output re-enables automatically once the temperature drops below the limit.