FAN2508SX

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

The FAN2508SX is a micropower low-dropout voltage regulator from the FAN2508/09 family, manufactured by onsemi. It utilizes CMOS technology to provide adjustable output voltages ranging from 1.8V to near the input voltage (VIN). The device operates with an input voltage range of 2.7V to 6.5V and delivers up to 50mA of output current. Key electrical characteristics include a typical dropout voltage of 50mV at 50mA load and a ground pin current of 25µA under the same conditions. The component features thermal limiting protection and an enable/shutdown control pin that reduces supply current to less than 1µA when disabled.

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

• Adjustable output voltage configuration via external resistor divider connected to Pin 4
• Ultra-low power consumption with minimal ground current draw during operation
• Integrated thermal limiting circuitry to protect against overheating under overload conditions
• Enable/Shutdown control pin allows for precise power management and deep sleep modes

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 ordering suffix 'SX' corresponds to the tape and reel packaging format as indicated in the manufacturer's ordering information. Confirm that the adjustable voltage variant matches the design requirements, distinguishing it from fixed-voltage or error-flag versions within the same family. Ensure compliance with RoHS directives if required by the target assembly process.

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

Select this component when an adjustable output voltage is required within a compact surface-mount package. It is suitable for battery-powered applications due to its low quiescent current and high efficiency. Designers must account for the need for external resistors to set the desired output voltage and ensure adequate heat dissipation on the PCB to manage thermal resistance effectively.

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

The FAN2508SX belongs to the FAN2508/FAN2509 family of 50 mA CMOS LDO regulators originally developed by Fairchild Semiconductor, now part of onsemi. This family was designed to replace older BiCMOS designs, offering improved performance in portable electronics. The SX suffix specifically denotes the adjustable version packaged in a SOT23-5 form factor, optimized for space-constrained mobile devices.

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

Pin-compatible alternatives within the FAN2508/09 family include fixed-output variants like FAN2508S28X or diagnostic variants like FAN2509S28X, provided the application does not require user-adjustable voltage settings.