FAN2502SX

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

The FAN2502SX is a micropower low-dropout linear regulator utilizing CMOS technology. It provides an adjustable output voltage ranging from the bandgap reference of 1.32V up to near the input voltage, determined by an external resistor divider connected to Pin 4 (ADJ). The device supports a maximum continuous output current of 150mA with a peak capability of 300mA. Operating conditions include an input voltage range of 2.7V to 6.5V and a junction temperature range of -40°C to +125°C. Key electrical parameters include a dropout voltage of 150mV at full load, a ground pin current of 25µA, and a shutdown current of less than 1µA.

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

• Adjustable output voltage configuration via external resistors on Pin 4
• Ultra-low power consumption with minimal ground current in active mode
• Integrated thermal limiting protection against overheating
• Enable/Shutdown control for deep sleep operation

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

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

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

Verify that the specific part number corresponds to the adjustable version (Pin 4 ADJ) rather than fixed-voltage variants which utilize Bypass or Error pins. Confirm package integrity for the SOT-23-5 form factor. Ensure application design accounts for the required external feedback network to set the desired output voltage level within the specified operating limits.

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 footprint. It is suitable for battery-powered portable electronics where minimizing quiescent current is critical. Designers must provide an external resistor divider to program the output voltage and ensure adequate heat dissipation on the PCB to manage thermal resistance during high-load operations.

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

This device belongs to the FAN2502/FAN2503 family of 150mA CMOS LDO regulators manufactured by onsemi (formerly Fairchild Semiconductor). The family distinguishes models by Pin 4 functionality: the FAN2502 offers an Adjustable input, while the FAN2503 provides an Error flag. These regulators are designed as cost-effective replacements for older BiCMOS designs, offering improved stability across various capacitor types.

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

The datasheet notes that the FAN2502/03 family is pin-compatible with many popular devices. However, no specific substitute part numbers are listed in the provided documentation.