FAN2502S33X

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

The FAN2502S33X is a micropower low-dropout voltage regulator manufactured by onsemi. It provides a fixed 3.3V output with a maximum current of 150 mA. The device operates within an input voltage range of 2.7 V to 6.5 V and features a dropout voltage of 150 mV at full load. It utilizes CMOS technology for ultra-low power consumption, drawing only 25 µA ground current. The component includes thermal limiting protection and an enable/shutdown control pin that reduces shutdown current to less than 1 µA. Pin 4 serves as a bypass terminal for noise reduction.

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

• Utilizes CMOS technology for micropower operation and cost-effective performance in portable devices.
• Features extremely low dropout voltage and high tolerance for various external capacitor ESR values.
• Includes onboard thermal protection circuitry to shut down the output during overload conditions.
• Provides user-controllable enable/shutdown functionality to minimize supply current.

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 the specific suffix 'XX' indicates a fixed 3.3V output with a Bypass pin configuration. Confirm the package type matches SOT-23-5 requirements. Ensure the application design accounts for the thermal resistance characteristics of the PCB footprint to maintain junction temperature within limits. Check datasheet specifications for line and load regulation accuracy relative to system requirements.

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

Select this component when a fixed 3.3V rail is required with minimal quiescent current draw. The wide capacitor ESR tolerance simplifies bill-of-materials selection compared to older LDO designs. Consider the thermal dissipation capabilities of the SOT-23-5 package if operating near maximum load currents or high ambient temperatures. Verify that the input voltage remains above the minimum threshold for stable regulation.

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

The FAN2502S33X belongs to the FAN2502/03 family of 150 mA CMOS LDO regulators. This series was designed to improve upon older BiCMOS designs, offering pin compatibility with popular legacy devices. The FAN2502 variant distinguishes itself from the FAN2503 through its Pin 4 function, which allows for either adjustable voltage settings or bypass noise reduction rather than error flagging.

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

The datasheet notes that the FAN2502/03 family is pin-compatible with many popular older devices. Designers should verify electrical parameters against existing components in the circuit to ensure equivalent performance regarding dropout voltage and current handling capabilities.