FAN2503S285X

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

The FAN2503S285X is a fixed-output low-dropout linear regulator from the FAN2502/03 family, manufactured by onsemi. It provides a regulated output voltage of 2.85V with a maximum continuous load current of 150mA. The device operates within an input voltage range of 2.7V to 6.5V and utilizes a compact SOT-23-5 surface-mount package. Key electrical characteristics include a dropout voltage of up to 180mV at full load, a ground pin current of 50µA under load, and an output voltage accuracy of ±2%. It features thermal limiting protection that activates at 150°C.

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

• Integrated error flag output (ERR) on Pin 4 indicates when the output voltage drops below 95% of the nominal value due to fault conditions such as input dropout or overload.
• CMOS technology enables ultra-low power consumption with a ground current of 50µA at full load and less than 1µA during shutdown mode.
• Exceptional loop stability allows operation with a wide variety of external capacitors, accommodating ESR values ranging from 10mΩ to over 10Ω.

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 '285' confirms the 2.85V fixed output voltage and 'X' denotes tape and reel packaging. Confirm the ERR pin functionality aligns with system diagnostic requirements. Check for RoHS compliance status in the latest datasheet revision. Ensure the SOT-23-5 footprint matches the PCB layout constraints. Validate that the 150mA current rating meets the peak load demands of the target application circuit.

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

Select this component when a fixed 2.85V rail is required with minimal quiescent current draw. The FAN2503 variant is preferred over the adjustable FAN2502 if hardware error monitoring is needed via the ERR pin. Consider the thermal resistance of the SOT-23-5 package and ensure adequate copper area on the PCB to manage heat dissipation at high loads. Verify that the input voltage remains above the minimum operating threshold plus the dropout voltage across all expected load conditions.

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

This part belongs to the FAN2502/FAN2503 micropower LDO family designed for portable battery-powered devices. The series distinguishes itself from older BiCMOS designs through CMOS optimization for low noise and high stability. While the FAN2502 offers adjustable outputs or bypass pins, the FAN2503 specifically integrates an error flag for fault detection, making it suitable for systems requiring voltage supervision.

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

Pin-compatible alternatives within the same family include other FAN2503 variants with different fixed voltages (e.g., FAN2503S33X for 3.3V). Direct functional replacements may include other 150mA CMOS LDOs with similar SOT-23-5 footprints and error flag capabilities, provided thermal and electrical specifications are matched.