FAN25800AUC33X

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

The FAN25800AUC33X is a low-dropout linear regulator (LDO) manufactured by onsemi, providing a fixed 3.3 V output with a maximum current of 500 mA. It operates within an input voltage range of 2.3 V to 5.5 V and features a typical quiescent current of 17 µA during regulation. The device incorporates controlled soft-start functionality to limit inrush current and includes thermal shutdown, input under-voltage lockout, and short-circuit protection. It maintains stability using small ceramic capacitors as small as 0201 case size.

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

• High power supply rejection ratio for noise-sensitive applications
• Low quiescent current operation with optimized dropout transitions
• Integrated thermal shutdown and short-circuit protection mechanisms
• Controlled soft-start cycle to minimize inrush current

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

• WiFi Modules
• PDA Handsets
• Smart Phones, Tablets, Portable Devices

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

Verify the specific ordering suffix 'AUC33X' to confirm the 3.3 V output voltage and 500 mA current rating. Ensure compatibility with the 4-bump WLCSP package dimensions. Confirm that the application environment remains within the specified -40°C to +85°C operating temperature range. Validate external capacitor selections against the datasheet requirements for loop stability.

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

Select this component when a stable 3.3 V rail is required from inputs between 2.3 V and 5.5 V. It is suitable for space-constrained designs due to the compact WLCSP footprint. Consider its low noise characteristics for RF sections or post-regulation stages. Verify that the load current does not exceed 500 mA and that thermal dissipation remains within junction temperature limits.

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

This part belongs to the FAN25800 series of low-IQ, low-noise LDO regulators. It shares architectural similarities with variants offering different output voltages, such as 2.7 V and 2.8 V options. The series is designed for portable electronics requiring high PSRR and minimal board space. It utilizes a 4-ball WLCSP package optimized for surface-mount assembly.

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

FAN25800AUC28X

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

What is the minimum effective capacitance required for loop stability?

The device requires an output capacitor with an effective capacitance between 400 nF and 15 µF for stable operation.

How does the enable pin function regarding shutdown mode?

When the EN pin is driven LOW, the device enters shutdown mode, disconnecting the output load and reducing supply current to below 1 µA.