FAN25800AUC28X

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

The FAN25800AUC28X is a linear low-dropout regulator with a fixed 2.8 V output and a maximum current of 250 mA. It operates within an input voltage range of 2.3 V to 5.5 V and maintains a supply current of 17 µA during regulation. The device features high power supply rejection ratio (85 dB at 100 Hz) and low output noise density (19 nV/√Hz at 10 kHz). It includes controlled soft-start, thermal shutdown, and short-circuit protection. Stability is achieved using two 1.5 µF ceramic capacitors in a 4-ball WLCSP package measuring 0.65 mm x 0.65 mm.

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

• High PSRR and low output noise for sensitive applications
• Controlled soft-start reduces inrush current
• Integrated thermal shutdown and short-circuit protection
• Compatible with small 0201 case size ceramic capacitors

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 exact part number against ON Semiconductor's official database due to Fairchild integration naming changes. Confirm that the specific ordering suffix matches the required output voltage and current rating. Ensure compatibility with the recommended external capacitor values and PCB layout guidelines specified in the datasheet for optimal performance and stability.

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

Select this component when a fixed 2.8 V rail is required with a maximum load of 250 mA. It is suitable for space-constrained designs utilizing WLCSP packaging. Consider its low quiescent current and high PSRR for noise-sensitive circuits. Verify that the input voltage remains within the 2.3 V to 5.5 V range and that the application does not exceed the thermal limits defined in the datasheet.

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

This device belongs to the FAN25800 series of low-dropout regulators manufactured by ON Semiconductor. The series offers various fixed output voltages including 2.7 V, 2.8 V, and 3.3 V options. All variants share the same 4-ball WLCSP package and core architectural features such as low IQ and high PSRR, differing primarily in their regulated output voltage and corresponding maximum current capabilities.

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

Other FAN25800 variants with different output voltages (e.g., FAN25800AUC33X for 3.3 V or FAN25800AUCF27X for 2.7 V) are pin-compatible but provide different regulated outputs. Direct substitution requires matching the specific output voltage requirement of the target circuit.

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

What is the minimum capacitance required for stable operation?

The device is stable with two 1.5 µF ceramic capacitors at the output. It can also operate with one 1.0 µF capacitor at both the input and output.

How does the enable pin function?

The EN pin controls the shutdown mode. When LOW, the device shuts down and disconnects the output. It lacks an internal pull-down resistor and should not be left floating.