FAN2559MP18X

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

The FAN2559MP18X is a fixed-output low voltage CMOS LDO regulator manufactured by onsemi. It provides a regulated 1.8V output with a maximum load current of 180mA. The device operates within an input voltage range of 2.7V to 5.5V and features a typical dropout voltage of 250mV at full load. It incorporates a power good indicator, thermal shutdown, and current limit protection. The component is housed in a 6-lead MLP package measuring 2mm x 2mm.

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

• Fixed 1.8V output with 1% accuracy
• Power Good open-drain indicator
• Low noise operation via bypass pin
• Thermal shutdown and current limit

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

• Processor power-up sequencing
• Cell phones and PDAs
• Portable electronic equipment
• PCMCIA Vcc and Vpp regulation

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

Verify the specific suffix 'MP18X' against the manufacturer's official ordering guide to confirm the MLP-6 package and 1.8V fixed output configuration. Confirm compliance status and lifecycle stage, as this device family may be discontinued or subject to obsolescence notices. Ensure the source document matches the exact part number for accurate electrical specifications.

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

Select this component for applications requiring a stable 1.8V rail from a single-cell battery or low-voltage supply. The MLP-6 package suits space-constrained designs. Verify that the required output capacitor ESR falls within the stable range of 0 to 300mΩ. Consider the low quiescent current for battery-powered systems.

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

This part belongs to the FAN2558/FAN2559 family of low voltage CMOS LDOs. The FAN2559 variant specifically includes a noise bypass pin for enhanced performance in sensitive analog circuits. The family offers fixed and adjustable output options in SOT-23 and MLP packages.

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

Check for updated part numbers due to Fairchild Semiconductor integration naming changes. Verify if FAN2558MP18X is functionally equivalent but lacks the noise bypass feature. Consult onsemi representatives for active replacements if this device is marked discontinued.

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

What is the purpose of the BYP pin on the FAN2559?

The BYP pin allows connection of an external capacitor to significantly reduce output noise for ultra-low noise operation.

How does the Power Good (PG) pin indicate status?

The PG pin is an open-drain output that goes LOW when the output voltage drops below 95% of its nominal value.