FAN2558S35X

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

The FAN2558S35X is a fixed-output low voltage CMOS LDO from the FAN2558/FAN2559 family, manufactured by onsemi. It provides a regulated 3.5V output with 1% accuracy and supports up to 180mA load current. The device features an open-drain Power Good indicator, TTL-compatible Enable input, and active output discharge. It operates within a supply voltage range of 2.7V to 5.5V and includes thermal shutdown and current limit protection. The component is available in 5-Lead SOT-23 packages.

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

• Fixed 3.5V output voltage with 1% initial accuracy
• Open-drain Power Good status indicator for system monitoring
• TTL-level compatible Enable pin for fast power-up sequencing
• Integrated thermal shutdown and current limit protection

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

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

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

Verify the specific ordering suffix 'S35X' corresponds to the 3.5V fixed output variant in the 5-Lead SOT-23 package. Confirm compliance with the manufacturer's life support policy restrictions. Check for updated part numbers due to Fairchild Semiconductor integration into onsemi, as underscore characters may have been replaced with dashes in newer systems.

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

Select this component when a stable 3.5V rail is required for low-power digital logic or RF circuits. Ensure the input voltage remains above the dropout threshold while supporting the maximum expected load current. Verify that the application environment stays within the -40°C to +85°C operating temperature range and that PCB layout guidelines are followed to maintain stability with the recommended output capacitor.

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

This device belongs to the FAN2558/FAN2559 series of low voltage CMOS LDOs designed for compact battery-powered systems. The family offers various fixed output voltages and adjustable options. The FAN2558 variant specifically includes a Power Good flag but lacks the dedicated noise bypass pin found in the FAN2559 model. The product line utilizes BiCMOS technology for high ripple rejection and low quiescent current.

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

FAN2558S36X (3.6V Fixed Output)

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

Does the FAN2558S35X include a noise bypass pin?

No, the FAN2558 series does not feature a dedicated bypass pin for noise reduction; this feature is exclusive to the FAN2559 model.

How is the Power Good signal configured?

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