FAN2518S28X

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

The FAN2518S28X is a micropower low-dropout (LDO) voltage regulator from the FAN2518/19 family, manufactured by onsemi. It provides a fixed output voltage of 2.8V with a maximum continuous load current of 50 mA and a peak current capability of 300 mA. The device operates within an input voltage range of 2.7 V to 6.5 V and features a typical dropout voltage of 50 mV at 50 mA. It utilizes CMOS technology for ultra-low power consumption, drawing only 25 µA ground current at full load. The component includes thermal limiting protection that shuts down the output if the junction temperature exceeds 150°C.

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

• Ultra-low power consumption optimized for battery-powered portable devices
• Fast enable/shutdown control allowing re-enablement within 500 microseconds
• Exceptional loop stability accommodating a wide variety of external capacitors
• Integrated thermal limiting protection against overload conditions

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 'S28X' confirms the 2.8V fixed output and BYP pin configuration. Ensure the ordering code matches the SOT-23-5 package type. Confirm compliance with RoHS directives as indicated in the datasheet. Check for any recent product change notifications regarding pin compatibility or electrical characteristics before finalizing procurement.

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

Select this component when a stable 2.8V rail is required for sensitive analog or digital circuits in space-constrained designs. The adjustable version (FAN2518SX) should be chosen if variable output voltages are needed. For applications requiring fault indication, the FAN2519 series with an error flag pin is more suitable. Consider the thermal resistance of the PCB layout to ensure operation within the 125°C junction temperature limit under high load conditions.

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

This part belongs to the FAN2518/FAN2519 family of 50 mA CMOS LDO regulators. These devices were designed to replace older BiCMOS designs, offering improved performance in GSM, TDMA, and CDMA cellular handsets. The family shares common internal architecture but differs in Pin 4 functionality: ADJ for adjustable voltage, BYP for noise reduction, or ERR for fault flagging.

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

The datasheet notes that these products are pin-compatible with many popular legacy devices. However, specific substitute part numbers are not explicitly listed in the provided documentation. Designers should verify pin-out compatibility and electrical parameter overlap with existing components before substitution.