FAN2519S285X

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

The FAN2519S285X is a fixed-output low-dropout voltage regulator from the FAN2518/19 family, manufactured by onsemi. It provides a nominal output voltage of 2.85V with a maximum continuous output current of 50mA. The device utilizes CMOS technology and features an enable/shutdown control pin that reduces ground current to less than 1µA when disabled. Pin 4 serves as an open-drain error flag (ERR) indicating if the output voltage drops below 95% of the nominal value due to faults such as input dropout or thermal overload. It operates within an input voltage range of 2.7V to 6.5V and supports junction temperatures up to 125°C.

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

• Features an open-drain error flag output at pin 4 to indicate fault conditions where output voltage falls below 95% of the nominal rating.
• Utilizes CMOS technology to achieve ultra-low power consumption and fast start-up times suitable for CDMA applications.
• Includes onboard thermal limiting protection that disables the output when die temperature exceeds 150°C.
• Offers high loop stability across a wide range of external capacitor ESR values.

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

• Cellular phones and accessories
• PDAs
• Portable cameras and video recorders
• Laptop, notebook and palmtop computers

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

Verify the specific suffix 'X' indicates tape and reel packaging configuration. Confirm the manufacturer designation as onsemi or Fairchild Semiconductor depending on production date. Ensure the component meets RoHS compliance requirements for the intended application environment. Check datasheet revision history for any updates to electrical characteristics or mechanical dimensions prior to final design approval.

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

Select this component for portable battery-powered devices requiring a stable 2.85V rail with minimal quiescent current draw. The SOT-23-5 package is suitable for space-constrained designs. Consider the error flag functionality for system monitoring in critical applications. Ensure the input voltage remains above the minimum threshold while accounting for dropout voltage variations under load.

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

This part belongs to the FAN2518/19 micropower LDO family designed for GSM, TDMA, and CDMA cellular handsets. The FAN2519 variant specifically distinguishes itself from the adjustable FAN2518 by providing a diagnostic error flag instead of an adjustment pin. These regulators offer significant improvements over older BiCMOS designs with lower power consumption and enhanced thermal management capabilities.

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

FAN2519S285X is pin-compatible with other FAN2519 variants featuring different output voltages. Verify that substitute components support the same 50mA output current and maintain similar dropout voltage characteristics. Ensure replacement parts also include the open-drain error flag functionality if system diagnostics are required.