FAN2519S26X

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

The FAN2519S26X is a fixed-output micropower low-dropout voltage regulator from the FAN2518/19 family, manufactured by onsemi. It provides a nominal output voltage of 2.6V with a maximum continuous output current of 50mA. The device utilizes CMOS technology and features an Enable pin for shutdown control, reducing quiescent current to less than 1µA. Pin 4 serves as an open-drain Error flag (ERR) that indicates when 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

• Integrated open-drain error flag output at Pin 4 to signal fault conditions including undervoltage, overheating, or overcurrent.
• Ultra-low power consumption with ground current of 25µA at full load and shutdown current reduced to less than 1µA via the Enable pin.
• Fast start enable capability allowing re-enablement within 500µs, optimized for CDMA time phases in cellular applications.
• Exceptional loop stability accommodating a wide variety of external capacitors with ESR values ranging from 10mΩ to 10Ω.

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

• GSM, TDMA, and CDMA cellular handsets
• Laptop, notebook, and palmtop computers
• Portable cameras and video recorders
• Personal Digital Assistants (PDAs)

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

Verify the specific suffix 'S26X' confirms the 2.6V fixed output and ERR pin function. Confirm package type is SOT-23-5. Check manufacturer documentation for lifecycle status as older Fairchild parts may be discontinued or subject to obsolescence notices. Ensure environmental compliance data matches project requirements.

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

Select this component when a fixed 2.6V rail is required with diagnostic feedback capabilities. The ERR pin distinguishes it from the FAN2518 series, which offers adjustable or bypass options instead. Suitable for battery-powered designs requiring fast power cycling and high tolerance for diverse output capacitor types without compromising stability.

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

Part of the FAN2518/FAN2519 family of 50mA CMOS LDO regulators. The FAN2519 variant specifically replaces the ADJ/BYP pins found in the FAN2518 with an ERR diagnostic flag. This family was designed to improve upon older BiCMOS designs with lower dropout voltages and better thermal protection.

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

Pin-compatible with FAN2518 series devices; however, verify Pin 4 functionality differences. FAN2518S26X uses BYP instead of ERR. Direct functional replacement requires matching the diagnostic requirement.

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

What is the function of Pin 4 on the FAN2519S26X?

Pin 4 is an open-drain Error flag (ERR) output. It goes LOW when the output voltage drops below 95% of the nominal rated voltage due to faults like input dropout, overheating, or overloading.

How does the FAN2519S26X handle thermal overload?

Onboard thermal protection shuts down the output if the die temperature exceeds 150°C. The output remains suspended until the temperature drops below this limit, at which point it automatically re-enables.