Description The FAN2502 / 03 family of micropower low-dropout voltage regulators utilize CMOS technology to offer a new level of cost-effective performance in mobile handsets, laptop and notebook portable computers, and other portable devices. Features include extremely low power consumption, low shutdown current, low dropout voltage, exceptional loop stability able to accommodate a wide variety of external capacitors, and a compact SOT23-5 surface-mount package. The FAN2502 / 03 family offers significant improvements over older BiCMOS designs and is pin-compatible with many popular devices. The output is thermally protected against overload. The FAN2502 and FAN2503 devices are distinguished by the assignment of pin 4: FAN2502-XX: pin 4 – BYP, to which a bypass capacitor may be connected for optimal noise performance. Output voltage is fixed, indicated by the suffix XX. FAN2503-XX: pin 4 – ERR, a flag that indicates that the output voltage has dropped below the specified minimum due to a fault condition. The standard fixed output voltages available are 2.5 V and 3.3 V.