FAN2508

www.fairchildsemi.com

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www.fairchildsemi.com

FAN2508, FAN2509
50 mA CMOS LDO Regulators

Features
Ultra Low Power Consumption 50 mV dropout voltage at 50 mA 25 A ground current at 50 mA Enable/Shutdown Control SOT23-5 package Thermal limiting 300 mA peak current

wide variety of external capacitors, and the compact SOT23-5 surface-mount package. The FAN2508/09 family of products offer significant improvements over older BiCMOS designs and are pin-compatible with many popular devices. The output is thermally protected against overload. The FAN2508 and FAN2509 devices are distinguished by the assignment of pin 4: FAN2508: pin 4 ADJ, allowing the user to adjust the output voltage over a wide range using an external voltage divider. FAN2508-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. FAN2509-XX: pin 4 ERR, a flag which indicates that the output voltage has dropped below the specified minimum due to a fault condition. The standard fixed output voltages available are 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 3.0V, and 3.3V. Custom output voltage are also available: please contact your local Fairchild Sales Office for information.

Applications
Cellular Phones and accessories PDAs Portable cameras and video recorders Laptop, notebook and palmtop computers

Description
The FAN2508/09 family of micropower low-dropout voltage regulators utilize CMOS technology to offer a new level of cost-effective performance in GSM and TDMA cellular handsets, Laptop and Notebook portable computers, and other portable devices. Features include extremely low power consumption and low shutdown current, low dropout voltage, exceptional loop stability able to accommodate a

Block Diagrams
EN VIN Bandgap Error Amplifier p VOUT ADJ Thermal Sense FAN2508 GND FAN2508-XX EN VIN Bandgap p VOUT ERR Error Amplifier Thermal Sense VIN Bandgap p VOUT EN BYP Error Amplifier

GND

Thermal Sense FAN2509-XX

GND

REV. 1.0.6 2/14/03