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www.fairchildsemi.com FAN2500, FAN2501 100 mA CMOS LDO Regulators Features · · · · · · · Ultra Low Power Consumption 100 mV dropout voltage at 100 mA 25 µA ground current at 100 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 FAN2500/01 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 FAN2500 and FAN2501 devices are distinguished by the assignment of pin 4: FAN2500: pin 4 ­ ADJ, allowing the user to adjust the output voltage over a wide range using an external voltage divider. FAN2500-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. FAN2501-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 FAN2500/01 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 FAN2500 GND FAN2500-XX EN VIN Bandgap p VOUT ERR Error Amplifier Thermal Sense VIN Bandgap p VOUT EN BYP Error Amplifier GND Thermal Sense FAN2501-XX GND REV. 1.0.6 2/14/03 PRODUCT SPECIFICATION FAN2500/FAN2501 Pin Assignments VIN GND EN 1 5 VOUT 2 3 4 ADJ/BYP/ERR Pin No. 1. 2. 3. 4. 5. FAN2500 VIN GND EN ADJ VOUT FAN2500-XX VIN GND EN BYP VOUT FAN2501-XX VIN GND EN ERR VOUT Pin Descriptions Pin Name ADJ BYP ERR Pin No. 4 4 4 Type Input Passive Open drain Pin Function Description FAN2500 Adjust. Ratio of potential divider from VOUT to ADJ determines output voltage. FAN2500-XX Bypass. Connect 470 pF capacitor for noise reduction. FAN2501-XX Error. Error flag output. 0: Output voltage < 95% of nominal. 1: Output voltage > 95% of nominal. Enable. 0: Shutdown VOUT. 1: Enable VOUT. Voltage Input. Supply voltage input. Voltage Output. Regulated output voltage. Ground. EN 3 Digital Input VIN VOUT GND 1 5 2 Power in Power out Power Functional Description Designed utilizing CMOS process technology, the FAN2500/01 family of products are carefully optimized for use in compact battery-powered devices, offering a unique combina