LT1581-2.5 Datasheet | Linear Technology

LT1581/LT1581-2.5 10A, Very Low Dropout Regulators Features s s s s s s DESCRIPTION The LT ® 1581 is a 10A low dropout regulator designed to power the new generation of microprocessors. The dropout voltage of this device is 100m V at light loads rising to just 430m V at 10A. To achieve this dropout a second low current input voltage 1V greater than the output voltage is required. The device can also be used as a single supply device where dropout is parable to an LT1584. Several other new Features have been added to the LT1581. A remote SENSE pin is brought out. This feature virtually eliminates output voltage variations due to load changes. Typical load regulation for a load current step of 100m A to 10A, measured at the SENSE pin, is less than 1m V. The LT1581 has fast transient response, equal to the LT1584. On fixed voltage devices, the ADJUST pin is brought out. A small capacitor on the ADJUST pin further improves transient response. This device is ideal for generating processor supplies of 2V to 3V on motherboards where both 5V and 3.3V supplies are available. , LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation. Power PC is a trademark of IBM Corporation. Low Dropout, 430m V at 10A Output Current Fast Transient Response Remote Sense 1m V Load Regulation Fixed 2.5V Output and Adjustable Output No Supply Sequencing Problems in Dual Supply Mode U APPLICATIONS s s s s s s Microprocessor Supplies Post Regulators for Switching Supplies High Current Regulators 5V to 3.XXV for Pentium® Processors Operating at 90MHz to 166MHz and Beyond 3.3V to 2.9V for Portable Pentium Processor Power PCTM Series Power Supplies TYPICAL APPLICATION 2.5V Microprocessor Supply POWER OUTPUT 2.5V/10A Dropout Voltage - Minimum Power Voltage INDICATES GUARANTEED TEST POINTS 100µF TANT AVX TPS ×7 + 330µF OS-CON + MINIMUM POWER VOLTAGE (V) (VPOWER - VOUT) (V) 3.3V 10A 0.7 0.6 0.5 0.4 0.3 0.2...