IRU3027

Data Sheet No. PD94146 IRU3027 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH TRIPLE LDO CONTROLLER FEATURES DESCRIPTION Designed to meet VRM 9.0 specification for next generation microprocessors On-Board 5-Bit DAC programs the output voltage from 1.075V to 1.850V in 25mV steps Linear Regulator Controller On-Board for 1.8V Provides single chip solution for Vcore, GTL+, AGP bus, and 1.8V Automatic Voltage Selection for AGP Slot VDDQ Supply Linear Regulator Controller On-Board for 1.5V GTL+ Supply Loss-less Short Circuit Protection for all Outputs Synchronous operation allows maximum efficiency Patented architecture allows fixed frequency operation as well as 100% duty cycle during dynamic load Minimum Part Count Soft-Start High current totem pole driver for direct driving of the external power MOSFET Power Good function monitors all outputs Over-Voltage Protection Circuitry protects the switcher output and generates a fault output The IRU3027 controller IC is specifically designed to meet VRM 9.0 specification for next generation microprocessor applications requiring multiple on-board regulators. The IRU3027 provides a single chip controller IC for the Vcore, three LDO controllers, one with an automatic select pin that connects to the Type Detect pin of the AGP slot for the AGP V DDQ supply, one for GTL+ and the other for the 1.8V chip set regulator as required for the next generation PC applications. The IRU3027 is designed to use either bipolar transistors for VOUT3...