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IRU3027

International Rectifier
Part Number IRU3027
Manufacturer International Rectifier
Description 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER
Published Oct 21, 2005
Detailed Description Data Sheet No. PD94146 IRU3027 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH TRIPLE LDO CONTROLLER FEATURES DE...
Datasheet PDF File IRU3027 PDF File

IRU3027
IRU3027

Overview
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(1.
5V) and VOUT4(1.
8V).
No external resistor divider is necessary for any of the regulators.
The switching regulator features a patented topology that in combination with a few external components as shown in the typical application circuit, will provide well in excess of 20A of output current for an on-board DC-DC converter while automatically providing the right output voltage via the 5-bit internal DAC.
The IRU3027 also features loss-less current sensing for both switchers by using the RDS(ON...


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