IRU3007

Features:

·Provides Single Chip Solution for Vcore, GTL+, Clock Supply & 3.3V Switcher On-Board
·Second switcher provides simple control for the on-board 3.3V supply
·200mA On-Board LDO Regulator
·Designed to meet Intel VRM 8.2 and 8.3 specification for Pentium II^TM
·On-Board DAC programs the output voltage from 1.3V to 3.5V
·Linear Regulator Controller On-Board for 1.5V GTL+ supply
·Loss-less Short Circuit Protection
·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 drivers for directly driving the external Power MOSFETs
·Power Good function monitors all outputs
·Over-Voltage Protection circuitry protects the switcher outputs and generates a fault output
·Thermal Shutdown


Application

Total Power Solution for Pentium II processor application


Pinout




Specifications

V5 Supply Voltage ......................................................................... 7V
V12 Supply Voltage ..................................................................... 20V
Storage Temperature Range ...................................... -65 To 150
Operating Junction Temperature Range ........................ 0 To 125


Description

The IRU3007 controller IC is specifically designed to meet Intel specification for Pentium IIä microprocessor applications as well as the next generation of P6 family processors. The IRU3007 provides a single chip controller IC for the Vcore, LDO controller for GTL+ and an internal 200mA regulator for clock supply which are required for the Pentium II applications. It also contains a switching controller to convert 5V to 3.3V regulator for on-board applications that uses either AT type power supply or is desired not to rely on the ATX power supply's 3.3V output. These devices feature a patented topology that in combination with a few external components, as shown in the typical application circuit, will provide in excess of 14A of output current for an on-board DC/DC converter while automatically providing the right output voltage via the 5-bit internal DAC. The IRU3007 also features, loss-less current sensing for both switchers by using the RDS(on) of the high-side power MOSFET as the sensing resistor, internal current limiting for the clock supply, a Power Good window comparator that switches its open collector output low when any one of the outputs is outside of a pre-programmed window. Other features of the IRU3007 are: Under-Voltage Lockout for both 5V and 12V supplies, an external programmable softstart function, programming the oscillator frequency via an external resistor, Over-Voltage Protection (OVP) circuitry for both switcher outputs and an internal thermal shutdown.