IRU3007

1

Rev. 2.1

08/20/02

www.irf.com

TYPICAL APPLICATION

DESCRIPTION

The IRU3007 controller IC is specifically designed to meet

Intel specification for Pentium II

™ microprocessor ap-

plications as well as the next generation of P6 family

processors. The IRU3007 provides a single chip control-

ler IC for the Vcore, LDO controller for GTL+ and an

internal 200mA regulator for clock supply which are re-

quired 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 fea-

tures, loss-less current sensing for both switchers by

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 out-

puts is outside of a pre-programmed window. Other fea-

tures of the device are: Under-Voltage Lockout for both

5V and 12V supplies, an external programmable soft-

start function, programming the oscillator frequency via

an external resistor, Over-Voltage Protection (OVP) cir-

cuitry for both switcher outputs and an internal thermal

shutdown.

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 specifica-

tion for Pentium II

™

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

PACKAGE ORDER INFORMATION

FEATURES

5-BIT PROGRAMMABLE SYNCHRONOUS BUCK, NON-SYNCHRO-

NOUS, ADJUSTABLE LDO AND 200mA ON-BOARD LDO

APPLICATIONS

Total Power Solution for Pentium II processor

application

Note: Pentium II and Pentium Pro are trademarks of Intel Corp.

DEVICE

PACKAGE

0 To 70

IRU3007CW

28-pin Plastic SOIC WB (W)

Data Sheet No. PD94142

Figure 1 - Typical application of IRU3007.

LINEAR

CONTROL

SWITCHER2

CONTROL

LINEAR

REGULATOR

SWITCHER1

CONTROL

IRU3007

5V