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IRU3013 Datasheet(PDF) 1 Page - International Rectifier

Part # IRU3013
Description  VRM 8.5 COMPATIBLE 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH TRIPLE LDO CONTROLLER
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IRU3013 Datasheet(HTML) 1 Page - International Rectifier

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IRU3013
1
Rev. 1.2
09/06/01
TYPICAL APPLICATION
DESCRIPTION
The IRU3013 controller IC is specifically designed for
Intel Pentium III
 microprocessor applications as de-
scribed in the VRM 8.5 specification. The IC provides
a single chip solution for the Vcore, 1.2V AGTL+,
1.8V and a third uncommitted LDO controller that
can be used either as 1.2V power good detector or
to provide 1.5V AGP bus in applications that this
voltage is required. The IRU3013 features a patented
topology that, in combination with a few external com-
ponents, (*Note: See application current in figure 3) will
provide in excess of 30A of output current for an on-
board Vcore synchronous converter while automatically
providing the output voltage specified in VRM 8.5 speci-
fication. The IRU3013 also features, loss-less current
sensing by using the RDS(ON) of the high side Power
MOSFET as the sensing resistor, a Power Good win-
dow comparator that switches its open collector output
low when the output is outside of a
±10% window. Other
features of the device are: Under-voltage lockout for both
5V and 12V supplies, an external programmable soft-
start function, and the ability to program the oscillator
frequency by connecting an external capacitor.
Meets Latest VRM 8.5 Specification
Provides Single Chip Solution for Vcore, 1.2V AGTL+,
1.8V and VDDQ
On-Board 5-Bit DAC and Decoder programs the out-
put voltage from 1.050V to 1.825V
Loss-less Short Circuit Protection
Synchronous operation allows maximum efficiency
Patented architecture allows fixed frequency opera-
tion as well as 100% duty cycle when operating with
a changing load
Minimum Part Count, No External Compensation
Soft-Start
High current totem pole driver for directly driving an
external Power MOSFET
Power Good Function
PACKAGE ORDER INFORMATION
FEATURES
VRM 8.5 COMPATIBLE
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK
CONTROLLER IC WITH TRIPLE LDO CONTROLLER
Pentium III with VRM 8.5 Specification
DC to DC Converters
Note: Pentium III is trade mark of Intel Corp.
TA (°C)
DEVICE
PACKAGE
0 To 70
IRU3013CW
24-Pin Plastic SOIC WB
0 To 70
IRU3013CQ
24-Pin Plastic QSOP
APPLICATIONS
Data Sheet No. PD94249
Figure 1 - Typical application of IRU3013.
LINEAR
CONTROL
LINEAR
CONTROL
SWITCHER
CONTROL
IRU3013
VOUT3
5V
VOUT1
VOUT4
LINEAR
CONTROL
VOUT2
3.3V
VRM 8.5 VID


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