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IRU3011 Datasheet

  • IRU3011

  • 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC

  • 13頁

  • IRF

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Data Sheet No. PD94143
IRU3011
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK
CONTROLLER IC
DESCRIPTION
The IRU3011 controller IC is specifically designed to meet
Intel specification for latest Pentium III鈩?microproces-
sor applications as well as the next generation P6 fam-
ily processors. These products feature a patented topol-
ogy that in combination with a few external components
as shown in the typical application circuit,will provide 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. These devices also
features, loss less current sensing by using the R
DS(ON)
of the high side Power MOSFET as the sensing resis-
tor, a Power Good window comparator that switches its
open collector output low when the output is outside of a
鹵10%
window and an Over-Voltage Protection output.
Other features of the device are: Under-voltage lockout
for both 5V and 12V supplies, an external programmable
soft-start function as well as programming the oscillator
frequency by using an external capacitor.
FEATURES
Dual Layout compatible with HIP6004A
Designed to meet Intel specification of VRM8.4 for
Pentium III鈩?/div>
On-Board DAC programs the output voltage from
1.3V to 3.5V. The IRU3011 remains on for VID code
of (11111).
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
Over-Voltage Protection Output
Soft-Start
High current totem pole driver for direct driving of the
external power MOSFET
Power Good Function
APPLICATIONS
Pentium III & Pentium II鈩?processor DC to DC
converter application
Low Cost Pentium with AGP
TYPICAL APPLICATION
5V
C1
L1
C5
C3
R2
R3
R1
Q1
Note:
Pentium II and Pentium III are trade marks of Intel Corp.
Q2
C8
R4
L2
C10
V
OUT
(1.3V - 3.5V)
C6
C11
D1
C4
R7
V12
NC/Gnd
CS+
HDrv
NC/
Boot
CS-
LDrv
Gnd
NC/Sen
V
FB
C13
R5
V5/Comp
D3
D2
D1
D0
Ct/Rt
OVP
PGd
C9
R8
C12
R9
12V
IRU3011
SS
C2
D4
VID4
C7
VID3
VID2
VID1
VID0
R6
Power Good
C14
OVP
Figure 1 - Typical application of the IRU3011.
PACKAGE ORDER INFORMATION
T
A
(8C)
0 To 70
Rev. 1.6
08/20/02
DEVICE
IRU3011CW
PACKAGE
20-Pin Plastic SOIC WB (W)
www.irf.com
VID VOLTAGE RANGE
1.3V to 3.5V
1

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