IRU3011 Datasheet, PDF (1/13 Pages) International Rectifier – 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC

Data Sheet No. PD94143
IRU3011
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK
CONTROLLER IC
FEATURES
DESCRIPTION
Dual Layout compatible with HIP6004A
Designed to meet Intel specification of VRM8.4 for
Pentium III™
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™ processor DC to DC
converter application
Low Cost Pentium with AGP
The IRU3011 controller IC is specifically designed to meet
Intel specification for latest Pentium III™ 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 RDS(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
±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.
TYPICAL APPLICATION
5V
C1
L1
C5
C3
Q1
R1
R2
Note: Pentium II and Pentium III are trade marks of Intel Corp.
L2
Q2
C8
C10
R3
R4
VOUT
(1.3V - 3.5V)
12V
C2
VID4
VID3
VID2
VID1
VID0
C6
D1
C4
V12 CS+
NC/Gnd
SS
D4
D3
HDrv
D2
NC/ CS-
Boot
IRU3011
D1
D0
LDrv
Ct/Rt
Gnd NC/Sen
V FB
R5
V5/Comp
OVP PGd _C9
C7
Figure 1 - Typical application of the IRU3011.
C11
R9
R7
C12
C13
R8
R6
C14
Power Good
OVP
PACKAGE ORDER INFORMATION
TA (8C)
0 To 70
DEVICE
PACKAGE
IRU3011CW 20-Pin Plastic SOIC WB (W)
VID VOLTAGE RANGE
1.3V to 3.5V
Rev. 1.6
08/20/02
www.irf.com
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