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IRU3004CF Datasheet

  • IRU3004CF

  • 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH DUAL ...

  • 17頁

  • IRF

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Data Sheet No. PD94140
IRU3004
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK
CONTROLLER IC WITH DUAL LDO CONTROLLER
DESCRIPTION
The IRU3004 controller IC is specifically designed to meet
Intel specifications for Pentium III鈩?microprocessor
applications as well as the next generation P6 family
processors. The IC provides a single chip controller IC
for the Vcore, GTL+ and clock supplies required for the
Pentium III applications. The IRU3004 features a pat-
ented topology, 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 meeting
the latest VRM specification. The IRU3004 also features
loss-less current sensing by using the R
DS(on)
of the high
side power MOSFET as the sensing resistor and a Power
Good window comparator that switches its open collec-
tor output low when the output is outside of a
鹵10%
window. Other features of the device are: under-voltage
lockout for both 5V and 12V supplies, an external pro-
grammable soft-start function as well as programming
the oscillator frequency by using an external capacitor.
FEATURES
Meets latest VRM 8.4 specification for PentiumIII
Provides single chip solution for Vcore, GTL+ and
clock supply
On-Board DAC programs the output voltage from
1.3V to 3.5V. The IRU3004 remains on for VID code
of (11111)
Dual linear regulator controller on-board for 1.5V
GTL+ and 2.5V clock supplies
Loss-less Short Circuit Protection
Synchronous operation allows maximum efficiency
Patented architecture allows fixed frequency opera-
tion as well as 100% duty cycle during dynamic
load
Minimum Part Count, No External Compensation
Soft-Start Function
High current totem pole driver for direct driving of the
external power MOSFET
Power Good Function
APPLICATIONS
Pentium III & next generation processor DC to DC
converter application
Low Cost Pentium with AGP
TYPICAL APPLICATION
5V
L1
C5
C13
C3
R2
R1
Q1
L2
R16
C7
Q2
R4
R3
R12
R13
R17
C16
Note:
Pentium III is trademark of Intel Corp.
V
OUT
3
C10
3.3V
C4
C6
Q3
C11
V12
Ct
C1
SS
C2
D4
D3
D2
D1
D0
V
FB2
PGd
V5
CS+
HDrv
CS-
LDrv
Gnd
V
FB3
R11
Lin1
R7
V
OUT
1
12V
R18
IRU3004
V
FB1
Lin2
3.3V
C9
Q4
C15
R8
V
OUT
2
C12
R14
VID4
VID3
VID2
VID1
VID0
C8
R5
R9
C14
R15
Power Good
Figure 1 - Typical application of the IRU3004.
PACKAGE ORDER INFORMATION
T
A
(8C)
0 To 70
0 To 70
Rev. 1.7
07/16/02
DEVICE
IRU3004CW
IRU3004CF
PACKAGE
20-Pin Plastic SOIC (W)
20-Pin Plastic TSSOP (F)
www.irf.com
1

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