IRU3004 Datasheet, PDF (1/17 Pages) International Rectifier – 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH DUAL LDO CONTROLLER

Data Sheet No. PD94140
IRU3004
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK
CONTROLLER IC WITH DUAL LDO CONTROLLER
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
DESCRIPTION
The IRU3004 controller IC is specifically designed to meet
Intel specifications for Pentium III™ 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 RDS(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 ±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.
TYPICAL APPLICATION
Q1
5V
L1
C5
R1
C13
C3
R2
L2
Note: Pentium III is trademark of Intel Corp.
R16 R17
VOUT 3
C7
C16
Q2
C10
R4
R3
R12 R13
3.3V
C4
12V
R18
V12
C1
C2
Ct
SS
D4
VID4
VID3
VID2
VID1
VID0
C6
Q3
V5 CS+ HDrv CS- LDrv Gnd VFB3
Lin1
IRU3004
VFB1
D3
D2
D1
D0 VFB2 PGd Lin2
3.3V
R11
C15
Q4
C9
R5
R9
C14
C8
Power Good
Figure 1 - Typical application of the IRU3004.
VOUT 1
C11
R7
R8
VOUT 2
C12
R14
R15
PACKAGE ORDER INFORMATION
TA (8C)
0 To 70
0 To 70
DEVICE
IRU3004CW
IRU3004CF
PACKAGE
20-Pin Plastic SOIC (W)
20-Pin Plastic TSSOP (F)
Rev. 1.7
07/16/02
www.irf.com
1