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IRU3005CW Datasheet

  • IRU3005CW

  • 14頁(yè)

  • ETC

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IRU3004, IRU3005
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK
CONTROLLER IC WITH DUAL LDO CONTROLLER
FEATURES
Meets latest VRM 8.4 specification for PIII
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/IRU3005 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
High current totem pole driver for direct driving of the
external power MOSFET
Power Good function
DESCRIPTION
The IRU3004/IRU3005 series of controller ICs are spe-
cifically 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 sup-
plies required for the Pentium III applications. These
devices feature a patented topology, that in combina-
tion 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
five-bit internal DAC meeting the latest VRM specifica-
tion. These products also feature loss-lesscurrent sens-
ing by using the RDS(on) of the high side power MOSFET
as the sensing resistor and a Power Good window com-
parator that switches its open collector output low when
the output is outside of a
鹵10%
window. Other features
of the device are: Undervoltage lockout for both 5V and
12V supplies, an external programmable soft start func-
tion as well as programming the oscillator frequency by
using an external capacitor.
APPLICATIONS
Pentium III & next generation processor DC to DC
converter application
Low cost Pentium with AGP
TYPICAL APPLICATION
L1
L2
Q1
R16
C5
C13
C3
R2
R3
R1
C7
Q2
R4
R12
R13
C16
C10
R17
5V
Vout 3
3.3V
C4
C6
Q3
C11
R18
12
V12
1 Ct
C1
13 SS
C2
D4
15
D3
16
D2
17
D1
18
D0
19
PGd
6
Vfb2
4
5
V5
8
CS+
9
HDrv
7
CS-
11
LDrv
10
Gnd
14
Vfb3
Lin1 2
R7
R11
C15
Vfb1 3
Lin2
20
C9
R14
3004app2-2.0
Vout 1
12V
IRU3004
R8
Q4
C12
Vout 2
VID4
VID3
VID2
VID1
VID0
3.3V
R5
R9
C14
R15
Power Good
C8
Notes: Pentium III is trademark of Intel Corp.
PACKAGE ORDER INFORMATION
Ta (擄C)
0 TO 70
0 TO 70
Device
IRU3004CW
IRU3005CW
Package
20-pin Plastic SOIC WB
20-pin Plastic SOIC WB
2.5V Output Voltage
Adjustable
Fixed
Rev. 1.2
12/8/00
4-3

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