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PDF IRU3011 Data sheet ( Hoja de datos )
| Número de pieza | IRU3011 | |
| Descripción | 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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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
R1
R2
Q1
Note: Pentium II and Pentium III are trade marks of Intel Corp.
Q2
R3
C8
R4
L2
C10
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/
Boot
CS-
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
R7
R9
C12
R8
C13
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
1
1 page  
BLOCK DIAGRAM
V12 18
V5 9
D0 4
D1 5
D2 6
D3 7
D4 8
Enable
UVLO
Vset
Enable
5Bit
DAC,
Ctrl
Logic
OVP 19
1.18Vset
Gnd 16
IRU3011
Vset
+
Slope
Comp
Enable
PWM
Control
Osc
V12
V12
Soft
Start &
Fault
Logic
Enable
Over
Current
200uA
1.1Vset
10 VFB
14 HDrv
17 LDrv
13 CS-
2 CS+
20 Ct
3 SS
12 PGd
0.9Vset
Figure 2 - Simplified block diagram of the IRU3011.
Rev. 1.6
08/20/02
www.irf.com
5
5 Page 
IRU3011
Switcher External Shutdown
The best way to shutdown the part is to pull down on the
soft-start pin using an external small signal transistor
such as 2N3904 or 2N7002 small signal MOSFET. This
allows slow ramp up of the output, the same as the power
up.
Layout Considerations
Switching regulators require careful attention to the lay-
out of the components, specifically power components
since they switch large currents. These switching com-
ponents can create large amount of voltage spikes and
high frequency harmonics if some of the critical compo-
nents are far away from each other and are connected
with inductive traces. The following is a guideline of how
to place the critical components and the connections
between them in order to minimize the above issues.
Start the layout by first placing the power components:
7) If the output voltage is to be adjusted, place resistor
dividers close to the feedback pin.
Note: Although, the device does not require resistor
dividers and the feedback pin can be directly con-
nected to the output, they can be used to set the
outputs slightly higher to account for any output drop
at the load due to the trace resistance. See the ap-
plication note.
8) Place timing capacitor C7 close to pin 20 and soft-
start capacitor C2 close to pin 3.
Component connections:
Note: It is extremely important that no data bus should
be passing through the switching regulator section spe-
cifically close to the fast transition nodes such as PWM
drives or the inductor voltage.
1) Place the input capacitors C3 and the high side Using 4 layer board, dedicate on layer to Gnd, another
MOSFET, Q1 as close to each other as possible layer as the power layer for the 5V, 3.3V and Vcore.
2) Place the synchronous MOSFETs, Q2 and the Q1
as close to each other as possible with the intention
that the connection from the source of Q1 and the
drain of the Q2 has the shortest length.
3) Place the snubber R4 & C7 between Q1 & Q2.
Connect all grounds to the ground plane using direct
vias to the ground plane.
Use large low inductance/low impedance plane to con-
nect the following connections either using component
side or the solder side.
4) Place the output inductor, L2 and the output capaci-
tors, C10 between the MOSFET and the load with
output capacitors distributed along the slot 1 and
close to it.
5) Place the bypass capacitors, C6 and C9 right next to
12V and 5V pins. C6 next to the 12V, pin 18 and C9
next to the 5V, pin 9.
6) Place the IC such that the PWM output drives, pins
14 and 17 are relatively short distance from gates of
Q1 and Q2.
a) C3 to Q1 Drain
b) Q1 Source to Q2 Drain
c) Q2 drain to L2
d) L2 to the output capacitors, C10
e) C10 to the slot 1
f) Input filter L1 to the C3
Connect the rest of the components using the shortest
connection possible.
Rev. 1.6
08/20/02
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information
Data and specifications subject to change without notice. 02/01
www.irf.com
11
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