ir3084u International Rectifier Corp., ir3084u Datasheet - Page 43

• Manufacturer Part Number: ir3084u
• Description: Xphasetm Vr10, Vr11 & Opteron/athlon64 Control Ic
• Manufacturer: International Rectifier Corp.

LAYOUT GUIDELINES
The following layout guidelines are recommended to reduce the parasitic inductance and resistance of the PCB
layout, therefore minimizing the noise coupled to the IC.
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•
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Dedicate at least one middle layer for a ground plane LGND.
Connect the ground tab under the control IC to LGND plane through a via.
Place the following critical components on the same layer as control IC and position them as close as
possible to the respective pins, R
via for the connection.
Place the compensation components on the same layer as control IC and position them as close as possible
to EAOUT, FB and VDRP pins. Avoid using any via for the connection.
Use Kelvin connections for the remote voltage sense signals, VOSNS+ and VOSNS-, and avoid crossing
over the fast transition nodes, i.e. switching nodes, gate drive signals and bootstrap nodes.
Control bus signals, VDAC, RMPOUT, IIN, VBIAS, and especially EAOUT, should not cross over the fast
transition nodes.
Page 43 of 47
GND
GND
To VIN
LGND PLANE
R
R
C
VCC
REGSET
SS/DEL
C
VCC
REGDRV
REGSET
SS/DEL
VRRDY
ENABLE
REGFB
LGND
OSC
, R
OCSET
To SYSTEM
, R
VDAC
, C
VDAC
, C
VCC
VSETPT
OCSET
VDAC
ROSC
VOSNS-
VID0
VID1
, C
SS/DEL
and R
R
R
R
R
C
SETPT
OCSET
VDAC
OSC
VDAC
CC/DEL
Remote Sense
IR3084U
To Voltage
. Avoid using any
9/14/2005