IR3500VMPBF International Rectifier, IR3500VMPBF Datasheet - Page 30

• Manufacturer Part Number: IR3500VMPBF
• Description: The IR3500V Control IC combined with one or more xPhase3 Phase IC implement the control and MOSFET driver functions for a VR11.1 CPU VTT power supply.
• Manufacturer: International Rectifier

Specifications of IR3500VMPBF

• Package: 32-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 250kHz to 1.5MHz
• Pbf: PbF Option Available

PCB 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.
•
•
•
•
•
•
•
•
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 VCCL decoupling capacitor VCCL as close as possible to VCCL and LGND pins.
Place the following critical components on the same layer as control IC and position them as close as possible
to the respective pins, R
Place the compensation components on the same layer as control IC and position them as close as possible to
EAOUT, FB, VO 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.
Avoid analog control bus signals, VDAC, IIN, and especially EAOUT, crossing over the fast transition nodes.
Separate digital bus, CLKOUT, PHSOUT and PHSIN from the analog control bus and other compensation
components.
LGND
LGND
PLANE
PLANE
LGND
LGND
To
To
Page 30 of 34
C
C
VCCL
VCCL
R
R
To OVP
To OVP
Circuit
Circuit
VCCL2
VCCL2
R
R
VCCL1
VCCL1
R
R
VCCLDRV
VCCLDRV
Phase ICs
Phase ICs
To
To
To VIN
To VIN
OSC
C
C
VDAC
VDAC
, R
VCCLDRV
VCCLDRV
PHSOUT
PHSOUT
CLKOUT
CLKOUT
VCCLFB
VCCLFB
PHSIN
PHSIN
OCSET
VIDSEL
VIDSEL
VRRDY
VRRDY
VCCL
VCCL
R
R
OSC/OVP
OSC/OVP
R
R
VDAC
VDAC
LGND
LGND
VID7
VID7
, R
ROSC / OVP
ROSC / OVP
VID6
VID6
C
C
SS/DEL
SS/DEL
VDAC
SS/DEL
SS/DEL
VID5
VID5
, C
VDAC
VDAC
VID4 VID3 VID2
VID4 VID3 VID2
VDAC
To SYSTEM
To SYSTEM
OCSET
OCSET
VSETPT
VSETPT
, and C
IIN
IIN
VID1
VID1
VID0
VID0
VDRP
VDRP
SS/DEL
C
C
DRP
DRP
EAOUT
EAOUT
FB
FB
VO
VO
VOSNS+
VOSNS+
VOSNS -
VOSNS -
HOTSET
HOTSET
VRHOT
VRHOT
ENABLE
ENABLE
R
R
DRP
DRP
. Avoid using any via for the connection.
R
R
HOTSET2
HOTSET2
C
C
CP
CP
R
R
FB
FB
R
R
R
R
CP
CP
HOTSET1
HOTSET1
R
R
FB1
FB1
July 28, 2008
C
C
CP1
CP1
C
C
IR3500V
FB1
FB1
To Voltage
To Voltage
Remote
Remote
Sense
Sense
Thermistor
Thermistor
To VCCL
To VCCL
Phase
Phase
Thermistor
Thermistor
ICs
ICs
To
To
To
To
R
R
FB2
FB2
To
To