ISL6277A Datasheet, PDF (37/38 Pages) Intersil Corporation – Multiphase PWM Regulator for AMD Fusion Mobile CPUs Using SVI 2.0

ISL6277A PIN
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ISL6277A
TABLE 14. LAYOUT CONSIDERATIONS FOR THE ISL6277A CONTROLLER (Continued)
SYMBOL
LAYOUT GUIDELINES
ISUMN_NB
ISUMP_NB
Place the current sensing circuit in general proximity of the controller.
Place capacitor Cn very close to the controller.
Place the NTC thermistor next to Core VR Channel 1 inductor so it senses the inductor temperature correctly.
Each phase of the power stage sends a pair of VSUMP and VSUMN signals to the controller. Run these two
signals traces in parallel fashion with decent width (>20mil).
IMPORTANT: Sense the inductor current by routing the sensing circuit to the inductor pads. If possible, route the
traces on a different layer from the inductor pad layer and use vias to connect the traces to the center of the
pads. If no via is allowed on the pad, consider routing the traces into the pads from the inside of the inductor.
The following drawings show the two preferred ways of routing current sensing traces.
INDUCTOR
INDUCTOR
VIAS
48
ISEN1_NB
CURRENT-SENSING TRACES
CURRENT-SENSING TRACES
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to the web to make sure that
you have the latest revision.
DATE
REVISION
CHANGE
Devember 19, 2012 FN8322.0 Initial Release
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Intersil Corporation is a leader in the design and manufacture of high-performance analog, mixed-signal and power management
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FN8322.0
December 19, 2012