ISL78229 Datasheet, PDF (69/71 Pages) Intersil Corporation – 2-Phase Boost Controller with Drivers

ISL78229
Assuming the R_SENx is placed in the top layer (red), route one
current sense connection from the middle of one R_SENx pad in
the top layer under the resistor (red trace). For the other current
sensing trace, from the middle of the other pad on R_SENx in top
layer, after a short distance, via down to the second layer and
route this trace right under the top layer current sense trace.
13. Keep the current sensing traces far from the noisy traces like
gate driving traces (LGx, UGx and PHx), phase nodes in power
stage, BOOTx signals, output switching pulse currents, driving
bias traces and input inductor ripple current signals, etc.
FIGURE 78. RECOMMENDED LAYOUT PATTERN FOR CURRENT
SENSE TRACES REGULATOR
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FN8656.3
February 12, 2016