ISL62386 Datasheet, PDF (19/20 Pages) Intersil Corporation – High-Efficiency, Quad Output System Power Supply Controller for Notebook Computers

ISL62386
LGATE (Pins 18 and 23)
The signal going through these traces are both high dv/dt
and high di/dt, with high peak charging and discharging
current. Route these traces in parallel with the trace from the
PGND pin. These two traces should be short, wide, and
away from other traces. There should be no other weak
signal traces in proximity with these traces on any layer.
BOOT (Pins 17 and 24), UGATE (Pins 16 and 25), and
PHASE (Pins 15 and 26)
The signals going through these traces are both high dv/dt
and high di/dt, with high peak charging and discharging
current. Route the UGATE and PHASE pins in parallel with
short and wide traces. There should be no other weak signal
traces in proximity with these traces on any layer.
Copper Size for the Phase Node
The parasitic capacitance and parasitic inductance of the
phase node should be kept very low to minimize ringing. It is
best to limit the size of the PHASE node copper in strict
accordance with the current and thermal management of the
application. An MLCC should be connected directly across
the drain of the upper MOSFET and the source of the lower
MOSFET to suppress the turn-off voltage spike.
19
FN6831.0
February 4, 2009