Datasheet

LTC3862
35
3862fc
For more information www.linear.com/LTC3862
applicaTions inForMaTion
13. If an external RC filter is used between the sense
resistor and the SENSE
+
and SENSE
–
pins, these filter
components should be placed as close as possible to
the SENSE
+
and SENSE
–
pins of the IC. Ensure that
the SENSE
–
line is connected to the ground only at the
point where the current sense resistor is grounded.
14. Keep the MOSFET drain nodes (SW1, SW2) away
from sensitive small-signal nodes, especially from
the opposite channel’s current-sensing signals. The
SW nodes can have slew rates in excess of 1V/ns
relative to ground and should therefore be kept on
the “output side” of the LTC3862.
15. Check the stress on the power MOSFETs by inde
-
pendently measuring the drain-to-source voltages
directly across the devices terminals. Beware of
inductive ringing that could exceed the maximum
voltage rating of the MOSFET. If this ringing cannot
be avoided and exceeds the maximum rating of the
device, choose a higher voltage rated MOSFET or
consider using a snubber.
16. When synchronizing the LTC3862 to an external clock,
use a low impedance source such as a logic gate to
drive the SYNC pin and keep the lead as short as
possible.