ISL6252 Datasheet, PDF (23/25 Pages) Intersil Corporation – Highly Integrated Battery Charger Controller for Notebook Computers

.
HIGH
CURRENT
TRACE
SENSE
RREESSIISTOR
ISL6252, ISL6252A
HIGH
CURRENT
TRACE
KELVIN CONNECTION TRACES
TO THE LOW PASS FILTER
AND
CSOP AND CSON
FIGURE 25. CURRENT SENSE RESISTOR LAYOUT
EN Pin
This pin stays high at enable mode and low at idle mode and
is relatively robust. Enable signals should refer to the signal
ground.
DCIN Pin
This pin connects to AC adapter output voltage, and should
be less noise sensitive.
Copper Size for the Phase Node
The capacitance of PHASE should be kept very low to
minimize ringing. It would be best to limit the size of the
PHASE node copper in strict accordance with the current
and thermal management of the application.
Identify the Power and Signal Ground
The input and output capacitors of the converters, the source
terminal of the bottom switching MOSFET PGND should
connect to the power ground. The other components should
connect to signal ground. Signal and power ground are tied
together at one point.
Clamping Capacitor for Switching MOSFET
It is recommended that ceramic capacitors be used closely
connected to the drain of the high-side MOSFET, and the
source of the low-side MOSFET. This capacitor reduces the
noise and the power loss of the MOSFET.
23
FN6498.3
August 25, 2010