RT9703_07 Datasheet, PDF (13/14 Pages) Richtek Technology Corporation – 80mΩ, 3A Smart Universal Power Switch with Flag

Fault Flag Filtering (Optional)
The transient inrush current to downstream capacitance
may cause a short-duration error flag, which may cause
erroneous over-current reporting. A simple 1ms RC low-
pass filter (10kΩ and 0.1μF) in the flag line eliminates
short-duration transients.
PCB Layout
In order to meet the voltage drop, droop, and EMI
requirements, careful PCB layout is necessary. The
following guidelines must be considered:
z Keep all input and output traces as short as possible
and use at least 150-mil & 2 ounce copper for all races.
z Avoid vias as much as possible. If vias are necessary,
make them as large as feasible.
z Place a ground plane under all circuitry to lower both
resistance and inductance and improve DC and transient
performance (Use a separate ground and power plans
if possible).
z Locate the bypass capacitors as close as possible to
the input and output pin of the RT9703.
RT9703
IP
FLG
VOUT
GND
VIN
EN
GND
Board Layout
GND
DS9703-08 March 2007
www.richtek.com
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