SC2604EVB SEMTECH [Semtech Corporation], SC2604EVB Datasheet - Page 11

• Manufacturer Part Number: SC2604EVB
• Description: Simple PWM Boost Controller with Input Disconnect FET Drive
• Manufacturer: SEMTECH [Semtech Corporation]

lower ground injection currents, resulting in electrically
“cleaner” grounds for the rest of the system and minimize
source ringing, resulting in more reliable gate switching
signals.
3) The connection between the junction of Q
output capacitor should be a wide trace or copper region.
It should be as short as practical. Since this connection
has fast voltage transitions, keeping this connection short
will minimize EMI.
4) The Output Capacitor(s) (C
close to the load as possible, fast transient load currents
are supplied by C
and the load must be short, wide copper areas to minimize
inductance and resistance.
© 2007 Semtech Corp.
Applications Information (Cont.)
OUT
only, and connections between C
Note: Heavy lines indicate the critical loop carrying high pulsating current.
The inductance of the loop needs to be minimized.
OUT
) should be located as
Figure 4. SC2604 Layout Diagram

, D

and the
OUT
5) The SC2604 is best placed over an isolated ground
plane area. The soft-start capacitor and the Vin decoupling
capacitor should also connected to this ground pad
area. This isolated ground area should be connected to
the main ground by a trace that runs from the GND pin
to the ground side of the output capacitor. If this is not
possible, the GND pin may be connected to the ground
path between the Output Capacitor and the C
loop. Under no circumstances should GND be returned to
a ground inside the C
6) Input voltage of the SC2604 should be supplied from
the power rail through a Ω resistor, the Vin pin should
be decoupled directly to GND by a 0.µF~µF ceramic
capacitor, trace lengths should be as short as possible.
IN
, Q

, D

loop.
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SC2604
IN
, Q

, D