SC2612C Semtech, SC2612C Datasheet - Page 8
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SC2612C
Manufacturer Part Number
SC2612C
Description
600kHz/200kHz Step-Down DC/DC Converter
Manufacturer
Semtech
Datasheet
1.SC2612C.pdf
(12 pages)
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Careful attention to layout requirements are necessary
for successful implementation of the SC2612 PWM con-
troller. High currents switching at high frequency are
present in the application and their effect on ground plane
voltage differentials must be understood and minimized.
1). The high power parts of the circuit should be laid out
first. A ground plane should be used, the number and
position of ground plane interruptions should be such as
to not unnecessarily compromise ground plane integrity.
Isolated or semi-isolated areas of the ground plane may
be deliberately introduced to constrain ground currents
to particular areas, for example the input capacitor and
bottom FET ground.
2). The loop formed by the Input Capacitor(s) (Cin), the
Top FET (Q1) and the Bottom FET (Q2) must be kept as
small as possible. This loop contains all the high current,
fast transition switching. Connections should be as wide
POWER MANAGEMENT
Layout Guidelines
2003 Semtech Corp.
0.1uF
10
4
1
2
5
U1
VCC
COMP
SS/EN
GND
SC2612
BST
DH
DL
FB
8
7
6
3
12V IN
10uF
8
GND
and as short as possible to minimize loop inductance.
Minimizing this loop area will a) reduce EMI, b) lower
ground injection currents, resulting in electrically “cleaner”
grounds for the rest of the system and c) minimize source
ringing, resulting in more reliable gate switching signals.
3). The connection between the junction of Q1, Q2 and
the output inductor should be a wide trace or copper
region. It should be as short as practical. Since this con-
nection has fast voltage transitions, keeping this con-
nection short will minimize EMI. The connection between
the output inductor and the output capacitors should be
a wide trace or copper area, there are no fast voltage or
current transitions in this connection and length is not
so important, however adding unnecessary impedance
will reduce efficiency.
Cin
Vin
Q1
Q2
L
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SC2612A/C
Cout
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Vout