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SC600
POWER MANAGEMENT
Applications Information (Cont.)
where:
V O = output voltage
I O = output currrent
mode = 1.5x or 2x
V IN = input voltage
I Q = quiescent current
(from Electrical Characteristics on page 2)
The mode may be identi ? ed by measuring input current
and output current and calculating as mode = I IN /I OUT .
Alternately, the mode can be identi ? ed by identifying
the voltage at the bucket capacitor, CF1 with an
oscilloscope.
Calculating Power Dissipation
Short-Circuit and Over-Temperature Protection
The output current is limited to 600mA to protect against
short-circuit conditions. Over-temperature protection is
also provided.
Design and Layout Considerations
The layout example on page 15 uses the 1206 case size
for the capacitors, so a smaller layout area is possible.
The bucket capacitors and the SC600 are on the same
side of the card. To minimize trace inductance, traces are
short and wide with no vias to the bucket capacitors. The
input and output caps are on the bottom side directly un-
der the SC600 and vias are used to connect directly to
copper shapes used for the input and output. The input
and output capacitors and Pin 8 should be connected to
ground very near the SC600.
The power dissipated by the SC600 is calculated as,
P D = P IN - P OUT
P D = V IN · (mode I O + I Q ) - V O · I O
Suggested Capacitors
The following is a short list of some of the manufacturers
and types of multi-layer ceramic capacitors that are sug-
gested for the SC600.
M a n u f a c t u r e r
P a r t N u m b e r
C a p a c i t a n c e [ μ F ]
D i e l e c t r i c T y p e
E I A P a c k a g e S i z e
V o l t a g e
R a t i n g
A V X
A V X
A V X
P a n a s o n i c
P a n a s o n i c
P a n a s o n i c
P a n a s o n i c
T D K
T D K
T D K
0 8 0 5 Z C 2 2 5 K
0 8 0 5 Z C 1 0 5 K
0 8 0 5 Z C 3 3 4 K
E C J 2 Y B 0 J 2 2 5 K
E C J 2 Y B 1 A 1 0 5
E C J 1 V B 0 J 1 0 5 K
E C J 1 V B 0 J 3 3 4 K
C 1 6 0 8 X 5 R 1 A 1 0 5
C 1 2 0 2 Y 5 V 1 A 1 0 6 Z
C 1 6 0 8 X 5 R 1 A 3 3 4 k
2 . 2
1 . 0
0 . 3 3
2 . 2
1 . 0
1 . 0
0 . 3 3
1 . 0
1 . 0
0 . 3 3
X 7 R
X 7 R
X 7 R
X 5 R
X 7 R
X 5 R
X 5 R
X 5 R
X 5 R
X 5 R
0 8 0 5
0 8 0 5
0 8 0 5
0 8 0 5
0 8 0 5
0 4 0 2
0 6 0 3
0 6 0 3
0 8 0 5
0 6 0 3
1 0 V
1 0 V
1 0 V
6 . 3 V
1 0 V
6 . 3 V
6 . 3 V
1 0 V
1 0 V
1 0 V
? 2006 Semtech Corp.
12
www.semtech.com
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