SC600EVB Ver la hoja de datos (PDF) - Semtech Corporation
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Fabricante
SC600EVB Datasheet PDF : 19 Pages
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SC600
POWER MANAGEMENT
Applications Information (Cont.)
where:
Short-Circuit and Over-Temperature Protection
VO = output voltage
I = output currrent
O
mode = 1.5x or 2x
VIN = input voltage
IQ = quiescent current
The output current is limited to 600mA to protect against
short-circuit conditions. Over-temperature protection is
also provided.
Design and Layout Considerations
(from Electrical Characteristics on page 2)
The mode may be identified by measuring input current
and output current and calculating as mode = IIN/IOUT.
Alternately, the mode can be identified by identifying
the voltage at the bucket capacitor, CF1 with an
oscilloscope.
Calculating Power Dissipation
The power dissipated by the SC600 is calculated as,
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.
PD = PIN - POUT
PD = VIN · (mode IO + IQ) - VO · IO
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.
Manufacturer
Part Number Capacitance[μF] Dielectric Type
EIA Package Size
Voltage
Rating
AVX
0805ZC225K
2.2
X7R
0805
10V
AVX
0805ZC105K
1.0
X7R
0805
10V
AVX
0805ZC334K
0.33
X7R
0805
10V
Panasonic
ECJ2YB0J225K
2.2
X5R
0805
6.3V
Panasonic
ECJ2YB1A105
1.0
X7R
0805
10V
Panasonic
ECJ1VB0J105K
1.0
X5R
0402
6.3V
Panasonic
ECJ1VB0J334K
0.33
X5R
0603
6.3V
TDK
C1608X5R1A105
1.0
X5R
0603
10V
TDK
C1202Y5V1A106Z
1.0
X5R
0805
10V
TDK
C1608X5R1A334k
0.33
X5R
0603
10V
© 2006 Semtech Corp.
12
www.semtech.com
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