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SC283 Datasheet(PDF) 16 Page - Semtech Corporation

Part # SC283
Description  Dual Channel 2.5MHz, 1.8A Synchronous Step-Down Regulator
PDF  20 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC283 Datasheet(HTML) 16 Page - Semtech Corporation

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SC283
© 2010 Semtech Corp.
Applications Information (continued)
To estimate the required input capacitor, determine the
acceptable input ripple voltage and calculate the
minimum value required for C
IN from Equation 6.
OSC
OUT
IN
OUT
IN
OUT
IN
f
ESR
I
V
V
V
V
V
C
⋅


−
∆


−
=
1
(6)
The input capacitor RMS ripple current varies with the
input and output voltage. The maximum input capacitor
RMS current is found from Equation 7.


−
=
IN
OUT
IN
OUT
RMS
CIN
V
V
V
V
I
1
)
(
(7)
The input voltage ripple and RMS current ripple are at
a maximum when the input voltage is twice the output
voltage or 50% duty cycle.
The input capacitor provides a low impedance loop for
the edges of pulsed current drawn by the PMOS switch.
Low ESR/ESL X5R ceramic capacitors are recommended
for this function. To minimise stray inductance ,the
capacitor should be placed as closely as possible to the
VIN and GND pins of the SC283.
www.semtech.com
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