SC600 datasheet(12/19 Pages) SEMTECH

12 / 19 page

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POWER MANAGEMENT

SC600

Applications Information (Cont.)

where:

O = output voltage

O = output currrent

mode = 1.5x or 2x

IN = input voltage

Q = quiescent current

(from Electrical Characteristics on page 2)

The mode may be identiﬁed by measuring input current

and output current and calculating as mode = I

IN/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,

D = PIN - POUT

D = 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.

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.

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