SC196 datasheet(11/18 Pages) SEMTECH

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PCB Layout Considerations

Poor layout can degrade the performance of the DC-DC

converter and can contribute to EMI problems, ground

bounce and resistive voltage losses. Poor regulation and

instability can result.

A few simple design rules can be implemented to ensure

good layout:

Place the inductor and ﬁlter capacitors as close to the

device as possible and use short wide traces between

the power components.

Route the output voltage feedback path away from the

inductor and LX node to minimize noise and magnetic

interference. Keep R

FB1 and RFB2 close to the ADJ pin

to avoid noise pickup.

Maximize ground metal on the component side to

improve the return connection and thermal dissipation.

Separation between the LX node and GND should be

maintained to avoid coupling of switching noise to the

ground plane.

Use a ground plane with several vias connecting to

the component side ground to further reduce noise

interference on sensitive circuit nodes.

GND

VIN

COUT

GND

CIN

SC196

VOUT

LOUT

SYNC/PWM

MODE

RFB2

RFB1

GND

CFB1

Applications Information (Cont.)

www.semtech.com

SC196

PRELIMINARY

POWER MANAGEMENT

SC196 Datasheet(PDF) 11 Page - Semtech Corporation

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