LT1578CS8 Ver la hoja de datos (PDF) - Linear Technology

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LT1578CS8

1.5A, 200kHz Step-Down Switching Regulator

Linear Technology 

LT1578/LT1578-2.5

APPLICATIONS INFORMATION

CONNECT OUTPUT

CAPACITOR DIRECTLY

TO HEAVY GROUND

TAKE OUTPUT DIRECTLY FROM END

OF OUTPUT CAPACITOR TO AVOID

PARASITIC RESISTANCE AND

INDUCTANCE (KELVIN CONNECTION)

MINIMIZE AREA

OF CONNECTIONS

TO SWITCH NODE

AND BOOST NODE

KEEP INPUT

CAPACITOR

AND CATCH

DIODE CLOSE

TO REGULATOR

AND TERMINATE

THEM TO THE

SAME POINT

C1

VOUT

L1

D2

C2

SW

D1

C3

VIN

BOOST

GND

SYNC

MINIMIZE SIZE

OF FEEDBACK PIN

CONNECTIONS

TO AVOID PICKUP

SHDN

FB

R2

R1 VC

CC

RC

GROUND RING NEED NOT BE AS SHOWN

(NORMALLY EXISTS AS INTERNAL PLANE)

GND

Figure 5. Suggested Layout for LT1578

SWITCH NODE

L1

5V

HIGH

FREQUENCY

VIN

CIRCULATING

PATH

LOAD

1578 F06

Figure 6. High Speed Switching Path

TERMINATE

FEEDBACK

RESISTORS AND

COMPENSATION

COMPONENTS

DIRECTLY TO

SWITCHER

GROUND PIN

1578 F05

16

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