LTC3839 Datasheet, PDF(39/50 Page) Linear Technology – Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller

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LTC3839 Datasheet, PDF (39/50 Pages) Linear Technology – Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller

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APPLICATIONS INFORMATION

CB2

VRNG SENSE2+ SENSE2â SGND RUN BOOST2 TG2 SW2

PHASMD

BG2

LOCALIZED

SGND TRACE

RITH1

CITH1

RITH2

CSS

MODE/PLLIN

CLKOUT

SGND

ITH

TRACK/SS

LTC3839

PGND

DRVCC2

EXTVCC

INTVCC

PGND

VIN

DRVCC1

VOUTSENSE+

BG1

VOUTSENSEâ SENSE1+ SENSE1â DTR PGOOD BOOST1 TG1 SW1

RFB1

RFB2

CB1

LTC3839

RSENSE2

MT2

MB2

DB2

CERAMIC

COUT2

VIN

CVIN RVIN

CIN

PGND

VOUT

CERAMIC

COUT1

DB1

MT1

MB1

RSENSE1

BOLD LINES INDICATE HIGH SWITCHING CURRENT KEEP LINES TO A MINIMUM LENGTH

3839 F14

Figure 14. Recommended PCB Layout Diagram

SW2

RSENSE2

VIN

RIN

CIN

COUT RLOAD

SW1

RSENSE1

3839 F15

BOLD LINES INDICATE

HIGH SWITCHING

CURRENT. KEEP LINES

TO A MINIMUM LENGTH.

Figure 15. Branch Current Waveforms

3839fa

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