LTC1876 datasheet(30/36 Pages) LINER

30 / 36 page

LTC1876

1876fa

PC Board Layout Checklist

When laying out the printed circuit board, the following

checklist should be used to ensure proper operation of the

LTC1876. These items are also illustrated graphically in

the layout diagram of Figure 15. The Figure 16 illustrates

the current waveforms present in the various branches of

the 2-phase synchronous regulators operating in the

continuous mode. Check the following in your layout:

APPLICATIO S I FOR ATIO

1. Are the top N-channel MOSFETs M1 and M3 located

within 1cm of each other with a common drain connection

at CIN? Do not attempt to split the input decoupling for the

two channels as it can cause a large resonant loop.

2. Is the ground of the step-down controller kept separate

from the ground of the step-up regulator? The regulator

ground should join the controller ground at the combined

COUT (–) plates. Within the controller circuitry, are the

signal and power grounds kept separate? The controller

Figure 15. LTC1876 Recommended Printed Circuit Layout Diagram

CB1

CB2

CAUXIN

VPULL-UP

(<7V)

CINTVCC

CIN

CVIN

VIN

RIN

INTVCC

3.3V

RUN/SS1

SENSE1+

SENSE1–

VOSENSE1

FREQSET

STBYMD

FCB

ITH1

SGND

3.3VOUT

ITH2

VOSENSE2

SENSE2–

SENSE2+

AUXSGND

AUXVFB

AUXSW

PGOOD

TG1

SW1

BOOST1

VIN

BG1

EXTVCC

INTVCC

PGND

BG2

BOOST2

SW2

TG2

RUN/SS2

AUXSD

AUXVIN

AUXPGND

LTC1876

COUT1

VOUT1

VOUT2

1876 F15

COUT2

RSENSE

SHUTDOWN

VOUT3

COUT3

LTC1876 Datasheet(PDF) 30 Page - Linear Technology

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