LTC1929C datasheet(5/24 Pages) LINER

5 / 24 page

LTC1929

PI FU CTIO S

FU CTIO AL DIAGRA

PGND (Pin 20): Driver Power Ground. Connects to sources

of bottom N-channel MOSFETS and the (–) terminals of

CIN.

INTVCC (Pin 21): Output of the Internal 5V Linear Low

Dropout Regulator and the EXTVCC Switch. The driver and

control circuits are powered from this voltage source.

Decouple to power ground with a 1

µF ceramic capacitor

placed directly adjacent to the IC and minimum of 4.7

µF

additional tantalum or other low ESR capacitor.

EXTVCC (Pin 22): External Power Input to an Internal

Switch . This switch closes and supplies INTVCC, bypass-

ing the internal low dropout regulator whenever EXTVCC is

higher than 4.7V. See EXTVCC Connection in the Applica-

tions Information section. Do not exceed 7V on this pin

and ensure VEXTVCC ≤ VINTVCC.

VIN (Pin 24): Main Supply Pin. Should be closely decoupled

to the IC’s signal ground pin.

SWITCH

LOGIC

0.8V

4.7V

VIN

CLK2

CLK1

–

VREF

INTERNAL

SUPPLY

EXTVCC

INTVCC

SGND

LDO

REG

SHDN

TOP

BOOST

CIN

PGND

BOT

INTVCC

VIN

VOUT

1929 FBD

EAIN

DROP

OUT

DET

RUN

SOFT

START

BOT

FORCE BOT

OSCILLATOR

PLLLPF

50k

0.86V

0.80V

VFB

1.2

µA

VIN

–

4(VFB)

SHDN

RUN/SS

ITH

CSS

4(VFB)

SLOPE

COMP

–

SENSE–

SENSE+

INTVCC

30k

45k

2.4V

45k

30k

AMPMD

DIFFOUT

0V POSITION

PHASE DET

PLLIN

DUPLICATE FOR

SECOND CHANNEL

–

RSENSE

COUT

VOS

–

FIN

RLP

CLP

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