Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsPMICsPMIC - voltage regulators - DC DC switch controllers QFN 38

LTC3859

38

3859fa

TYPICAL APPLICATIONS

Figure 15. High Efﬁ ciency 1.2V/3.3V Step-Down Converter with 10.5V SEPIC Converter

3859 F15

LTC3859

SENSE1

–

SENSE1

+

PGOOD1

TG1

SW1

BOOST1

BG1

V

BIAS

PGND

EXTV

CC

INTV

CC

TG2

BOOST2

SW2

BG2

SENSE2

+

SENSE2

–

TG3

SW3

BOOST3

BG3

SENSE3

–

SENSE3

+

V

FB1

I

TH1

TRACK/SS1

FREQ

PLLIN/MODE

SGND

RUN1

RUN2

RUN3

V

FB2

I

TH2

TRACK/SS2

V

FB3

I

TH3

SS3

C1

1nF

100k

C

B1

0.1µF

D1

D2

C

BIAS

10µF

C

INT1

4.7µF

C2

1nF

MTOP1

MBOT1

C1

10µF

L1

2.2µH

R

SENSE1

9mΩ

C

OUT1

220µF

V

OUT1

1.2V

3A

MTOP2

MBOT2

C2

10µF

L2

6.5µH

R

SENSE2

9mΩ

C

OUT2

220µF

V

OUT2

3.3V

3A

C

B2

0.1µF

MBOT3

L3

10µH

D3

R

SENSE2

9mΩ

C3

1nF

C3

10µF

50V

C

IN

220µF

C

OUT3

270µF

R

B1

57.6k

V

OUT1

R

A1

115k

R

B2

357k

V

OUT2

R

A2

115k

C

ITH1A

100pF

C

ITH1

2.2nF

R

ITH1

5.6k

C

ITH2A

100pF

C

ITH2

3.3nF

C

SS2

0.1µF

R

ITH2

9.1k

R

B3

887k

V

OUT3

R

A3

115k

C

ITH3A

10pF

C

ITH3

100nF

C

SS3

0.1µF

R

ITH3

13k

C

SS1

0.1µF

MTOP1, MTOP2: BSZ097NO4LS

MBOT1, MBOT2: BSZ097NO4LS

MBOT3: BSZ097NO4L

L1: WURTH 744311220

L2: WURTH 744314650

L3: COOPER BUSSMANN DRQ125-100

C

OUT1

: SANYO 2R5TPE220MAFB

C

OUT2

: SANYO 4TPE220MAZB

C

OUT3

: SANYO SVPC270M

C

IN

: SANYO 50CE220LX

D1, D2: CMDH-4E

D3: DIODES INC B360A-13-F

V

OUT3

10.5V

1.2A

V

IN

5.8V TO 34V

••

OV3