LTC3857 Datasheet, PDF(30/38 Page) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

LTC3857 Datasheet, PDF (30/38 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

◁

LTC3857

Applications Information

RB1

215k

CF1

15pF C1

RA1

1nF

68.1k

CITH1A 150pF

RITH1 15k

CITH1 820pF CSS1 0.1ÂµF

CSS2 0.1ÂµF

CITH2 680pF RITH2 27k

LTC3857

SENSE1+ PGOOD2

SENSE1â

VFB1

ITH1

PGOOD1

BG1

SW1

BOOST1

TG1

TRACK/SS1

ILIM

PHSMD

CLKOUT

PLLIN/MODE

SGND

EXTVCC

RUN1

RUN2

FREQ

VIN

INTVCC

PGND

TG2

BOOST2

TRACK/SS2

SW2

ITH2

BG2

INTVCC

100k

CB1

0.47ÂµF

CINT

4.7ÂµF

CB2

0.47ÂµF

MBOT1

3.3ÂµH

MTOP1

RSENSE1

6mÎ©

VIN

CIN 9V TO 38V

22ÂµF

COUT1

150ÂµF

VOUT1

3.3V

MTOP2

RSENSE2

7.2ÂµH 8mÎ©

MBOT2

VOUT2

8.5V

COUT2 3A

150ÂµF

RA2

44.2k

CITH2A 100pF

CF2 1nF

39pF

VFB2

SENSE2â

SENSE2+

RB2

422k

COUT1, COUT2: SANYO 10TPD150M

D1, D2: CENTRAL SEMI CMDSH-4E

L1: SUMIDA CDEP105-3R2M

L2: SUMIDA CDEP105-7R2M

MTOP1, MTOP2, MBOT1, MBOT2: VISHAY Si7848DP

3857 F13

Figure 13. High Efficiency Dual 3.3V/8.5V Step-Down Converter

3857fa

▷