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| LTC3857-1_15 Datasheet, PDF (30/38 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller | |||
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LTC3857-1
TYPICAL APPLICATIONS
RB1
215k
CF1
15pF C1
RA1
1nF
68.1k
CITH1A 150pF
RITH1 15k
CITH1 820pF CSS1 0.1μF
CSS2 0.1μF
CITH2 680pF RITH2 27k
LTC3857-1
SENSE1+
SENSE1â
VFB1
ITH1
PGOOD1
BG1
SW1
BOOST1
TG1
TRACK/SS1
VIN
INTVCC
PLLIN/MODE
SGND
EXTVCC
RUN1
RUN2
FREQ
PGND
TG2
BOOST2
TRACK/SS2
SW2
ITH2
BG2
INTVCC
100k
CB1
0.47μF
D1
CINT
4.7μF
D2
CB2
0.47μF
MBOT1
L1
3.3μH
MTOP1
RSENSE1
6mΩ
VIN
CIN 9V TO 38V
22μF
COUT1
150μF
VOUT1
3.3V
5A
MTOP2
L2
RSENSE2
7.2μH 8mΩ
MBOT2
VOUT2
8.5V
COUT2 3A
150μF
RA2
44.2k
CITH2A 100pF
C2
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
38571 F12
Figure 13. High Efficiency Dual 3.3V/8.5V Step-Down Converter
38571fc
30
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