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| LTC3857-1_15 Datasheet, PDF (31/38 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller | |||
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TYPICAL APPLICATIONS
High Efficiency Dual 2.5V/3.3V Step-Down Converter
LTC3857-1
RB1
144k
CF1
22pF C1
RA1
1nF
68.1k
CITH1A 100pF
LTC3857-1
SENSE1+
SENSE1â
VFB1
PGOOD1
BG1
SW1
RITH1 22k
ITH1
BOOST1
TG1
CITH1 820pF CSS1 0.01μF
TRACK/SS1
VIN
INTVCC
CITH2 820pF
CSS2 0.01μF
PLLIN/MODE
SGND
EXTVCC
RUN1
RUN2
FREQ
PGND
TG2
BOOST2
TRACK/SS2
SW2
RITH2 15k
ITH2
BG2
INTVCC
100k
CB1
0.47μF
D1
CINT
4.7μF
D2
CB2
0.47μF
RA2
68.1k
CITH2A 150pF
C2
CF2 1nF
15pF
VFB2
SENSE2â
SENSE2+
RB2
215k
COUT1, COUT2: SANYO 4TPE150M
D1, D2: CENTRAL SEMI CMDSH-4E
L1: SUMIDA CDEP105-2R5
L2: SUMIDA CDEP105-3R2M
MTOP1, MTOP2, MBOT1, MBOT2: VISHAY Si7848DP
MBOT1
L1
2.4μH
MTOP1
RSENSE1
6mΩ
VIN
CIN 4V TO 38V
22μF
COUT1
150μF
VOUT1
2.5V
5A
MTOP2
L2
RSENSE2
3.2μH 6mΩ
MBOT2
VOUT2
3.3V
COUT2 5A
150μF
38571 TA02
38571fc
31
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