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| LTC3857 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
RB1
143k
CF1
22pF C1
RA1
1nF
68.1k
CITH1A 100pF
LTC3857
SENSE1+ PGOOD2
SENSE1â
VFB1
PGOOD1
BG1
SW1
RITH1 22k
CITH1 820pF CSS1 0.01µF
CSS2 0.01µF
BOOST1
ITH1
TG1
TRACK/SS1
ILIM
PHSMD
CLKOUT
PLLIN/MODE
SGND
EXTVCC
RUN1
RUN2
FREQ
VIN
INTVCC
PGND
TG2
BOOST2
CITH2 820pF RITH2 15k
TRACK/SS2
SW2
ITH2
BG2
INTVCC
100k
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 4.5V TO 38V
22µF
COUT1
150µF
VOUT1
2.5V
5A
MTOP2
L2
RSENSE2
3.2µH 6mΩ
MBOT2
VOUT2
3.3V
COUT2 5A
150µF
3857 TA02
3857fa
31
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