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| LTC3858_15 Datasheet, PDF (31/38 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller | |||
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TYPICAL APPLICATIONS
High Efï¬ciency Dual 2.5V/3.3V Step-Down Converter
LTC3858
RB1
143k
CF1
22pF C1
RA1
1nF
68.1k
CITH1A 100pF
LTC3858
SENSE1+ PGOOD2
SENSE1â
VFB1
PGOOD1
BG1
SW1
RITH1 22k
ITH1
BOOST1
TG1
CITH1 820pF CSS1 0.01μF
CSS2 0.01μF
SS1
ILIM
PHASMD
CLKOUT
PLLIN/MODE
SGND
EXTVCC
RUN1
RUN2
FREQ
VIN
INTVCC
PGND
TG2
BOOST2
SS2
CITH2 820pF RITH2 15k
ITH2
SW2
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 10TPD150M
L1: SUMIDA CDEP105-2R5
L2: SUMIDA CDEP105-3R2M
MTOP1, MTOP2, MBOT1, MBOT2: VISHAY Si7848DP
MBOT1
L1
2.4μH
MTOP1
RSENSE1
7mΩ
VIN
CIN 4V TO 38V
22μF
COUT1
150μF
VOUT1
2.5V
5A
MTOP2
L2
RSENSE2
3.2μH 7mΩ
MBOT2
VOUT2
3.3V
COUT2 5A
150μF
3858 F13
3858fc
31
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