Datasheet

LTC3857-1
33
38571fc
TYPICAL APPLICATIONS
High Efficiency Dual 24V/5V Step-Down Converter
SENSE1
+
SENSE1
–
SENSE2
–
SENSE2
+
V
FB1
I
TH1
SGND
EXTV
CC
RUN1
RUN2
FREQ
TRACK/SS2
V
FB2
TRACK/SS1
PLLIN/MODE
PGOOD1
BG1
SW1
BOOST1
TG1
V
IN
INTV
CC
PGND
TG2
BG2
BOOST2
SW2
C1
1nF
R
B1
487k
C
OUT2
: SANYO 10TPD150M
L1: SUMIDA CDR7D43MN
L2: SUMIDA CDEP105-4R3M
MTOP1, MTOP2, MBOT1, MBOT2: VISHAY Si7848DP
C
F1
18pF
C
ITH1A
100pF
C
SS1
0.01µF
C
SS2
0.01µF
C
ITH1
680pF
C
INT
4.7µF
C
B1
0.47µF
C
B2
0.47µF
D1
V
IN
28V TO 38V
D2
LTC3857-1
L1
22µH
L2
4.3µH
R
SENSE1
25m
R
SENSE2
6m
MBOT1
MTOP2
MTOP1
MBOT2
38571 TA04
100k
INTV
CC
C
OUT1
22µF
25V
s2
CERAMIC
V
OUT1
24V
1A
V
OUT2
5V
5A
C
IN
22µF
C
OUT2
150µF
R
A1
16.9k
R
A2
75k
R
B2
392k
C
F2
15pF
R
FREQ
60k
R
ITH1
46k
C2
1nF
I
TH2
C
ITH2
680pF
C
ITH2A
100pF
R
ITH2
17k