Datasheet

LTC3890-3
37
38903f
For more information www.linear.com/3890-3
Typical applicaTions
12V SEPIC and 3.3V Step-Down Converter
MTOP2
SENSE1
+
SENSE1
–
V
FB1
TRACK/SS2
ITH2
V
FB2
SENSE2
–
SENSE2
+
ITH1
TRACK/SS1
PLLIN/MODE
SGND
EXTV
CC
RUN1
RUN2
FREQ
PGOOD1
BG1
C
ITH1A
47pF
C
ITH1
10nF
C
SS2
0.01µF
C
ITH2A
47pF
C
SS1
0.01µF
C
ITH2
4.7nF
C1
100pF
R
A1
6.98k
R
B1
100k
R
ITH1
12.1k
R
B2
100k
R
FREQ
41.2k
R
ITH2
7.15k
M1, MBOT1, MBOT2: RJK0651DPB
L1: WÜRTH 7448709100
L2: WÜRTH 7443320330
C
OUT1
: SANYO 16TQC68M
C
OUT2
: SANYO 6TPE470M
D1: DFLS1100
D2: PDS560
D1
LTC3890-3
R
SENSE2
4mΩ
L2
3.3µH
M1
TG1
V
IN
5V TO 35V
38903 TA05a
INTV
CC
V
OUT1
V
OUT1
R
MODE
100k
R
A2
31.6k
SW1
V
OUT2
3.3V
10A
V
OUT1
12V
2A
SW2
BOOST1
C
B2
0.1µF
BOOST2
V
IN
INTV
CC
PGND
TG2
BG2
C
OUT2
470µF
C
INT
4.7µF
R
SNS1
6mΩ
MBOT2
C2
1nF
••
10µH10µH
L1
6.8µF
100Ω
D2
6.8µF
6.8µF
C
OUT
68µF
C
IN
100µF
2.2µF
x3
+