LTC3890
Typical applicaTions
12V SEPIC and 3.3V Step-Down Converter
1k
2k
2k
L1
INTV
CC
• •
10µH
10µH
6.8µF
0.1µF
R
B1
+
SENSE1
SENSE1
PGOOD1
PGOOD2
6.8µF
D2
100k
V
12V
2A
C1
1nF
OUT1
V
OUT1
511Ω
–
R
A1
C
OUT
M1
TG1
BG1
6.8µF
6.98k
68µF
V
FB1
511Ω
C
ITH1A
47pF
R
SNS1
6mΩ
R
12.1k
ITH1
SW1
BOOST1
ITH1
C
SS1
0.01µF
C
ITH1
C
LTC3890
TRACK/SS1
B1
0.1µF
10nF
I
LIM
V
IN
PHSMD
CLKOUT
PLLIN/MODE
V
IN
R
MODE
5V TO 35V
100k
C
IN
INTV
INTV
CC
CC
100µF
C
INT
SGND
4.7µF
PGND
V
EXTV
CC
OUT1
RUN1
RUN2
FREQ
R
FREQ
D1
41.2k
TG2
MTOP2
C
SS2
C
0.1µF
B2
0.01µF
L2
3.3µH
R
BOOST2
SW2
SENSE2
4mΩ
TRACK/SS2
ITH2
V
3.3V
10A
OUT2
R
ITH2
7.15k
C
4.7nF
ITH2
C
MBOT2
OUT2
BG2
470µF
C
47pF
ITH2A
V
FB2
R
A2
–
+
SENSE2
31.6k
C2
1nF
R
B2
100k
SENSE2
3890 TA06
M1, MBOT1, MBOT2: RJK0651DPB
L1: WÜRTH 7448709100
L2: WÜRTH 7443320330
C
C
: SANYO 16TQC68M
: SANYO 6TPE470M
OUT1
OUT2
D1: DFLS1100
D2: PDS560
3890fb
36
Linear Systems [ Linear Systems ]
