Datasheet

LTC3891
28
3891fa
Figure 12. High Efficiency 3.3V Step-Down Converter
0.1µF
C
IN
22µF
V
IN
4V TO 60V
INTV
CC
41.2k
10k
2200pF
100k
100k
31.6k
3891 F12
2.2µF
D1
100pF
0.1µF
FREQ
ITH
SGND
SGND
LTC3891
V
IN
PGOOD
RUN
I
LIM
EXTV
CC
PLLIN/MODE
INTV
CC
PGND
L1
4.7µH
R
SENSE
8mΩ
BOOST
SW
BG
SENSE
+
SENSE
–
V
FB
TG
MTOP
MBOT
1nF
C
OUT
150µF
V
OUT
3.3V
5A
TRACK/SS
MTOP, MBOT: Si7850DP
L1 COILCRAFT SER1360-472KL
C
OUT
: SANYO 6TPE470M
D1: DFLS1100
Figure 13. High Efficiency 12V Step-Down Converter
0.1µF
C
IN
22µF
V
IN
12.5V TO 60V
V
OUT
INTV
CC
34.8k
470pF
100k
100k
MTOP, MBOT: BSC100N06LS3
L1 COILCRAFT SER1360-802KL
C
OUT
: SANYO 16SVP180MX
D1: DFLS1100
6.98k
3891 F13
2.2µF
D1
100pF
0.1µF
FREQ
ITH
SGND
SGND
LTC3891
V
IN
PGOOD
RUN
I
LIM
EXTV
CC
PLLIN/MODE
INTV
CC
PGND
L1
8µH
R
SENSE
9mΩ
BOOST
SW
BG
SENSE
+
SENSE
–
V
FB
TG
MTOP
MBOT
1nF
C
OUT
180µF
V
OUT
12V
3A
TRACK/SS
APPLICATIONS INFORMATION