Datasheet

LT3973/LT3973-3.3/LT3973-5
19
3973fa
12V Step-Down Converter 5V, 2MHz Step-Down Converter
Typical applicaTions
3.3V Step-Down Converter 5V Step-Down Converter
2.5V Step-Down Converter 1.8V Step-Down Converter
3.3V Step-Down Converter 5V Step-Down Converter
V
IN
BOOST
LT3973
SWEN/UVLO
PG
RT
C3
0.47µF
15pF
C2
22µF
C1
4.7µF
V
IN
4.2V TO 42V
V
OUT
3.3V
750mA
1M
576k
215k
f = 600kHz
L1
15µH
BD
OUT
FB
GND
OFF ON
3973 TA02
V
IN
BOOST
LT3973
SWEN/UVLO
PG
RT
C3
0.47µF
15pF
215k
f = 600kHz
C2
22µF
C1
4.7µF
V
IN
5.6V TO 42V
V
OUT
5V
750mA
R1
1M
R2
316k
L1
15µH
BD
OUT
FB
GND
OFF ON
3973 TA03
V
IN
BOOST
LT3973-3.3
SWEN/UVLO
PG
RT
C3
0.47µF
215k
f = 600kHz
C2
22µF
C1
4.7µF
V
IN
4.2V TO 42V
V
OUT
3.3V
750mA
L1
15µH
BD
OUT
V
OUT
GND
OFF ON
3973 TA04
V
IN
BOOST
LT3973-5
SWEN/UVLO
PG
RT
C3
0.47µF
215k
f = 600kHz
C2
22µF
C1
4.7µF
V
IN
5.6V TO 42V
V
OUT
5V
750mA
L1
15µH
BD
OUT
V
OUT
GND
OFF ON
3973 TA05
V
IN
BOOST
LT3973
SWEN/UVLO
PG
RT
C3
1µF
22pF
215k
f = 600kHz
C2
47µF
C1
4.7µF
V
IN
4.2V TO 42V
V
OUT
2.5V
750mA
R1
1M
R2
931k
L1
10µH
BD
OUT
FB
GND
OFF ON
3973 TA06
V
IN
BOOST
LT3973
SW
OUT
EN/UVLO
BD
PG
RT
C3
0.47µF
22pF
215k
f = 600kHz
C2
47µF
C1
4.7µF
V
IN
4.2V TO 25V
V
OUT
1.8V
750mA
R1
487k
R2
1M
L1
10µH
FB
GND
OFF ON
3973 TA07
V
IN
BOOST
LT3973
SWEN/ULVO
PG
RT
C3
0.47µF
15pF
215k
f = 600kHz
C2
22µF
C1
4.7µF
V
IN
12.6V TO 42V
V
OUT
12V
750mA
R1
1M
R2
113k
L1
22µH
BD
OUT
FB
GND
OFF ON
3973 TA08
V
IN
BOOST
LT3973
SWEN/UVLO
PG
RT
43.2k
f = 2MHz
C3
0.47µF
10pF
C2
10µF
C1
2.2µF
V
IN
5.6V TO 28V
TRANSIENTS
TO 42V
V
OUT
5V
750mA
R1
1M
R2
316k
L1
10µH
BD
OUT
FB
GND
OFF ON
3973 TA09