Datasheet

LT3970 Series
17
3970fc
Typical applicaTions
3.3V Step-Down Converter
V
IN
BOOST
LT3970
SWEN
PG
RT
C3
0.22µF
22pF
C2
22µF
C1
2.2µF
V
IN
4.2V TO 40V
V
OUT
3.3V
350mA
R1
1M
R2
576k
226k
f = 600kHz
L1
22µH
BD
FB
GND
OFF ON
3490 TA02
5V Step-Down Converter
2.5V Step-Down Converter
V
IN
BOOST
LT3970
SWEN
PG
RT
C3
0.22µF
22pF
226k
f = 600kHz
C2
22µF
C1
2.2µF
V
IN
6V TO 40V
V
OUT
5V
350mA
R1
1M
R2
316k
L1
22µH
BD
FB
GND
OFF ON
3490 TA03
V
IN
BOOST
LT3970
SWEN
PG
RT
C3
0.47µF
47pF
226k
f = 600kHz
C2
47µF
C1
2.2µF
V
IN
4.2V TO 40V
V
OUT
2.5V
350mA
R1
1M
R2
931k
L1
15µH
BD
FB
GND
OFF ON
3490 TA04
1.8V Step-Down Converter
V
IN
BOOST
LT3970
SWEN
BD
PG
RT
C3
0.22µF
47pF
226k
f = 600kHz
C2
47µF
C1
2.2µF
V
IN
4.2V TO 27V
V
OUT
1.8V
350mA
R1
487k
R2
1M
L1
10µH
FB
GND
OFF ON
3490 TA05
3.3V Step-Down Converter
5V Step-Down Converter
V
IN
BOOST
LT3970-3.3
SWEN
PG
RT
0.22µF
226k
f = 600kHz
22µF
2.2µF
V
IN
4.2V TO 40V
V
OUT
3.3V
350mA
22µH
BD
V
OUT
GND
OFF ON
3490 TA03a
V
IN
BOOST
LT3970-5
SWEN
PG
RT
0.22µF
226k
f = 600kHz
22µF
2.2µF
V
IN
6V TO 40V
V
OUT
5V
350mA
22µH
BD
V
OUT
GND
OFF ON
3490 TA03b