Datasheet

LT3990
16
3990f
Typical applicaTions
3.3V Step-Down Converter
V
IN
BOOST
LT3990
SWEN/UVLO
PG
RT
C3
0.22µF
22pF
C2
22µF
C1
2.2µF
V
IN
4.2V TO 62V
V
OUT
3.3V
350mA
R1
1M
R2
576k
374k
f = 400kHz
L1
33µH
BD
FB
GND
OFF ON
3990 TA02
5V Step-Down Converter
2.5V Step-Down Converter
V
IN
BOOST
LT3990
SWEN/UVLO
PG
RT
C3
0.22µF
22pF
374k
f = 400kHz
C2
22µF
C1
2.2µF
V
IN
6.5V TO 62V
V
OUT
5V
350mA
R1
1M
R2
316k
L1
33µH
BD
FB
GND
OFF ON
3990 TA03
V
IN
BOOST
LT3990
SWEN/UVLO
PG
RT
C3
0.47µF
47pF
511k
f = 300kHz
C2
47µF
C1
2.2µF
V
IN
4.2V TO 62V
V
OUT
2.5V
350mA
R1
1M
R2
931k
L1
33µH
BD
FB
GND
OFF ON
3990 TA04
1.8V Step-Down Converter
V
IN
BOOST
LT3990
SWEN/UVLO
BD
PG
RT
C3
0.22µF
47pF
374k
f = 400kHz
C2
47µF
C1
2.2µF
V
IN
4.2V TO 30V
V
OUT
1.8V
350mA
R1
487k
R2
1M
L1
22µH
FB
GND
OFF ON
3990 TA05