Datasheet

LT3971/LT3971-3.3/LT3971-5
22
3971fd
2.5V Step-Down Converter
10pF
SW
FB
SS
RT
V
IN
V
IN
4.3V TO 38V
V
OUT
2.5V
1.2A
4.7µF
1µF
47µF
909k
118k
f = 400kHz
4.7µH
1M
GND
SYNC
OFF ON
LT3971
3971 TA04
EN BOOST
PG
BD
5V Step-Down Converter
SW
V
OUT
SS
RT
V
IN
V
IN
7V TO 38V
V
OUT
5V
1.2A
4.7µF
0.47µF
22µF
49.9k
f = 800kHz
4.7µH
GND
BD
SYNC
OFF ON
LT3971-5
3971 TA03
EN BOOST
PG
5V Step-Down Converter
SW
FB
SS
RT
V
IN
V
IN
7V TO 38V
V
OUT
5V
1.2A
4.7µF
0.47µF
22µF
10pF
309k
49.9k
f = 800kHz
4.7µH
1M
GND
BD
SYNC
OFF ON
LT3971
3971 TA02
EN BOOST
PG
TYPICAL APPLICATIONS
3.3V Step Down Converter No Load Supply Current
SW
FB
SS
RT
V
IN
V
IN
4.5V TO 38V
V
OUT
3.3V
1.2A
4.7µF
0.47µF
22µF
1M
49.9k
4.7µH
1.78M
GND
BD
SYNC
OFF ON
10pF
LT3971
3971 TA11
EN BOOST
PG
INPUT VOLTAGE (V)
0
INPUT CURRENT (µA)
1.0
10 20 30 40
3971 TA11b
2.0
1.5
4.0
3.5
3.0
2.5