lt3990 Linear Technology Corporation, lt3990 Datasheet - Page 16

• Manufacturer Part Number: lt3990
• Description: 60v, 350ma Step-down Regulator With 2.5?a Quiescent Current And Integrated Diodes
• Manufacturer: Linear Technology Corporation

Typical applicaTions
LT3990

4.2V TO 60V
2.2µF
V
C1
IN
OFF ON
392k
f = 400kHz
3.3V Step-Down Converter
EN/UVLO
PG
RT
V
IN
LT3990
GND
BOOST
SW
BD
FB
4.2V TO 30V
4.2V TO 60V
2.2µF
2.2µF
V
C1
V
IN
C1
C3
0.22µF
22pF
IN
33µH
L1
OFF ON
OFF ON
536k
f = 300kHz
R1
1M
R2
576k
536k
f = 300kHz
3990 TA02
1.8V Step-Down Converter
2.5V Step-Down Converter
EN/UVLO
BD
PG
RT
V
EN/UVLO
PG
RT
V
IN
IN
LT3990
C2
22µF
V
3.3V
350mA
LT3990
GND
OUT
GND
BOOST
BOOST
SW
FB
SW
BD
FB
6.5V TO 60V
C3
0.22µF
47pF
2.2µF
15µH
C3
0.47µF
47pF
V
22µH
L1
C1
IN
L1
OFF ON
R1
487k
R2
1M
R1
1M
R2
931k
3990 TA05
3990 TA04
392k
f = 400kHz
5V Step-Down Converter
C2
47µF
EN/UVLO
PG
RT
V
1.8V
350mA
C2
47µF
V
V
2.5V
350mA
OUT
IN
OUT
LT3990
GND
BOOST
SW
BD
FB
C3
0.22µF
22pF
33µH
L1
R1
1M
R2
316k
3990 TA03
C2
22µF
V
5V
350mA
3990p
OUT