Datasheet
16
LTC1149
LTC1149-3.3/LTC1149-5
TYPICAL APPLICATIO S
U
Figure 10. High Efficiency 8V to 20V Input 3.3V/1A Output Regulator
PGATE
V
IN
V
CC
P-DRIVE
V
CC
C
T
I
TH
SENSE
–
CAP
SHDN2
R-GND
NGATE
PGND
SGND
SHDN1
SENSE
+
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC1149-3.3
0.068µF
0.047µF
1N4148 1N4148
3300pF
1k
390pF1µF
1000pF
IRFR024 1N5818
100µF
35V
V
IN
8V TO 20V
L*
68µH
R
SENSE
**
0.1Ω
220µF
6.3V
AVX
1149 F10
V
OUT
3.3V/1A
*COILTRONICS CTX02-11932
**DALE WSC-1/2-0.1
IRFR9024
0V = NORMAL
>2V = SHUTDOWN
+
+
+
Figure 11. High Efficiency 8V to 20V Input 3.3V/3A Output Regulator
PGATE
V
IN
V
CC
PDRIVE
V
CC
C
T
I
TH
SENSE
–
CAP
SHDN2
RGND
NGATE
PGND
SGND
SHDN1
SENSE
+
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC1149-3.3
0.068µF
0.047µF
1N4148 1N4148
3300pF
1k
470pF3.3µF
1000pF
IRFZ34 1N5818
220µF
35V
V
IN
8V TO 20V
L*
33µH
R
SENSE
**
0.033Ω
220µF
6.3V × 2
AVX
1149 F11
V
OUT
3.3V/3A
*COILTRONICS CTX33-4-KM
**KRL SL-1-C1-0R033J
IRF9Z34
SHUTDOWN
100Ω
100Ω
+
+
+