ltc1149-5 Linear Technology Corporation, ltc1149-5 Datasheet - Page 18

• Manufacturer Part Number: ltc1149-5
• Description: High Efficiency Synchronous Step-down Switching Regulators
• Manufacturer: Linear Technology Corporation

LTC1149
LTC1149-3.3/LTC1149-5
TYPICAL APPLICATIO S
18
+
1 F
+
3.3 F
48V
1N4148
V
0.047 F
390pF
IN
1k
1N4148
620pF
0.047 F
0.068 F
3300pF
**IRC LR2010-01-R050-G
Figure 15. Logic Selectable 5V/2A or 3.3V/2A High Efficiency Regulator
*COILTRONICS CTX50-2-MP
1k
1
2
3
4
5
6
7
8
0.068 F
3300pF
PGATE
V
V
PDRIVE
V
C
I
SENSE
TH
IN
CC
CC
T
Figure 14. High Efficiency 48V Input 5V/2.5A Output Regulator
–
U
LTC1149
**IRC LR2512-01-R040-G
*HURRICANE LAB HL-KI168M
1
2
3
4
5
6
7
8
PGATE
V
V
PDRIVE
V
C
I
SENSE
TH
IN
CC
CC
T
SENSE
SHDN2
NGATE
RGND
PGND
SGND
LTC1149-5
1N4148
CAP
–
V
FB
+
16
15
14
13
12
11
10
9
SENSE
SHDN2
SHDN1
NGATE
SHUTDOWN
RGND
PGND
SGND
1N4148
CAP
+
100pF
1000pF
8V TO 20V
16
15
14
13
12
11
10
9
V
IN
RFD15P05SM
RFD14N05SM
1000pF
SHUTDOWN
R1A
33k
1%
50 H
MTD2955
IRFZ34
L*
1N5818
68 H
R1B
43k
1%
L*
100
100
+
MBR380
R
0.05
100 F
35V
SENSE
56k
1%
R2
+
**
R
100 F
100V
0.04
SENSE
1149 F15
+
**
VN2222LL
220 F
10V 2
AVX
1149 F14
V
3.3V/2A
OR 5V/2A
OUT
+
0.1 F
220 F
10V
OS-CON
V
5V/2.5A
0V: V
5V: V
OUT
OUT
OUT
= 3.3V
= 5V