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LTC1149CS Datasheet(PDF) 18 Page - Linear Technology

Part # LTC1149CS
Description  High Efficiency Synchronous Step-Down Switching Regulators
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1149CS Datasheet(HTML) 18 Page - Linear Technology

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



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