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Part Name
Description
LTC1148 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC1148
High Efficiency Synchronous Step-Down Switching Regulators
Linear Technology
'LTC1148' PDF : 20 Pages
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LTC1148
LTC1148-3.3/LTC1148-5
U
TYPICAL APPLICATIO S
Si9803DY
V
IN
5V
+
D1
MBRS140T3
C
IN
100
µ
F
20V
×
2
Si9804DY
0.1
µ
F
C
T
270pF
NPO
C
C
3300pF
R
C
470
Ω
1
14
P-DRIVE N-DRIVE
2
NC
NC
13
LTC1148-3.3
3
V
IN
PGND
12
4
C
T
SGND
11
*L
10
µ
H
5
10
INTV
CC
SHUTDOWN
SHUTDOWN
6
I
TH
NC
9
7
SENSE
–
SENSE
+
8
1000pF
*COILTRONICS CTX10-5P
**KRL SP-1-C1-0R020
+
R
SENSE
**
0.02
Ω
C
OUT
220
µ
F
10V
AVX
×
2
V
OUT
3.3V/4.5A
LTC1148 • F15
Figure 15. High Efficiency 5V to 3.3V/4.5A Converter
Si4435DY
V
IN
4V TO 14V
+
C
IN
100
µ
F
20V
V
OUT
1N4148
1
µ
F
C
T
390pF
C
C
3300pF
R
C
1k
1
14
P-DRIVE N-DRIVE
2
NC
13
NC
LTC1148
3
12
V
IN
PGND
4
C
T
SGND
11
5
INTV
CC
SHUTDOWN
10
SHUTDOWN
6
I
TH
9
V
FB
7
SENSE
–
SENSE
+
8
0.1
µ
F
L2
50
µ
H
220
µ
F*
10V
OS-CON
Si4412DY
R
SENSE
**
0.082
Ω
*LOW ESR REQUIRED
**KRL NP-1A-C1-0R082J
L1
50
µ
H
D1
R2
MBRS140T3
75k
1%
V
OUT
5V/1A
100pF
+
C
OUT
220
µ
F
10V
R1
OS-CON
25k
1%
LTC1148 • F16
Figure 16. 4V to 14V Input Voltage to 5V/1A Regulator with Current Foldback
18
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