DC187A - Schematic

1
2
3
4
5
6
7
8
D2
3
A
5.5V - 25V
Input Range
A
MMBD914LT1
E1
D3
L1
6.8uH
DO3316P-682
C4
E5
VIN
1
VIN
1
1
3
.33uF
16V
optional
6
+
C3
10uF
50V
MARCON
VOUT
U1
LT1374CR
D1
C5
100uF
10V
AVX
3
+
+
R2
5.36K
1%
C7
optional
4
S/D
3
MBRD835L
VOUT
3.3V/4A
or
5V/4A
Output
3.3V / 5V LINK
B
VC
SD
SW
FB
7
R3
4.99K
1%
1
2
1
BOOST
S/D
VIN
GND
1
B
5
C6
0.47uF
25V
+
J1
4
E2
R4
2.74K
1%
1
E3
1
GND
R1
optional
C1
1500pF
50V
E4
1
C2
optional
GND
C
C
NOTES : unless otherwise specified
1. all resistors values in ohms , 1/8w , 5%
2. all components 1.8mm high
LINEAR TECHNOLOGY COPORATION
1630 McCARTHY BLVD.
MILPITAS, CA 95035
(408) 432-1900
(408) 434 - 0507 FAX
D
D
Title
4.5A, 500kHz Step-Down Switching Regulator
1
2
3
4
5
Size
A
Document Number
Date:
12-09-97
Rev
DC187A
6
LT1374CR
Sheet
7
1 of
1
8
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