SC1402(2001) View Datasheet(PDF) - Semtech Corporation
Part Name
Description
Manufacturer
SC1402
(Rev.:2001)
(Rev.:2001)
Semtech Corporation
SC1402 Datasheet PDF : 18 Pages
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SC1402
POWER MANAGEMENT
PCB Layout
As with any high frequency switching regulator it is advisable to practice a careful layout strategy. This includes
keeping loop area as small as possible. Properly decoupling lines that pull large amounts of current in short
periods of time. To keep loop area small always use a ground plane and if possible split the plane in two areas,
signal GND and power GND then tie the two together at one point. Be sure that high current paths have low
inductance by making track widths wide where possible.
Evaluation Board Schematic
VIN
VIN
1
GND C1
1
+
C2
+
GND
10U,30V 10U,30V
1
R1
10
C7
C8
4.7U,35V
0.22
D1
CMPSH-3A
C5
C6
4.7U,6.3V
0.1
VDD
C15
OPEN
OPEN
C
A
D3
VL
CMPD2838
D9
3
C10
C11
0.1
0.01
25
Q1
IR7413
27
C16
L1
10uH
0.1
26
D5C
Q3
24
140T3 IR7413
+5V1
2
+3.3V
1
D8 C
140T3
GND A
R11
3.32K
C21 C22 C23
OPEN 330U,10V 330U,10V
R20
301K
A
C26
0.1uF
1
R9 2
.02
3
10
23
7
1
GND
1
R13
10.7K
SHDN
JU9
C27
100pF
28
R14
R15 2M C24
R16 2M
R17 2M
0.01
2M
U1
22
21
V+
VL
BST3
DH3
SC1402ISS
LX3
DL3
CSH3
CSL3
FB3
PSAVE
SHDN
TIME/ON5
RUN/ON3
GND
8
C9
4.7U,16V
12OUT 4
VDD 5
BST5 18
DH5 16
LX5 17
DL5 19
PGND 20
CSH5 14
CSL5 13
FB5 12
SEQ 15
REF 9
SYNC 6
RESET 11
1
Q4
IR7413
REF
C30
0.1uF
ON5
R19
1
1k
C17
0.1
D6C
140T3
A
1 11
JP5 JP3
2 22
C25
4.7U,16V
C3
C4
++
10U,30V 10U,30V
C12 C13
0.1 0.01
Q2
IR7413
A
MCBRS1100
D4
910 T2/L72
C31
0.1uF
VDD
VDD
1
GND
1
VL
VL
1
+12V
JU2
1
RAW15V
1
C14
2.2U,25V
C28 12 TTI5834570
0.1uF R23
R8
301K
.02
R10
C18 C19 C20
10.7K
330U,10V OPEN
OPEN
+5V
+5V
1
C D7
140T3
A
GND
1
JP4
VL
R18
100K
C29
100pF
R12
JU7
10.7K
REF
REF
1
JP6
2
1
SYNC
1
GND
ON3
1
RESET
1
1
PSAVE
1
4321
S1
SW DIP-4
5678
VIN
VL
Title
SC1402 Eval Board
Size Document Number
B RTP00005
Date:
Thursday, April 13, 2000 Sheet
Rev
E
1 of 1
2001 Semtech Corp.
16
www.semtech.com
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