sc2442 Semtech Corporation, sc2442 Datasheet - Page 8

• Manufacturer Part Number: sc2442
• Description: High Performance Wide Input Range Dual Synchronous Buck Controller
• Manufacturer: Semtech Corporation

Fig 2) Input and output rise times with full load
© 2007 Semtech Corp.
POWER MANAGEMENT
Application Information (Contd)
C16
C17
R11
J1-2
J1-3
15 uF
J1-1
C11
ENA
C10
15 uF
0.22 uF
VIN
0.1 uF
40.2K
Fig 1) Application Circuit for 5V to 3.3V/1.8V Low Power Dual Synchronous Buck Convertor
RTN
R9
TP1
R10
SS1
OSC
SS2
4.75-6V
C2
PVCC
C7
C8
R12
220K
C20
FB1
13
18
23
19
20
22
3
2
1
7
6
5
47 pF
10 nF
R1
R2
C22
C23
4.7 nF
VIN
BD I
AVCC
P VC C
S S 1
S S 2
ROS C
FB1
E A1
FB2
E A2
S YN C /E N
C18
10 nF
0.06R, 1/4W
0.075R, 1/4W
EA1
100R
U1
1.8V Output
3.3V Output
G D 1H
G D 2H
P G ND
AG ND
G D 1L
G D 2L
BS T 1
BS T 2
P H 1
P H 2
OC 1
OC 2
R3
OC2
OC1
R13
100K
100R
Input 5V
R4
4
21
9
11
16
14
10
8
15
17
12
24
C21
C19
10 nF
47 pF
D1
EA2
D2
8
PH1
BST1
PH2
BST2
FB2
R7
R6
R5
FDS6982S
FDS6982S
3.3R
2R
2R
QD1
QD2
R8
3.3R
C12
C13
Q B
Q B
•
•
8
1
8
1
2.2 uF
2.2 uF
•
•
7
2
7
2
•
•
•
•
6
3
6
3
5
4
5
4
Q T
Q T
TP2
1
1
L1
TP3
L2
RTN
100 uF 4V
100 uF 4V
R16
100R
1 nF
P1166.473T
RTN
P1166.223T
2
2
C24
R14
14K
R17
10K
C3
C4
1.8V/1A
3.3V/0.6A
VOUT1
VOUT2
C14
C15
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R18
34K
R15
10K
C25
100R
1 nF
R19
J2-1
J2-2
J2-4
J2-3