SC2442/H
POWER MANAGEMENT
Application Information (Contd)
4.75-6V
0.075R, 1/4W
R1
VIN
J1-1
QD1
8
7
6
5
0.06R, 1/4W
R2
FDS6982S
TP 2
•
• •
C2
C7
R3 R4
3.3V/0.6A
P1166.473T
L1
100R
VOUT1
100R
1
2
J1-2
C8
•
QB
QT
10 nF
C22
3.3R
R7
C3
C14
1
2
3
4
OC1
J2-1
100 uF 4V
J1-3
C23
2R
R5
OC2
RTN
TP 1
10 nF
PVCC
J2-2
QD2
FDS6982S
8
7
6
5
D1
D2
TP 3
RTN
3
2
4
VIN
BDI
OC1
•
• •
U1
1.8V/1A
J2-4
L2
21
P1166.223T
C10
OC2
GD1H
GD1L
GD2H
GD2L
PH1
VOUT2
1
2
1
9
AVCC
PVCC
SS1
SS2
ROSC
FB1
•
QB
QT
C4
C15
13
7
11
16
14
10
8
15 uF R9
R10
J2-3
1
2
3
4
2R
R6
100 uF 4V
3.3R
R8
C11
18
23
6
RTN
PH1
C25
15 uF
C24
SS1
SS2
OSC
BST1
PH2
1 nF
1 nF
BST1
PH2
0.22 uF
C16
C12
2.2 uF
R18
5
15
17
12
24
R17
R16
R19
EA1
BST2
19
20
22
0.1 uF
C17
FB2
BST2
PGND
100R
34K
100R
14K
2.2 uF
C13
EA2
R11
40.2K
SYNC/EN AGND
R14
R15
10K
10K
ENA
47 pF
C21
47 pF
C20
R12
220K
EA1
EA2
R13
C19
C18
FB2
4.7 nF
100K
10 nF
FB1
Fig 1) Application Circuit for 5V to 3.3V/1.8V Low Power Dual Synchronous Buck Convertor
Input 5V
3.3V Output
1.8V Output
Fig 2) Input and output rise times with full load
© 2007 Semtech Corp.
8
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