L4973D3 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L4973D3' PDF : 16 Pages View PDF
L4973V3 - L4973V5 - L4973D3 - L4973D5
Figure 33: 12V to 3.3V High Performance Buck Converter (fsw = 200kHz)
VCC
12V±5%
C1
560uF-25V
HFQ
Panasonic
R2
22k
C7
1.2nF
C2
220nF C3
C4
33nF 1uF
INH
SYNC
7,8 10
18
9
1
17 L4973V3.3
16
11
4,5,6
13,14,15
2,3
12
C5
220pF
R1
D1
9k1
C6
22nF
C8
220nF
L1
C9
470uF-25V
HFQ
Panasonic
L1 KoolMm 77120- 24 Turns- 0.9mm
D1 STPS1025
D97IN668A
Vo=3.33V
Io=3.5A
η
(%)
92
90
88
86
84
82
80
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Io(A)
Figure 34: Synchronization Example
VCC2
7,8
1 L4973 18
4,5,6
13,14,15
7,8
18 L4973 1
4,5,6
13,14,15
VCC1
VCC
7,8
18
1 L4973
4,5,6
13,14,15
7,8
18
L4973
4,5,6
1 13,14,15
Figure 35: Multioutput not Isolated (Pin out referred to DIP12+3+3)
D97IN669
VCC
INH SYNC
R2
C8
D2
Vo2
7,8
10
18
9
1
17
L4973
n2
C1 C2 C7
16
4,5,6
2,3
L1
Vo1
11
13,14,15 12
n1
C3 C4 C5
R1
C6
D1
C9 C10
C11
VO2 = VO1 n1 + n2
n1
PO2 < 20% PO1
D97IN667A
13/16
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