L4973D3 STMICROELECTRONICS [STMicroelectronics], L4973D3 Datasheet - Page 13

• Manufacturer Part Number: L4973D3
• Description: 3.5A STEP DOWN SWITCHING REGULATOR
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Figure 33: 12V to 3.3V High Performance Buck Converter (f
Figure 34: Synchronization Example
Figure 35: Multioutput not Isolated (Pin out referred to DIP12+3+3)
560uF-25V
Panasonic
V
V
12V 5%
CC2
CC
HFQ
V
C1
CC
C1
L1
D1
V
P
O2
O2
1
KoolMm 77120- 24 Turns- 0.9mm
STPS1025
= V
< 20% P
R2
C2
220nF
L4973
13,14,15
C2
4,5,6
O1
7,8
1.2nF
33nF
22k
R2
C7
C3
C7
C3
n
O1
1
n
18
+ n
1
1uF
C4
2
C4
220pF
C5
C5
18
1
17
16
7,8
L4973
13,14,15
11
4,5,6
1
17
16
7,8
L4973V3.3
7,8
INH
10
22nF
9k1
R1
C6
11
D97IN668A
13,14,15
4,5,6
R1
C6
D97IN667A
1
SYNC
INH
18
10
L4973
13,14,15
4,5,6
12
2,3
9
SYNC
V
CC1
18
D1
12
L4973V3 - L4973V5 - L4973D3 - L4973D5
220nF
470uF-25V
Panasonic
2,3
C8
9
V
L1
HFQ
C9
CC
sw
= 200kHz)
C8
D1
Vo=3.33V
L1
Io=3.5A
1
L4973
13,14,15
4,5,6
n2
n1
7,8
C9
(%)
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)
18
D2
C10
18
1
C11
L4973
7,8
13,14,15
D97IN669
4,5,6
Vo2
Vo1
13/16