L4973D3.3 STMicroelectronics, L4973D3.3 Datasheet - Page 21

• Manufacturer Part Number: L4973D3.3
• Description: IC BUCK SYNC 3.3/ADJ 3.5A SOIC20
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4973D3.3

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3V, 0.5 ~ 50 V
• Current - Output: 3.5A
• Frequency - Switching: 100kHz ~ 300kHz
• Voltage - Input: 8 ~ 55 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Power - Output: 4W
• Output Voltage: 50 V
• Mounting Style: SMD/SMT
• For Use With: 497-4743 - BOARD EVAL FOR L4973X SW REG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L4973
8
Application ideas
Figure 41. 3.5 A at V
Figure 42. 12 V to 3.3 V high performance buck converter (fsw = 200 kHz)
560uF-25V
Panasonic
12V±5%
HFQ
V
V
C1
CC
CC
C1
L1
D1
STPS1025
KoolMm 77120- 24 Turns- 0.9mm
220nF
R2
C2
C2
1.2nF
33nF
22k
R2
C7
C3
C7
C3
1uF
C4
O
C5
< 3.3 V (see part list
220pF
C5
1
17
1
17
16
7,8
7,8
11
11
L4973V3.3
R1
C6
INH
10
22nF
9k1
R1
C6
D97IN668A
L4973V3.3
INH
10
13,14,15
4,5,6
D97IN666A
16
SYNC
18
C4
SYNC
R5
18
13,14,15
12
2,3
4,5,6
9
D1
Figure
2,3
12
9
220nF
470uF-25V
Panasonic
C8
L1
HFQ
C9
4)
D1
C8
Vo=3.33V
Io=3.5A
L1
1.5
2.5
3 x
C0
V
1
2
3
P
3.6K
4.7K
7.5K
5.1K
2K
R
(%)
92
90
88
86
84
82
80
η
5
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Io(A)
4.7K
3.6K
3.6K
2K
1K
Vo
R3
R
Application ideas
3
V
O
=3.36-1.74•
21/28
R
R
3
5