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E-L4973D3.3-TR View Datasheet(PDF) - STMicroelectronics

Part NameDescriptionManufacturer
E-L4973D3.3-TR 3.5A step down switching regulator ST-Microelectronics
STMicroelectronics ST-Microelectronics
E-L4973D3.3-TR Datasheet PDF : 27 Pages
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L4973
5
Evaluation board
Evaluation board
Figure 4. Evaluation board circuit
VCC
R2
C1 C2 C7
(DIP18)
7,8
12
1
17 L4973
9
16
4,5,6 2,3
11 10 13,14,15
C3 C4 C5
R1
C6
C8 L1
3x
D1 C0
VO
R3
C12
R4
C1=1000µF/63V
C2=220nF/63V
C3=470nF
C4=1µF/50V
C5=220pF
C6=22nF
C7=2.7nF
C8=220nF/63V
C0=100µF/40V(C9,C10,C11)
C12=Optional (220nF)
L1=150µH KOOLµ 77310 - 40 Turns - 0.9mm
R1=9.1K
R2=20K
D1=STPS5L60
D97IN515C
L4973 V3.3
VO(V)
3.3
R3(K)
0
R4(K)
5.1
2.7
4.7
12
12
4.7
15
16
4.7
18
20
4.7
24
30
4.7
L4973 V5.1
VO(V)
5.1
R3(K)
0
R4(K)
12
6.2
4.7
15
9.1
4.7
18
12
4.7
24
18
4.7
Table 5. Typical performance (using evaluation board) fSW = 100kHz
Output voltage
Output
ripple
Line regulator
Load regulator
Efficiency Io = 3.5A VCC = 8 to 50V VCC =35V IO = 1 to 3.5A
3.3V
20mV
81.5 (%)
3mV
6mV
5.1V
20mV
86.7 (%)
3mV
6mV
12V
30mV
93.5 (%) 3mV (VCC =15 to 50V)
4mV
9/27
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