L4973D3.3 STMicroelectronics, L4973D3.3 Datasheet - Page 17

IC BUCK SYNC 3.3/ADJ 3.5A SOIC20

L4973D3.3

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

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

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L4973
Figure 25. Dropout voltage between pin
Figure 27. Efficiency vs. output voltage
(%)
0.6
0.4
0.2
ΔV
(V)
98
96
94
92
90
88
86
0
η
0
0
5
7,8 and 2,3
(Diode STPS745D)
1
10
100KHz
15
200KHz
2
20
Tj=125˚C
I
V
O
25
CC
= 3A
Tj=0˚C
3
= 35V
30
D97IN643
D97IN642
V
I
O
O
(A)
(V)
Figure 26. Efficiency vs. output voltage
Figure 28. Efficiency vs. output current
(%)
(%)
98
96
94
92
90
88
86
95
90
85
80
η
η
0
0
(see
(see
10
Vcc=24V
1
Vcc=12V
Figure
Figure
Vcc=48V
100KHz
200KHz
20
Typical characteristics
2
4)
7)
30
V
f
sw
O
I
V
O
CC
= 100KHz
= 5.1V
= 3A
3
= 50V
D97IN641
D97IN645
40
V
I
O
O
(A)
(V)
17/28

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