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L4973D3.3 Datasheet(PDF) 18 Page - STMicroelectronics

Part # L4973D3.3
Description  3.5A step down switching regulator
PDF  27 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4973D3.3 Datasheet(HTML) 18 Page - STMicroelectronics

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Typical characteristics
L4973
18/27
Figure 35. Load transient
Figure 36. Line transient
Figure 37. Source current rise and fall
time, pin 2, 3 (see Figure 4)
Figure 38. Soft start capacitor selection
vs. inductor and VCC max (ref.
AN938)
1
2
IO
(A)
3
2
1
VO
(mV)
100
0
-100
D97IN649
T
T
200
µs/DIV
VCC = 35V
fsw = 100KHz
2
1
D97IN650
VCC
(V)
30
20
10
VO
(mV)
100
0
-100
1ms/DIV
IO = 1A
fsw = 100KHz
25
30
35
40
Vi(V)
50
45
0
50
100
150
Lomax
(
µH)
200
250
300
D97IN653
Css=100nF
Css=220nF
Css=470nF
Css=680nF
Css=820nF
Css=1
µF
fsw = 100KHz



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