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L4971 Datasheet(PDF) 6 Page - STMicroelectronics

Part # L4971
Description  1.5A STEP DOWN SWITCHING REGULATOR
Download  13 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4971 Datasheet(HTML) 6 Page - STMicroelectronics

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Figure 6. Quiescent drain current vs. input
voltage.
Figure 7. Quiescent current vs. junction
temperature
Figure 8. Stand-by drain current vs. input
voltage
Figure 9. Line Regulation
Figure 10. Line Regulation
Figure 11. Switching frquency vs. R1 and C2
0
5 10 15 20 25 30 35 40 45 50
Vcc(V)
1
2
3
4
5
Iq
(mA)
200KHz
R1=22K
C2=1.2nF
0Hz
D97IN724
Tamb=25˚C
0% DC
100KHz
R1=20K
C2=2.7nF
-50 -30 -10 10 30 50 70 90 110
Tj(˚C)
1
2
3
4
5
Iq
(mA)
D97IN731
0Hz
200KHz
R1=22K
C2=1.2nF
VCC=35V
0% DC
100KHz
R1=20K
C2=2.7nF
0
5 10 15 20 25 30 35 40 45 50 VCC(V)
60
70
80
90
100
110
120
130
140
150
Ibias
(
µA)
D97IN732
Tj=25˚C
Tj=125˚C
Vss=GND
0
5 10 15 20 25 30 35 40 45 50 VCC(V)
3.370
3.371
3.372
3.373
3.374
3.375
3.376
3.377
VO
(V)
D97IN733
Tj=25˚C
Tj=125˚C
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4 IO(A)
3.360
3.362
3.364
3.366
3.368
3.370
3.372
3.374
3.376
3.378
VO
(V)
Tj=25˚C
Tj=125˚C
VCC=35V
D97IN734
0
20
40
60
80
R1(K
Ω)
5
10
20
50
100
200
500
fsw
(KHz)
D97IN784
0.82nF
1.2nF
2.2nF
3.3nF
4.7nF
5.6nF
Tamb=25˚C


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