L4971 STMicroelectronics, L4971 Datasheet - Page 6
L4971
Manufacturer Part Number
L4971
Description
IC REG SW 1.5A STEP DOWN 8-DIP
Manufacturer
STMicroelectronics
Type
Step-Down (Buck)r
Datasheet
1.L4971D013TR.pdf
(13 pages)
Specifications of L4971
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3.3 ~ 50 V
Current - Output
1.5A
Frequency - Switching
100kHz ~ 300kHz
Voltage - Input
8 ~ 55 V
Operating Temperature
0°C ~ 125°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Power - Output
1W
Output Voltage
50 V
Mounting Style
Through Hole
For Use With
497-4744 - BOARD EVAL FOR L4971/L4978 REG
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-6697-5
E-L4971
E-L4971
L4971
E-L4971
E-L4971
L4971
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
L4971
Manufacturer:
ST
Quantity:
20 000
Part Number:
L49710MA
Manufacturer:
NS/国半
Quantity:
20 000
Company:
Part Number:
L4971AD013TR
Manufacturer:
MIT
Quantity:
6 231
Part Number:
L4971D013TR
Manufacturer:
SOP16
Quantity:
20 000
L4971
Figure 6. Quiescent drain current vs. input
Figure 7. Quiescent current vs. junction
Figure 8. Stand-by drain current vs. input
6/13
(mA)
Ibias
(mA)
(µA)
150
140
130
120
110
100
90
80
70
60
Iq
5
4
3
2
1
Iq
5
4
3
2
1
-50 -30 -10 10 30 50 70 90 110
0 5 10 15 20 25 30 35 40 45 50 V
0 5 10 15 20 25 30 35 40 45 50
voltage.
temperature
voltage
Vss=GND
V
0% DC
CC
Tamb=25˚C
0% DC
=35V
200KHz
R
C
1
2
=22K
=1.2nF
Tj=25˚C
100KHz
R
C
1
2
Tj=125˚C
=20K
=2.7nF
200KHz
R
C
100KHz
R
C
0Hz
1
2
1
2
=22K
=1.2nF
=20K
=2.7nF
0Hz
D97IN724
D97IN732
D97IN731
Vcc(V)
Tj(˚C)
CC
(V)
Figure 9. Line Regulation
Figure 10. Line Regulation
Figure 11. Switching frquency vs. R1 and C2
(KHz)
3.378
3.376
3.374
3.372
3.370
3.368
3.366
3.364
3.362
3.360
500
200
100
3.377
3.376
3.375
3.374
3.373
3.372
3.371
3.370
fsw
50
20
10
(V)
V
5
V
(V)
O
O
0
0
0 5 10 15 20 25 30 35 40 45 50 V
0.2 0.4 0.6 0.8 1.0 1.2 1.4 I
20
Tj=125˚C
40
Tj=125˚C
60
Tj=25˚C
Tj=25˚C
V
CC
Tamb=25˚C
=35V
80
D97IN784
D97IN733
D97IN734
R1(KΩ)
CC
O
(V)
(A)