E-L4978D STMicroelectronics, E-L4978D Datasheet - Page 6
E-L4978D
Manufacturer Part Number
E-L4978D
Description
IC REG SW 2A STEP DOWN 16-SOIC
Manufacturer
STMicroelectronics
Type
Step-Down (Buck)r
Datasheet
1.L4978.pdf
(13 pages)
Specifications of E-L4978D
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3.3 ~ 50 V
Current - Output
2A
Frequency - Switching
100kHz ~ 300kHz
Voltage - Input
8 ~ 55 V
Operating Temperature
-40°C ~ 150°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.300", 7.5mm Width)
Power - Output
800mW
Output Voltage
3.5 V
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
L4978
Figure 6. Quiescent drain current vs. input
voltage.
Figure 7. Quiescent current vs. junction
temperature
Figure 8. Stand by drain current vs. input
voltage.
6/13
(mA)
Ibias
(mA)
(µA)
150
140
130
120
110
100
Iq
5
4
3
2
1
90
80
70
60
Iq
5
4
3
2
1
-50 -30 -10 10 30 50 70 90 110 Tj(˚C)
0 5 10 15 20 25 30 35 40 45 50
0 5 10 15 20 25 30 35 40 45 50 V
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)
CC
(V)
Figure 9. Line Regulation
.
Figure 10. Load 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
3.377
3.376
3.375
3.374
3.373
3.372
3.371
3.370
500
200
100
fsw
50
20
10
V
(V)
V
(V)
5
O
O
0
0 0.2 0.4 0.6
0 5 10 15 20 25 30 35 40 45 50 V
20
Tj=125˚C
0.8
40
1.0 1.2 1.4 1.6
Tj=25˚C
Tj=125˚C
60
V
Tj=25˚C
CC
Tamb=25˚C
=35V
80
D98IN835
D97IN784
D97IN733
1.8
R1(KΩ)
CC
I
O
(V)
(A)