E-L4978D STMicroelectronics, E-L4978D Datasheet - Page 7

• Manufacturer Part Number: E-L4978D
• Description: IC REG SW 2A STEP DOWN 16-SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

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

Figure 12. Switching Frequency vs. input
voltage..
Figure 13. Switching frequency vs. junction
temperature.
Figure 14. Dropout voltage between pin 5 and
4.
(KHz)
107.5
105.0
102.5
100.0
(KHz)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
(V)
97.5
95.0
92.5
90.0
∆
fsw
fsw
105
100
V
95
90
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
-50
0 5 10 15 20 25 30 35 40 45 50 V
0
50
Tj=125˚C
Tj=25˚C
100
Tj=-25˚C
1.6 1.8
D98IN836
D97IN785
D97IN735
Tj(˚C)
CC
I
O
(A)
(V)
Figure 15. Efficiency vs output voltage.
.
Figure 16. Efficiency vs. output current.
.
Figure 17. Efficiency vs. output current.
.
95
90
85
80
75
70
65
60
95
90
85
80
75
70
65
60
98
96
94
92
90
88
86
84
82
80
[%]
[%]
[%]
0
0
0
Vcc=24V
Vcc=24V
Vcc=12V
Vcc=8V
0.2 0.4 0.6 0.8
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2
Vcc=48V
Vcc=48V
5
Vcc=12V
Vcc=12V
10
Vo [V]
1
Io [A]
Io [A]
15
Vcc=8V
Vcc=8V
1.2 1.4 1.6 1.8
fsw=200kHz
fsw=100kHz
20
Vo=5.1V
Vo=3.36V
fsw=100kHz
fsw=100kHz
Vcc=35V
Io=2A
25
2
2.2
30
L4978
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