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L4978 Datasheet(PDF) 7 Page - STMicroelectronics

Part # L4978
Description  2A STEP DOWN SWITCHING REGULATOR
PDF  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4978 Datasheet(HTML) 7 Page - STMicroelectronics

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0
5 10 15 20 25 30 35 40 45 50 VCC(V)
90.0
92.5
95.0
97.5
100.0
102.5
105.0
107.5
fsw
(KHz)
D97IN735
Tj=25
°C
Figure 9. Switching Frequency vs. input
voltage.
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2
60
65
70
75
80
85
90
95
Io [A]
η [%]
Vcc=8V
Vcc=12V
Vcc=24V
Vcc=48V
Vo=3.36V
fsw=100kHz
Figure 14. Efficiency vs. output current.
0
5
10
15
20
25
30
80
82
84
86
88
90
92
94
96
98
Vo [V]
η [%]
fsw=100kHz
fsw=200kHz
Vcc=35V
Io=2A
Figure 12. Efficiency vs output voltage.
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
IO(A)
1.6 1.8
0.0
0.1
0.2
0.3
0.4
0.5
∆V
(V)
0.6
0.7
Tj=25
°C
Tj=125
°C
D98IN836
Tj=-25
°C
Figure 11. Dropout voltage between pin 5
and 4.
Vcc=12V
Vcc=8V
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2
60
65
70
75
80
85
90
95
Io [A]
η [%]
Vcc=8V
Vcc=12V
Vcc=24V
Vcc=48V
fsw=100kHz
Vo=5.1V
Figure 13. Efficiencyvs. output current.
-50
0
50
100
Tj(
°C)
90
95
100
105
fsw
(KHz)
D97IN785
Figure 10. Switching frequency vs. junction
temperature.
L4978
7/12



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