L4957 Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
L4957 Datasheet PDF : 7 Pages
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L4957
Figure 3: Maximum Output Current vs. Junction
Temperature
O utput Current [A]
10
9
8
7
6
5
4
(Vin-Vout) > 2V
3
pin 2 = GND
2
1
0
-40 -20 0 20 40 60 80 100 120 140 160
Tj [°C]
*Pulsed tecnique has been used
Figure 4: DC Operating Area
O utput Current [A]
8
V in > 2 .8V
7
T j= 1 2 5C
C u rre nt L im ita tio n
Tc =2 5 °C
P dmax = 40 W
6
R ds on
lim it
5
P ow er D is s ip ation Lim it
4
Tc= 70 °C
P dmax=22 W
3
D C Operating A rea
2
1
0
0
1
2
3
4
5
6
7
8
( Vin - Vo u t) [V]
Figure 5: Ripple Rejection vs. Frequency
R ip p le R e je c tio n [d B ]
100
90
V ripp le=3 Vp -p V r ipp le= 0 .5V p- p
80
70
60
50
40
C in =2 2u F
30
C o ut= 22 uF
Vo u t=1 .5V
20
V inm in= 3V
Io ut= 5 A
10
010
100
1k
10k
F requ en cy [H z]
100k
Figure 7: Maximum Output Current vs. Drop-Out
Voltage
Io [A ]
5
4 .5
T j = 25°C
4
Tj = 125°C
3 .5
Tj = 100°C
3
2 .5
2
1.5
1
m axim u m R on lim its
0.5
0
0 0.2 0.4 0 .6 0.8 1 1.2 1.4 1.6 1 .8 2
∆V = V in - Vo
4/7
Figure 6: Output Voltage vs. Output Current.
(VOUT = 1.5V)
VOUT
(V)
D98IN846A
80% VOUT
1.8
6.3 IOUT(A)
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