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L4957AD1.8 Datasheet(PDF) 4 Page - STMicroelectronics

Part No. L4957AD1.8
Description  UP TO 5A ULDO LINEAR REGULATOR
Download  7 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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L4957AD1.8 Datasheet(HTML) 4 Page - STMicroelectronics

   
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*P ulsed te cniq ue h as been used
-40
-2 0
0
204 06080
10 0 12 0 1 40 16 0
0
1
2
3
4
5
6
7
8
9
10
Tj [
°C]
O u tpu t C urre nt [A]
(Vin-Vou t) > 2V
pin 2 = G ND
Figure 3: Maximum Output Current vs. Junction
Temperature
Vin >2. 8 V
Tj=1 25 C
Tc =2 5
°C
Pd m a x = 40 W
Rd s o n
lim it
D C Operat ing A rea
P o w e r D is s ip at ion L im it
C urrent Lim it a t io n
Tc = 7 0
°C
Pd m a x = 22 W
0
12345
678
0
1
2
3
4
5
6
7
8
(V in - Vou t) [V ]
O u t put C ur r e n t [ A ]
Figure 4: DC Operating Area
0
10
20
30
40
50
60
70
80
90
10 0
F r eq u ency [ H z ]
Ripp le Re j e c t i o n [ d B ]
1k
1 0
10 0
1 0k
1 00k
V r ip pl e= 3V p- p V r ipple = 0.5 V p- p
C in = 22 uF
Co u t= 2 2 u F
Vo u t= 1 .5 V
Vin m in = 3 V
Io ut= 5 A
Figure 5: Ripple Rejection vs. Frequency
6.3
IOUT(A)
VOUT
(V)
D00IN1109
Figure 6: Output Voltage vs. Output Current.
(VOUT = 1.5V)
0
0 .2 0.4
0 .6 0.8
1
1.2 1 .4
1.6 1 .8
2
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
∆ V= V in - Vo
Io
[A ]
m a x i mu m R o n li mi ts
Tj = 1 0 0
°C
Tj = 1 2 5
°C
Tj = 2 5
°C
Figure 7: Maximum Output Current vs. Drop-Out
Voltage
L4957A
4/7


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