L4957AD18 STMICROELECTRONICS [STMicroelectronics], L4957AD18 Datasheet - Page 4

• Manufacturer Part Number: L4957AD18
• Description: UP TO 5A ULDO LINEAR REGULATOR
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Figure 3: Maximum Output Current vs. Junction
O utput C urrent [A]
Figure 5: Ripple Rejection vs. Frequency
R ip p le R e j e c t i o n [ d B ]
1 0 0
L4957A
Figure 7: Maximum Output Current vs. Drop-Out
4/7
Io [A ]
1 .5
4 .5
3 .5
2 .5
0 .5
10
9 0
8 0
7 0
6 0
5 0
4 0
3 0
2 0
1 0
9
8
7
6
5
4
3
2
1
0
0
*P ulsed te cniq ue h as been used
4
2
1
0
5
-40 -20
3
1 0
0
C in = 2 2 u F
C o u t= 2 2 u F
V o u t= 1 .5 V
V in m in = 3 V
Io ut= 5 A
0 .2 0 .4 0 .6 0 .8
(Vin-Vout) > 2V
pin 2 = G ND
Temperature
Voltage
0
1 0 0
V r ip p l e = 3 V p -p V r ip p le = 0 .5 V p - p
20
F r e q u e n c y [ H z ]
40
Tj [ C]
1 k
60
m a x im u m R o n lim its
1
80 100 120 140 160
1 .2 1 .4 1 .6 1 .8
1 0 k
T j = 1 0 0 C
T j = 1 2 5 C
T j = 2 5 C
V = V in - Vo
1 0 0 k
2
Figure 4: DC Operating Area
Figure 6: Output Voltage vs. Output Current.
V
O u t p u t C ur r en t [ A ]
8
7
6
5
4
3
2
1
0
(V)
OUT
0
Vin >2.8 V
Tj=1 25 C
R d so n
lim it
1
(V
OUT
2
C ur re n t L im ita tio n
D C O p e rating A r ea
= 1.5V)
( V in - Vou t ) [ V ]
3
4
P o w e r D is s ip ation L im it
Tc = 7 0 C
P d m a x = 22 W
5
6.3
6
Tc =2 5 C
P d m a x = 40 W
D00IN1109
I OUT (A)
7
8