l4957 STMicroelectronics, l4957 Datasheet - Page 4

• Manufacturer Part Number: l4957
• Description: Up To 4a Uldo Linear Regulator
• Manufacturer: STMicroelectronics

L4957
Figure 3: Maximum Output Current vs. Junction
O utput C urrent [A]
Figure 5: Ripple Rejection vs. Frequency
R ip p le R e je c t i o n [ d B ]
1 0 0
Figure 7: Maximum Output Current vs. Drop-Out
4/7
Io [A ]
1 .5
0 .5
4 .5
3 .5
2 .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 tecnique ha s been used
4
2
1
0
5
3
-40 -20
1 0
0
C i n = 2 2u F
C o u t= 2 2 u F
V o u t= 1 . 5 V
V i n m in = 3 V
Io u t= 5 A
0 .2 0 .4 0 .6 0 .8
(Vin-Vout) > 2V
pin 2 = G ND
Temperature
Voltage
0
1 0 0
V rip p l e = 3 V p -p V r ipp l e = 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.
O u t p u t C u r r en t [ A ]
8
7
6
5
4
3
2
1
0
0
V
(V)
OUT
V in > 2 .8V
T j= 1 2 5C
R d s on
lim it
1
(V
OUT
2
1.8
C u rre nt L im ita tio n
D C O p e ratin g A re a
= 1.5V)
( Vi n - Vo u t ) [ V ]
3
4
P ow er D is s ip ation Lim it
Tc = 70 C
P d m a x =2 2 W
5
6.3
6
D98IN846A
80% V
Tc =2 5 C
P dm a x = 40 W
I OUT (A)
OUT
7
8