l4955 STMicroelectronics, l4955 Datasheet - Page 5

• Manufacturer Part Number: l4955
• Description: 5a Uldo Linear Regulators Family
• Manufacturer: STMicroelectronics

Figure 1: L4955 DC Operating Area
O u tput C ur rent [A ]
Figure 3: Line Regulation vs. Junction
Figure 5: Dropout Voltage
8
7
6
5
4
3
2
1
0
0
1 . 2 5
0 . 7 5
0 . 2 5
0 . 5
4 .5
3 .5
2 .5
1 .5
0 .5
1
0
R dson
0
5
4
3
2
1
2.5
lim it
C urr ent Lim itation
-4 0 -2 0
D C O perating A re a
0
Temperature
5
1
0
7.5
(V in - Vou t) [V ]
2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0
2
10
P u l s e d t e c h n iq u e h a s b e e n u s e d
Pow er D is sipation Lim it
T j [ C ]
I o u t [ A ]
12.5
4 .5V < V in< 2 2V
3
Iou t= 1 0 m A
T c = 70 C
P dm ax = 22W
15
T c = 25 C
P dm ax = 40W
4
17.5
V in > 4.5V
T j = 125 C
T j = 1 2 5
T j = 2 5
T j = - 4 0
20
5
22.5
C
C
C
6
L4955
Figure 2: Output Voltage Stability vs. Junction
1 . 2 7 5
1 . 2 6 5
1 . 2 5 5
1 . 2 4 5
Figure 4: Load Regulation
Figure 6: Maximum OutputCurrent vs. Junction
O utput C urrent [A]
Vo u t [V ]
10
1 . 2 8
1 . 2 7
1 . 2 6
1 . 2 5
1 . 2 4
9
8
7
6
5
4
3
2
1
0
*P ulsed tecnique ha s been used
-1
-2
-3
-4
-5
-40 -20
5
4
3
2
1
0
- 4 0
0
(Vin-Vout) > 2V
pin 2 = G ND
Temperature
Temperaturewith internalcurrent limiting
0
1
0
20
V in = 1 2 V
Io u t= 1 0 m A
( P u ls e d t e c h n iq u e h a s b e e n u s e d )
40
4 0
2
Tj [ C]
Vo u t = V
Io u t [A ]
T j [ C ]
60
V in = 1 2 V
T j = 2 5
80 100 120 140 160
8 0
A D J
3
C
1 2 0
4
L4955
5/14
1 6 0
5