l4957 STMicroelectronics, l4957 Datasheet - Page 3

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

PIN FUNCTIONS
THERMAL DATA
L4957 - ELECTRICAL CHARACTERISTICS (T
(1) GND connected to ground.
Figure 1: Line Regulation vs. Junction
Pin N
= Specifications referred to T
Symbol
4.5
3.5
2.5
1.5
0.5
1
2
3
R
Symbol
R
R
5
4
3
2
1
0
V
V
DSON
-40
I
I
th j-case
th j-amb
V
O
Q
IN
O
O
Name
GND
OUT
-20
IN
Temperature
Operating Supply Voltage
(1)
Output Voltage (1)
Load regulation (1)
Drain-Source ON
Resistance
Current Limiting
Short Circuit Current
Quiescent Current
Ripple Rejection
0
Unregulated input voltage; this pin must be bypassed with a capacitor larger than 10 F.
To connect to Ground to get 1.5V or 2.5V output.
Regulated output voltage. A minimum bypass capacitor of 22 F is required to insure stability.
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
Thermal Shutdown
Thermal Hysteresis
20
Parameter
40
Tj [ C]
3V < Vin < 6.5V
Iout = 10mA
60
80
J
from 0 C to +125 C.
100 120 140 160
For L4957V1.5/D1.5
0.1A < I
3V < V
For L4957V2.5/D2.5
0.1A < I
3V < V
0.1A < IO < 4A
90% V
V
0.1A < I
f = 120Hz, I
V
Parameter
O
IN
= 0V
= 5V
O
IN
IN
O
O
O
Test Condition
< 6.5V; 0.1A < I
< 6.5V; 0.1A < I
< 4A; 3V < V
< 4A; 3V < V
< 4A 3V < V
V
j
O
= 25 C, V
IN
= 4A
= 2V
PP
Figure 2: Load Regulation
Function
IN
IN
IN
-1
-2
-3
-4
-5
IN
5
4
3
2
1
0
< 6.5V
O
< 6.5V
O
< 6.5V
0
= 5V, unless otherwise specified).
< 4A
< 4A
Typ.
Typ.
Max.
Max.
1
(Pulsed technique has been used)
1.455
2.425
Min.
1.47
2.45
5.1
0.5
60
TO220
3
2.5
50
2
Iout [A]
Vout = 1.5V
Vin = 5V
Tj = 25 C
Typ.
150
200
1.5
1.5
2.5
2.5
6.3
1.8
20
75
2
3
D2PAK
60
3
1.545
2.575
Max.
1.53
2.55
300
6.5
7.5
10
2
4
L4957
Unit
Unit
m
C/W
C/W
mV
mA
dB
V
V
V
V
V
A
A
C
C
3/7
5