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