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PDF L4948 Data sheet ( Hoja de datos )
| Número de pieza | L4948 | |
| Descripción | QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L4948 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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® L4948
QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET
4 OUTPUTS: 10V (300mA); 8V (400mA); 5V
(600mA); 5V (100mA)
ALL FOUR OUTPUTS ARE LOW DROP
5V (100mA) ST-BY OUTPUT VOLTAGE
EARLY WARNING OUTPUT FOR SUPPLY
UNDERVOLTAGE (LVW)
THERMAL SHUTDOWN AND CURRENT
LIMITATION (FOLDBACK)
REVERSE BATTERY AND LOAD DUMP
PROTECTION
INHIBIT (ON/OFF) AND RESET FUNCTIONS
DESCRIPTION
The L4948 is a quad output low drop voltage
regulator. All four outputs are low drop: 10V at
300mA (VO1), 8V at 400mA (VO2), 5V at 600mA
(VO3) and a 5V st-by line at 100mA (VO4).
The IC includes a monitoring circuit to warn if a
low voltage or no voltage condition is occurring.
VO1,2,3 are off during st-by mode.
The STCAP pin allows the battery voltage to de-
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
Multiwatt 11
ORDERING NUMBER: L4948
cay slowly giving the µP time to store data. This
IC is designed for supplying microcomputer con-
trolled systems specially in automotive applica-
tions.
June 2000
1/9
1 page  
L4948
ELECTRICAL CHARACTERISTICS (continued)
Symbol
VO4
Parameter
Max Bat.Trans.
VO4 Rev. Voltage Trans.
VO4 Rev. Voltage .
Ripple rejection
Output Noise
ON/OFF Input Current
VI ON/OFF Input Threshold
VR Reset Output Voltage Set
LVW and Reset fall Time Set
LVW and Reset Rise Time
LVW Output Threshold
LVW Output Voltage
Reset Output Stability
Iq St-By Quiescent Current (∆IS)
Maximum Quiescent Current
(∆IS)
STCAP Output Voltage
Test Condition
RO = 1000Ω
Ramp VS from 14 to 60V in 3-5ms
Hold VS at 60V for 10ms
Ramp VS from60 to 14V in 3-5ms;
Tamb = 25°C;
all temps
VS = -35V; t < 1ms; RO = 1000Ω
Check VO4, standard Tamb = 25°C;
all temps
VS = -15V; RO = 1000Ω
fO = 1KHz; 1VppAC ; VS =14V
IO1 = 180mA; IO2 = 200mA;
IO3 = 400mA; IO4 = 40mA;
fO = 10KHz; 1VppAC ; VS =14V
IO1 = 180mA; IO2 = 200mA;
IO3 = 400mA; IO4 = 40mA;
Check Output for AC noise
using a 100KHz LP filter
Check Output for AC noise
using an A weighted filter (20-
20KHz)
VS = 14V; VIH = >2V;
VS = 14V; VIL = <0.8V;
VS = 14V VIL
VS = 14V VIH
VS so that VO4 < 4.5V;
RO = 200KΩ to V04; VIL = ”0”
VS so that VO4 -0.15V;
RO = 200KΩ to V04; VIH = ”1”
Measured from 90% to 10%
Measured from 90% to 100%
Ramp VS down until LVW
switches from”1” to a ”0”
STCAP <6.5V;RO = 200KΩ to
VO4; VIL = ”0”
STCAP >7.5V;RO = 200KΩ to
VO4; VIH = ”1”
VS is set such that 1 < V04 <
4V; IOUT4 = 2mA; VON/OFF = 0
meas reset variation
VON/OFF = 0V; IO 4 = 100mA;
VS = 14V; IO 1,2,3 = 0mA
VON/OFF = 0V; IO 4 = 2mA;
Vbat = 14V; IO1,2,3 = 0mA
VS = 14V; IO1 = 300mA;
IO2 = 400mA; IO3 = 600mA;
IO4 = 100mA; VO = 5V
VS = 24V;
VS = 60V. 1ms
Min.
4.85
4.75
4.85
4.75
-0.4
50
50
-10
0
2
0
2.75
7.0
0
2.75
15
Typ. Max. Unit
6V
6V
5 5.15 V
5 5.25 V
5 5.15 V
5 5.25 V
1V
dB
dB
400 µV
200 µV
1
0.8
12
0.75
µA
µA
V
V
V
5V
150 µs
300 µs
8.2 V
0.75 V
50 V
50 mV
20 mA
500 µA
110 mA
17 V
18 V
Note 1:
The L4948 has ”Foldback” on its outputs during current limiting. As the output loading is increasing the current supplied by the L4948 increases
until a threshold is reached. When the current limiting threshold is reached, the L4948 output current will start to accrease as the loading is
continuoing to increase. The point where the output current stort to decrease is the maximum output current.
5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet L4948.PDF ] | |
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