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PDF L4946B Data sheet ( Hoja de datos )
| Número de pieza | L4946B | |
| Descripción | QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET | |
| Fabricantes | STMicroelectronics | |
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Hay una vista previa y un enlace de descarga de L4946B (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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® L4946B
QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET
4 OUTPUTS: 10V (125mA); 8.5V (250mA); 5V
(200mA); 5V (100mA)
10V AND 5V (100mA) OUTPUT 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 L4946B is a quad output low drop voltage
regulator. The four outputs are a low drop 10V at
125mA (VO1), a 8.5V at 250mA (VO2), a 5V at
200mA (VO3) and a low drop 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.
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
Multiwatt 11
ORDERING NUMBER: L4946B
The STCAP pin allows the battery voltage to de-
cay slowly giving the µP time to store data. This
IC is designed for supplying microcomputer con-
trolled systems specially in automotive applica-
tions.
L4946B
125mA
8.5V 250mA
200mA
June 2000
1/9
1 page  
L4946
ELECTRICAL CHARACTERISTICS (continued)
Symbol
VO4
VO4
VO4
ON/OFF
VI ON/OFF
VR
Iq
Parameter
Max Bat.Trans.
Rev. Voltage Trans.
Rev. Voltage .
Ripple rejection
Output Noise (design only)
Input Current
Input Threshold
Reset Output Voltage Set
Reset and LVW Output Rise
Time
LVW Output Threshold
LVW and LVW Output Fall Time
LVW Output Voltage
Reset Output Stability
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 = 90mA; IO2 = 125mA;
IO3 = 75mA; IO4 = 50mA;
fO = 10KHz; 1VppAC ; VS =14V
IO1 = 90mA; IO2 = 125mA;
IO3 = 75mA; IO4 = 50mA;
Check output for AC noise
using A weighted filter (20-
20KHz)
Check output for AC noise
using 100kHz LP (20-100KHz)
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”
Ramp VS down until LVW
switches from”1” to a ”0”
STCAP <7V;RO = 200KΩ to VO4;
VIL = ”0”
STCAP >8V;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 = 175mA;
IO2 = 275mA; IO3 = 200mA;
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.
5
5
5
5
Max.
6
6
5.15
5.25
5.15
5.25
1
200
400
1
0.8
5
0.4
5
100
8.2
150
0.4
5
50
20
500
100
17
18
Unit
V
V
V
V
V
V
V
dB
dB
µV
µV
µA
µA
V
V
V
V
µs
V
µs
V
V
mV
mA
µA
mA
V
V
Note 1:
The L4946 has ”Foldback” on its outputs during current limiting. As the output loading is increasing the current supplied by the L4946 increases
until a threshold is reached. When the current limiting threshold is reached, the L4946 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 L4946B.PDF ] | |
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