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PDF TC4949 Data sheet ( Hoja de datos )
| Número de pieza | TC4949 | |
| Descripción | Multifunction Very Low Dropout Voltage Regulator | |
| Fabricantes | Telcom Semiconductor | |
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Multifunction Very Low Dropout Voltage Regulator
Multifunction Very Low Dropout Voltage Regulator
TTCC4499449
FEATURES
s Operating DC Supply Voltage Range 5.0V to 28V
s Transient Supply Voltage up to 40V
s Extremely Low Quiescent Current in
Standby Mode
s High Precision Standby Output Voltage 5.0V ±1%
s Output Current Capability up to 100mA
s Very Low Dropout Voltage less than 0.4V
s Reset Circuit Sensing the Output Voltage
s Programmable Reset Pulse Delay with
External Capacitor
s Voltage Sense Comparator
s Thermal Shutdown and Short Circuit Protections
GENERAL DESCRIPTION
The TC4949 is a monolithic integrated 5.0V voltage
regulator with a very low dropout and additional functions
such as power–on reset and input voltage sense. It is
designed for supplying the micro–computer controlled sys-
tems especially in automotive applications.
ORDERING INFORMATION
Part
Number
Package
TC4949VPA
TC4949VOA
8-Pin PDIP (Narrow)
8-Pin SOIC (Narrow)
Temperature
Range
–40 to +125°C
–40 to +125°C
REPRESENTATIVE BLOCK DIAGRAM
PIN CONFIGURATIONS
Supply
Voltage (VCC)
1
Output
Voltage (VOUT)
VZ 3
8 CT 4
Preregulator
6.0V
2.0µA
Sense
Input
(SIN)
2
Regulator
VS
1.23VREF
+
–
Reset
+
–
+
- 2.0V
+
–
+
- 1.23V
Sense
Reset
6
Sense
Output
(SOUT)
7
8-Pin PDIP
VCC 1
SIN 2
VZ 3
CT 4
TC4949
8-Pin SOIC
VCC 1
5 Gnd
SIN 2
VZ 3
TC4949
CT 4
www.datasheet4u.comTC4949-1 1/6/00
TelCom Semiconductor reserves the right to make ch1anges in the circuitry and specifications of its devices.
8 VOUT
7 SOUT
6 RESET
5 GND
8 VOUT
7 SOUT
6 RESET
5 GND
1 page  
Multifunction Very Low Dropout Voltage Regulator
TC4949
TYPICAL CHARACTERISTICS
Figure 9. Sense Output versus
Sense Input Voltage
6.0
5.0 TJ = 25˚C
4.0 Resistor 10k
from Sense Output
3.0 to 5.0V
2.0
1.0
0
1.0 1.05 1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5
VSI, SENSE INPUT VOLTAGE (V)
Figure 10. Sense Thresholds versus
Junction Temperature
1.4
1.38
1.36
Upper Threshold
1.34
1.32
1.3
1.28
1.26
Lower Threshold
1.24
1.22
1.2
-40 -20 0 20 40 60 80 100
TJ, JUNCTION TEMPERATURE (˚C)
120
APPLICATION INFORMATION
Supply Voltage Transient
High supply voltage transients can cause a reset output
signal perturbation. For supply voltages greater than 8.0V
the circuit shows a high immunity of the reset output against
supply transients of more than 100V/µsec. For supply volt-
ages less than 8.0V supply transients of more than
0.4V/µsec can cause a reset signal perturbation.To improve
the transient behavior for supply voltages less than 8.0V a
capacitor at Pin 3 can be used. A capacitor at Pin 3 (C3 ≤
1.0µF) reduces also the output noise.
VBAT
VCC
1
CS
VZ
(optional)
C3 VOUT CO
38
CT 4
Preregulator
6.0V
Regulator
VCC
SIN
2
1.23VREF
2.0mA
+
–
Reset
+
–
+
- 2.0V
Sense
+
–
+
- 1.23V
Reset
6
10kΩ
VOUT
RSO 10kΩ
SOUT
7
NOTES: 1. For stability: CS ≥ 1.0µF,CO ≥ 4.7µF, ESR < 10W at 10kHz
2. Recommended for application: CS= CO=10µF
5 Gnd
Figure 11. Application Schematic
TC4949-1 1/6/00
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet TC4949.PDF ] | |
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