TC4949 查看數據表（PDF） - TelCom Semiconductor Inc => Microchip
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TC4949 Datasheet PDF : 9 Pages
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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 80 100 120
TJ, JUNCTION TEMPERATURE (˚C)
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
3
8
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
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