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L4949 Datasheet(PDF) 5 Page - Motorola, Inc

Part No. L4949
Description  MULTIFUNCTION VERY LOW DROPOUT VOLTAGE REGULATOR
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
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L4949 Datasheet(HTML) 5 Page - Motorola, Inc

   
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L4949
5
MOTOROLA ANALOG IC DEVICE DATA
6.0
5.0
4.0
2.0
1.0
1.15
VSI, SENSE INPUT VOLTAGE (V)
1.0
0
TJ = 25°C
1.2
1.25
1.3
1.35
1.4
1.45
1.5
3.0
Resistor 10 k
from Sense Output
to 5.0 V
1.1
1.05
1.4
1.38
1.36
1.34
1.3
–40
–20
TJ, JUNCTION TEMPERATURE (°C)
1.28
1.2
Upper Threshold
0
20
40
60
80
100
120
1.32
Lower Threshold
1.26
1.24
1.22
Figure 9. Sense Output versus
Sense Input Voltage
Figure 10. Sense Thresholds versus
Junction Temperature
TYPICAL CHARACTERIZATION CURVES (continued)
APPLICATION INFORMATION
Supply Voltage Transient
High supply voltage transients can cause a reset output
signal perturbation. For supply voltages greater than 8.0 V
the circuit shows a high immunity of the reset output against
supply transients of more than 100 V/
µs. For supply voltages
less than 8.0 V supply transients of more than 0.4 V/
µs can
cause a reset signal perturbation. To improve the transient
behavior for supply voltages less than 8.0 V a capacitor at Pin
3 can be used. A capacitor at Pin 3 (C3
≤ 1.0 µF) reduces
also the output noise.
So
VZ
(optional)
Vout
Vout
Vbat
Cs
CO
C3
RSO 10 kΩ
Regulator
1.23 Vref
2.0 V
2.0
µA
Reset
1.23 V
Sense
Gnd
Reset
Si
VCC
CT
38
4
6
7
5
2
1
VCC
+
+
Preregulator
6.0 V
10 k
Figure 11. Application Schematic
NOTES: 1. For stability: Cs ≥ 1.0 µF, CO ≥ 4.7 µF, ESR < 10 Ω at 10 kHz
2. Recommended for application: Cs = CO = 10 µF


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