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L4949 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. L4949
Description  100 mA, 5.0 V, Low Dropout Voltage Regulator with Power−On Reset
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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L4949 Datasheet(HTML) 6 Page - ON Semiconductor

 
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L4949, NCV4949
http://onsemi.com
6
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/
ms. For supply voltages
less than 8.0 V supply transients of more than 0.4 V/
ms 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 mF) reduces
also the output noise.
So
VZ
(optional)
Vout
Vout
Vbat
Cs
CO
C3
RSO 10 kW
Regulator
1.23 Vref
2.0 V
2.0
mA
Reset
1.23 V
Sense
GND
Reset
Si
VCC
CT
38
4
6
7
5
2
1
VCC
+
+
Preregulator
6.0 V
10 k
W
Figure 12. Application Schematic
NOTE:
1.
For stability: Cs ≥ 1.0 mF, CO ≥ 4.7 mF, ESR < 10 W at 10 kHz
2.
Recommended for application: Cs = CO = 10 mF


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