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L4949D View Datasheet(PDF) - ON Semiconductor

Part NameDescriptionManufacturer
L4949D 100 mA, 5.0 V, Low Dropout Voltage Regulator with Power−On Reset ON-Semiconductor
ON Semiconductor ON-Semiconductor
L4949D Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
L4949, NCV4949
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.
C3
Vout CO
VZ
(optional)
3
8
CT 4
Vbat
VCC
Preregulator
1
6.0 V
Cs
2.0 mA
Regulator
VCC
Si
2
1.23 Vref
Reset
+
2.0 V
Sense
+
1.23 V
5 GND
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
Figure 12. Application Schematic
Reset
6
10 kW
Vout
RSO 10 kW
So
7
http://onsemi.com
6
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