l4949dw ON Semiconductor, l4949dw Datasheet - Page 6

• Manufacturer Part Number: l4949dw
• Description: 5v / 100ma Ldo W/ Reset, Delay Reset And Early Warning
• Manufacturer: ON Semiconductor

Supply Voltage Transient
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
NOTE:
V
High supply voltage transients can cause a reset output
bat
1. For stability: C
2. Recommended for application: C
C
s
V
s
CC
S
1
2
≥ 1.0 mF, C
i
V
CC
O
Regulator
≥ 4.7 mF, ESR < 10 W at 10 kHz
Preregulator
s
1.23 V
= C
(optional)
6.0 V
APPLICATION INFORMATION
Figure 12. Application Schematic
V
O
Z
ref
= 10 mF
L4949, NCV4949
http://onsemi.com
C3
3
6
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) also
reduces the output noise.
V
5
out
Reset
GND
8
C
2.0 mA
O
Sense
C
T
4
+
-
+
-
2.0 V
1.23 V
6
7
R
SO
10 kW
10 kW
V
Reset
out
S
o