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L4949 View Datasheet(PDF) - ON Semiconductor

Part Name
Description
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L4949 Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
L4949, NCV4949
ELECTRICAL CHARACTERISTICS (continued) (VCC = 14 V, −40°C < TA < 125°C, unless otherwise specified.)
Characteristic
Symbol
Min
Typ
RESET
Reset Threshold Voltage
Reset Threshold Hysteresis
@ TA = 25°C
@ TA = −40 to +125°C
Reset Pulse Delay (CT = 100 nF, tR 100 ms)
Reset Reaction Time (CT = 100 nF)
Reset Output Low Voltage (RReset = 10 kW to Vout, VCC 3.0 V)
Reset Output High Leakage Current (VReset = 5.0 V)
Delay Comparator Threshold
Delay Comparator Threshold Hysteresis
SENSE
Sense Low Threshold (VSI Decreasing = 1.5 V to 1.0 V)
Sense Threshold Hysteresis
Sense Output Low Voltage (VSI 1.16 V, VCC 3.0 V, RSO = 10 kW to Vout)
Sense Output Leakage (VSO = 5.0 V, VSI 1.5 V)
Sense Input Current
VResth
VResth,hys
tResD
tResR
VResL
IResH
VCTth
VCTth, hys
Vout − 0.5
50
100
50
55
100
5.0
2.0
100
VSOth
VSOth,hys
VSOL
ISOH
ISI
1.16
20
−1.0
1.23
100
0.1
PREREGULATOR
Preregulator Output Voltage (IZ = 10 mA)
VZ
6.3
Max
200
300
180
30
0.4
1.0
1.35
200
0.4
1.0
1.0
Unit
V
mV
ms
ms
V
mA
V
mV
V
mV
V
mA
mA
V
PIN FUNCTION DESCRIPTION
Pin
SOIC−8, PDIP−8
Pin
SOIC−20W
1
19
2
20
3
1
4
2
5
4 − 7, 14 − 17
6
10
7
11
8
12
3, 8, 9, 13, 18
Symbol
VCC
Si
VZ
CT
GND
Reset
SO
Vout
NC
Description
Supply Voltage
Input of Sense Comparator
Output of Preregulator
Reset Delay Capacitor
Ground
Output of Reset Comparator
Output of Sense Comparator
Main Regulator Output
No Connect
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