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L4949, NCV4949
100 mA, 5.0 V, Low Dropout
Voltage Regulator with
Power-On Reset
The L4949 is a monolithic integrated 5.0 V voltage regulator with a
very low dropout and additional functions such as power–on reset and
input voltage sense.
It is designed for supplying the micro–computer controlled systems
especially in automotive applications.
• Operating DC Supply Voltage Range 5.0 V to 28 V
• Transient Supply Voltage Up to 40 V
• Extremely Low Quiescent Current in Standby Mode
• High Precision Standby Output Voltage 5.0 V ±1%
• Output Current Capability Up to 100 mA
• Very Low Dropout Voltage Less Than 0.4 V
• Reset Circuit Sensing The Output Voltage
• Programmable Reset Pulse Delay With External Capacitor
• Voltage Sense Comparator
• Thermal Shutdown and Short Circuit Protections
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MARKING
DIAGRAMS
PDIP–8
8
1
8
1
N SUFFIX
CASE 626
SO–8
D SUFFIX
CASE 751
8
L4949N
AWL
YYWW
1
8
L4949
ALYWD
1
Supply
Voltage (V
Sense
CC
Input
(S
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN CONNECTIONS
Representative Block Diagram
Output
2.0 µA
Reset
)
out
C
T
Reset
6
+
2.0 V
Sense
-
+
1.23 V
-
Sense
Output
)
(S
o
7
Voltage (V
V
38 4
Z
)
1
)
i
2
V
s
Preregulator
6.0 V
Regulator
1.23 V
ref
V
1
CC
S
2
i
V
3
Z
C
4
T
(Top View)
V
8
out
S
7
o
Reset
6
Gnd
5
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
Semiconductor Components Industries, LLC, 2002
April, 2002 – Rev. 4
5
Gnd
1 Publication Order Number:
L4949/D

L4949, NCV4949
ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.)
Rating Symbol Value Unit
DC Operating Supply Voltage
Transient Supply Voltage (t < 1.0 s)
Output Current
ББББББББББББББББББББББ
Output Voltage
Sense Input Current
Sense Input Voltage
Output Voltages
Reset Output
Sense Output
Output Currents
Reset Output
Sense Output
Preregulator Output Voltage
Preregulator Output Current
ESD Protection at any pin
Human Body Model
Machine Model
Thermal Resistance, Junction–to–Air
P Suffix, DIP–8 Plastic Package, Case 626
D Suffix, SO–8 Plastic Package, Case 751
Maximum Junction Temperature
Storage Temperature Range
NOTE: ESD data available upon request.
V
CC
V
CC TR
I
out
ÁÁÁ
V
out
I
SI
V
SI
V
Reset
V
SO
I
Reset
I
SO
V
Z
I
Z
–
–
R
θ
JA
T
J
T
stg
28
40
Internally
Limited
ÁÁ
20
±1.0
V
CC
20
20
5.0
5.0
7.0
5.0
2000
400
100
200
150
–65 to +150
V
V
–
Á
V
mA
–
V
mA
V
mA
V
°C/W
°C
°C
ELECTRICAL CHARACTERISTICS (V
= 14 V, –40°C < TJ < 125°C, unless otherwise specified.)
CC
Characteristic
Output Voltage (TJ = 25°C, I
Output Voltage (6.0 V < VCC < 28 V, 1.0 mA < I
Output Voltage (VCC = 35 V, t < 1.0 s, 1.0 mA < I
= 1.0 mA)
out
< 50 mA)
out
out
< 50 mA)
Dropout Voltage
I
= 10 mA
out
I
= 50 mA
out
I
= 100 mA
out
Input to Output Voltage Difference in Undervoltage Condition
(VCC = 4.0 V, I
Line Regulation (6.0 V < VCC < 28 V, I
Load Regulation (1.0 mA < I
= 35 mA)
out
< 100 mA)
out
= 1.0 mA)
out
Current Limit
V
= 4.5 V
out
V
= 0 V
out
Quiescent Current (I
Quiescent Current (I
= 0.3 mA, TJ < 100°C)
out
= 100 mA)
out
Symbol Min Typ Max Unit
V
V
V
V
Reg
Reg
I
out
out
out
drop
V
IO
I
Lim
QSE
I
Q
line
load
4.95
4.9
4.9
–
–
–
–
–
–
105
–
–
–
5.0
5.0
5.0
0.1
0.2
0.3
0.2
1.0
8.0
200
100
150
–
5.05
5.1
5.1
0.25
0.40
0.50
0.4
20
30
400
–
260
5.0
V
V
V
V
V
mV
mV
mA
µA
mA
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L4949, NCV4949
ELECTRICAL CHARACTERISTICS (continued) (V
= 14 V, –40°C < TJ < 125°C, unless otherwise specified.)
CC
Characteristic UnitMaxTypMinSymbol
RESET
Reset Threshold Voltage
Reset Threshold Hysteresis
@ TJ = 25°C
@ TJ = –40 to +125°C
Reset Pulse Delay (CT = 100 nF, tR ≥ 100 µs)
Reset Reaction Time (CT = 100 nF)
Reset Output Low Voltage (R
Reset Output High Leakage Current (V
= 10 kΩ to V
Reset
Reset
, VCC ≥ 3.0 V)
out
= 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 kΩ to V
Sense Output Leakage (VSO = 5.0 V, VSI ≥ 1.5 V)
Sense Input Current
PREREGULATOR
Preregulator Output Voltage (IZ = 10 µA)
out
V
Resth
V
Resth,hys
t
ResD
t
ResR
V
ResL
I
ResH
V
CTth
V
CTth, hys
V
SOth
V
SOth,hys
)
V
I
SOL
SOH
I
SI
V
Z
–
50
50
55
–
–
–
–
–
1.16
20
–
–
–1.0
–
V
out
– 0.5
–
V
mV
100
–
100
5.0
–
–
2.0
100
1.23
100
–
–
0.1
6.3
200
300
180
30
0.4
1.0
–
–
1.35
200
0.4
1.0
1.0
–
ms
µs
V
µA
V
mV
V
mV
V
µA
µA
V
Pin
1
2
3
4
5
6
7
8
5.04
5.02
5.0
, OUTPUT VOLTAGE (V)
4.98
out
V
Symbol
V
CC
S
i
V
Z
C
T
Gnd
Reset
S
O
V
out
VCC = 14 V
I
= 1.0 mA
out
PIN FUNCTION DESCRIPTION
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
TYPICAL CHARACTERIZATION CURVES
6.0
5.0
4.0
3.0
2.0
, OUTPUT VOLTAGE (V)
out
V
1.0
T
J
= 25°C
RL = 5.0 k
R
L
= 100 Ω
4.96
-40 -20 0 40 6020 100 120
T
, JUNCTION TEMPERATURE (°C)
J
80
Figure 1. Output Voltage versus
Junction Temperature
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0
010
2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
1.0
V
, SUPPLY VOLTAGE (V)
CC
Figure 2. Output Voltage versus
Supply Voltage
3

L4949, NCV4949
TYPICAL CHARACTERIZATION CURVES (continued)
250
T
= 25°C
J
200
150
100
, DROPOUT VOLTAGE (mV)
50
drop
V
0
0.1 100
I
, OUTPUT CURRENT (mA)
out
101.0
Figure 3. Dropout Voltage versus
Output Current
3.0
VCC = 14 V
2.5
T
= 25°C
J
2.0
0.40
I
= 100 mA
0.30
0.20
, DROPOUT VOLTAGE (mV)
0.10
drop
V
0
-40 -20 0 40 6020 100 120
T
, JUNCTION TEMPERATURE (°C)
J
out
I
out
I
out
= 50 mA
= 10 mA
80
Figure 4. Dropout Voltage versus
Junction Temperature
3.0
T
2.5
2.0
= 25°C
J
1.5
1.0
, QUIESCENT CURRENT (mA)
Q
0.5
I
0
0.1 1.0 10 100
, OUTPUT CURRENT (mA)
I
out
Figure 5. Quiescent Current versus
Output Current
6.0
T
= 25°C
J
5.0
Resistor 10 k
from Reset Output
4.0
to 5.0 V
3.0
, RESET OUTPUT (V)
2.0
Reset
V
1.0
0
4.0 4.1
4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0
, OUTPUT VOLTAGE (V)
V
out
Figure 7. Reset Output versus
Regulator Output Voltage
R
1.5
= 100 Ω
L
1.0
, QUIESCENT CURRENT (mA)
Q
0.5
I
0
0 5.0 10 15 20 25 30
, SUPPLY VOLTAGE (V)
V
CC
RL = 5.0 k
Figure 6. Quiescent Current versus
Supply Voltage
4.7
4.66
Upper Threshold
4.62
4.58
4.54
4.5
, RESET THRESHOLD VOLTAGE (V)
Lower Threshold
4.46
Reset
V
4.42
-40 -20
0 20 40 60 80 100 120
T
, JUNCTION TEMPERATURE (°C)
J
Figure 8. Reset Thresholds versus
Junction Temperature
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