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Электронный компонент: L4949DR2

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L4949
background image
Semiconductor Components Industries, LLC, 2002
April, 2002 Rev. 4
1
Publication Order Number:
L4949/D
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 poweron reset and
input voltage sense.
It is designed for supplying the microcomputer 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
Regulator
1.23 V
ref
2.0 V
2.0
A
Reset
1.23 V
Sense
Gnd
Sense
Output
(S
o
)
Reset
Sense
Input
(S
i
)
Supply
Voltage (V
CC
)
V
Z
Output
Voltage (V
out
)
C
T
3
8
4
6
7
5
2
1
V
s
+
-
+
-
Preregulator
6.0 V
Representative Block Diagram
http://onsemi.com
(Top View)
PIN CONNECTIONS
1
2
3
4
8
7
6
5
V
Z
C
T
Gnd
S
i
V
CC
Reset
S
o
V
out
SO8
D SUFFIX
CASE 751
PDIP8
N SUFFIX
CASE 626
1
8
1
8
1
8
L4949N
AWL
YYWW
ALYWD
L4949
1
8
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
ORDERING INFORMATION
A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W
= Work Week
MARKING
DIAGRAMS
background image
L4949, NCV4949
http://onsemi.com
2
ABSOLUTE MAXIMUM RATINGS
(Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.)
Rating
Symbol
Value
Unit
DC Operating Supply Voltage
V
CC
28
V
Transient Supply Voltage (t < 1.0 s)
V
CC TR
40
V
Output Current
I
out
Internally
Limited
Output Voltage
V
out
20
V
Sense Input Current
I
SI
1.0
mA
Sense Input Voltage
V
SI
V
CC
Output Voltages
V
Reset Output
V
Reset
20
Sense Output
V
SO
20
Output Currents
mA
Reset Output
I
Reset
5.0
Sense Output
I
SO
5.0
Preregulator Output Voltage
V
Z
7.0
V
Preregulator Output Current
I
Z
5.0
mA
ESD Protection at any pin
V
Human Body Model
2000
Machine Model
400
Thermal Resistance, JunctiontoAir
R
JA
C/W
P Suffix, DIP8 Plastic Package, Case 626
100
D Suffix, SO8 Plastic Package, Case 751
200
Maximum Junction Temperature
T
J
150
C
Storage Temperature Range
T
stg
65 to +150
C
NOTE:
ESD data available upon request.
ELECTRICAL CHARACTERISTICS
(V
CC
= 14 V, 40
C < T
J
< 125
C, unless otherwise specified.)
Characteristic
Symbol
Min
Typ
Max
Unit
Output Voltage (T
J
= 25
C, I
out
= 1.0 mA)
V
out
4.95
5.0
5.05
V
Output Voltage (6.0 V < V
CC
< 28 V, 1.0 mA < I
out
< 50 mA)
V
out
4.9
5.0
5.1
V
Output Voltage (V
CC
= 35 V, t < 1.0 s, 1.0 mA < I
out
< 50 mA)
V
out
4.9
5.0
5.1
V
Dropout Voltage
V
drop
V
I
out
= 10 mA
0.1
0.25
I
out
= 50 mA
0.2
0.40
I
out
= 100 mA
0.3
0.50
Input to Output Voltage Difference in Undervoltage Condition
V
IO
0.2
0.4
V
(V
CC
= 4.0 V, I
out
= 35 mA)
Line Regulation (6.0 V < V
CC
< 28 V, I
out
= 1.0 mA)
Reg
line
1.0
20
mV
Load Regulation (1.0 mA < I
out
< 100 mA)
Reg
load
8.0
30
mV
Current Limit
I
Lim
mA
V
out
= 4.5 V
105
200
400
V
out
= 0 V
100
Quiescent Current (I
out
= 0.3 mA, T
J
< 100
C)
I
QSE
150
260
A
Quiescent Current (I
out
= 100 mA)
I
Q
5.0
mA
background image
L4949, NCV4949
http://onsemi.com
3
ELECTRICAL CHARACTERISTICS
(continued) (V
CC
= 14 V, 40
C < T
J
< 125
C, unless otherwise specified.)
Characteristic
Unit
Max
Typ
Min
Symbol
RESET
Reset Threshold Voltage
V
Resth
V
out
0.5
V
Reset Threshold Hysteresis
V
Resth,hys
mV
@ T
J
= 25
C
50
100
200
@ T
J
= 40 to +125
C
50
300
Reset Pulse Delay (C
T
= 100 nF, t
R
100
s)
t
ResD
55
100
180
ms
Reset Reaction Time (C
T
= 100 nF)
t
ResR
5.0
30
s
Reset Output Low Voltage (R
Reset
= 10 k
to V
out
, V
CC
3.0 V)
V
ResL
0.4
V
Reset Output High Leakage Current (V
Reset
= 5.0 V)
I
ResH
1.0
A
Delay Comparator Threshold
V
CTth
2.0
V
Delay Comparator Threshold Hysteresis
V
CTth, hys
100
mV
SENSE
Sense Low Threshold (V
SI
Decreasing = 1.5 V to 1.0 V)
V
SOth
1.16
1.23
1.35
V
Sense Threshold Hysteresis
V
SOth,hys
20
100
200
mV
Sense Output Low Voltage (V
SI
1.16 V, V
CC
3.0 V, R
SO
= 10 k
to V
out
)
V
SOL
0.4
V
Sense Output Leakage (V
SO
= 5.0 V, V
SI
1.5 V)
I
SOH
1.0
A
Sense Input Current
I
SI
1.0
0.1
1.0
A
PREREGULATOR
Preregulator Output Voltage (I
Z
= 10
A)
V
Z
6.3
V
PIN FUNCTION DESCRIPTION
Pin
Symbol
Description
1
V
CC
Supply Voltage
2
S
i
Input of Sense Comparator
3
V
Z
Output of Preregulator
4
C
T
Reset Delay Capacitor
5
Gnd
Ground
6
Reset
Output of Reset Comparator
7
S
O
Output of Sense Comparator
8
V
out
Main Regulator Output
4.96
4.98
5.0
5.02
5.04
-40
-20
0
40
60
20
100
120
T
J
, JUNCTION TEMPERATURE (
C)
80
V
CC
= 14 V
I
out
= 1.0 mA
V out
, OUTPUT
VOL
T
AGE (V)
0
2.0
3.0
4.0
6.0
0
10
V
CC
, SUPPLY VOLTAGE (V)
1.0
1.0
T
J
= 25
C
R
L
= 100
R
L
= 5.0 k
5.0
V out
, OUTPUT
VOL
T
AGE (V)
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
Figure 1. Output Voltage versus
Junction Temperature
Figure 2. Output Voltage versus
Supply Voltage
TYPICAL CHARACTERIZATION CURVES
background image
L4949, NCV4949
http://onsemi.com
4
0
100
150
200
250
0.1
100
I
out
, OUTPUT CURRENT (mA)
10
1.0
50
T
J
= 25
C
V drop
, DROPOUT
VOL
T
AGE (mV)
0
0.10
0.20
0.30
0.40
-40
-20
0
40
60
20
100
120
T
J
, JUNCTION TEMPERATURE (
C)
80
V drop
, DROPOUT
VOL
T
AGE (mV)
I
out
= 50 mA
I
out
= 10 mA
I
out
= 100 mA
3.0
2.5
2.0
1.5
1.0
0.1
1.0
10
100
0.5
0
V
CC
= 14 V
T
J
= 25
C
I
out
, OUTPUT CURRENT (mA)
I Q
, QUIESCENT
CURRENT
(mA)
3.0
2.5
2.0
1.5
1.0
0
5.0
10
15
20
25
30
V
CC
, SUPPLY VOLTAGE (V)
0.5
0
R
L
= 5.0 k
R
L
= 100
T
J
= 25
C
I Q
, QUIESCENT
CURRENT
(mA)
Figure 3. Dropout Voltage versus
Output Current
Figure 4. Dropout Voltage versus
Junction Temperature
Figure 5. Quiescent Current versus
Output Current
Figure 6. Quiescent Current versus
Supply Voltage
TYPICAL CHARACTERIZATION CURVES
(continued)
6.0
5.0
4.0
3.0
2.0
4.0
4.1
V
out
, OUTPUT VOLTAGE (V)
1.0
0
Resistor 10 k
from Reset Output
to 5.0 V
T
J
= 25
C
V Reset
, RESET
OUTPUT
(V)
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
4.7
4.66
4.62
4.58
4.5
-40
-20
T
J
, JUNCTION TEMPERATURE (
C)
4.46
4.42
Upper Threshold
V Reset
, RESET

THRESHOLD VOL
T
AGE (V)
0
20
40
60
80
100
120
4.54
Lower Threshold
Figure 7. Reset Output versus
Regulator Output Voltage
Figure 8. Reset Thresholds versus
Junction Temperature
background image
L4949, NCV4949
http://onsemi.com
5
6.0
5.0
4.0
2.0
1.0
1.15
V
SI
, SENSE INPUT VOLTAGE (V)
1.0
0
T
J
= 25
C
V SO
, SENSE OUTPUT
VOL
T
AGE (V)
1.2 1.25 1.3 1.35 1.4 1.45 1.5
3.0
Resistor 10 k
from Sense Output
to 5.0 V
1.1
1.05
1.4
1.38
1.36
1.34
1.3
-40
-20
T
J
, JUNCTION TEMPERATURE (
C)
1.28
1.2
Upper Threshold
V SI
, SENSE INPUT
VOL
T
AGE (V)
0
20
40
60
80
100
120
1.32
Lower Threshold
1.26
1.24
1.22
Figure 9. Sense Output versus
Sense Input Voltage
Figure 10. Sense Thresholds versus
Junction Temperature
TYPICAL CHARACTERIZATION CURVES
(continued)
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/
s. For supply voltages
less than 8.0 V supply transients of more than 0.4 V/
s 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
F) reduces
also the output noise.
S
o
V
Z
(optional)
V
out
V
out
V
bat
C
s
C
O
C3
R
SO
10 k
Regulator
1.23 V
ref
2.0 V
2.0
A
Reset
1.23 V
Sense
Gnd
Reset
S
i
V
CC
C
T
3
8
4
6
7
5
2
1
V
CC
+
-
+
-
Preregulator
6.0 V
10 k
Figure 11. Application Schematic
NOTES: 1. For stability: C
s
1.0
F, C
O
4.7
F, ESR < 10
at 10 kHz
2. Recommended for application: C
s
= C
O
= 10
F