L4949N [ONSEMI]
MULTIFUNCTION VERY LOW DROPOUT VOLTAGE REGULATOR; 多功能非常低压差稳压器
| 型号： | L4949N |
| 厂家： | 
ONSEMI |
| 描述： | MULTIFUNCTION VERY LOW DROPOUT VOLTAGE REGULATOR |
| 文件： | 总8页 (文件大小：195K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Order this document from L4949/D
MULTIFUNCTION
VERY LOW DROPOUT
VOLTAGE REGULATOR
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.
SILICON MONOLITHIC
INTEGRATED CIRCUIT
• 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
8
1
• Thermal Shutdown and Short Circuit Protections
N SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
Representative Block Diagram
Output
Voltage (V
8
)
out
V
3
C
4
Z
T
PIN CONNECTIONS
Supply
Voltage (V
)
CC
Preregulator
6.0 V
1
V
V
out
1
2
3
4
8
7
6
5
CC
2.0 µA
S
i
S
o
Reset
6
V
Reset
Gnd
Z
+
–
C
2.0 V
T
Regulator
Sense
Output
Reset
V
Sense
Input
s
(S )
o
(Top View)
(S )
i
7
2
+
–
1.23 V
ORDERING INFORMATION
Operating
1.23 V
ref
Sense
Temperature Range
Device
L4949N
L4949D
Package
5
Gnd
DIP–8
T = –40° to +125°C
J
SO–8
Motorola, Inc. 1998
Rev 1
L4949
ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond
which damage to the device may occur.)
Rating
DC Operating Supply Voltage
Transient Supply Voltage (t < 1.0 s)
Output Current
Symbol
Value
28
Unit
V
V
CC
V
CC TR
40
V
I
Internally
Limited
–
out
Output Voltage
V
20
V
mA
–
out
Sense Input Current
Sense Input Voltage
I
SI
±1.0
V
V
CC
SI
Output Voltages
Reset Output
Sense Output
V
V
V
20
20
Reset
SO
Output Currents
Reset Output
Sense Output
mA
I
Reset
5.0
5.0
I
SO
Preregulator Output Voltage
Preregulator Output Current
V
7.0
5.0
V
mA
V
Z
I
Z
ESD Protection at any pin
Human Body Model
Machine Model
–
–
2000
400
Thermal Resistance, Junction–to–Air
R
°C/W
θJA
P Suffix, DIP–8 Plastic Package, Case 626
D Suffix, SO–8 Plastic Package, Case 751
100
200
Maximim Junction Temperature
Storage Temperature Range
T
150
°C
°C
J
T
stg
–65 to +150
NOTE: ESD data available upon request.
ELECTRICAL CHARACTERISTICS (V
= 14 V, –40°C < T < 125°C, unless otherwise specified.)
J
CC
Characteristic
Symbol
Min
4.95
4.9
Typ
5.0
5.0
5.0
Max
5.05
5.1
Unit
V
Output Voltage (T = 25°C, I
= 1.0 mA)
V
out
J
out
Output Voltage (6.0 V < V
< 28 V, 1.0 mA < I
< 50 mA)
V
out
V
CC
out
Output Voltage (V
Dropout Voltage
= 35 V, t < 1.0 s, 1.0 mA < I
< 50 mA)
V
out
4.9
5.1
V
CC
out
V
drop
V
I
I
I
= 10 mA
= 50 mA
= 100 mA
–
–
–
0.1
0.2
0.3
0.25
0.40
0.50
out
out
out
Input to Output Voltage Difference in Undervoltage Condition
(V = 4.0 V, I = 35 mA)
V
IO
–
0.2
0.4
V
CC
out
Line Regulation (6.0 V < V
< 28 V, I
= 1.0 mA)
Reg
–
–
1.0
8.0
20
30
mV
mV
mA
CC
out
line
Load Regulation (1.0 mA < I
Current Limit
< 100 mA)
Reg
load
out
I
Lim
V
= 4.5 V
= 0 V
105
–
200
100
400
–
out
V
out
Quiescent Current (I
Quiescent Current (I
= 0.3 mA, T < 100°C)
I
QSE
–
–
150
–
260
5.0
µA
out
out
J
= 100 mA)
I
Q
mA
2
MOTOROLA ANALOG IC DEVICE DATA
L4949
ELECTRICAL CHARACTERISTICS (continued) (V
= 14 V, –40°C < T < 125°C, unless otherwise specified.)
J
CC
Characteristic
Symbol
Min
Typ
Max
Unit
RESET
Reset Threshold Voltage
V
Resth
–
V
out
– 0.5
–
V
Reset Threshold Hysteresis
V
mV
Resth,hys
@ T = 25°C
50
50
100
–
200
300
J
@ T = –40 to +125°C
J
Reset Pulse Delay (C = 100 nF, t ≥ 100 µs)
t
t
55
–
100
5.0
–
180
30
0.4
1.0
–
ms
µs
V
T
R
ResD
Reset Reaction Time (C = 100 nF)
T
ResR
Reset Output Low Voltage (R
= 10 kΩ to V , V
out CC
≥ 3.0 V)
V
–
Reset
ResL
Reset Output High Leakage Current (V
Delay Comparator Threshold
= 5.0 V)
I
–
–
µA
V
Reset
ResH
V
–
2.0
100
CTth
Delay Comparator Threshold Hysteresis
V
V
–
–
mV
CTth, hys
SENSE
Sense Low Threshold (V Decreasing = 1.5 V to 1.0 V)
SI
V
1.16
20
–
1.23
100
–
1.35
200
0.4
V
mV
V
SOth
Sense Threshold Hysteresis
SOth,hys
Sense Output Low Voltage
V
SOL
(V ≤ 1.16 V, V
SI
≥ 3.0 V, R
SO
= 10 kΩ to V )
out
CC
Sense Output Leakage (V
Sense Input Current
PREREGULATOR
= 5.0 V, V ≥ 1.5 V)
SI
I
–
–
1.0
1.0
µA
µA
SO
SOH
I
SI
–1.0
0.1
Preregulator Output Voltage (I = 10 µA)
V
Z
–
6.3
–
V
Z
PIN FUNCTION DESCRIPTION
Pin
1
Symbol
Description
V
S
V
Supply Voltage
CC
2
Input of Sense Comparator
Output of Preregulator
Reset Delay Capacitor
Ground
i
3
Z
4
C
T
5
Gnd
Reset
6
Output of Reset Comparator
Output of Sense Comparator
Main Regulator Output
7
S
O
8
V
out
TYPICAL CHARACTERIZATION CURVES
Figure 2. Output Voltage versus
Supply Voltage
Figure 1. Output Voltage versus
Junction Temperature
5.04
5.02
5.0
6.0
5.0
4.0
3.0
2.0
1.0
T
= 25°C
V
= 14 V
J
CC
= 1.0 mA
I
out
R
= 5.0 k
L
R
= 100 Ω
L
4.98
4.96
0
–40
–20
0
20
40
60
80
C)
100
120
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10
T , JUNCTION TEMPERATURE (
°
V
, SUPPLY VOLTAGE (V)
J
CC
3
MOTOROLA ANALOG IC DEVICE DATA
L4949
TYPICAL CHARACTERIZATION CURVES (continued)
Figure 3. Dropout Voltage versus
Figure 4. Dropout Voltage versus
Junction Temperature
Output Current
250
200
0.40
T
= 25°C
J
I
= 100 mA
out
0.30
0.20
0.10
0
150
100
I
I
= 50 mA
= 10 mA
out
out
50
0
0.1
1.0
10
100
–40
–20
0
20
40
60
80
100
120
I
, OUTPUT CURRENT (mA)
T , JUNCTION TEMPERATURE (°C)
J
out
Figure 5. Quiescent Current versus
Output Current
Figure 6. Quiescent Current versus
Supply Voltage
3.0
2.5
2.0
1.5
1.0
0.5
0
3.0
V
= 14 V
= 25°C
CC
T
= 25°C
2.5
2.0
1.5
1.0
0.5
J
T
J
R
= 100 Ω
L
R
= 5.0 k
20
L
0
0.1
1.0
10
100
0
5.0
10
15
25
30
I
, OUTPUT CURRENT (mA)
V
, SUPPLY VOLTAGE (V)
out
CC
Figure 8. Reset Thresholds versus
Junction Temperature
Figure 7. Reset Output versus
Regulator Output Voltage
6.0
4.7
4.66
4.62
4.58
4.54
4.5
T
= 25°C
J
5.0
4.0
3.0
2.0
1.0
Upper Threshold
Resistor 10 k
from Reset Output
to 5.0 V
Lower Threshold
4.46
4.42
0
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
–40
–20
0
20
40
60
80
C)
100
120
V
, OUTPUT VOLTAGE (V)
T , JUNCTION TEMPERATURE (
°
out
J
4
MOTOROLA ANALOG IC DEVICE DATA
L4949
TYPICAL CHARACTERIZATION CURVES (continued)
Figure 9. Sense Output versus
Sense Input Voltage
Figure 10. Sense Thresholds versus
Junction Temperature
6.0
5.0
4.0
3.0
2.0
1.0
0
1.4
1.38
1.36
1.34
1.32
1.3
T
= 25°C
J
Upper Threshold
Lower Threshold
Resistor 10 k
from Sense Output
to 5.0 V
1.28
1.26
1.24
1.22
1.2
1.0 1.05 1.1 1.15 1.2
1.25 1.3 1.35 1.4 1.45
1.5
–40
–20
0
20
40
60
80
C)
100
120
V
, SENSE INPUT VOLTAGE (V)
T , JUNCTION TEMPERATURE (°
SI
J
APPLICATION INFORMATION
Supply Voltage Transient
less than 8.0 V supply transients of more than 0.4 V/µs 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 µF) reduces
also the output noise.
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/µs. For supply voltages
Figure 11. Application Schematic
V
out
C
C3
O
V
Z
3
8
C
4
(optional)
T
V
V
bat
CC
Preregulator
6.0 V
1
C
s
2.0 µA
Reset
6
10 k
Ω
Ω
+
–
V
out
2.0 V
Regulator
Reset
R
10 k
V
SO
CC
S
o
S
i
7
2
+
–
1.23 V
1.23 V
ref
Sense
5
Gnd
NOTES: 1. For stability: C ≥ 1.0 µF, C ≥ 4.7 µF, ESR < 10 Ω at 10 kHz
s
O
2. Recommended for application: C = C = 10 µF
s
O
5
MOTOROLA ANALOG IC DEVICE DATA
L4949
OPERATING DESCRIPTION
Figure 13. Output Voltage versus Supply Voltage
The L4949 is a monolithic integrated low dropout voltage
regulator. Several outstanding features and auxiliary
functions are implemented to meet the requirements of
supplying microprocessor systems in automotive
applications. Nevertheless, it is suitable also in other
applications where the present functions are required. The
modular approach of this device allows the use of other
features and functions independently when required.
V
out
V
out
5.0 V
Voltage Regulator
The voltage regulator uses an isolated Collector Vertical
PNP transistor as a regulating element. With this structure,
very low dropout voltage at currents up to 100 mA is
obtained. The dropout operation of the standby regulator is
maintained down to 3.0 V input supply voltage. The output
voltage is regulated up to the transient input supply voltage of
35 V. With this feature no functional interruption due to
overvoltage pulses is generated.
0 V
2.0 V
5.0 V
35 V
V
CC
The typical curve showing the standby output voltage as a
function of the input supply voltage is shown in Figure 13.
The current consumption of the device (quiescent current)
is less than 200 µA.
To reduce the quiescent current peak in the undervoltage
region and to improve the transient response in this region,
the dropout voltage is controlled. The quiescent current as a
function of the supply input voltage is shown in Figure 14.
Figure 14. Quiescent Current versus Supply Voltage
3.0
T
= 25°C
2.5
2.0
1.5
J
R
= 100 Ω
L
Short Circuit Protection:
The maximum output current is internally limited. In case
of short circuit, the output current is foldback current limited
as described in Figure 12.
1.0
0.5
0
R
= 5.0 k
20
L
0
5.0
10
15
25
30
Figure 12. Foldback Characteristic of V
out
V
, SUPPLY VOLTAGE (V)
CC
10
Preregulator
To improve the transient immunity a preregulator stabilizes
the internal supply voltage to 6.0 V. This internal voltage is
present at Pin 3 (V ). This voltage should not be used as an
Z
5.0
output because the output capability is very small (≤ 100 µA).
This output may be used as an option when better
transient behavior for supply voltages less than 8.0 V is
required. In this case a capacitor (100 nF – 1.0 µF) must be
connected between Pin 3 and Gnd. If this feature is not used
Pin 3 must be left open.
0
20
100
200
I
(mA)
out
6
MOTOROLA ANALOG IC DEVICE DATA
L4949
Reset Circuit
Standby output voltage drops below the reset threshold
only a bit longer than the reaction time results in a shorter
reset delay time.
The block circuit diagram of the reset circuit is shown in
Figure 15.
The nominal reset delay time will be generated for standby
output voltage drops longer than approximately 50 µs. The
typical reset output waveforms are shown in Figure 16.
The reset circuit supervises the output voltage. The reset
thereshold of 4.5 V is defined with the internal reference
voltage and standby output drivider.
The reset pulse delay time t , is defined with the charge
RD
time of an external capacitor C :
T
Figure 16. Typical Reset Output Waveforms
C
x 2.0 V
T
40 V
V
V
t
out
in
RD
2.0
A
V
out1
5.0 V
VRT + 0.1 V
UKT
The reaction time of the reset circuit originates from the
discharge time limitation of the reset capacitor C and is
proportional to the value of C . The reaction time of the reset
T
circuit increases the noise immunity.
T
3.0 V
t
t
R
Reset
Figure 15. Reset Circuit
t
t
RD
RD
t
RR
1.23 V V
ref
Output
Overload
Switch On
Input Drop
Dump
Switch Off
2.0 µA
22 k
Reset
Sense Comparator
C
The sense comparator compares an input signal with an
internal voltage reference of typical 1.23 V. The use of an
external voltage divider makes this comparator very flexible
in the application.
Out
T
+
2.0 V
–
It can be used to supervise the input voltage either before
or after the protection diode and to give additional information
to the microprocessor like low voltage warnings.
Reg
7
MOTOROLA ANALOG IC DEVICE DATA
L4949
OUTLINE DIMENSIONS
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
N SUFFIX
PLASTIC PACKAGE
CASE 626–05
ISSUE K
8
5
3. DIMENSIONING AND TOLERANCING PER ANSI
–B–
Y14.5M, 1982.
1
4
MILLIMETERS
INCHES
DIM
A
B
C
D
F
G
H
J
MIN
9.40
6.10
3.94
0.38
1.02
MAX
10.16
6.60
4.45
0.51
1.78
MIN
MAX
0.400
0.260
0.175
0.020
0.070
0.370
0.240
0.155
0.015
0.040
F
–A–
NOTE 2
L
2.54 BSC
0.100 BSC
0.76
0.20
2.92
1.27
0.30
3.43
0.030
0.008
0.115
0.050
0.012
0.135
K
L
C
7.62 BSC
0.300 BSC
M
N
–––
0.76
10
1.01
–––
0.030
10
0.040
STYLE 1:
J
–T–
SEATING
PLANE
PIN 1. AC IN
2. DC + IN
3. DC – IN
4. AC IN
5. GROUND
6. OUTPUT
7. AUXILIARY
N
M
D
K
G
H
8.
V
M
M
M
0.13 (0.005)
T
A
B
CC
D SUFFIX
PLASTIC PACKAGE
CASE 751–05
ISSUE S
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
D
A
E
2. DIMENSIONS ARE IN MILLIMETERS.
3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.
C
8
1
5
4
M
M
0.25
B
H
MILLIMETERS
DIM
A
A1
B
C
D
MIN
1.35
0.10
0.35
0.18
4.80
3.80
MAX
1.75
0.25
0.49
0.25
5.00
4.00
h X 45
B
C
e
A
SEATING
PLANE
E
e
1.27 BSC
H
h
L
5.80
0.25
0.40
0
6.20
0.50
1.25
7
L
0.10
A1
B
M
S
S
0.25
C
B
A
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specificallydisclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
datasheetsand/orspecificationscananddovaryindifferentapplicationsandactualperformancemayvaryovertime. Alloperatingparameters,including“Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applicationsintended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
ordeathmayoccur. ShouldBuyerpurchaseoruseMotorolaproductsforanysuchunintendedorunauthorizedapplication,BuyershallindemnifyandholdMotorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and
Opportunity/Affirmative Action Employer.
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Mfax is a trademark of Motorola, Inc.
How to reach us:
USA/EUROPE/Locations Not Listed: Motorola Literature Distribution;
JAPAN: Motorola Japan Ltd.; SPD, Strategic Planning Office, 141,
P.O. Box 5405, Denver, Colorado 80217. 1–303–675–2140 or 1–800–441–2447 4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan. 81–3–5487–8488
Customer Focus Center: 1–800–521–6274
Mfax : RMFAX0@email.sps.mot.com – TOUCHTONE 1–602–244–6609
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Motorola Fax Back System
– US & Canada ONLY 1–800–774–1848 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298
– http://sps.motorola.com/mfax/
HOME PAGE: http://motorola.com/sps/
L4949/D
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500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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