ON NCV4949A 100 ma, 5.0 v, low dropout voltage regulator with reset and sense Datasheet

NCV4949A
100 mA, 5.0 V, Low Dropout
Voltage Regulator with
Reset and Sense
The NCV4949A is a monolithic integrated 5.0 V voltage regulator
with a very low dropout and additional functions such as reset and an
uncommitted voltage sense comparator.
It is designed for supplying microcontroller/microprocessor
controlled systems particularly in automotive applications. The
NCV4949A has improved reset behavior for lower input and output
voltage levels.
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MARKING DIAGRAM
8
SOIC--8
D SUFFIX
CASE 751
8
Features











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 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
Voltage Sense Comparator
Thermal Shutdown and Short Circuit Protections
NCV Prefix for Automotive and Other Applications Requiring Site
and Change Control
 These are Pb--Free Devices
Output
Voltage (Vout)
8
VZ 3
Supply
Voltage (VCC)
CT 4
1
A
L
Y
W
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb--Free Device
PIN CONNECTIONS
VCC
1
8
Vout
Si
2
7
So
VZ
3
6
Reset
CT
4
5
GND
(Top View)
Preregulator
6.0 V
1
1
V4949A
ALYWD
G
ORDERING INFORMATION
2.0 mA
Reset
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
6
+
--
Regulator
Sense
Input
(Si)
2.0 V
Sense
Output
(So)
Reset
Vs
7
2
+
--
1.23 Vref
1.23 V
Sense
5
GND
Figure 1. Representative Block Diagram
 Semiconductor Components Industries, LLC, 2010
June, 2010 -- Rev. 0
1
Publication Order Number:
NCV4949A/D
NCV4949A
ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
Value
Unit
VCC
28
V
VCC TR
40
V
Output Current
Iout
Internally
Limited
--
Output Voltage
DC Operating Supply Voltage
Transient Supply Voltage (t < 1.0 s)
Vout
20
V
Sense Input Current
ISI
1.0
mA
Sense Input Voltage
VSI
VCC
--
Output Voltages
Reset Output
Sense Output
VReset
VSO
20
20
Output Currents
Reset Output
Sense Output
IReset
ISO
5.0
5.0
Preregulator Output Voltage
VZ
7.0
V
Preregulator Output Current
IZ
5.0
mA
ESD Protection at any pin
Human Body Model
Machine Model
---
4000
200
V
mA
V
Thermal Resistance, Junction--to--Air
D Suffix, SOIC--8 Plastic Package, Case 751
RθJA
C/W
200
Operating Junction Temperature Range
TJ
--40 to +150
C
Storage Temperature Range
Tstg
--65 to +150
C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
ELECTRICAL CHARACTERISTICS (VCC = 14 V, --40C < TA < 125C, unless otherwise specified.)
Characteristic
Symbol
Min
Typ
Max
Unit
Output Voltage (TA = 25C, Iout = 1.0 mA)
Vout
4.95
5.0
5.05
V
Output Voltage (6.0 V < VCC < 28 V, 1.0 mA < Iout < 50 mA)
Vout
4.9
5.0
5.1
V
Output Voltage (VCC = 35 V, t < 1.0 s, 1.0 mA < Iout < 50 mA)
Vout
4.9
5.0
5.1
V
Dropout Voltage
Iout = 10 mA
Iout = 50 mA
Iout = 100 mA
Vdrop
----
0.1
0.2
0.3
0.25
0.40
0.50
VIO
--
0.2
0.4
V
Line Regulation (6.0 V < VCC < 28 V, Iout = 1.0 mA)
Regline
--
1.0
20
mV
Load Regulation (1.0 mA < Iout < 100 mA)
Regload
--
8.0
30
mV
105
--
200
100
400
--
Input to Output Voltage Difference in Undervoltage Condition
(VCC = 4.0 V, Iout = 35 mA)
V
Current Limit
Vout = 4.5 V
Vout = 0 V
ILim
Quiescent Current (Iout = 0.3 mA, TA < 100C)
IQSE
--
150
260
mA
IQ
--
--
5.0
mA
Quiescent Current (Iout = 100 mA)
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2
mA
NCV4949A
ELECTRICAL CHARACTERISTICS (continued) (VCC = 14 V, --40C < TA < 125C, unless otherwise specified.)
Characteristic
Symbol
Min
Typ
Max
Unit
VResth
--
4.5
--
V
50
50
100
--
200
300
RESET
Reset Threshold Voltage
Reset Threshold Hysteresis
@ TA = 25C
@ TA = --40 to +125C
VResth,hys
mV
Reset Pulse Delay (CT = 100 nF, tR  100 ms)
tResD
55
100
180
ms
Reset Reaction Time (CT = 100 nF)
tResR
--
5.0
30
ms
Reset Output Low Voltage (RReset = 10 kΩ to Vout, VCC  3.0 V)
VResL
--
--
0.4
V
Reset Output High Leakage Current (VReset = 5.0 V)
IResH
--
--
1.0
mA
Delay Comparator Threshold
VCTth
--
2.0
--
V
VCTth, hys
--
100
--
mV
VSOth
1.16
1.23
1.35
V
VSOth,hys
20
100
200
mV
Sense Output Low Voltage (VSI  1.16 V, VCC  3.0 V, RSO = 10 kΩ to Vout)
VSOL
--
--
0.4
V
Sense Output Leakage (VSO = 5.0 V, VSI  1.5 V)
ISOH
--
--
1.0
mA
ISI
--1.0
0.1
1.0
mA
VZ
--
6.3
--
V
Delay Comparator Threshold Hysteresis
SENSE
Sense Low Threshold (VSI Decreasing = 1.5 V to 1.0 V)
Sense Threshold Hysteresis
Sense Input Current
PREREGULATOR
Preregulator Output Voltage (IZ = 10 mA)
PIN FUNCTION DESCRIPTION
Pin
Symbol
Description
1
VCC
2
Si
Input of Sense Comparator
3
VZ
Output of Preregulator
4
CT
Reset Delay Capacitor
5
GND
Ground
6
Reset
Output of Reset Comparator
7
SO
Output of Sense Comparator
8
Vout
Main Regulator Output
Supply Voltage
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NCV4949A
TYPICAL CHARACTERIZATION CURVES
60.0
0.5
Unstable Region
Vin = 13.5 V
Cout = 10 mF
40.0
30.0
0.3
0.2
20.0
0.1
10.0
0
Stable Region
Vin = 13.5 V
Cout = 10 mF
0.4
ESR (Ω)
ESR (Ω)
50.0
Stable Region
0
10
20
30
40
50
60
70
80
Unstable Region
90
0
100
0
10
20
30
OUTPUT CURRENT (mA)
5.02
5.01
5
4.99
4.98
--20
3
90
100
0
20
40
60
80
100
RL = 5 kΩ
2
RL = 100 Ω
1
0
120
0
1
2
3
4
5
6
7
8
9
10
VCC, SUPPLY VOLTAGE (V)
Figure 4. Output Voltage versus
Junction Temperature
Figure 5. Output Voltage versus
Supply Voltage
250
0.40
TJ = 25C
Vdrop , DROPOUT VOLTAGE (mV)
Vdrop , DROPOUT VOLTAGE (mV)
80
4
TJ, JUNCTION TEMPERATURE (C)
200
150
100
50
0
70
TJ = 25C
5
4.97
4.96
--40
60
6
VCC = 14 V
Iout = 1.0 mA
Vout , OUTPUT VOLTAGE (V)
Vout , OUTPUT VOLTAGE (V)
5.03
50
Figure 3. ESR Stability Border Vs. Output Current
(Very Low ESR)
Figure 2. ESR Stability Border Vs. Output
Current (Full ESR Range)
5.04
40
OUTPUT CURRENT (mA)
0.1
1.0
10
Iout = 50 mA
0.20
Iout = 10 mA
0.10
0
--40
100
Iout = 100 mA
0.30
Iout, OUTPUT CURRENT (mA)
--20
0
20
40
60
80
100
TJ, JUNCTION TEMPERATURE (C)
Figure 6. Dropout Voltage versus
Output Current
Figure 7. Dropout Voltage versus
Junction Temperature
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120
NCV4949A
TYPICAL CHARACTERIZATION CURVES (continued)
3.0
VCC = 14 V
TJ = 25C
2.5
IQ, QUIESCENT CURRENT (mA)
IQ, QUIESCENT CURRENT (mA)
3.0
2.0
1.5
1.0
0.5
0
0.1
1.0
10
2.0
RL = 100 Ω
1.5
1.0
0.5
0
100
TJ = 25C
2.5
RL = 5.0 k
0
5.0
10
VReset , RESET THRESHOLD VOLTAGE (V)
6.0
VReset , RESET OUTPUT (V)
TJ = 25C
5.0
Resistor 10 k
from Reset Output
to 5.0 V
3.0
2.0
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
4.66
4.62
4.58
4.54
4.5
Lower Threshold
4.46
4.42
--40
--20
0
60
80
100
120
1.4
VSI, SENSE INPUT VOLTAGE (V)
VSO , SENSE OUTPUT VOLTAGE (V)
40
TJ, JUNCTION TEMPERATURE (C)
TJ = 25C
Resistor 10 k
from Sense Output
to 5.0 V
2.0
1.0
0
1.0
20
Figure 11. Reset Thresholds versus
Junction Temperature
6.0
3.0
30
Upper Threshold
Vout, OUTPUT VOLTAGE (V)
4.0
25
4.7
Figure 10. Reset Output versus
Regulator Output Voltage
5.0
20
Figure 9. Quiescent Current versus
Supply Voltage
Figure 8. Quiescent Current versus
Output Current
4.0
15
VCC, SUPPLY VOLTAGE (V)
Iout, OUTPUT CURRENT (mA)
1.05
1.1
1.15
1.2
1.25
1.3
1.35
1.4
1.45
1.38
1.36
1.34
1.32
1.3
1.28
1.26
Lower Threshold
1.24
1.22
1.2
--40
1.5
Upper Threshold
VSI, SENSE INPUT VOLTAGE (V)
--20
0
20
40
60
80
100
TJ, JUNCTION TEMPERATURE (C)
Figure 12. Sense Output versus
Sense Input Voltage
Figure 13. Sense Thresholds versus
Junction Temperature
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5
120
NCV4949A
APPLICATION INFORMATION
Supply Voltage Transient
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.
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/ms. For supply voltages
Vout
C3
VZ
(optional)
Vbat
VCC
Cs
3
CO
8
CT 4
Preregulator
6.0 V
1
2.0 mA
Reset
6
10 kΩ
+
--
Regulator
Reset
VCC
RSO 10 kΩ
So
Si
7
2
+
-1.23 Vref
Sense
5 GND
NOTE:
Vout
2.0 V
1. For stability: Cs  1.0 mF, CO  4.7 mF, ESR < 10 Ω at 10 kHz
2. Recommended for application: Cs = 10 mF, CO = 10 mF to 74 mF @ TA = 125C
By using higher Cs it is possible to use higher CO.
Figure 14. Application Schematic
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1.23 V
NCV4949A
OPERATING DESCRIPTION
The NCV4949A 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. It is also suitable in other applications where
the included functions are required. The modular approach
of this device allows the use of other features and functions
independently when required.
Vout
Vout
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 a transient input supply voltage of
35 V.
A typical curve showing the standby output voltage as a
function of the input supply voltage is shown in Figure 16.
The current consumption of the device (quiescent current)
is less than 200 mA.
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 17.
0V
35 V
VCC
IQ, QUIESCENT CURRENT (mA)
3.0
The maximum output current is internally limited. In case
of short circuit, the output current is foldback current limited
as described in Figure 15.
2.5
TJ = 25C
2.0
RL = 100 Ω
1.5
1.0
0.5
0
0
RL = 5.0 k
5.0
10
15
20
25
30
VCC, SUPPLY VOLTAGE (V)
6.00
Figure 17. Quiescent Current versus Supply Voltage
5.00
Preregulator
To improve transient immunity a preregulator stabilizes
the internal supply voltage to 6.0 V. This internal voltage is
present at Pin 3 (VZ). This voltage should not be used as an
output because the output capability is very small ( 100
mA).
This output may be used to improve transient behavior for
supply voltages less than 8.0 V. In this case a capacitor (100
nF -- 1.0 mF) must be connected between Pin 3 and GND. If
this feature is not used Pin 3 must be left open.
4.00
Vout (V)
5.0 V
Figure 16. Output Voltage versus Supply Voltage
Short Circuit Protection:
3.00
2.00
1.00
0.00
2.0 V
0
50
100
150
200
Iout (mA)
250
300
350
Figure 15. Foldback Characteristic of Vout
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NCV4949A
Reset Circuit
Output voltage drops below the reset threshold only
marginally longer than the reaction time results in a shorter
reset delay time.
The nominal reset delay time will be generated for output
voltage drops longer than approximately 50ms. The typical
reset output waveforms are shown in Figure 19.
The block circuit diagram of the reset circuit is shown in
Figure 18.
The reset circuit supervises the output voltage. The reset
threshold of 4.5 V is defined by the internal reference
voltage and standby output divider.
The reset pulse delay time tRD, is defined by the charge
time of an external capacitor CT:
t
RD
=
Vout
C x 2.0 V
T
2.0 mA
Vout1
5.0 V
VRT + 0.1 V
VRT
The reaction time of the reset circuit originates from the
discharge time limitation of the reset capacitor CT and is
proportional to the value of CT. The reaction time of the reset
circuit increases the noise immunity.
3.0 V
t
tR
Reset
tRD
1.23 V Vref
22 k
2.0 mA
Switch On
Reset
+
--
tRR
Input Drop
tRD
Dump
Output
Overload
Switch Off
Figure 19. Typical Reset Output Waveforms
CT
Out
40
V
Vin
Sense Comparator
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.
It can be used to supervise the input voltage either before
or after a protection diode and to provide additional
information to the microprocessor such as low voltage
warnings.
2.0 V
Reg
Figure 18. Reset Circuit
ORDERING INFORMATION
Device
NCV4949ADR2G*
Operating Temperature Range
Package
Shipping†
TJ = --40C to +125C
SOIC--8
(Pb--Free)
2500 Units / Tape & Reel
†For information on tape and reel specifications,including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*NCV4949A: Tlow = --40C, Thigh = +125C. Guaranteed by design.
NCV prefix is for automotive and other applications requiring site and change control.
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NCV4949A
PACKAGE DIMENSIONS
SOIC--8 NB
CASE 751--07
ISSUE AJ
--X--
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
6. 751--01 THRU 751--06 ARE OBSOLETE. NEW
STANDARD IS 751--07.
A
8
5
S
B
1
0.25 (0.010)
M
Y
M
4
--Y--
K
G
C
N
DIM
A
B
C
D
G
H
J
K
M
N
S
X 45 _
SEATING
PLANE
--Z--
0.10 (0.004)
H
D
0.25 (0.010)
M
Z Y
S
X
M
J
S
MILLIMETERS
MIN
MAX
4.80
5.00
3.80
4.00
1.35
1.75
0.33
0.51
1.27 BSC
0.10
0.25
0.19
0.25
0.40
1.27
0_
8_
0.25
0.50
5.80
6.20
INCHES
MIN
MAX
0.189
0.197
0.150
0.157
0.053
0.069
0.013
0.020
0.050 BSC
0.004
0.010
0.007
0.010
0.016
0.050
0 _
8 _
0.010
0.020
0.228
0.244
SOLDERING FOOTPRINT*
1.52
0.060
7.0
0.275
4.0
0.155
0.6
0.024
1.270
0.050
SCALE 6:1
mm 
inches
*For additional information on our Pb--Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent
rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur.
Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC 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 SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an
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For additional information, please contact your local
Sales Representative
NCV4949A/D
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