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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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PDIP-8 N SUFFIX CASE 626 1 1 8 8 1 SO-8 D SUFFIX CASE 751 1 A WL, L YY, Y WW, W = = = = Assembly Location Wafer Lot Year Work Week L4949 ALYWD 8 L4949N AWL YYWW
8
PIN CONNECTIONS Representative Block Diagram
Output Voltage (Vout) VZ 3 8 Supply Voltage (VCC) 1 Preregulator 6.0 V 2.0 A
VCC
CT 4
1 2 3 4 (Top View)
8 7 6 5
Vout So Reset Gnd
Si VZ CT
Reset 6 + 2.0 V Sense Output (So) 7 + 1.23 V
Regulator Sense Input (Si) 2 1.23 Vref 5 Vs
Reset
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet.
Sense Gnd
(c) Semiconductor Components Industries, LLC, 2002
1
April, 2002 - Rev. 4
Publication Order Number: L4949/D
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ELECTRICAL CHARACTERISTICS (VCC = 14 V, -40C < TJ < 125C, unless otherwise specified.)
NOTE:
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ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.)
Storage Temperature Range Maximum Junction Temperature Thermal Resistance, Junction-to-Air P Suffix, DIP-8 Plastic Package, Case 626 D Suffix, SO-8 Plastic Package, Case 751 ESD Protection at any pin Human Body Model Machine Model Preregulator Output Current Preregulator Output Voltage Output Currents Reset Output Sense Output Output Voltages Reset Output Sense Output Sense Input Voltage Sense Input Current Output Voltage Output Current Transient Supply Voltage (t < 1.0 s) DC Operating Supply Voltage
ESD data available upon request.
Quiescent Current (Iout = 100 mA)
Quiescent Current (Iout = 0.3 mA, TJ < 100C)
Current Limit Vout = 4.5 V Vout = 0 V
Load Regulation (1.0 mA < Iout < 100 mA)
Line Regulation (6.0 V < VCC < 28 V, Iout = 1.0 mA)
Input to Output Voltage Difference in Undervoltage Condition (VCC = 4.0 V, Iout = 35 mA)
Dropout Voltage Iout = 10 mA Iout = 50 mA Iout = 100 mA
Output Voltage (VCC = 35 V, t < 1.0 s, 1.0 mA < Iout < 50 mA)
Output Voltage (6.0 V < VCC < 28 V, 1.0 mA < Iout < 50 mA)
Output Voltage (TJ = 25C, Iout = 1.0 mA)
Characteristic
Rating
L4949, NCV4949
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Symbol Regload Regline Vdrop IQSE Vout Vout Vout ILim VIO IQ 4.95 Min 105 - 4.9 4.9 - - - - - - - - Symbol VCC TR VReset VSO IReset ISO RJA VCC Vout Tstg VSI Iout VZ ISI TJ IZ - - Typ 150 200 100 8.0 1.0 0.2 0.1 0.2 0.3 5.0 5.0 5.0 - -65 to +150 Internally Limited Value 2000 400 1.0 VCC 150 100 200 5.0 7.0 5.0 5.0 20 20 20 40 28 0.25 0.40 0.50 5.05 Max 260 400 - 5.0 0.4 5.1 5.1 30 20 Unit C/W mA mA mV mV Unit A mA mA mA V V V V V C C V V V V V V - -
2
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PREREGULATOR SENSE RESET
ELECTRICAL CHARACTERISTICS (continued) (VCC = 14 V, -40C < TJ < 125C, unless otherwise specified.)
Preregulator Output Voltage (IZ = 10 A)
Sense Input Current
Sense Output Leakage (VSO = 5.0 V, VSI 1.5 V)
Sense Output Low Voltage (VSI 1.16 V, VCC 3.0 V, RSO = 10 k to Vout)
Sense Threshold Hysteresis
Sense Low Threshold (VSI Decreasing = 1.5 V to 1.0 V)
Delay Comparator Threshold Hysteresis
Delay Comparator Threshold
Reset Output High Leakage Current (VReset = 5.0 V)
Reset Output Low Voltage (RReset = 10 k to Vout, VCC 3.0 V)
Reset Reaction Time (CT = 100 nF)
Reset Pulse Delay (CT = 100 nF, tR 100 s)
Reset Threshold Hysteresis @ TJ = 25C @ TJ = -40 to +125C
Reset Threshold Voltage
4.96 -40
Vout , OUTPUT VOLTAGE (V)
Vout , OUTPUT VOLTAGE (V)
4.98
5.02
5.04
Pin
5.0
8
7
6
5
4
3
2
1
-20
VCC = 14 V Iout = 1.0 mA
Vout
SO
Reset
Gnd
CT
VZ
Si
VCC
Figure 1. Output Voltage versus Junction Temperature
Symbol
TJ, JUNCTION TEMPERATURE (C)
0
20
Characteristic
40
Main Regulator Output
Output of Sense Comparator
Output of Reset Comparator
Ground
Reset Delay Capacitor
Output of Preregulator
Input of Sense Comparator
Supply Voltage
TYPICAL CHARACTERIZATION CURVES
60
80
PIN FUNCTION DESCRIPTION
100
L4949, NCV4949
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120 1.0 5.0 2.0 3.0 4.0 6.0 0 0 Description VResth,hys 1.0 VCTth, hys VSOth,hys TJ = 25C Symbol VResth VResL VSOth VCTth IResH tResR tResD VSOL ISOH VZ ISI
3
Figure 2. Output Voltage versus Supply Voltage
RL = 5.0 k 2.0 3.0 - - - - - - - - - VCC, SUPPLY VOLTAGE (V) -1.0 1.16 Min 20 55 50 50 RL = 100 4.0 5.0 - - - - Vout - 0.5 1.23 Typ 100 100 100 100 - 6.3 0.1 2.0 5.0 6.0 7.0 - - - - Max 1.35 200 180 200 300 1.0 1.0 0.4 1.0 0.4 30 8.0 9.0 mV mV mV ms A A A s V V V V V V Unit 10
L4949, NCV4949
TYPICAL CHARACTERIZATION CURVES (continued)
250 Vdrop , DROPOUT VOLTAGE (mV) Vdrop , DROPOUT VOLTAGE (mV) TJ = 25C 200 150 100 50 0 0.40 Iout = 100 mA
0.30
0.20
Iout = 50 mA Iout = 10 mA
0.10
0.1
1.0
10
100
0 -40
-20
0
20
40
60
80
100
120
Iout, OUTPUT CURRENT (mA)
TJ, JUNCTION TEMPERATURE (C)
Figure 3. Dropout Voltage versus Output Current
Figure 4. Dropout Voltage versus Junction Temperature
3.0 IQ, QUIESCENT CURRENT (mA) IQ, QUIESCENT CURRENT (mA) 2.5 2.0 1.5 1.0 0.5 0 0.1 1.0 10 100 VCC = 14 V TJ = 25C
3.0 2.5 2.0 1.5 1.0 0.5 0 0 5.0 10 15 RL = 5.0 k 20 25 30 RL = 100 TJ = 25C
Iout, OUTPUT CURRENT (mA)
VCC, SUPPLY VOLTAGE (V)
Figure 5. Quiescent Current versus Output Current
Figure 6. Quiescent Current versus Supply Voltage
TJ = 25C VReset , RESET OUTPUT (V) 5.0 4.0 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 Resistor 10 k from Reset Output to 5.0 V
VReset , RESET THRESHOLD VOLTAGE (V)
6.0
4.7 4.66 4.62 4.58 4.54 4.5 4.46 4.42 -40 -20 0 20 40 60 80 100 120 Lower Threshold Upper Threshold
Vout, OUTPUT VOLTAGE (V)
TJ, JUNCTION TEMPERATURE (C)
Figure 7. Reset Output versus Regulator Output Voltage
Figure 8. Reset Thresholds versus Junction Temperature
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L4949, NCV4949
TYPICAL CHARACTERIZATION CURVES (continued)
6.0 VSO , SENSE OUTPUT VOLTAGE (V) 5.0 4.0 3.0 2.0 1.0 0 1.0 1.05 1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 TJ = 25C Resistor 10 k from Sense Output to 5.0 V VSI, SENSE INPUT VOLTAGE (V) 1.4 1.38 1.36 1.34 1.32 1.3 1.28 1.26 1.24 1.22 1.2 -40 -20 0 20 40 60 80 100 120 Lower Threshold Upper Threshold
VSI, SENSE INPUT VOLTAGE (V)
TJ, JUNCTION TEMPERATURE (C)
Figure 9. Sense Output versus Sense Input Voltage
Figure 10. Sense Thresholds versus Junction Temperature
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
C3 VZ (optional) Vbat Cs VCC 1 Preregulator 6.0 V
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.
Vout CO
3
8
CT 4
2.0 A 6 10 k Regulator VCC Si 2 + 1.23 Vref Sense 1.23 V Reset + 2.0 V
Reset
Vout
RSO 10 k So 7
NOTES: 1. For stability: Cs 1.0 F, CO 4.7 F, ESR < 10 at 10 kHz 2. Recommended for application: Cs = CO = 10 F
5 Gnd
Figure 11. Application Schematic
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L4949, NCV4949
OPERATING DESCRIPTION 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.
Voltage Regulator
Vout
5.0 V
Vout
IQ, QUIESCENT CURRENT (mA)
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. 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 A. 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.
Short Circuit Protection:
0V
2.0 V
5.0 V
VCC
35 V
Figure 13. Output Voltage versus Supply Voltage
3.0 2.5 2.0 1.5 1.0 0.5 0 0 5.0 10 15 RL = 5.0 k 20 25 30 RL = 100 TJ = 25C
The maximum output current is internally limited. In case of short circuit, the output current is foldback current limited as described in Figure 12.
10
VCC, SUPPLY VOLTAGE (V)
Figure 14. Quiescent Current versus Supply Voltage Preregulator
5.0
0
20
100
Iout (mA)
200
To improve the 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 A). 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 F) must be connected between Pin 3 and Gnd. If this feature is not used Pin 3 must be left open.
Vout (V)
Figure 12. Foldback Characteristic of Vout
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L4949, NCV4949
Reset Circuit
The block circuit diagram of the reset circuit is shown in Figure 15. The reset circuit supervises the output voltage. The reset threshold of 4.5 V is defined with the internal reference voltage and standby output divider. The reset pulse delay time tRD, is defined with the charge time of an external capacitor CT:
t RD + C x 2.0 V T 2.0 mA
Standby output voltage drops below the reset threshold only a bit longer than the reaction time results in a shorter reset delay time. The nominal reset delay time will be generated for standby output voltage drops longer than approximately 50 s. The typical reset output waveforms are shown in Figure 16.
Vout 5.0 V VRT + 0.1 V UKT 3.0 V tR Reset tRD Vin Vout1 40 V
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.
1.23 V Vref 22 k Out 2.0 A Reset CT + Reg 2.0 V
t
tRR Input Drop
tRD Dump Output Overload Switch Off
Switch On
Figure 16. Typical Reset Output Waveforms Sense Comparator
Figure 15. Reset Circuit
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 the protection diode and to give additional information to the microprocessor like low voltage warnings.
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L4949, NCV4949
ORDERING INFORMATION
Device L4949N L4949D L4949DR2 NCV4949DR2* TJ = -40C to +125C 40C Operating Temperature Range Package DIP-8 SO-8 SO-8 SO-8 Shipping 50 Units / Rail 98 Units / Rail 2500 Units / Tape & Reel 2500 Units / Tape & Reel
*NCV4949: Tlow = -40C, Thigh = +125C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and change control.
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L4949, NCV4949
PACKAGE DIMENSIONS
N SUFFIX PLASTIC PACKAGE CASE 626-05 ISSUE L
NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. DIM A B C D F G H J K L M N MILLIMETERS MIN MAX 9.40 10.16 6.10 6.60 3.94 4.45 0.38 0.51 1.02 1.78 2.54 BSC 0.76 1.27 0.20 0.30 2.92 3.43 7.62 BSC --10_ 0.76 1.01 INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC --10_ 0.030 0.040
8
5
-B-
1 4
F
NOTE 2
-A- L
C -T-
SEATING PLANE
J N D K
M
M TA
M
H
G 0.13 (0.005) B
M
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L4949, NCV4949
PACKAGE DIMENSIONS
D SUFFIX PLASTIC PACKAGE CASE 751-07 ISSUE W
-X- A
8 5 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. DIM A B C D G H J K M N 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
B
1 4
S
0.25 (0.010)
M
Y
M
-Y- G C -Z- H D 0.25 (0.010)
M SEATING PLANE
K
N
X 45 _
0.10 (0.004)
M
J
ZY
S
X
S
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L4949, NCV4949
Notes
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L4949, NCV4949
ON Semiconductor is a trademark and is a registered trademark 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 Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: ONlit@hibbertco.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada JAPAN: ON Semiconductor, Japan Customer Focus Center 4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan 141-0031 Phone: 81-3-5740-2700 Email: r14525@onsemi.com ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative.
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L4949/D

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