View TC4949_431893.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Multifunction Very Low Dropout Voltage Regulator
TC4949 TC4949 Multifunction Very Low Dropout Voltage Regulator
FEATURES
s s s s s s s s s s Operating DC Supply Voltage Range 5.0V to 28V Transient Supply Voltage up to 40V Extremely Low Quiescent Current in Standby Mode High Precision Standby Output Voltage 5.0V 1% Output Current Capability up to 100mA Very Low Dropout Voltage less than 0.4V Reset Circuit Sensing the Output Voltage Programmable Reset Pulse Delay with External Capacitor Voltage Sense Comparator Thermal Shutdown and Short Circuit Protections
GENERAL DESCRIPTION
The TC4949 is a monolithic integrated 5.0V 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.
ORDERING INFORMATION
Part Number TC4949VPA TC4949VOA Package 8-Pin PDIP (Narrow) 8-Pin SOIC (Narrow) Temperature Range -40 to +125C -40 to +125C
REPRESENTATIVE BLOCK DIAGRAM
Output Voltage (VOUT) VZ 3 CT 4 8 Preregulator 6.0V 2.0A
+ - + -
PIN CONFIGURATIONS 8-Pin PDIP
VCC 1
Reset 6
Supply Voltage (VCC) 1
8 VOUT
SIN 2 VZ 3 CT 4
TC4949
7 SOUT 6 RESET 5 GND
Regulator Sense Input (SIN) 2 1.23VREF VS
+ -
2.0V Sense Output (SOUT)
+ -
Reset
7
8-Pin SOIC
VCC 1 SIN 2 VZ 3 8 VOUT 7 SOUT
+ 1.23V Sense
5 Gnd
TC4949
6 RESET 5 GND
w
w
w
.d
ee sh ta a
u. t4
om c
CT 4
TC4949-1 1/6/00
1 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.
www..com
Multifunction Very Low Dropout Voltage Regulator
TC4949
ABSOLUTE MAXIMUM RATINGS*
DC Operating Supply Voltage ......................... VCC = 28V Transient Supply Voltage (T < 1.0 s) ........... VCC TR = 40V Output Current ............................. IOUT (Internally Limited) Output Voltage ............................................... VOUT = 20V Sense Input Current ...................................... ISI = 1.0mA Sense Input Voltage ............................................ VSI =VCC Output Voltages Reset Output ........................................ VRESET = 20V Sense Output ............................................. VSO = 20V Output Currents Reset Output ..................................... IRESET = 5.0mA Sense Output ...........................................ISO = 5.0mA Preregulator Output Voltage ............................. VZ = 7.0V Preregulator Output Current ............................. IZ = 5.0mA ESD Protection at any pin Human Body Model .......................................... 2000V Machine Model ................................................... 400V Thermal Resistance, Junction-to-Air P Suffix, DIP-8 Plastic Package, Case 626 ............................................ JA = 100C/W D Suffix, SO-8 Plastic Package, Case 751 ............................................ JA = 200C/W Maximim Junction Temperature ...................... TJ = 150C Storage Temperature Range .......... TSTG = -65 to +150C
*This is a stress rating only, and functional operation of the device at these or any other conditions beyond those indicated in the operation section of the specifications is not implied. Exposure to absolute maximum ratings conditions for extended periods of time may affect device reliability.
ELECTRICAL CHARACTERISTICS: (VCC = 14V, -40C < TJ < 125C, unless otherwise specified)
Symbol
VOUT
Parameter
Output Voltage
Test Conditions
TJ = 25C, IOUT = 1.0mA 6.0V < VCC < 28V, 1.0mA < IOUT < 50mA VCC = 35V, t < 1.0 s, 1.0mA < IOUT < 50mA IOUT = 10mA IOUT = 50mA IOUT = 100mA
Min
4.95 4.9 4.9 - - -
Typ
5.0 5.0 5.0 0.1 0.2 0.3
Max
5.05 5.1 5.1 0.25 0.40 0.50
Units
V
VDROP
Dropout Voltage
V
VIO
REGLINE REGLOAD ILIM IQSE IQ RESET VRESTH VRESTH,HYS
Input to Output Voltage Difference in Undervoltage Condition Line Regulation Load Regulation Current Limit Quiescent Current
VCC = 4.0V, IOUT = 35mA 6.0V < VCC < 28V, IOUT = 1.0mA 1.0mA < IOUT < 100mA VOUT = 4.5V VOUT = 0V IOUT = 0.3mA, TJ < 100C IOUT = 100mA
- - - 105 - - -
0.2 1.0 8.0 200 100 150 -
0.4 20 30 400 - 260 5.0
V mV mV mA A mA
Reset Threshold Voltage Reset Threshold Hysteresis
- 50 50 55 - - - - -
VOUT - 0.5 100 - 100 5.0 - - 2.0 100
- 200 300 180 30 0.4 1.0 - -
V mV ms s V A V mV
TRESD TRESR VRESL IRESH VCTTH VCTTH, HYS
@TJ = 25C @TJ = -40 to +125C Reset Pulse Delay CT = 100nF, TR 100s Reset Reaction Time CT = 100nF Reset Output Low Voltage RRESET = 10k to VOUT , VCC 3.0V Reset Output High Leakage Current VRESET = 5.0V Delay Comparator Threshold Delay Comparator Threshold Hysteresis
TC4949-1 1/6/00
2
Multifunction Very Low Dropout Voltage Regulator
TC4949
ELECTRICAL CHARACTERISTICS: (VCC = 14V, -40C < TJ < 125C, unless otherwise specified)
Symbol SENSE
VSOTH VSOTH,HYS VSOL ISOH ISI VZ Sense Low Threshold Sense Threshold Hysteresis Sense Output Low Voltage Sense Output Leakage Sense Input Current Preregulator Output Voltage VSI Decreasing = 1.5V to 1.0V) VSI 1.16V, VCC 3.0V, RSO = 10k to VOUT VSO = 5.0V, VSI 1.5V 1.16 20 - - 1.0 - 1.23 100 - - 0.1 6.3 1.35 200 0.4 1.0 1.0 - V mV V A A V
Parameter
Test Conditions
Min
Typ
Max
Units
PREREGULATOR
IZ = I0A
PIN DESCRIPTION
Pin 1 2 3 4 5 6 7 8 Symbol VCC SIN VZ CT GND RESET SOUT VOUT 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 CHARACTERISTICS
Figure 1. Output Voltage versus Junction Temperature
5.04
VOUT, OUTPUT VOLTAGE (V)
Figure 2. Output Voltage versus Supply Temperature
6.0
VOUT, OUTPUT VOLTAGE (V)
VCC = 14V IOUT = 1.0mA 5.02
TJ = 25C 5.0 4.0 RL = 5.0k 3.0 2.0 1.0 0 RL = 100
5.0
4.98
4.96 -40
-20
0 20 40 60 80 100 TJ, JUNCTION TEMPERATURE (C)
120
0
1.0
2.0
3.0 4.0 5.0 6.0 7.0 8.0 VCC, SUPPLY VOLTAGE (V)
9.0
10
TC4949-1 1/6/00
3
Multifunction Very Low Dropout Voltage Regulator
TC4949
TYPICAL CHARACTERISTICS
Figure 3. Dropout Voltage versus Output Current
TJ = 25C 200 150 100 50 0 0.1
Figure 4. Dropout Voltage versus Junction Temperature
VDROP, DRPOOUT VOLTAGE (mV)
VDROP, DROPOUT VOLTAGE (mV)
250
0.40 IOUT = 100mA
0.30
0.20
IOUT = 50mA IOUT = 10mA
0.10
1.0 10 IOUT, OUTPUTCURRENT (mA)
100
0 -40
-20
0
20
40
60
80
100
120
TJ, JUNCTION TEMPERATURE (C)
Figure 5. Quiescent Current versus Output Current
3.0
Figure 6. Quiescent Current versus Supply Voltage
3.0
IQ, QUIESCENT CURRENT (mA)
2.5 2.0 1.5 1.0 0.5 0 0.1
VCC = 14V TJ = 25C
IQ, QUIESCENT CURRENT (mA)
2.5 2.0 1.5 1.0 0.5 0
TJ = 25C
RL = 100
RL = 5.0k 0 5.0 10 15 20 VCC, SUPPLY VOLTAGE (V) 25 30
1.0
10
100
IOUT, OUTPUT CURRENT (mA)
VRESET, RESET THRESHOLD VOLTAGE (V)
Figure 7. Reset Output versus Regulator Output Voltage
6.0
VRESET, RESET OUTPUT (V)
Figure 8. Reset Thresholds versus Junction Temperature
4.7 4.66 Upper Threshold 4.62 4.58 4.54 4.5 4.46 4.42 -40 -20 0 20 40 60 80 100 120 Lower Threshold
TJ = 25C 5.0 4.0 3.0 2.0 1.0 0 4.0 RESISTOR 10K FROM RESET OUTPUT TO 5.0V
4.1
4.2 4.3 4.4 4.5 4.6 4.7 4.8 VOUT, OUTPUT VOLTAGE (V)
4.9
5.0
TJ, JUNCTION TEMPERATURE (C)
TC4949-1 1/6/00
4
Multifunction Very Low Dropout Voltage Regulator
TC4949
TYPICAL CHARACTERISTICS
Figure 9. Sense Output versus Sense Input Voltage
VSO, SENSE OUTPUT VOLTAGE (V)
Figure 10. Sense Thresholds versus Junction Temperature
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
6.0 5.0 4.0 3.0 2.0 1.0 0 TJ = 25C Resistor 10k from Sense Output to 5.0V
1.0 1.05 1.1 1.15 1.2
1.25 1.3 1.35 1.4 1.45 1.5
VSI, SENSE INPUT VOLTAGE (V)
TJ, JUNCTION TEMPERATURE (C)
APPLICATION INFORMATION Supply Voltage Transient
High supply voltage transients can cause a reset output signal perturbation. For supply voltages greater than 8.0V the circuit shows a high immunity of the reset output against supply transients of more than 100V/sec. For supply voltC3 VZ (optional) VBAT VCC 1 CS
ages less than 8.0V supply transients of more than 0.4V/sec can cause a reset signal perturbation.To improve the transient behavior for supply voltages less than 8.0V a capacitor at Pin 3 can be used. A capacitor at Pin 3 (C3 1.0F) reduces also the output noise.
VOUT
CO
3
8
CT
4
Preregulator 6.0V
2.0mA
+ - + -
Reset 6 10k VOUT
Regulator Reset VCC SIN
+ -
2.0V
RSO 10k SOUT
+
7
2 + 1.23VREF Sense
-
1.23V
NOTES: 1. For stability: CS 1.0F, CO 4.7F, ESR < 10W at 10kHz 2. Recommended for application: CS= CO=10F
5 Gnd
Figure 11. Application Schematic
TC4949-1 1/6/00
5
Multifunction Very Low Dropout Voltage Regulator
TC4949
OPERATING DESCRIPTION
The TC4949 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.
VOUT
5.0V
VOUT
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 100mA is obtained. The dropout operation of the standby regulator is maintained down to 3.0V input supply voltage. The output voltage is regulated up to the transient input supply voltage of 35V. 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 200A. 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.
0V 2.0V 5.0V VCC 35V
Figure 13. Output Voltage versus Supply Voltage
IQ, QUIESCENT CURRENT (mA)
3.0 2.5 2.0 1.5 1.0 0.5 0 RL = 5.0k 5.0 10 15 20 VCC, SUPPLY VOLTAGE (V) 25 30 RL = 100 TJ = 25C
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.
10
0
Figure 14. Quiescent Current versus Supply Voltage
Preregulator
To improve the transient immunity a preregulator stabilizes the internal supply voltage to 6.0V. 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 ( 100A). This output may be used as an option when better transient behavior for supply voltages less than 8.0V is required. In this case a capacitor (100nF - 1.0F) must be connected between Pin 3 and Gnd. If this feature is not used Pin 3 must be left open.
100 IOUT (mA) 200
VOUT (V)
5.0
0 20
Figure 12. Foldback Characteristic of VOUT
TC4949-1 1/6/00
6
Multifunction Very Low Dropout Voltage Regulator
TC4949
Reset Circuit
The block circuit diagram of the reset circuit is shown in Figure 15. The reset circuit supervises the output voltage. The reset thereshold of 4.5V 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:
TRD = CT x 2.0V
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 50sec. The typical reset output waveforms are shown in Figure 16.
2.0A
VOUT 5.0V VRT + 0.1V UKT 3.0V
VIN VOUT1
40V
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.
T TR
Reset
1.23V VREF 22k Out
+ -
TRD TRR
TRD Dump Output Switch Off Overload
2.0A
+
Switch On
Input Drop
Reset CT
-
Figure 16. Typical Reset Output Waveforms
+ - 2.0V Reg
Sense Comparator
The sense comparator compares an input signal with an internal voltage reference of typical 1.23V. 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.
Figure 15. Reset Circuit
TC4949-1 1/6/00
7
Multifunction Very Low Dropout Voltage Regulator
TC4949
TAPING FORM
Component Taping Orientation for 8-Pin SOIC (Narrow)
User Direction of Feed
PIN 1
User Direction of Feed
W = Width of Carrier Tape
PIN 1 Standard Reel Component Orientation for TR Suffix Device
P = Pitch
Reverse Reel Component Orientation for RT Suffix Device
Carrier Tape, Reel Size, and Number of Components Per Reel
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
8-Pin SOIC (N)
12 mm
8 mm
2500
13 in
PACKAGE DIMENSIONS
8-Pin SOIC (Narrow)
PIN 1 indicated by dot and / or beveled edge
.157 (3.99) .150 (3.81)
.244 (6.20) .228 (5.79)
.050 (1.27) TYP.
.197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) .010 (0.25) .007 (0.18) .050 (1.27) .016 (0.40)
8MAX.
Dimensions: inches(mm)
TC4949-1 1/6/00
8
Multifunction Very Low Dropout Voltage Regulator
TC4949
PACKAGE DIMENSIONS (CONT.)
8-Pin PDIP (Narrow)
PIN 1
.260 (6.60) .240 (6.10)
.045 (1.14) .030 (0.76) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92)
.070 (1.78) .040 (1.02)
.310 (7.87) .290 (7.37)
.040 (1.02) .020 (0.51)
.015 (0.38) .008 (0.20) .400 (10.16) .310 (7.87)
3MIN.
.110 (2.79) .090 (2.29)
.022 (0.56) .015 (0.38)
Dimensions: inches(mm)
Sales Offices
TelCom Semiconductor, Inc. 1300 Terra Bella Avenue P.O. Box 7267 Mountain View, CA 94039-7267 TEL: 650-968-9241 FAX: 650-967-1590 E-Mail: liter@telcom-semi.com
TC4949-1 1/6/00
TelCom Semiconductor, GmbH Lochhamer Strasse 13 D-82152 Martinsried Germany TEL: (011) 49 89 895 6500 FAX: (011) 49 89 895 6502 2
TelCom Semiconductor H.K. Ltd. 10 Sam Chuk Street, Ground Floor San Po Kong, Kowloon Hong Kong TEL: (011) 852-2350-7380 FAX: (011) 852-2354-9957
9

▲Up To Search▲

Price & Availability of TC4949

	To Download TC4949 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .