Order this document from L4949/D 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 • • • • • • • • • MULTIFUNCTION VERY LOW DROPOUT VOLTAGE REGULATOR SILICON MONOLITHIC INTEGRATED CIRCUIT 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 8 Voltage Sense Comparator 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 (Vout) VZ 3 8 Supply Voltage (VCC) CT 4 PIN CONNECTIONS Preregulator 6.0 V 1 VCC 1 2.0 µA + – Regulator Sense Input (Si) 2.0 V 2 7 So VZ 3 6 Reset CT 4 5 Gnd Sense Output (So) Reset Vs Vout Si Reset 6 8 (Top View) 7 2 + – 1.23 Vref 1.23 V ORDERING INFORMATION Sense Device 5 Gnd L4949N L4949D Operating Temperature Range TJ = –40° to +125°C Motorola, Inc. 1998 Package DIP–8 SO–8 Rev 1 L4949 ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.) ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ Rating Symbol Value Unit VCC 28 V VCC TR 40 V Output Current Iout Internally Limited – Output Voltage 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 – – 2000 400 DC Operating Supply Voltage Transient Supply Voltage (t < 1.0 s) V mA V Thermal Resistance, Junction–to–Air P Suffix, DIP–8 Plastic Package, Case 626 D Suffix, SO–8 Plastic Package, Case 751 Maximim Junction Temperature Storage Temperature Range NOTE: °C/W RθJA 100 200 TJ 150 °C Tstg –65 to +150 °C ESD data available upon request. ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ Á ÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ELECTRICAL CHARACTERISTICS (VCC = 14 V, –40°C < TJ < 125°C, unless otherwise specified.) Characteristic Symbol Min Typ Max Unit Output Voltage (TJ = 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 – – – 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 – Dropout Voltage Iout = 10 mA Iout = 50 mA Iout = 100 mA Input to Output Voltage Difference in Undervoltage Condition (VCC = 4.0 V, Iout = 35 mA) Vdrop V Current Limit Vout = 4.5 V Vout = 0 V ILim Quiescent Current (Iout = 0.3 mA, TJ < 100°C) IQSE – 150 260 µA IQ – – 5.0 mA Quiescent Current (Iout = 100 mA) 2 mA MOTOROLA ANALOG IC DEVICE DATA L4949 ELECTRICAL CHARACTERISTICS (continued) (VCC = 14 V, –40°C < TJ < 125°C, unless otherwise specified.) Characteristic Symbol Min Typ Max VResth – Vout – 0.5 – Unit ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ Á ÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ RESET Reset Threshold Voltage Reset Threshold Hysteresis @ TJ = 25°C @ TJ = –40 to +125°C V VResth,hys mV 50 50 100 – 200 300 Reset Pulse Delay (CT = 100 nF, tR ≥ 100 µs) tResD 55 100 180 ms Reset Reaction Time (CT = 100 nF) tResR – 5.0 30 µs 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 µA 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 µA ISI –1.0 0.1 1.0 µA 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 µA) PIN FUNCTION DESCRIPTION Pin Symbol Description 1 VCC Supply Voltage 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 TYPICAL CHARACTERIZATION CURVES Figure 2. Output Voltage versus Supply Voltage Figure 1. Output Voltage versus Junction Temperature 6.0 TJ = 25°C VCC = 14 V Iout = 1.0 mA Vout , OUTPUT VOLTAGE (V) Vout , OUTPUT VOLTAGE (V) 5.04 5.02 5.0 4.98 4.96 –40 –20 0 20 40 60 80 TJ, JUNCTION TEMPERATURE (°C) MOTOROLA ANALOG IC DEVICE DATA 100 120 5.0 4.0 RL = 5.0 k RL = 100 Ω 3.0 2.0 1.0 0 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 10 9.0 VCC, SUPPLY VOLTAGE (V) 3 L4949 TYPICAL CHARACTERIZATION CURVES (continued) Figure 3. Dropout Voltage versus Output Current Figure 4. Dropout Voltage versus Junction Temperature 0.40 TJ = 25°C Vdrop , DROPOUT VOLTAGE (mV) Vdrop , DROPOUT VOLTAGE (mV) 250 200 150 100 50 0 0.1 1.0 10 Iout = 100 mA 0.30 Iout = 50 mA 0.20 Iout = 10 mA 0.10 0 –40 100 –20 0 Figure 5. Quiescent Current versus Output Current IQ, QUIESCENT CURRENT (mA) IQ, QUIESCENT CURRENT (mA) VCC = 14 V TJ = 25°C 2.5 100 80 120 2.0 1.5 1.0 0.5 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) 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 Vout, OUTPUT VOLTAGE (V) 20 25 30 Figure 8. Reset Thresholds versus Junction Temperature 6.0 4.0 15 VCC, SUPPLY VOLTAGE (V) Figure 7. Reset Output versus Regulator Output Voltage VReset , RESET OUTPUT (V) 60 3.0 Iout, OUTPUT CURRENT (mA) 4 40 Figure 6. Quiescent Current versus Supply Voltage 3.0 0 20 TJ, JUNCTION TEMPERATURE (°C) Iout, OUTPUT CURRENT (mA) 4.8 4.9 5.0 4.7 4.66 Upper Threshold 4.62 4.58 4.54 4.5 Lower Threshold 4.46 4.42 –40 –20 0 20 40 60 80 100 120 TJ, JUNCTION TEMPERATURE (°C) 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 1.4 5.0 TJ = 25°C 4.0 Resistor 10 k from Sense Output to 5.0 V 3.0 1.38 VSI, SENSE INPUT VOLTAGE (V) VSO , SENSE OUTPUT VOLTAGE (V) 6.0 2.0 1.0 1.36 Upper Threshold 1.34 1.32 1.3 1.28 1.26 Lower Threshold 1.24 1.22 0 1.0 1.05 1.1 1.2 1.15 1.25 1.3 1.35 1.4 1.45 1.2 –40 1.5 0 –20 VSI, SENSE INPUT VOLTAGE (V) 20 40 60 80 100 120 TJ, JUNCTION TEMPERATURE (°C) APPLICATION INFORMATION 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. 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/µs. For supply voltages Figure 11. Application Schematic Vout C3 VZ (optional) Vbat VCC 3 CO 8 CT 4 Preregulator 6.0 V 1 Cs 2.0 µA Reset 6 10 kΩ + – Vout 2.0 V Regulator Reset VCC RSO 10 kΩ So Si 7 2 + – 1.23 Vref 1.23 V Sense 5 Gnd NOTES: 1. For stability: Cs ≥ 1.0 µF, CO ≥ 4.7 µF, ESR < 10 Ω at 10 kHz 2. Recommended for application: Cs = CO = 10 µF MOTOROLA ANALOG IC DEVICE DATA 5 L4949 OPERATING DESCRIPTION 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. 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. 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. Vout Vout 5.0 V 0V 2.0 V 5.0 V 35 V VCC Figure 14. Quiescent Current versus Supply Voltage 3.0 2.5 TJ = 25°C 2.0 RL = 100 Ω 1.5 1.0 0.5 0 0 Figure 12. Foldback Characteristic of Vout RL = 5.0 k 5.0 10 15 20 25 30 VCC, SUPPLY VOLTAGE (V) 10 Vout (V) Figure 13. Output Voltage versus Supply Voltage IQ, QUIESCENT CURRENT (mA) 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. 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 (VZ). This voltage should not be used as an 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. 5.0 0 20 100 200 Iout (mA) 6 MOTOROLA ANALOG IC DEVICE DATA L4949 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 4.5 V is defined with the internal reference voltage and standby output drivider. The reset pulse delay time tRD, is defined with the charge time of an external capacitor CT: t RD + 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 µs. The typical reset output waveforms are shown in Figure 16. Figure 16. Typical Reset Output Waveforms C x 2.0 V T 2.0 mA Vout 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. 40 V Vin Vout1 5.0 V VRT + 0.1 V UKT 3.0 V t tR Reset Figure 15. Reset Circuit tRD tRR 1.23 V Vref 22 k Out Switch On 2.0 µA Input Drop tRD Dump Output Overload Switch Off Reset CT + – 2.0 V Reg MOTOROLA ANALOG IC DEVICE DATA 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 the protection diode and to give additional information to the microprocessor like low voltage warnings. 7 L4949 OUTLINE DIMENSIONS 8 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. N SUFFIX PLASTIC PACKAGE CASE 626–05 ISSUE K 5 –B– 1 4 F –A– NOTE 2 L C STYLE 1: PIN 1. 2. 3. 4. 5. 6. 7. 8. J –T– N SEATING PLANE D M K G H 0.13 (0.005) T A M B M M D SUFFIX PLASTIC PACKAGE CASE 751–05 ISSUE S D A 5 0.25 H E M B M 1 4 h B X 45 _ e q A C SEATING PLANE L 0.10 A1 B 0.25 M DIM A A1 B C D E e H h L q C B S A 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 NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 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 AC IN DC + IN DC – IN AC IN GROUND OUTPUT AUXILIARY VCC DIM A B C D F G H J K L M N MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.18 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0_ 7_ S 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 specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola 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. 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Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. Mfax is a trademark of Motorola, Inc. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 1–303–675–2140 or 1–800–441–2447 JAPAN: Motorola Japan Ltd.; SPD, Strategic Planning Office, 141, 4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan. 81–3–5487–8488 Customer Focus Center: 1–800–521–6274 Mfax: [email protected] – TOUCHTONE 1–602–244–6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 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/ 8 ◊ MOTOROLA ANALOG IC DEVICEL4949/D DATA