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? semiconductor components industries, llc, 2002 april, 2002 rev. 4 1 publication order number: l4949/d 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 poweron reset and input voltage sense. it is designed for supplying the microcomputer 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 regulator 1.23 v ref 2.0 v 2.0 m a reset 1.23 v sense gnd sense output (s o ) reset sense input (s i ) supply voltage (v cc ) v z output voltage (v out ) c t 38 4 6 7 5 2 1 v s + - + - preregulator 6.0 v representative block diagram http://onsemi.com (top view) pin connections 1 2 3 4 8 7 6 5 v z c t gnd s i v cc reset s o v out so8 d suffix case 751 pdip8 n suffix case 626 1 8 1 8 1 8 l4949n awl yyww alywd l4949 1 8 see detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet. ordering information a = assembly location wl, l = wafer lot yy, y = year ww, w = work week marking diagrams
l4949, ncv4949 http://onsemi.com 2 absolute maximum ratings (absolute maximum ratings indicate limits beyond which damage to the device may occur.) rating symbol value unit dc operating supply voltage v cc 28 v transient supply voltage (t < 1.0 s) v cc tr 40 v output current i out internally limited output voltage v out 20 v sense input current i si 1.0 ma sense input voltage v si v cc output voltages v reset output v reset 20 sense output v so 20 output currents ma reset output i reset 5.0 sense output i so 5.0 preregulator output voltage v z 7.0 v preregulator output current i z 5.0 ma esd protection at any pin v human body model 2000 machine model 400 thermal resistance, junctiontoair r q ja c/w p suffix, dip8 plastic package, case 626 100 d suffix, so8 plastic package, case 751 200 maximum junction temperature t j 150 c storage temperature range t stg 65 to +150 c note: esd data available upon request. electrical characteristics (v cc = 14 v, 40 c < t j < 125 c, unless otherwise specified.) characteristic symbol min typ max unit output voltage (t j = 25 c, i out = 1.0 ma) v out 4.95 5.0 5.05 v output voltage (6.0 v < v cc < 28 v, 1.0 ma < i out < 50 ma) v out 4.9 5.0 5.1 v output voltage (v cc = 35 v, t < 1.0 s, 1.0 ma < i out < 50 ma) v out 4.9 5.0 5.1 v dropout voltage v drop v i out = 10 ma 0.1 0.25 i out = 50 ma 0.2 0.40 i out = 100 ma 0.3 0.50 input to output voltage difference in undervoltage condition v io 0.2 0.4 v (v cc = 4.0 v, i out = 35 ma) line regulation (6.0 v < v cc < 28 v, i out = 1.0 ma) reg line 1.0 20 mv load regulation (1.0 ma < i out < 100 ma) reg load 8.0 30 mv current limit i lim ma v out = 4.5 v 105 200 400 v out = 0 v 100 quiescent current (i out = 0.3 ma, t j < 100 c) i qse 150 260 m a quiescent current (i out = 100 ma) i q 5.0 ma
l4949, ncv4949 http://onsemi.com 3 electrical characteristics (continued) (v cc = 14 v, 40 c < t j < 125 c, unless otherwise specified.) characteristic unit max typ min symbol reset reset threshold voltage v resth v out 0.5 v reset threshold hysteresis v resth,hys mv @ t j = 25 c 50 100 200 @ t j = 40 to +125 c 50 300 reset pulse delay (c t = 100 nf, t r 100 m s) t resd 55 100 180 ms reset reaction time (c t = 100 nf) t resr 5.0 30 m s reset output low voltage (r reset = 10 k w to v out , v cc 3.0 v) v resl 0.4 v reset output high leakage current (v reset = 5.0 v) i resh 1.0 m a delay comparator threshold v ctth 2.0 v delay comparator threshold hysteresis v ctth, hys 100 mv sense sense low threshold (v si decreasing = 1.5 v to 1.0 v) v soth 1.16 1.23 1.35 v sense threshold hysteresis v soth,hys 20 100 200 mv sense output low voltage (v si 1.16 v, v cc 3.0 v, r so = 10 k w to v out ) v sol 0.4 v sense output leakage (v so = 5.0 v, v si 1.5 v) i soh 1.0 m a sense input current i si 1.0 0.1 1.0 m a preregulator preregulator output voltage (i z = 10 m a) v z 6.3 v pin function description pin symbol description 1 v cc supply voltage 2 s i input of sense comparator 3 v z output of preregulator 4 c t reset delay capacitor 5 gnd ground 6 reset output of reset comparator 7 s o output of sense comparator 8 v out main regulator output 4.96 4.98 5.0 5.02 5.04 -40 -20 0 40 60 20 100 120 t j , junction temperature ( c) 80 v cc = 14 v i out = 1.0 ma v out , output voltage (v) 0 2.0 3.0 4.0 6.0 010 v cc , supply voltage (v) 1.0 1.0 t j = 25 c r l = 100 w r l = 5.0 k 5.0 v out , output voltage (v) 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 figure 1. output voltage versus junction temperature figure 2. output voltage versus supply voltage typical characterization curves
l4949, ncv4949 http://onsemi.com 4 0 100 150 200 250 0.1 100 i out , output current (ma) 10 1.0 50 t j = 25 c v drop , dropout voltage (mv) 0 0.10 0.20 0.30 0.40 -40 -20 0 40 60 20 100 120 t j , junction temperature ( c) 80 v drop , dropout voltage (mv) i out = 50 ma i out = 10 ma i out = 100 ma 3.0 2.5 2.0 1.5 1.0 0.1 1.0 10 100 0.5 0 v cc = 14 v t j = 25 c i out , output current (ma) i q , quiescent current (ma) 3.0 2.5 2.0 1.5 1.0 0 5.0 10 15 20 25 30 v cc , supply voltage (v) 0.5 0 r l = 5.0 k r l = 100 w t j = 25 c i q , quiescent current (ma) figure 3. dropout voltage versus output current figure 4. dropout voltage versus junction temperature figure 5. quiescent current versus output current figure 6. quiescent current versus supply voltage typical characterization curves (continued) 6.0 5.0 4.0 3.0 2.0 4.0 4.1 v out , output voltage (v) 1.0 0 resistor 10 k from reset output to 5.0 v t j = 25 c v reset , reset output (v) 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 4.7 4.66 4.62 4.58 4.5 -40 -20 t j , junction temperature ( c) 4.46 4.42 upper threshold v reset , reset threshold voltage (v) 0 20 40 60 80 100 120 4.54 lower threshold figure 7. reset output versus regulator output voltage figure 8. reset thresholds versus junction temperature
l4949, ncv4949 http://onsemi.com 5 6.0 5.0 4.0 2.0 1.0 1.15 v si , sense input voltage (v) 1.0 0 t j = 25 c v so , sense output voltage (v) 1.2 1.25 1.3 1.35 1.4 1.45 1.5 3.0 resistor 10 k from sense output to 5.0 v 1.1 1.05 1.4 1.38 1.36 1.34 1.3 -40 -20 t j , junction temperature ( c) 1.28 1.2 upper threshold v si , sense input voltage (v) 0 20 40 60 80 100 120 1.32 lower threshold 1.26 1.24 1.22 figure 9. sense output versus sense input voltage figure 10. sense thresholds versus junction temperature typical characterization curves (continued) 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/ m s. for supply voltages less than 8.0 v supply transients of more than 0.4 v/ m 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 m f) reduces also the output noise. s o v z (optional) v out v out v bat c s c o c3 r so 10 k w regulator 1.23 v ref 2.0 v 2.0 m a reset 1.23 v sense gnd reset s i v cc c t 38 4 6 7 5 2 1 v cc + - + - preregulator 6.0 v 10 k w figure 11. application schematic notes: 1. for stability: c s 1.0 m f, c o 4.7 m f, esr < 10 w at 10 khz 2. recommended for application: c s = c o = 10 m f
l4949, ncv4949 http://onsemi.com 6 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 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 m 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: the maximum output current is internally limited. in case of short circuit, the output current is foldback current limited as described in figure 12. 0 5.0 20 100 200 i out (ma) figure 12. foldback characteristic of v out v out (v) 10 v out 5.0 v 35 v 5.0 v 2.0 v 0 v v out v cc figure 13. output voltage versus supply voltage 3.0 figure 14. quiescent current versus supply voltage 2.5 2.0 1.5 1.0 0 5.0 10 15 20 25 30 v cc , supply voltage (v) 0.5 0 r l = 5.0 k r l = 100 w t j = 25 c i q , quiescent current (ma) 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 z ). this voltage should not be used as an output because the output capability is very small ( 100 m 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 m f) must be connected between pin 3 and gnd. if this feature is not used pin 3 must be left open.
l4949, ncv4949 http://onsemi.com 7 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 t rd , is defined with the charge time of an external capacitor c t : t rd c t x2.0v 2.0 a the reaction time of the reset circuit originates from the discharge time limitation of the reset capacitor c t and is proportional to the value of c t . the reaction time of the reset circuit increases the noise immunity. 1.23 v v ref 22 k out reg 2.0 m a c t 2.0 v + - reset figure 15. 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 nominal reset delay time will be generated for standby output voltage drops longer than approximately 50 m s. the typical reset output waveforms are shown in figure 16. vrt + 0.1 v 5.0 v ukt v out 3.0 v reset v out1 v in 40 v t t r t rd t rd t rr switch on input drop dump output overload switch off figure 16. typical reset output waveforms 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.
l4949, ncv4949 http://onsemi.com 8 ordering information device operating temperature range package shipping l4949n dip8 50 units / rail l4949d t =40 c to +125 c so8 98 units / rail l4949dr2 t j = 40 c to +125 c so8 2500 units / tape & reel ncv4949dr2* so8 2500 units / tape & reel *ncv4949: t low = 40 c, t high = +125 c. guaranteed by design. ncv prefix is for automotive and other applications requiring site and change control.
l4949, ncv4949 http://onsemi.com 9 package dimensions n suffix plastic package case 62605 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. 14 5 8 f note 2 a b t seating plane h j g d k n c l m m a m 0.13 (0.005) b m t dim min max min max inches millimeters a 9.40 10.16 0.370 0.400 b 6.10 6.60 0.240 0.260 c 3.94 4.45 0.155 0.175 d 0.38 0.51 0.015 0.020 f 1.02 1.78 0.040 0.070 g 2.54 bsc 0.100 bsc h 0.76 1.27 0.030 0.050 j 0.20 0.30 0.008 0.012 k 2.92 3.43 0.115 0.135 l 7.62 bsc 0.300 bsc m --- 10 --- 10 n 0.76 1.01 0.030 0.040
l4949, ncv4949 http://onsemi.com 10 package dimensions d suffix plastic package case 75107 issue w seating plane 1 4 5 8 n j x 45 k 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. a b s d h c 0.10 (0.004) dim a min max min max inches 4.80 5.00 0.189 0.197 millimeters b 3.80 4.00 0.150 0.157 c 1.35 1.75 0.053 0.069 d 0.33 0.51 0.013 0.020 g 1.27 bsc 0.050 bsc h 0.10 0.25 0.004 0.010 j 0.19 0.25 0.007 0.010 k 0.40 1.27 0.016 0.050 m 0 8 0 8 n 0.25 0.50 0.010 0.020 s 5.80 6.20 0.228 0.244 x y g m y m 0.25 (0.010) z y m 0.25 (0.010) z s x s m
l4949, ncv4949 http://onsemi.com 11 notes
l4949, ncv4949 http://onsemi.com 12 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 circui t, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. atypicalo parameters which may b e provided in scillc data sheets and/or specifications can and do vary in dif ferent applications and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. scillc does not convey any license under its paten t 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 sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indem nify and hold scillc and its of ficers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and re asonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized u se, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employ er. publication ordering information japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. l4949/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com n. american technical support : 8002829855 toll free usa/canada

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