device operating temperature range package semiconductor technical data high energy ignition circuit ordering information mc3334p mc3334d t a = 40 to +125 c plastic dip so8 order this document by mc3334/d p suffix plastic package case 626 8 1 d suffix plastic package case 751 (so8) mcc3334 chip MCCF3334 flipchip 1 motorola analog ic device data
this device is designed to use the signal from a reluctor type ignition pickup to produce a well controlled output from a power darlington output transistor. ? very low peripheral component count ? no critical system resistors ? wide supply voltage operating range (4.0 v to 24 v) ? overvoltage shutdown (30 v) ? dwell automatically adjusts to produce optimum stored energy without waste ? externally adjustable peak current ? available in chip and flipchip form ? transient protected inputs and outputs maximum ratings rating symbol value unit power supply voltagesteady state transient 300 ms or less v bat 24 90 v output sink currentsteady state transient 300 ms or less i o(sink) 300 1.0 ma a junction temperature t j(max) 150 c operating temperature range t a 40 to +125 c storage temperature range tstg 65 to +150 c power dissipation, plastic package, case 626 derate above 25 c p d 1.25 10 w mw/ c figure 1. block diagram and typical application **a 350 v zener clamp is required when using the standard mj10012. ** this clamp is not required if a selected version with v ceo(sus) 550 v is used. *optional parts for extended transient protection + + reluctor pickup 1.35h v t s t c1* 470 c2* 0.01 r a 20k r l 10k r b 20k 5 s1 s2 4 c 3 c dwell 0.1 c filter 0.1 rbat 300 4.0 v bat 24 vdc ignition coil primary 8.0mh **mj10012 r gain 5.0k r drive 100 rs 0.075 r d1 35350 1 power ground sense ground mc3334 v cc 6 7 i o 8 i l r d2 100 power output & ovp current limit sense dwell reference buffer input comparator with hysteresis + 2 ? motorola, inc. 1996 rev 0
mc3334 mcc3334 MCCF3334 2 motorola analog ic device data electrical characteristics (t a = 40 to +125 c, v bat = 13.2 vdc, circuit of figure 1, unless otherwise noted.) characteristics symbol min typ max unit internal supply voltage, pin 6 v bat = 4.0 vdc v bat = 8.0 vdc v bat = 12.0 v bat = 14.0 v cc 3.5 7.2 10.4 11.8 vdc ignition coil current peak, cranking rpm 2.0 hz to 27 hz v bat = 4.0 vdc v bat = 6.0 v bat = 8.0 v bat = 10.0 i o(pk) 3.0 4.0 4.6 5.1 3.4 5.2 5.3 5.4 a pk ignition coil current peak, normal rpm frequency = 33 hz frequency = 133 hz frequency = 200 hz frequency = 267 hz frequency = 333 hz i o(pk) 5.1 5.1 4.2 3.4 2.7 5.5 5.5 5.4 4.4 3.4 a pk ignition coil ontime, normal rpm range frequency = 33 hz frequency = 133 hz frequency = 200 hz frequency = 267 hz frequency = 333 hz t on 7.5 5.0 4.0 3.0 2.3 14.0 5.9 4.6 3.6 2.8 ms shutdown voltage v bat 25 30 35 vdc input threshold (static test) turnon turnoff v s2 v s1 360 90 mvdc input threshold hysteresis v s2 v s1 75 mvdc input threshold (active operation) turnon turnoff v s2 1.8 1.5 vdc total circuit lag from t s (figure 1) until ignition coil current falls to 10% 60 120 m s ignition coil current fall time (90% to 10%) 4.0 m s saturation voltage ic output (pin 7) (r drive = 100 w ) v bat = 10 vdc v bat = 30 vdc v bat = 50 vdc v ce(sat) 120 280 540 mvdc current limit reference, pin 8 v ref 120 160 190 mvdc figure 2. ignition coil current versus frequency/period 333 200 133 100 70 50 33 1.0 2.0 3.0 4.0 5.0 6.0 5.5 0 5 10 15 20 25 30 ms v bat = 13.2 vdc slope = v bat 1.5 v 8.0 mh i (a) f, frequency (hz) o
mc3334 mcc3334 MCCF3334 3 motorola analog ic device data circuit description the mc3334 high energy ignition circuit was designed to serve aftermarket delco fiveterminal ignition applications. this device, driving a high voltage darlington transistor, offers an ignition system which optimizes spark energy at minimum power dissipation. the ic is pinnedout to permit thick film or printed circuit module design without any crossovers. the basic function of an ignition circuit is to permit buildup of current in the primary of a spark coil, and then to interrupt the flow at the proper firing time. the resulting flyback action in the ignition coil induces the required high secondary voltage needed for the spark. in the simplest systems, fixed dwell angle produces a fixed duty cycle, which can result in too little stored energy at high rpm, and/or wasted power at low rpm. the mc3334 uses a variable dc voltage reference, stored on c dwell , and buffered to the bottom end of the reluctor pickup (s1) to vary the duty cycle at the spark coil. at high rpm, the mc3334 holds the output aoffo for approximately 1.0 ms to permit full energy discharge from the previous spark; then it switches the output darlington transistor into full saturation. the current ramps up at a slope dictated by v bat and the coil l. at very high rpm the peak current may be less than desired, but it is limited by the coil itself. as the rpm decreases, the ignition coil current builds up and would be limited only by series resistance losses. the mc3334 provides adjustable peak current regulation sensed by r s and set by r d1 , in this case at 5.5 a, as shown in figure 2. as the rpm decreases further, the coil current is held at 5.5 a for a short period. this provides a reserve for sudden acceleration, when discharge may suddenly occur earlier than expected. the peak hold period is about 20% at medium rpm, decreasing to about 10% at very low rpm. (note: 333 hz = 5000 rpm for an eight cylinder four stroke engine.) at lower v bat , the aono period automatically stretches to accommodate the slower current buildup. at very low v bat and low rpm, a common condition during cold starting, the aono period is nearly the full cycle to permit as much coil current as possible. the output stage of the ic is designed with an ovp circuit which turns it on at v bat 30 v (v cc 22 v), holding the output darlington off. this protects the ic and the darlington from damage due to load dump or other causes of excessive v bat . component values pickup series resistance = 800 w 10% @ 25 c inductance = 1.35 h @ 1.0 khz @ 15 vrms coil leakage l = 0.6 mh primary r = 0.43 w 5% @ 25 c primary l = 7.5 mh to 8.5 mh @ 5.0 a r l load resistor for pickup = 10 k w 20% r a , r b input buffer resistors provide additional transient protection to the already clamped inputs = 20 k 20% c1, c2 for reduction of high frequency noise and spark transients induced in pickup and leads; optional and noncritical r bat provides load dump protection (but small enough to allow operation at v bat = 4.0 v) = 300 w 20% c filter transient filter on v cc , noncritical c dwell stores reference, circuit designed for 0.1 m f 20% r gain r gain /r d1 sets the dc gain of the current regulator = 5.0 k 20% r d2 r d2 /r d1 set up voltage feedback from r s r s sense resistor (pdag in thick film techniques) = 0.075 w 30% r drive low enough to supply drive to the output darlington, high enough to keep v ce(sat) of the ic below darlington turnon during load dump = 100 w 20%, 5.0 w r d1 starting with 35 w assures less than 5.5 a, increasing as required to set 5.5 a r d1 = ( 100 w ) i o(pk) r s v ref v ref r d2 r gain 1.4 general layout notes the major concern in the substrate design should be to reduce ground resistance problems. the first area of concern is the metallization resistance in the power ground to module ground and the output to the r drive resistor. this resistance directly adds to the v ce(sat) of the ic power device and if not minimized could cause failure in load dump. the second concern is to reference the sense ground as close to the ground end of the sense resistor as possible in order to further remove the sensitivity of ignition coil current to ground i.r. drops. all versions were designed to provide the same pinout order viewed from the top (component side) of the board or substrate. this was done to eliminate conductor crossovers. the standard mc3334 plastic device is numbered in the industry convention, counterclockwise viewed from the top, or bonding pad side. the MCCF3334 aflipo or abumpo chip is made from reversed artwork, so it is numbered clockwise viewed from its bump side. since this chip is mounted face down, the resulting assembly still has the same counterclockwise order viewed from above the component surface. all chips have the same size and bonding pad spacing. see figure 4 for dimensions.
mc3334 mcc3334 MCCF3334 4 motorola analog ic device data figure 3. internal schematic charge up charge down dwell reference buffer x v cc 2.0 f 2.0 f 4 s1 3 c 5 s2 input comparator with hysteresis 5.2v 5.2v 5.2v 5.2v 6v cc 14v simplified internal power supply output stage with ovp and current limiting 2 sense ground 1 power ground 8 i l 7 out 21v x v cc 2.0 f 2.0 f figure 4. MCCF3334 ignition circuit bump side view + + ++ + +++ s2 5 v cc 6 out 7 i l 8 (8) bumps 7 1 mil dia. raised minimum 0.5 mils above passivated chip surface sense ground power ground 20 mils 20 mils 20 mils 50 mils 66 2 mils 76 2 mils 1 2 3 4 5.5 1 6 +1 s1 c
mc3334 mcc3334 MCCF3334 5 motorola analog ic device data p suffix plastic package case 62605 issue k d suffix plastic package case 75105 (so8) issue n outline dimensions 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 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 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 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimensions 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. seating plane 14 5 8 c k 4x p a 0.25 (0.010) m tb ss 0.25 (0.010) m b m 8x d r m j x 45 f a b t dim min max min max inches millimeters a 4.80 5.00 0.189 0.196 b 3.80 4.00 0.150 0.157 c 1.35 1.75 0.054 0.068 d 0.35 0.49 0.014 0.019 f 0.40 1.25 0.016 0.049 g 1.27 bsc 0.050 bsc j 0.18 0.25 0.007 0.009 k 0.10 0.25 0.004 0.009 m 0 7 0 7 p 5.80 6.20 0.229 0.244 r 0.25 0.50 0.010 0.019 g
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