simplified application schematic mcu - v bat MC33286 out1 out2 5v st2 st1 in1 in2 v batc + 5v 5v pin assignment 1 2 3 5 4 6 7 8 9 10 20 11 12 13 14 15 16 17 18 19 vbat vbat out1 out1 vbat vbat nc in 1 st1 vbatc vbat vbat out2 out2 vbat vbat nc in 2 st2 gnd 21w 21w dw suffix so20wb package case 751d-05 device operating temperature range package pc33286dw ta=-40 to +125c so20 ordering information automotive dual high side driver semiconductor technical data MC33286 advance information automotive dual high side driver semiconductor technical data motorola order number: MC33286/d rev. 5.4, 06/2001 this document contains information on a new product. specifications and information herein are subject to change without notice. ? motorola , inc. , 2001. all ri g hts reserved. tm this device is a dual high side power switch dedicated for automoive applications. in comparison with mechanical relays, this device offers higher reliability as well as protection and diagnostic features. the device consists of two independent 35m ? rdson switches in a surface mount package. it can be directly interfaced with a microcontroller for control and diagnostic functions. the device is fully protected against overcurrents, short-circuits and incorporates an overtemperature shutdown. it can be directly and continuously supplied by the battery and offers a very low quiescent current in standby mode. designed for automotive applications junction temperature range from -40 c to 150 c operating voltage range from 8v to 40v maximum breakdown voltage greater than 40v surface mount package 35m ? rdson at 25 c overtemperature protection with hysteresis under voltage shutdown reverse battery protected open load detection in on-state diagnostic output esd protection 2kv current limitation at 30a loss of ground protected standby current less than 10 a at vbat = 14v f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33286 automotive dual high side driver 2 notes : 1. during lamps inrush current. value internally limited. 2. device mounted with minimum pcb dimensions. maximum ratings ratings symbol value unit v bat and v batc voltage : continuous/pulse v bat -0.3 to 40 v out1, out2 voltage with respect to gnd : continuous/ pulse v out -0.3 to 40 v out1, out2 to v btap voltage : continuous v out 40 v st1, st2 voltage : continuous/pulse v st -0.3 to 5.5 v in1, in2 voltage : continuous/pulse v in -0.3 to 10 v in1, in2, st1, st2 current i in +/-4 ma esd all pins v esd +/-2000 v out1, out2 dc output current i out 6a out1, out2 pulse current (note 1) i outp 30 a thermal ratings junction temperature t j -40 to 150 c storage temperature t st -65 to 150 c thermal resistance junction to ambient (note 2) r thja 70 c/w electrical characteristics t j from - 40 c to +125 c, v bat from 8v to 16v, unless otherwise noted.typical values reflect approximate mean at 25 c, v bat =12v, at time of device characterization. description symbol characteristics unit conditions min typ max operating voltage v bat 840v under voltage threshold v uv 78v drain-source on resistance r dson 25 35 m ? v bat > 9v ; t j = 25 c drain-source on resistance r dson 35 50 m ? v bat > 9v ; t j = 150 c high current limitation i limh 30 a v out > 1v short-circuit current limitation i liml 10 a v out < 1v, t j = 25 c body diode forward voltage vf 0.7 v i out = -2a, tj = 25 c body diode forward voltage vf 0.6 v i out = -2a, tj = 125 c hot open load current i ol 400 700 ma device in on state standby current i stdby 10 av bat < 14v ; v in < 0.8v supply current : one channel on i on1 10 ma in1 or in 2 in high state supply current : both channels on i on2 20 ma in1 and in 2 in high state low input voltage v il 1.5 v high input voltage v ih 3.5 v input hysteresis v hyst 0.4 0.7 0.9 v input current i ih 20 100 av in = 3.5v status voltage v status 0.5 v i st = 1ma ; output in fault thermal shutdown t shut 150 c thermal shutdown hysteresis t hyst 20 c output maximum positive slew rate s rpout 0.05 0.2 0.5 v/ s load = 6 ? , v bat =12v output maximum negative slew rate s rnout 0.15 0.8 1.5 v/ s load = 6 ? , v bat =12v pwm frequency f pwm 150 hz turn-on delay time t don 100 150 s in=2.5v to 10% v out , v bat =12v f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33286 automotive dual high side driver 3 l = ? low level ? ; h = ? high level ? ; x = ? don ? t care ? figure 1. application schematic turn-off delay time t doff 100 150 s in = 2.5v to 90% v out , v bat =12v open load to status low delay time t ol 10 s functional truth table conditions in1 in2 out1 out2 st1 st2 normal operation l h l h l l h h l h l h l l h h h h h h h h h h undervoltage x x l l h h overtemperature channel 1 overtemperature channel 2 overtemperature channel 1/channel 2 h x h x h h l x l x l l l h l h l l open load channel 1 open load channel 2 h x x h h x x h l h h l overcurrent channel 1 overcurrent channel 2 h x x h x x x x h h h h electrical characteristics t j from - 40 c to +125 c, v bat from 8v to 16v, unless otherwise noted.typical values reflect approximate mean at 25 c, v bat =12v, at time of device characterization. description symbol characteristics unit conditions min typ max battery mcu out1 in1 v batc v bat 5v status pull-up load 2 out2 in2 status 2 charge pump u.v. lockout input trigger over tem p open load over current v bat v bat v bat out1 v bat v bat v bat v bat status 1 out2 gnd resistors channel 1 channel 2 thermal sensor 10k ? 10k ? load 1 v batc 100nf f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33286 pin function description automotive dual high side driver 4 pin no. name/function description 1, 2, 5, 6, 15, 16, 19, 20 v bat supply voltage these are the power supply pins of the device. these pins are directly connected with the lead frame of the package and are tied to the drain of the switching mosfet. these pins can be directly connected to the battery voltage. in addition to their supply functions, these pins participate to the thermal behaviour of the device in conducting the heat from the switching mosfet to the printed circuit board. 3, 4, 18, 17 out1 output channel 1 out 2 output channel 2 pins 3 and 4 are the output 1 terminals. pins 17 and 18 are the output 2 terminals. they are directly connected to the source of the power mosfet. the rdson is 35m ? max per output at 25 c. its value increases up to 50m ? at 150 c junction temperature. 8, 13 in 1 input channel 1 in 2 input channel 2 these are the device input pins, which directly control their associated output. the thresholds are cmos compatible. when the input is in low state, the associated output mosfet is off. when input is high, the mosfet is turned on and the load is activated. when both inputs are low, the device is in standby mode and its supply current is less than 1ma for v bat up to 12v. 9, 12 st1 status for channel 1 st2 status for channel 2 these pins are the channel 1 and 2 status. their internal structure is an open drain with an internal clamp at 6v. an external pull up connected to the 5v is needed. when the device is in normal condition the status is high. if open load or overtemperature occurs on one channel, the associated output status will be pulled low. see functional truth table. 10 v batc vbat control this pin is the supply voltage pin for the control portion of the device. it has to be connected to the v bat line and to the other v bat pins listed above. an internal 45v zener diode is connected between pin 10 and gnd. 11 gnd ground this is the gnd pin of the device. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33286 functional description automotive dual high side driver 5 general information this device is a dual high side power switch dedicated for automotive applications. in comparison with mechanical relays, this device offers higher reliability as well as protection and diagnostic features. it has been designed to be directly connected to the battery voltage. in the future, the number of electronic switches directly connected to the battery will increase, so the MC33286 includes a special input trigger and architecture which allows to have a very low standby current when the v bat is lower than 12v. the MC33286 concept uses a dual chip approach packaged in a single so20 package. this low power package can be used because the on resistance of the switch (35m ? max at 25 c) guarantees a low power dissipation (less than 300mw) when driving two 21watts lamps. the two chips are internally connected by die to die wire bonding to allow the transfer of analog and control information between the two dice. the two chips are the control and power dice. the control chip uses the smartmos3.5nvm technology. the two channels of this control chip are totally symmetrical and independant. it drives the gate of the output power mosfet and manages the analog information from the power mosfet die to ensure power device protection. the power chip uses the hdtmos3 technology. it has one independent sources plus current sensing cells for open load detection and current limitation. in addition, a thermal sensor (diode) is located in the middle of each source to protect the MC33286 against overtemperature. the drain of the power die is connected to the battery voltage by the lead frame of the package. this lead frame has been especially developed and has eight pins connected together to the v bat . these pins are used as the v bat connection as well as thermal path. supply voltage the MC33286 can be directly connected to the v bat line. figure 4 shows the supply voltage characteristics. the v batc (v bat of control die, pin 10) and v bat (v bat of power die, pins 1, 2, 5, 6, 15, 16, 19, 20) are not internally connected, so the v bat and v batc have to be connected externally by the printed circuit board. under voltage figure 4 also shows the supply voltage characteristic when one or two sides of the MC33286 are turned on. from 0v to undervoltage level (7v typical), all blocks of the MC33286 are not totally supplied. the undervoltage threshold value versus temperature is shown in figure 2.the under voltage function allows the turn-off of the output transistor, because the v bat voltage will be not enough to guarantee the full on state of the output transistor due to an incomplete drive of the gate. when the v bat is greater than the undervoltage threshold, the supply current increases due to the charge pump start up and mosfet driver activation. reverse battery protection when a negative battery voltage arises, the current flows in a reverse direction from the source region to drain region of both of the mosfets through the body diode. the limitation is then the temperature reached by the junction, which is linked to the thermal impedance from the junction to the ambiant. input trigger the MC33286 has a special input trigger circuitry allowing the device to have less than 0.5a typical standby current. when the input level is below 1.5v, the circuit is in sleep mode (see figure 4). status output the output status is an open drain structure, active at low level, so an external pull-up resistor is required to read the status information. the status indicates the open load and the over temperature information. the output short-circuit, current limitation and v bat undervoltage are not reported on the status pin. but an output short-circuit to gnd will be detected by an overtemperature because the total power dissipation of the device will make it reach the thermal detection. open load function the open load detection is active during the on phase (hot open load detection). an amplifier measures the differential volt- age between v bat and v out (this value is typically 400ma) at 25 c. an open load condition will create a voltage lower than 12mv and the open load circuitry will detect it and will pull down the sta- tus output. if the open load condition is present before the device turn-on, the status will be pulled down after a delay due to the rise time of the output. overcurrent function (high current limitation) the device incorporates a current limitation at 30 amps typical when outputs are loaded (vout > 1v) . a 21 watts lamp has a nominal current of about 2 amp and at turn on, the MC33286 has to drive a peak current of about 12a, as the lamp inrush current is about six times the nominal dc current. a standard current limitation set up at 30a will not being activated during the inrush current of one lamp but will protect the circuit against overcurrent. figure 3 shows the overcurrent threshold versus temperature. short circuit protection (low current limitation) during a hard short-circuit to gnd, the power dissipation would be 30a x 14v = 420 watts if only the overcurrent limitation exists. the thermal protection will be activated and switch the device off. nevertheless the peak power dissipation and energy is quite high. therefore, a short circuit protection has been implemented and is activated when the output voltage is lower than about 1v . as shown in the figure 5, the low current limitation decreases with temperature. in the case of a short circuit, the power dissipated in the device decreases with time due to the decay of the current limitation with temperature. overtemperature function the overtemperature function uses a thermal sensor located in the middle of each output power hdtmos transistor. the sensor is a diode connected to v bat in the power die. the diode forward voltage varies of -2mv/ c. so, by measuring the diode voltage the power output mosfet temperature is monitored. this diode voltage information is transferred to the control die and compared to a reference voltage generated from the band gap reference generator. when the temperature reaches the overtemp threshold, the circuit is turned off. as the input voltage is still high, the circuit is not in wake mode but the current consumption decreases due to the turn-off of the charge pump. the overtemperature f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33286 functional description automotive dual high side driver 6 comparator has an hysteresis which maintains the device off. as soon as the die power temperature decreases by around 20 c the device automatically switches on again. if the cause of the overtemperature has not been removed, it is likely that the device will reach the overtemperature shutdown again and will cycle off and on until the overtemperature cause is removed. as soon as the device switches off, due to overtemperature, the status pin is pulled low to inform the microcontroller that an abnormal condition has occured. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
automotive dual high side driver 7 figure 2. undervoltage threshold versus temperature figure 3. high current limitation versus temperature figure 4. battery supply current versus vbat figure 5. short circuit current limitation versus temperature figure 6. openload current threshold versus temperature figure 7. ron versus temperature 2 sides on 1 side on 2 sides off 1,0 1,1 -50 0 25 100 -25 50 75 125 1,2 1,3 1,4 1,5 0,90 0,80 0,70 8 6 4 2 0 -50 0 50 100 150 40 30 20 10 0 -50 0 50 100 200 150 temperature ( c) temperature ( c) voltage (v) temperature ( c) temperature ( c) temperature ( c) battery voltage (v) current (a) current (ma) current (a) current (ma) ron, (normalized) 8 6 4 2 0 10 12 20 15 10 5 0 -50 0 50 100 200 150 010203040 -50 0 50 100 150 600 450 300 150 0 f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
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