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p-dso-8-3 step down voltage-re gulator with reset datasheet tle 6365 data sheet rev. 1.7 1 2003-06-02 functional description general the tle 6365 g is a power supply circuit es pecially designed for automotive applications. the device is based on infi neon?s power technology spt ? which allows bipolar and cmos control circuitry to be integrat ed with dmos power devices on the same monolithic circuitry. the tle 6365 g contains a buck converter and a power on reset fe ature to start up the system. the very small p-dso-8-3 smd package meets the app lication requierements. it delivers a precise 5v fully short circuit pr otected output voltage. furthermore, the build-in feat ures like under- and overvolt age lockout for supply- and output-voltage and the overtem perature shutdown feature incr ease the reliabi lity of the tle 6365 g supply system. 1overview 1.1 features ? step down converter ? supply over- and under-voltage-lockout ? low output voltage tolerance ? output overvoltage lockout ? output under-voltage- reset with delay ? overtemperature shutdown ? wide ambient operation range -40c to 125c ? wide supply voltage operation range ? very low current consumption ? very small p-dso-8 smd package type ordering code package tle 6365 g q67006-a9515 p-dso-8-3
tle 6365 data sheet rev. 1.7 2 2003-06-02 1.2 pin definitions and functions pin configuration figure 1 pin confi guration (top view) pin no symbol function 1r reference input ; an external resistor from this pin to gnd determines the refe rence current and so the oscillator / switching frequency 2ro reset output ; open drain outp ut from reset comparator with an internal pull up resistor 3buc buck-converter compensation input ; output of in ternal error amplifier; for loop-compensati on and therefore st ability connect an external r-c-series combination to gnd. 4gnd ground ; analog signal ground 5 v cc output voltage input; feedback input (with integrated resistor devider) and logic supp ly input; external blocking capacitor necessary 7buo buck converter output ; source of the integrated power-dmos 6bds buck driver supply input ; voltage to drive the buck converter powerstage 8 v s supply voltage input ; buck converter input voltage; external blocking capaci tor necessary. ro buo buc bds v s gnd p-dso-8-3 r v cc 4 3 2 18 7 6 5
tle 6365 data sheet rev. 1.7 3 2003-06-02 1.3 block diagram figure 2 block diagram 5 8 buck converter 7 2 4 undervoltage reset generator gnd v cc buo v s ro 3 buc v internal tle 6365 g biasing and v ref reference current generator and oscillator 1 r 6 bds
tle 6365 data sheet rev. 1.7 4 2003-06-02 note: stresses above those lis ted here may cause permanent damage to the device. exposure to absolute maximu m rating conditions for ex tended periods may affect device reliability. 1.4 absolute maximum ratings parameter symbol limit values unit remarks min. max. voltages supply voltage v s ? 0.3 46 v buck output voltage v buo ? 1 46 v buck driver supply voltage v bds ? 0.3 55 v buck compensation input voltage v buc ? 0.3 6.8 v logic supply voltage v cc ? 0.3 6.8 v reset output voltage v ro ? 0.3 6.8 v current reference voltage v r ? 0.3 6.8 v esd-protection (human body model; r=1,5k ? ; c=100pf) all pins to gnd v hbm ?2 2 kv temperatures junction temperature t j ? 40 150 c? storage temperature t stg ? 50 150 c?
tle 6365 data sheet rev. 1.7 5 2003-06-02 1.5 operating range parameter symbol limit values unit remarks min. max. supply voltage v s ? 0.3 40 v supply voltage v s 535v v s increasing supply voltage v s 4.5 36 v v s decreasing supply voltage v s ? 0.3 4.5 v buck-converter off buck output voltage v buo ? 0.6 40 v buck driver supply voltage v bds ? 0.3 50 v buck compensation input voltage v buc 03.0v logic supply voltage v cc 4.0 6.2 v reset output voltage v ro ? 0.3 v cc +0.3 v current reference voltage v cref 01.23v junction temperature t j ? 40 150 c thermal resistance junction ambient r thj-a 180 k/w ?
tle 6365 data sheet rev. 1.7 6 2003-06-02 1.6 electrical characteristics 8v< v s < 35v; 4.75v< v cc <5.25v; - 40c< t j <150c; r r =47k ? ; all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified no. parameter symbol li mit values unit test condition min. typ. max . 1.6.1 current consumption 1.6.1.1 current consumption; see applicatiopn circuit i s 1.5 4 ma i cc =0ma 1.6.1.2 current consumption; see applicatiopn circuit i s 510mai cc =400ma 1.6.2 under- and over-voltage lockout at v s 1.6.2.1 uv on voltage; buck conv. on v suvon 4.0 4.5 5.0 v v s increasing; 1.6.2.2 uv off voltage; buck conv. off v suvoff 3.5 4.0 4.5 v v s decreasing 1.6.2.3 uv hysteresis voltage v suvhy 0.2 0.5 1.0 v hy = on - off 1.6.2.4 ov off voltage; buck conv. off v sovoff 34 37 40 v v s increasing 1.6.2.5 ov on voltage; buck conv. on v sovon 30 33 36 v v s decreasing 1.6.2.6 ov hysteresis voltage v suvhy 1.5 4 10 v hy = off - on 1.6.3 over-voltage lockout at v cc 1.6.3.1 ov off voltage; buck conv. off v ccovoff 5.5 6.0 6.5 v v cc increasing 1.6.3.2 ov on voltage; buck conv. on v ccovon 5.25 5.75 6.25 v v cc decreasing 1.6.3.3 ov hysteresis voltage v ccovhy 0.10 0.25 0.50 v hy = off - on
tle 6365 data sheet rev. 1.7 7 2003-06-02 1.6.4 buck-converter; buo, bds, buc and v cc 1.6.4.1 logic supply voltage v cc 4.9 5.1 v 1ma < i cc < 400ma; see. appl. circuit 1.6.4.2 efficiency; see. appl. circuit 85 % i cc = 400ma; v s = 14v 1.6.4.3 power-stage on resistance r buon 0.38 0.5 ? t j =25c; i buo = 0.6a 1.6.4.4 power-stage on resistance r buon 1.0 ? i buo = 0.6a 1.6.4.5 buck overcurrent threshold i buoc 0.7 0.9 1.2 a 1.6.4.6 input current on pin v cc i cc 500 a v cc =5v 1.6.4.7 buck gate supply voltage; v bgs = v s - v bds v bgs 57.210v 1.6.5 reference input ; r (oscillator; timebase fo r buck-converter and reset) 1.6.5.1 voltage on pin r v r 1.4 v r r = 100k ? 1.6.5.2 oscillator frequency f osc 85 95 105 khz t j = 25c 1.6.5.3 oscillator frequency f osc 75 115 khz 1.6.5.4 cycle time for reset timing t cyl 1ms t cyl = 100 / f osc 1.6 electrical characteristics (cont?d) 8v< v s < 35v; 4.75v< v cc <5.25v; - 40c< t j <150c; r r =47k ? ; all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified no. parameter symbol li mit values unit test condition min. typ. max .
tle 6365 data sheet rev. 1.7 8 2003-06-02 1.6.6 reset generator; ro 1.6.6.1 reset threshold; v cc decreasing v rt 4.50 4.65 4.75 v v ro h to l or l to h transition; v ro remains low down to v cc >1v 1.6.6.2 reset low voltage v rol -0.20.4vi rol =1ma; 2.5v < v cc < v rt 1.6.6.3 reset low voltage v rol -0.20.4vi rol =0.2ma ; 1v < v cc < v rt 1.6.6.4 reset high voltage v roh v cc -0.1 v cc +0.1 vi roh = 0ma 1.6.6.5 reset pull up curent i ro 240 ? 0v < v ro < 4v 1.6.6.6 reset reaction time t rr 10 40 90 s v cc < v rt 1.6.6.7 power-up reset delay time t rd 128 t cyl v cc 4.8 v 1.6.7 thermal shutdown (b oost and buck-converter off) 1.6.7.1 thermal shutdown junction temperature t jsd 150 175 200 c 1.6.7.2 thermal switch-on junction temperature t jso 120 170 c 1.6.7.3 temperature hysteresis ? t 30 k 1.6 electrical characteristics (cont?d) 8v< v s < 35v; 4.75v< v cc <5.25v; - 40c< t j <150c; r r =47k ? ; all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified no. parameter symbol li mit values unit test condition min. typ. max .
tle 6365 data sheet rev. 1.7 9 2003-06-02 2 circuit description below some importan t sections of the tle 6365 are described in more detail. power on reset in order to avoid any system failure, a sequence of several conditions has to be passed. in case of v cc power down ( v cc < v rt for t > t rr ) a logic low signal is generated at the pin ro to reset an external micr ocontroller. when the level of v cc reaches the reset threshold v rt , the signal at ro remains low for the po wer-up reset delay time t rd before switching to high. if v cc drops below the reset threshold v rt for a time extending the reset reaction time t rr , the reset circuit is activat ed and a power down sequence of period t rd is initiated. the reset reaction time t rr avoids wrong triggeri ng caused by short ?glitches? on the v cc -line. figure 3 reset function on delay on delay invalid invalid on delay start up invalid t v cc ro h l v pg v rt t 1v typ.4,65v typ.4,70v t rd < t rr t rr < t rd t rd power sart-up normal normal failed n failed started stopped
tle 6365 data sheet rev. 1.7 10 2003-06-02 buck converter a stabilized logic supply voltage (typ. 5 v) fo r general purpose is re alized in the system by a buck converter. an external buck-inductance l bu is pwm switched by a high side dmos power transistor with t he programmed frequency (pin r). the buck converter uses the temperature compensated bandgap reference voltage (typ. 2.8 v) for its regulation loop. this reference voltage is connected to the non-inverting input of th e error amplifier and an internal voltage divider supplies the in verting input. therefor e the output voltage v cc is fixed due to the internal resistor ratio to typ. 5.0 v. the output of the error amplif ier goes to the inverting in put of the pwm comparator as well as to the buck co mpensation output buc. when the error amplifie r output voltage exce eds the sawtooth volta ge the outp ut power mos-transistor is switched on . so the duration of the outp ut transistor conduction phase depends on the v cc level. a logic signal pwm with variable pu lse width is generated. figure 4 buck converter block diagram external loop compensation is required for converter stability, and is formed by connecting a compensation resist or-capacitor series-network ( r buc , c buc ) between pin buc and gnd. gnd - + 2,8v oc comp & nand 2 r sense 18m ? - + - + - + - + v ref gate driver gnd 1,2v v thov gnd 4v v thuv h when ov at v cc h when uv at v boost l when overcurrent power d-mos pwm comp error amp ov comp uv comp l when overcurrent pwm-ff error-signal v thoc 18mv 1 inv error-ff oscillator schmitt-trigger 1 error-ramp r pin 1 v s pin 8 buo pin 7 clock ramp nor 1 >1 & & r s q q & & r s q q buc pin 3 gnd r vcc2 28r r prot1 200 ? v cc r vcc1 22r gnd r vcc4 10r3 v cc r vcc3 39r7 nor1 output stage off when h v cc pin 5 v min v max t t r t f t r v low v high t t r t f t r l when t j >175c bds pin 6 gate driver supply off when h h when error-signal < error-ramp h= off h= on
tle 6365 data sheet rev. 1.7 11 2003-06-02 in the case of overload or short-circuit at v cc (the output curre nt exceeds the buck overcurrent threshold i buoc ) the dmos output transisto r is switched off by the overcurrent comparator immediately. in order to protect the v cc input as well as the external load against catastrophic failures, an overvoltage protection is provided which sw itches off the output transistor as soon as the voltage at pin v cc exceeds the internal fi xed overvoltage threshold v ccovoff = typ. 6.0 v. also a battery underv oltage protection is implemented in the tle 6365 to avoid wrong operation of the following supp lied devices, the typical th reshold when decreasing the battery voltage is at v suvoff =typ. 4.0v.
tle 6365 data sheet rev. 1.7 12 2003-06-02 figure 5 most important waveforms of the buck converter circuit aed02673 t o v error v and v min max v t l h oclk pwm l h t t i buo buoc i dbu i t buo v t s v cc v overcurrent threshold exceeded controlled by the load-current increasing with time; error voltage overcurrent comp controlled by the error amp
tle 6365 data sheet rev. 1.7 13 2003-06-02 3 application circui t figure 6 application circuit v batt v cc c l 36v c s zd 1 d 1 l bu c bu1 d bu 10uf 220nf 220uh 100uf reset output c bu2 220nf c co 47k r r r co 470nf 100k 10nf c bot d 1 device type baw78c supplier remarks 200v; 1a; sot89 infineon d bu ss14 schottky; 100v; 1a - l bu do3316p-224 coilcraft 220h; 0.8a; 0.61 ? 5 8 buck converter 7 2 4 undervoltage reset generator gnd v cc buo v s ro 3 buc v internal tle 6365 g biasing and v ref reference current generator and oscillator 1 r 6 bds l bu b82476-a1224-m epcos 220h; 0.8a; 0.53 ?
tle 6365 data sheet rev. 1.7 14 2003-06-02 4 diagrams: oscillator and boos t/buck-converter performance in the following the behaviou r of the boost/buck-converter and the oscillator is shown. efficiency buck vs. boost voltage feedback voltage vs. junction temperature oscillator freque ncy deviation vs. junction temperature buck overcurrent threshold vs. junction temperature aed03017 s v 65 5 15 25 v 30 70 75 80 85 90 % 95 v cc = 5 v load i = 120 ma 80 ma 40 ma 4.90 5.00 4.95 4.85 4.80 5.05 -50-25 0 255075 100 c 150 5.10 5.15 t j v cc v i buo = 400 ma aed03016 j t -15 ? f osc -10 -5 0 5 khz 10 -50 -25 0 25 50 75 100 ?c 150 j t = 25 ?c referred to f osc at aed03018 -50 j t -25 0 25 50 75 100 ?c 150 0.8 i oc 0.9 1 1.1 1.2 1.3 1.4 a (buck-converter) i buoc
tle 6365 data sheet rev. 1.7 15 2003-06-02 current consumption vs. junction temperature efficiency buck vs. load oscillator frequency vs. resistor between r and gndr buck on resistance vs. junction temperature aed02940 j t 0.5 1 1.5 2 2.5 ma 3 -50 -25 0 25 50 75 100 ?c 150 boost i boost on buck on bo boost i = 0 ma = 0 ma cc i aed02942 load i 50 150 250 ma 65 70 75 80 85 % 90 rt, ht ct aed02982 r 5 10 20 50 100 200 500 1000 osc f r 10 20 50 100 200 k 1000 ? j t = 25 ?c @ khz 200 400 300 100 0 500 -50 -25 0 25 50 75 100 c 150 600 700 t j r on m ? r buon @ i buo = 600 ma 800 1000
tle 6365 data sheet rev. 1.7 16 2003-06-02 5 package outlines edition 6.99
tle 6365 data sheet rev. 1.7 17 2003-06-02 published by infineon t echnologies ag i. gr., bereichs kommunikation, st.-martin-strasse 53 d-81541 mnchen ? infineon technologies ag1999 all rights reserved. attention please! the information herein is given to describe certain components and shall not be considered as warranted characteristics. terms of delivery and rights to technical change reserved. we hereby disclaim any and all warranties, including but not limit ed to warranties of non-infringement, regarding circuits, des criptions and charts stated herein. infineon technologiesis an approved cecc manufacturer. information for further information on technology, delivery terms and conditio ns and prices please contact your nearest infineon technologi es office in germany or our infineon technologies representatives worldwide (see address list). warnings due to technical requirements components may contain dangerous substances. for information on the types in question please cont act your nearest infineon technologies office. infineon technologies components may only be used in life-support devices or systems wi th the express written approval of infin eon tech- nologies, if a failure of such components can reasonably be ex pected to cause the failure of th at life-support device or system , or to affect the safety or effectiveness of that device or system. life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. if they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

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