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automotive power data sheet rev. 1.0, 2014-03-03 tle4678-2 low drop out linear voltage regulator 5 v fixed output voltage tle4678-2ld
data sheet 2 rev. 1.0, 2014-03-03 tle4678-2 table of contents 1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 pin configuration pg-tson10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 general product characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.2 functional range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.3 thermal resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.1 description voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.2 electrical characteristics vo ltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.3 typical performance characteristics voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 6 current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.1 electrical characteristics current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.2 typical performance characteristics current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7 reset function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.1 description reset function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.2 electrical characteristics reset function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7.3 typical performance characteristics reset function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8 watchdog function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8.1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8.2 electrical characteristics watchdog function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 8.3 typical performance characteristics standard watchdog fu nction . . . . . . . . . . . . . . . . . . . . . . . . . 27 9 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 9.1 application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 9.2 selection of external components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 9.3 thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 9.4 reverse polarity protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 9.5 further application informat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 10 package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 11 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 table of contents
type package marking tle4678-2ld pg-tson10 46782ld pg-tson10 data sheet 3 rev. 1.0, 2014-03-03 low drop out linear voltage regulator 5 v fixed output voltage tle4678-2 1overview features ? output voltage 5 v 2% ? current capability 200 ma ? ultra low curr ent consumption ? very low drop out voltage ? watchdog circuit for monitoring a microprocessor with programmable load-dependent activating threshold ? reset circuit sensing the output voltage with programmable switching threshold and delay time ? reset output active low down to v q = 1 v ? separated reset and watchdog output ? excellent line transient robustness ? maximum input voltage -14 v v i +45 v ? reverse polarity protection ? short circuit protected ? overtemperature shutdown ? automotive temperature range -40 c t j 150c ? available in a small thermally enhanced pg-tson10 package ? green product (rohs compliant) ? aec qualified description the tle4678-2 is a monolithic integrated low drop out fix ed output voltage regulator for loads up to 200 ma. an input voltage of up to 45 v is regulated to an output voltage of 5 v. the integrated reset and watchdog function, as well as several protection circuits, combined with a wide operating temperature range offered by the tle4678- 2 make it suitable for supplying microproce ssor systems in auto motive environments. the watchdog circuitry will be disabled in case the output current drops be low a programmable threshold, enabling a microcontroller to switch in stand-by mode. modifying the reset threshold is possible by an optional resistor divider. the tle4678-2 is available in the tiny ther mally enhanced pg-tson10 exposed pad package.
data sheet 4 rev. 1.0, 2014-03-03 tle4678-2 block diagram 2 block diagram for details on the circuit blocks see the respective section in this data sheet. figure 1 block diagram and simplified application circuit reset and watchdog generator bandgap reference protection circuits gnd d wadj radj wi q wo ro c q c d load e. g. micro controller xc22 xx gnd i supply regulated output voltage b lockdi agr am_a ppcir cui t1.vsd tle4678-2
tle4678-2 pin configuration data sheet 5 rev. 1.0, 2014-03-03 3 pin configuration 3.1 pin configuration pg-tson10 3.1.1 pin assignment figure 2 pin assignment package 3.1.2 pin definitions an d functions pg-tson10 pin symbol function 1i regulator input and ic supply for compensating line influences, a capaci tor to gnd close to the ic pins is recommended. 3ro reset output open collector output with an intern al pull-up resistor to the output q. an additional external pull-up resistor to the output q is optional. leave open if the reset function is not needed. 4wo watchdog output open collector output with an intern al pull-up resistor to the output q. an additional external pull-up resistor to the output q is optional. leave open if the watchdog function is not needed. 5wadj watchdog activating threshold adjust an external resistor to gnd determines the watchdog activating threshold. connect directly to gnd for disabling the watchdog. connect directly to gnd if the watchdog function is not needed. connect to output q via 270 k ? resistor for permanently activating the watchdog. 6gnd ic ground interconnect with the exposed pad and heatsink area on pcb. i n.c. ro wo wadj gnd d radj wi q 1 2 3 4 56 7 8 9 10
data sheet 6 rev. 1.0, 2014-03-03 tle4678-2 pin configuration 7d reset delay and watchdog timing connect a ceramic capacitor d (pin 6) to gnd for reset delay and watchdog timing adjustment. leave only open if both, the reset and the watchdog function are not needed. 8radj reset switching threshold adjust for reset threshold adjustment connect to a voltage divider from output q to gnd. for triggering the reset at the in ternally determined threshold, connect this pin directly to gnd. connect directly to gnd if th e reset function is not needed. 9wi watchdog input positive edge triggered input, usable for microcontroller monitoring. connect to gnd if the watchdog function is not needed. 10 q 5 v regulator output block to gnd with a capacitor close to the ic pins, respecting capacitance and esr requirements given in the chapter 4.2 . 2 n. c. internally not connected connection to gnd on pcb recommended. exposed pad connect to heat sink area on pcb. interconnect with gnd. pin symbol function
tle4678-2 general product characteristics data sheet 7 rev. 1.0, 2014-03-03 4 general product characteristics 4.1 absolute maximum ratings note: stresses above the ones listed here may cause perm anent damage to the device. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 1. integrated protection func tions are designed to prevent ic destructi on under fault conditions described in the data sheet. fault conditions are considered as ?outside? normal operating range. pr otection functi ons are not designed for continuous repetitive operation. note: stresses above the ones listed here may cause perm anent damage to the device. exposure to absolute maximum rating conditions for extended periods may affect device reliability. integrated protection functions are desi gned to prevent ic destruction unde r fault conditions described in the data sheet. fault conditions are considered as ?outside? normal operating range. protection functions are not designed for continuous repetitive operation. table 1 absolute maximum ratings 1) t j = -40c to +150 c; all voltages with respect to ground, positive current flowing into pin (unless otherwise specified) 1) not subject to production test, specified by design. parameter symbol values unit note / test condition number min. typ. max. voltage rating regulator input and ic supply i v i -14 ? 45 v ? p_4.1.1 regulator output q v q -1 ? 7 v ? p_4.1.2 reset output ro v ro -0.3 ? 7 v ? p_4.1.3 reset delay and watchdog timing d v d -0.3 ? 7 v ? p_4.1.4 reset switching threshold adjust radj v radj -0.3 ? 7 v ? p_4.1.5 watchdog input wi v wi -0.3 ? 7 v ? p_4.1.6 watchdog output wo v wo -0.3 ? 7 v ? p_4.1.7 watchdog activating threshold adjust wadj v wadj -0.3 ? 7 v ? p_4.1.8 temperature junction temperature t j -40 ? 150 c ? p_4.1.9 storage temperature t stg -55 ? 150 c ? p_4.1.10 esd susceptibility esd susceptibility v esd,1 -3?3 kvhbm 2) ; pin 1 (input) only. 2) esd susceptibility, hbm accordin g to ansi/esda/jedec js001 (1.5k ? , 100 pf) p_4.1.11 esd susceptibility v esd -2?2 kvhbm 2) all pins except pin 1 (input) p_4.1.12 esd susceptibility all pins v esd -1?1 kvcdm 3) 3) esd susceptibility, charged device model ?cdm? according jedec jesd22-c101. p_4.1.13
data sheet 8 rev. 1.0, 2014-03-03 tle4678-2 general product characteristics 4.2 functional range note: within the functional range the ic operates as de scribed in the circuit description. the electrical characteristics are specifi ed within the conditions given in the re lated electrical ch aracteristics table. 4.3 thermal resistance note: this thermal data was generated in accordance wit h jedec jesd51 standards. fo r more information, go to www.jedec.org . table 2 functional range parameter symbol values unit note / test condition number min. typ. max. input voltage range for normal operation v i(nor) v q + v dr ?45v 1) 1) for specification of the output voltage v q and the drop out voltage v dr , see chapter 5 . p_4.2.1 extended input voltage range v i(ext) 3.3 ? 45 v 2) 2) the output voltage v q will follow the input voltage, but is outside the specified range. for details see chapter 5 . p_4.2.2 input voltage transient immunity d v i /d t -10 ? 20 v/s d v i 10 v; v i > 9 v; no trigger of wo, ro. 3) 3) transient measured directly at the input pin. no t subject to production test, specified by design. p_4.2.3 junction temperature t j -40 ? 150 c ? p_4.2.4 output capacitor requirements c q 10 ? ? f ? 4) 4) the minimum output capacitance requ irement is applicable for a worst ca se capacitance tolerance of 30%. p_4.2.5 output capacitor requirements esr cq ??3 ? ? 5) 5) relevant esr value at f = 10 khz. p_4.2.6 table 3 thermal resistance parameter symbol values unit note / test condition number min. typ. max. tle4678-2ld (package versions pg-tson10) junction to case 1) 1) not subject to production test, specified by design r thjc ? 16 ? k/w ? p_4.3.1 junction to ambient r thja ? 190 ? k/w footprint only 2) 2) specified r thja value is according to jedec jesd51-2,-5,-7 at natural convection on fr4 2s2p board; the product (chip+package) was simulated on a 76.2 x 114.3 x 1.5 mm3 bo ard with 2 inner copper layers (2 x 70m cu, 2 x 35m cu). where applicable a thermal via array under the ex posed pad contacted the first inner copper layer. p_4.3.2 junction to ambient r thja ? 80 ? k/w 300 mm 2 heatsink area on pcb 2) p_4.3.3 junction to ambient r thja ? 70 ? k/w 600 mm 2 heatsink area on pcb 2) p_4.3.4 junction to ambient r thja ? 67 ? k/w 2s2p pcb 2) p_4.3.5
tle4678-2 voltage regulator data sheet 9 rev. 1.0, 2014-03-03 5 voltage regulator 5.1 description voltage regulator the output voltage v q is controlled by comparing a portion of it to an internal reference and driving a pnp pass transistor accordingly. saturation cont rol as a function of the load current prevents any oversa turation of the pass element. the control loop stability depends on the ou tput capacitor c q , the load current, the chip temperature and the poles/zeros introduced by the integrated circuit. to ensure stable operation, the output capacitor?s capacitance and its equivalent series resistor esr requirements given in the chapter chapter 4.2 have to be maintained. for details see also the typical performance gr aph ?output capacitor series resistor esr cq vs. output current i q ?. also, the output capacitor shall be sized to buffer load transients. an input capacitor c i is not needed for the control loop stability, but recommended to bu ffer line influences. connect the capacitors close to the ic terminals. protection circuitry prevent the ic as well as the application fr om destruction in case of catastrophic events. these safeguards contain output curr ent limitation, reverse polarity protection as well as thermal shutdown in case of overtemperature. in order to avoid excessive power dissipation that coul d never be handled by the pass element and the package, the maximum output current is de creased at input voltages above v i =22v. the thermal shutdown circuit prevents the ic from i mmediate destruction under fault conditions (e.g. output continuously short-circuited) by switching off the power stage. after the chip has cooled down, the regulator restarts. this leads to an o scillatory behavior of the output voltage until the fault is removed. however, a junction temperature above 150 c is outside the maximum rating and therefore reduces the ic lifetime. the tle4678-2 allows a negative supply voltage. howe ver, several sma ll currents are flowing into the ic increasing its junction temperature. this has to be considered for the thermal design, respecting that the thermal protection circuit is not operatin g during reverse polarity condition. figure 3 block diagram volt age regulator circuit figure 4 output voltage vs. input voltage c esr c q bandgap reference gnd q i blockdiagram_voltageregulator.vsd saturation control current limitation temperature shutdown load supply c i regulated output voltage i q i i v q v i v t diagram_output-inputvoltage.svg v q,nom v i v dr v q d v q d t i load c q d v q d t i q,max - i load c q v i(ext),min
data sheet 10 rev. 1.0, 2014-03-03 tle4678-2 voltage regulator 5.2 electrical character istics voltage regulator table 4 electrical characteristics: voltage regulator v i = 13.5 v, t j = -40c to +150 c, all voltages with respect to ground, di rection of currents as shown in figure 3 (unless otherwise specified) parameter symbol values unit note / test condition number min. typ. max. output voltage v q 4.9 5.0 5.1 v 0 ma i q 200 ma; 8 v v i 18 v p_5.2.1 output voltage v q 4.9 5.0 5.1 v 0 ma i q 150 ma; 6 v v i 18 v p_5.2.2 output voltage v q 4.9 5.0 5.1 v 0 ma i q 100 ma; 18 v v i 32 v t j 105 c 1) 2) 1) see typical performance graph for details. p_5.2.3 output voltage v q 4.9 5.0 5.1 v 0 ma i q 10 ma; 32 v v i 45 v t j 105 c 1) 2) p_5.2.4 output voltage v q 4.9 5.0 5.1 v 0.3 ma i q 100 ma; 18 v v i 32 v 1) p_5.2.5 output voltage v q 4.9 5.0 5.1 v 0.3 ma i q 10 ma; 32 v v i 45 v 1) p_5.2.6 load regulation steady-state |d v q,load |? 5 30 mv i q = 1 ma to 150 ma; v i = 6 v p_5.2.7 line regulation steady-state |d v q,line |? 5 20 mv v i = 6 v to 32 v; i q = 5 ma p_5.2.8 power supply ripple rejection psrr 60 65 ? db f ripple = 100 hz; v ripple = 1 vpp 2) 2) parameter not subject to produ ction test; specified by design. p_5.2.9 drop out voltage v dr = v i - v q v dr ?80170mv i q = 50 ma 3) 3) measured when the output voltage v q has dropped 100 mv from its nominal value. p_5.2.10 drop out voltage v dr = v i - v q v dr ?120300mv i q = 150 ma 3) p_5.2.11 output current limitation i q,max 201 350 500 ma 0 v v q 4.8 v p_5.2.12 reverse current i q -1.5 -0.7 ? ma v i = 0 v; v q = 5 v p_5.2.13 reverse current at negative input voltage i i -2 -1 ? ma v i = -14 v; v q = 0 v p_5.2.14 overtemperature shutdown threshold t j,sd 151 ? 200 c t j increasing 2) p_5.2.15 overtemperature shutdown threshold hysteresis t j,hy ?20?k t j decreasing 2) p_5.2.16
tle4678-2 voltage regulator data sheet 11 rev. 1.0, 2014-03-03 5.3 typical performance characteristics voltage regulator output voltage v q versus junction temperature t j output current limitation i qmax versus input voltage v i dropout voltage v dr versus junction temperature t j dropout voltage v dr versus output current i q 4.92 4.94 4.96 4.98 5.00 5.02 5.04 5.06 5.08 -40 0 40 80 120 160 v q [v] t j [ c] v i = 13.5 v i q = 100 ma 0 100 200 300 400 500 0 10203040 i q,max [ma] v i [v] t j = 150 c t j = 25 c t j = -40 c 0 50 100 150 200 250 300 -40 0 40 80 120 160 v dr [mv] t j [ c] i q = 150 ma i q = 50 ma i q = 0.2 ma 0 50 100 150 200 250 300 0 50 100 150 200 v dr [mv] i q [ma] t j = 25 c t j = - 40 c t j = 150 c
data sheet 12 rev. 1.0, 2014-03-03 tle4678-2 voltage regulator reverse output current i q versus output voltage v q output capacitor series resistor esr cq versus output current i q reverse current i i versus input voltage v i power supply ripple rejection psrr versus frequency f -2.5 -2.25 -2 -1.75 -1.5 -1.25 -1 -0.75 -0.5 -0.25 0 0123456 q [ma] v q [v] t j = 150 c v i = 0v t j = -40 c t j = 25 c 0.01 0.1 1 10 100 0 50 100 150 200 esr(c q ) [ ] i q [ma] c q = 10 f t j = 25 c v i = 6..28 v stable re g ion unstable re g ion stable re g ion unstable re g ion -1 -0.8 -0.6 -0.4 -0.2 0 -14 -10.5 -7 -3.5 0 i [ma] v i [v] t j = 150 c v q = 0v t j = -40 c \\\ t j = 25 c 0 10 20 30 40 50 60 70 80 90 0.01 0.1 1 10 100 1000 psrr [db] f [khz] i q = 10 ma c q = 10 f v i = 13.5 v v ripple = 1 vpp t j = 25 c
tle4678-2 voltage regulator data sheet 13 rev. 1.0, 2014-03-03 output voltage ? v q versus output current i q output voltage ? v q versus input voltage v i load transient response line transient response 0 2 4 6 8 10 12 14 16 0 50 100 150 200 v q [mv] i q [ma] t j = 150 c v i = 6 v t j = -40 c t j = 25 c -5 -2.5 0 2.5 5 7.5 10 0 8 16 24 32 40 v q [mv] v i [v] i q = 5 ma t j = 150 c t j = 25 c t j = -40 c -200 -100 0 100 200 v q [mv] v i = 6 v c q = 10 f t j = 25 c 0 50 100 150 200 0 200 400 600 800 1000 1200 1400 i q [ma] t [us] i q = 1 .. 150 ma -100 -50 0 50 100 v q [mv] i q = 5 ma c q = 10 f t j = 25 c 5 15 25 35 -50 50 150 250 350 450 v i [v] t [us] v i = 6 .. 32 v
data sheet 14 rev. 1.0, 2014-03-03 tle4678-2 current consumption 6 current consumption 6.1 electrical characteris tics current consumption figure 5 parameter definition table 5 electrical characteristics: current consumption v i = 13.5 v, t j = -40c to +150 c, all voltages with respect to ground, di rection of currents as shown in figure 5 (unless otherwise specified). parameter symbol values unit note / test condition number min. typ. max. current consumption watchdog deactivated i q = i i - i q i q1 ?6080a i q 200 a; t j 25 c watchdog deactivated p_6.1.1 current consumption watchdog deactivated i q = i i - i q i q1 ?7085a i q 200 a; t j 85 c watchdog deactivated p_6.1.2 current consumption i q = i i - i q i q2 ?110140a i q 2 ma; t j 25 c watchdog activated p_6.1.3 current consumption i q = i i - i q i q2 ?120155a i q 2 ma; t j 85 c watchdog activated p_6.1.4 current consumption i q = i i - i q i q2 ?0.61.6ma i q = 50 ma p_6.1.5 current consumption i q = i i - i q i q2 ?26ma i q = 150 ma p_6.1.6 gnd q i currentconsumption _ p arameterdefinition .vsd c q load supply c i regulated output voltage i q i i v q + v i + i q voltage regulator
tle4678-2 current consumption data sheet 15 rev. 1.0, 2014-03-03 6.2 typical performance charac teristics current consumption current consumption i q versus junction temperature t j current consumption i q versus output current i q current consumption i q versus junction temperature t j current consumption i q versus input voltage v i 0.01 0.1 1 10 -40 0 40 80 120 i q [ma] t j [ c] wd activated i q = 2 m a i q = 50 ma i q = 150 ma 0 1 2 3 4 5 0 50 100 150 200 i q [ma] i q [ma] t j = -40 c t j = 25c --- t j = 125c 0 20 40 60 80 100 -40 0 40 80 120 i q [a] t j [ c] i q =100 ua wd deactived 0.01 0.1 1 10 100 0 10203040 i q [ma] v i [v] t j =25c i q = 100 ma i q = 10 ma
data sheet 16 rev. 1.0, 2014-03-03 tle4678-2 reset function 7 reset function 7.1 description reset function the reset function provides several features: output undervoltage reset: an output undervoltage condition is indicated by setting t he reset output ?ro? to ?low?. this signal might be used to reset a microcontroller during low supply voltage. power-on reset delay time the power-on reset delay time t d,pwr-on allows a microcontroller and oscillator to start up. this delay time is the time period from exceeding the upper reset switching threshold v rt,hi until the reset is rele ased by switching the reset output ?ro? from ?low? to ?high?. the power-on reset delay time t d,pwr-on is defined by an external delay capacitor c d connected to pin ?d? which is charged up by the delay capacitor charge current i d,ch starting from v d = 0 v. in case a power-on reset delay time t d,pwr-on different from the value for c d = 100nf is required, the delay capacitor?s value can be derived fr om the specified value given in table ?power-on reset delay time? on page 20 : c d = 100nf t d,pwr-on / t d,pwr-on,100nf (1) with ? t d,pwr-on : desired power-on reset delay time ? t d,pwr-on,100nf : power-on reset delay time specified in table ?power-on reset delay time? on page 20 ? c d : delay capaci tor required. the formula is valid for c d 10nf. for precise timing calculations cons ider also the delay capacitor?s tolerance. undervoltage reset delay time unlike the power-on reset delay time, the undervoltage reset delay time t d considers a short output undervoltage event where the delay capacitor c d is assumed to be discharged to v d = v dst,lo only before the charging sequence starts. therefore, the undervoltage reset delay time t d is defined by the delay capacitor charge current i d,ch starting from v d = v dst,lo and the external delay capacitor c d . a delay capacitor c d for a different undervoltage reset delay time as specified in table ?undervoltage reset delay time? on page 19 can be calculated similar as above: c d = 100nf t d / t d,100nf (2) with: ? t d : desired undervoltage reset delay time ? t d,100nf : power-on reset delay time specified in table ?undervoltage reset delay time? on page 19 ? c d : delay capaci tor required the formula is valid for c d 10nf. for precise timing calculations cons ider also the delay capacitor?s tolerance.
tle4678-2 reset function data sheet 17 rev. 1.0, 2014-03-03 reset reaction time in case the output voltage of the regulator drops below the output undervoltage lower reset threshold v rt,lo , the delay capacitor c d is discharged rapidly. once the delay capacito r?s voltage has reached th e lower delay switching threshold v dst,lo , the reset output ?ro? will be set to ?low?. in case of a very short drop of output voltage, may the delay capacitor voltage doesn?t reach the lower delay switch ing threshold and t herefore no ?ro? = ?low will be set. this prevents a microcontroller reset because of a very short distortion on output voltage. typically the time of this fiter effect is about 550 ns ( t rr,blank ). see also timing diagram on page 18 additionally to the delay capacitor discharge time t rr,d , an internal reaction time t rr,int applies. hence, the total reset reaction rime t rr,total becomes: t rr,total = t rr,int + t rr,d (3) with ? t rr,total : total reset reaction time ? t rr,int : internal reset re action time; see table ?internal reset reaction time? on page 20 . ? t rr,d : delay capacitor discharge time. for a capacitor c d different from the value specified in table ?delay capacitor discharge time? on page 20 , see typical performance graphs. reset ouput ?ro? the reset output ?ro? is an open collector output with an integrated pull-up resistor. in case a lower-ohmic ?ro? signal is desired, an external pull-up resistor to the output ?q? can be connected. since the maximum ?ro? sink current is limited, the opti onal external resistor r ro,ext must not below as specified in table ?reset output? on page 19 . reset output ?ro? low for v q 1v in case of an undervoltage reset condition reset output ?ro? is held ?low? for v q 1 v, even if the input voltage v i is 0 v. this is achieved by supplying the reset circuit from th e output capacitor. reset adjust function the undervoltage reset switching threshold can be adjuste d according to the application?s needs by connecting an external voltage divider ( r adj1 , r adj2 ) at pin ?radj?. for selecting the default threshold connect pin ?radj? to gnd. the reset adjustment range is given in table ?reset adjustment range? on page 19 . when dimensioning the volta ge divider, take into consid eration that there will be an additional current constantly flowing through the resistors. with a voltage divider connected, the reset switching threshold v rt,new is calculated as follows (neglecting the reset adjust pin current i radj ): v rt,new = v radj,th ( r adj,1 + r adj,2 ) / r adj,2 (4) with ? v rt,new : desired reset switching threshold. ? r adj,1 , r adj,2 : resistors of the extern al voltage divider, see figure 6 . ? v radj,th : reset adjust switching threshold given in table ?reset adjust? on page 19 .
data sheet 18 rev. 1.0, 2014-03-03 tle4678-2 reset function figure 6 block diagram reset circuit figure 7 timing diagram reset gnd q i b lockdiagram _reseta djust .vsd or supply ro v dst int. supply i d,ch i dr ,dsch v radj ,t h radj control d c d reset optional optional c q vdd micro- controller gnd r adj ,1 r adj ,2 r ro i ro i radj v i t v q t v rt,lo v rt,hi v ro t i mi n g di a g ra m_ re se t. vs t v ro,low 1 v 1v t rr,total t d ther mal shutdown input voltage dip t rr,total t d t d t < t rr,blank t d under- voltage spike at output over- load t rr,total v rh v dst,lo v dst,hi t v d
tle4678-2 reset function data sheet 19 rev. 1.0, 2014-03-03 7.2 electrical character istics reset function table 6 electrical characteristics: reset function v i = 13.5 v, t j = -40c to +150 c, all voltages with respect to ground, di rection of currents as shown in figure 6 (unless otherwise specified). parameter symbol values unit note / test condition number min. typ. max. output undervoltage r eset comparator default values (pin radj = gnd) output undervoltage reset lower switching threshold v rt,lo 4.6 4.7 4.8 v v i = 0 v v q decreasing radj = gnd p_7.2.1 output undervoltage reset upper switching threshold v rt,hi 4.7 4.8 4.9 v v i within operating range v q increasing radj = gnd p_7.2.2 output undervoltage reset switching hysteresis v rt,hy 60 120 ? mv v i within operating range radj = gnd. p_7.2.3 output undervoltage reset headroom v rh 250 300 ? mv calculated value: v q - v rt,lo v i within operating range i q = 50 ma radj = gnd p_7.2.4 reset threshold adjustment reset adjust lower switching threshold v radj,th 1.176 1.20 1.224 v v i = 0 v 3.2 v v q < 4.6 v p_7.2.5 reset adjustment range 1) v rt,range 3.20 ? 4.60 v ? p_7.2.6 reset output ro reset output low voltage v ro,low ? 0.2 0.4 v v i = 0 v; 1v v q v rt,low r ro,ext = 3.3 k ? p_7.2.8 reset output external pull-up resistor to q r ro,ext 3? ? k ? v i = 0 v; 1v v q v rt,low v ro =0.4v p_7.2.9 reset output internal pull-up resistor r ro 20 30 45 k ? internally connected to q p_7.2.10 reset delay timing upper delay switching threshold v dst,hi ? 1.21 ? v ? p_7.2.11 lower delay switching threshold v dst,lo ? 0.30 ? v ? p_7.2.12 delay capacitor charge current i d,ch ? 2.8 ? a v d = 1 v p_7.2.13 delay capacitor reset discharge current i dr,dsch ? 80 ? ma v d = 1 v p_7.2.14 undervoltage reset delay time t d,100nf 20 31 45 ms calculated value; c d = 100 nf 2) ; c d discharged to v dst,lo p_7.2.15
data sheet 20 rev. 1.0, 2014-03-03 tle4678-2 reset function power-on reset delay time t d,pwr- on,100nf 28 43 64 ms calculated value; c d = 100 nf 2) ; c d discharged to 0 v; p_7.2.16 internal reset reaction time t rr,int ?915s c d = 0 nf p_7.2.17 delay capacitor discharge time t rr,d,100nf ?1.53s c d = 100 nf 2) p_7.2.18 total reset reaction time t rr,total,100nf ? 10.5 18 s calculated value: t rr,d,100nf + t rr,int ; c d = 100 nf 2) p_7.2.19 1) related parameters ( v rt,hi , v rt,hy ) are scaled linear when the reset switching threshold is modified. 2) for programming a different delay and reset reaction time, see chapter 7.1 . table 6 electrical characteristics: reset function (cont?d) v i = 13.5 v, t j = -40c to +150 c, all voltages with respect to ground, di rection of currents as shown in figure 6 (unless otherwise specified). parameter symbol values unit note / test condition number min. typ. max.
tle4678-2 reset function data sheet 21 rev. 1.0, 2014-03-03 7.3 typical performance ch aracteristics reset function undervoltage reset switching thresholds v rt,low , v rt,high versus junction temperature t j reset delay time t d , t d,pwr-on versus delay capacitor c d 4.6 4.7 4.8 4.9 5 5.1 5.2 -40 -20 0 20 40 60 80 100 120 140 v q [v], v rt [v] t j [ c] i q = 1 ma pin radj = gnd v q v rt,hi v rt,lo 1 10 100 1000 10 100 1000 t d , t d,pwr-on [ms] c d [nf] t j = 25 c t d,pwr-on (typ.) t d (typ.)
data sheet 22 rev. 1.0, 2014-03-03 tle4678-2 watchdog function 8 watchdog function 8.1 description the tle4678-2 features a load dependent watchdog func tion with a programmable activating threshold as well as a programmable watchdog timing. the watchdog function monitors a microcontroller, including time base failures. in case of a missing rising edge within a certain pulse repetition time, the watchdog out put is set to ?low?. the programming of the expected watchdog pulse repetition time can be easily done by an external reset delay capacitor. the watchdog output ?wo? is separated from the reset ou tput ?ro?. hence, the watc hdog output might be used as an interrupt signal for the microcontroller independent from the reset signal. it is possible to interconnect pin ?wo? and pin ?ro? in order to establish a wire-or function with a dominant low signal. programmable watchdog activati on threshold and hysteresis in case a microcontroller is set to sleep mode or to low power mode, its current consumption is very low and the controller might not be able to send any watchdog pulses to the regulators watchdog input ?wi?. in order to avoid unwanted wake-up signals due to missing edges at pin ?wi?, the tle4678-2 watchdog function can be activated dependent on the regulator?s output current. the tle467 8-2 comprises a default watchdog activating threshold i q,wdact,th with a small hysteresis i q,wdact,hy which is modifiable by an external resistor r wadj,ext connected to the pin ?wadj?. for using the default watchdog activating threshold, leave pin ?wadj? open. the following tabel shows the external resisistor r wadj,ext that is needed at pin ?wadj? for activating/deactivating the watchdog at a desired output current i q,wdact,th , i q,wddeact,th . table 7 r wadj,ext [kohm)] i q,wdact,th [ma] i q,wddeact,th [ma] i q,wdact,hy [a] 4000 1.015 0.987 28 470 1.339 1.310 29 220 1.761 1.700 61 100 2.728 2.612 116 50 4.435 4.217 219 33 6.333 6.016 318 20 9.792 9.310 482 10 18.523 17.838 685 7.5 24.198 23.472 725
tle4678-2 watchdog function data sheet 23 rev. 1.0, 2014-03-03 figure 8 block diagram watchdog circuit watchdog output ?wo? the watchdog output ?wo? is an open co llector output with an integrated pull-up resistor. in case a lower-ohmic ?wo? signal is desired, an external pull-up resistor to the output ?q? can be connected. since the maximum ?wo? sink current is limited, the optional external resistor r wo,ext needs to be sized to comply with the watchdog output sink current (see table ?watchdog output low voltage? on page 25 and table ?watchdog output maximum sink current? on page 25 ). watchdog input ?wi? the watchdog is triggered by an positive edge at the wa tchdog input ?wi?. the signal is filtered by a bandpass filter and therefore its amplitude and sl ope has to comply wit h the specification table ?watchdog input? on page 25 to table ?watchdog input sign al slew rate? on page 25 . for details on the test pulse applied, see figure 9 . gnd q i b lockdiagram _w atchdoga djust .vsd supply wo v dw int. supply i d, ch i dw ,dsch v dw , hi control d c d reset optional c q vdd micro- controller gnd & r wadj ,ext (optional) edge detect wadj wi v wadj,th i/o wi r wo s r 1 r wadj ,int or i wo i wadj i q
data sheet 24 rev. 1.0, 2014-03-03 tle4678-2 watchdog function figure 9 test pulses watchdog input wi watchdog timing positive edges at the watchdog input pin ?wi? ar e expected within the watchdog trigger time frame t wi,tr , otherwise a low signal at pin ?wo? is generate d. if a watchdog low signal at pin ?wo? is generated, it remains low for t wd,lo . all watchdog timings are defined by charging and discharging the capacitor c d at pin ?d?. thus, the watchdog timing can be programmed by selecting c d . for timing details see also figure 10 . in case a watchdog trigger time period t wi,tr different from the value for c d = 100nf is required, the delay capacitor?s value can be derived from the specified value given in table ?watchdog trigger time? on page 26 : c d = 100nf t wi,tr / t wi,tr,100nf (5) the watchdog output low time t wd,lo and the watchdog period t wd,p then becomes: t wd,lo = t wd,lo,100nf c d / 100nf (6) t wd,p = t wi,tr + t wd,lo (7) the formula is valid for c d 10nf. for precise timing calculations cons ider also the delay capacitor?s tolerance. figure 10 timing diagram watchdog v wi t v wi,lo v wi,hi t wi,p d v wi / d t v wi v wi,lo v wi,hi 1/ f wi t v wi t v wi,lo v wi,hi v wo timingdiagram_watchdog.vsd t v wo,low t wd,lo t w i,tr v dw,lo v dw,hi t v d t wd,lo t w i,p t wi,p 1/ f wi no positive v wi edge d v wi / d t outside spec
tle4678-2 watchdog function data sheet 25 rev. 1.0, 2014-03-03 8.2 electrical character istics watchdog function table 8 electrical characteristics: watchdog function v i = 13.5 v, t j = -40c to +150 c, all voltages with respect to ground, di rection of currents as shown in table 8 (unless otherwise specified). parameter symbol values unit note / test condition number min. typ. max. default watchdog activating threshold (pin wadj left open) watchdog activating threshold i q,wdact,th 0.65 1.1 1.65 ma i q increasing p_8.2.1 watchdog deactivating threshold i q,wddeact,t h 0.55 0.9 ? ma i q decreasing p_8.2.2 watchdog activating threshold hysteresis i q,wdact,hy ? 26 ? a ? p_8.2.3 adjustable watchdog activating threshold (external resistor connected to pin wadj) watchdog activating threshold i q,wdact,th ?1.76?ma i q increasing r wadj,ext = 220 k ? 1) 2) p_8.2.4 watchdog deactivating threshold i q,wddeact,t h ?1.70?ma i q decreasing r wadj,ext = 220 k ? 1) 2) p_8.2.5 watchdog activating threshold hysteresis i q,wdact,hy ?60?a r wadj,ext = 220 k ? 1) 2) p_8.2.6 watchdog input wi watchdog input low signal valid v wi,lo ? ? 0.8 v ? 3) p_8.2.7 watchdog input high signal valid v wi,hi 2.6??v? 3) p_8.2.8 watchdog input high signal pulse length t wi,p 0.5??s v wi v wi,high 3) p_8.2.9 watchdog input signal slew rate d v wi /d t 1??v/s v wi,low v wi v wi,high 3) p_8.2.10 watchdog input signal frequency capture range f wi ??1mhzsquare wave, 50% duty cycle 3) p_8.2.11 watchdog output wo watchdog output low voltage v wo,low ?0.20.4v i wo = 1 ma; watchdog active; v wi = 0 v p_8.2.12 watchdog output maximum sink current i wo,max 1.5 13 30 ma v wo = 0.8 v; watchdog active; v wi = 0 v p_8.2.13 watchdog output internal pull-up resistor r wo 20 30 45 k ? ? p_8.2.14 watchdog timing delay capacitor charge current i d ?2.78?a v d = 1 v p_8.2.15 delay capacitor watchdog discharge current i dw,disch ?1.39?a v d = 1 v p_8.2.16
data sheet 26 rev. 1.0, 2014-03-03 tle4678-2 watchdog function upper watchdog timing threshold v dw,hi ? 1.2 ? v ? p_8.2.17 lower watchdog timing threshold v dw,lo ? 0.7 ? v ? p_8.2.18 watchdog trigger time t wi,tr,100nf 24 36 54 ms calculated value; c d = 100 nf 4) p_8.2.19 watchdog output low time t wd,lo,100nf 12 18 27 ms calculated value; c d = 100 nf 4) v q > v rt,lo p_8.2.20 watchdog period t wd,p,100nf 36 54 81 ms calculated value; t wi,tr,100nf + t wd,lo,100nf c d = 100 nf 4) p_8.2.21 1) for details see table 7. 2) not subject to production test, specified by design. 3) for details on the test pulse applied, see figure 9 . 4) for programming a different watchdog timing, see chapter 8.1 .. table 8 electrical characteristics: watchdog function (cont?d) v i = 13.5 v, t j = -40c to +150 c, all voltages with respect to ground, di rection of currents as shown in table 8 (unless otherwise specified). parameter symbol values unit note / test condition number min. typ. max.
tle4678-2 watchdog function data sheet 27 rev. 1.0, 2014-03-03 8.3 typical performance characte ristics standard watchdog function watchdog activating threshold i q,wdact,th versus external resistor r wadj,ext watchdog deactivating threshold i q,wddeact,th versus external resistor r wadj,ext watchdog trigger time t wi,tr versus delay capacitor c d watchdod activation threshold hysteresis i q,wdact,hy versus external resistor r wadj,ext 0 2 4 6 8 10 12 14 16 18 20 22 24 1 10 100 1000 10000 i q,wdact,th [ma] r wadj ,ext [k ? ] t j = 25 c 0 2 4 6 8 10 12 14 16 18 20 22 24 1 10 100 1000 10000 i q,wddeact,th [ma] r wadj ,ext [k ? ] t j = 25 c 1 10 100 1000 10 100 1000 t wi,tr [ms] c d [nf] t j = 25 c 0 100 200 300 400 500 600 700 800 1 10 100 1000 10000 i q,wdact,hy [a] r wadj ,ext [k ? ] t j = 25 c
data sheet 28 rev. 1.0, 2014-03-03 tle4678-2 application information 9 application information note: the following information is given as a hint for the implementation of the device only and shall not be regarded as a description or warranty of a certain functionality, condition or quality of the device. 9.1 application diagram figure 11 application diagram 9.2 selection of external components 9.2.1 input pin the typical input circuitry for a linear voltage regulator is shown in the application diagram above. a ceramic capacitor at the input, in the range of 100nf to 470nf, is recommended to filter out the high frequency disturbances imposed by the line e.g. iso pulses 3a/b. this capacitor must be placed very close to the input pin of the linear voltage regulator on the pcb. an aluminum electrolytic capacitor in the range of 10 f to 470f is recommended as an input buffer to smooth out high energy pulses, such as iso pulse 2a. this capaci tor should be placed close to the input pin of the linear voltage regulator on the pcb. an overvoltage suppressor diode can be used to furthe r suppress any high voltag e beyond the maximum rating of the linear voltage regulator and protect the devic e against any damage due to over-voltage above 45 v. the external components at the input are not mandatory for the operation of the voltage regulator, but they are recommended in case of possible external disturbances. 9.2.2 output pin an output capacitor is mandatory for th e stability of linear voltage regulators. the requirement to the output capacitor is given in ?functional range? on page 8 . the graph ?output capacitor series resistor esrcq versus output current iq? on page 12 shows the stable operation range of the device. tle4678-2 is designed to be stable with extremel y low esr capacitors. acco rding to the automotive requirements, ceramic capacitors with x5r or x7r dielectrics are recommended. the output capacitor should be placed as close as possible to the regulat or?s output and gnd pins and on the same side of the pcb as the regulator itself. reset and watchdog generator bandgap reference protection circuits gnd d wadj radj wi q wo ro c q c d load (e. g. micro controller) gnd i regulated output voltage appldiagr am.vsd tle4678-2 supply 100 nf 10 f c i1 c i2 <45v d i 10f (esr<3 ? ) 100nf
tle4678-2 application information data sheet 29 rev. 1.0, 2014-03-03 in case of rapid transients of input voltage or load curr ent, the capacitance should be dimensioned in accordance and verified in the re al application that t he output stability requ irements are fulfilled. 9.3 thermal considerations knowing the input voltage, the output voltage and the load profile of the application, the total power dissipation can be calculated: p d =( v i - v q ) i q + v i i q (8) with ? p d : continuous power dissipation ? v i : input voltage ? v q : output voltage ? i q : output current ? i q : quiescent current the maximum acceptable thermal resistance r thja can then be calculated: r thja,max =( t j,max - t a )/ p d (9) with ? t j,max : maximum allowed junction temperature ? t a : ambient temperature based on the above calculation the proper pcb type and the necessary heat sink area can be determined with reference to the specification in ?thermal resistance? on page 8 . example application conditions: v i = 13.5v v q = 5v i q = 50ma t a = 85c calculation of r thja,max : p d =( v i ? v q ) i q + v i i q = (13.5v ? 5v) 50ma + 13.5v 1.6ma = 0.425w + 0.022w =0.447w r thja,max =( t j,max ? t a )/ p d = (150c ? 85c) / 0.447w = 145.41k/w as a result, the pcb design must ensure a thermal resistance r thja lower than 145.41 k/w. according to ?thermal resistance? on page 8 , at least 300 mm 2 heatsink area is needed on the fr 4 1s0p pcb, or the fr4 2s2p board can be used.
data sheet 30 rev. 1.0, 2014-03-03 tle4678-2 application information 9.4 reverse polarity protection tle4678-2 is self protected against reverse polarity faults and allows negative supply voltage. external reverse polarity diode is not needed. however, the absolute maximum ratings of the device as specified in ?absolute maximum ratings? on page 7 must be kept. the reverse voltage causes several sma ll currents to flow into the ic henc e increasing its junction temperature. as the thermal shut down circuitry does not work in the re verse polarity condition, designers have to consider this in their thermal design. 9.5 further application information ? for further information you may contact http://www.infineon.com/
tle4678-2 package outlines data sheet 31 rev. 1.0, 2014-03-03 10 package outlines figure 12 pg-tson10 green product (rohs compliant) to meet the world-wide customer requirements for environmentally friendly products and to be compliant with government regulations the device is available as a green product. green products are rohs-compliant (i.e pb-free finish on leads and suitable for pb-free soldering according to ipc/jedec j-std-020). pin 1 marking pin 1 marking 0.1 0.2 0.1 0.25 0.1 0.55 0.96 0.1 2.58 0.1 0 +0.05 0.1 0.1 0.36 0.1 0.53 0.1 0.1 0.25 0.5 0.1 3.3 0.1 3.3 0.1 1 0.1 0.71 0.1 1.63 0.1 1.48 0.1 z 0.05 0.07 min. z (4:1)
data sheet 32 rev. 1.0, 2014-03-03 tle4678-2 revision history 11 revision history revision date changes 1.0 2014-03-03 initial version
edition 2014-03-03 published by infineon technologies ag 81726 munich, germany ? 2014 infineon technologies ag all rights reserved. legal disclaimer the information given in this docu ment shall in no event be regarded as a guarantee of conditions or characteristics. with respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, infine on technologies hereby disclaims any and all warranties and liabilities of any kind, including witho ut limitation, warranties of non-infrin gement of intellectua l property rights of any third party. information for further information on technology, delivery terms and conditions and prices, please contact the nearest infineon technologies office ( www.infineon.com ). warnings due to technical requirements, components may contain dangerous substances. for information on the types in question, please contact the nearest infineon technologies office. infineon technologies compon ents may be used in life-su pport devices or systems only with the express written approval of infineon technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system or to affect the safe ty or effectiveness of that de vice or system. life support devices or systems are intended to be implanted in the hu man body or to support an d/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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