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type package tle 4278 g pg-dso-14-30 (rohs compliant) 5-v low drop fixed voltage regulator tle 4278 g p-dso-14-3, -8, -9, -11, 14 pg-dso-14-30 data sheet 1 rev. 1.4, 2007-02-19 features ? output voltage tolerance 2% ? very low current consumption ? separated reset and watchdog output ? low-drop voltage ? watchdog ? adjustable watchdog ac tivating threshold ? adjustable reset threshold ? overtemperature protection ? reverse polarity protection ? short-circuit proof ? suitable for use in automotive electronics ? wide temperature range ? aec qualified ? green product (rohs compli ant) version of tle 4278 g functional description the tle 4278 is a monolithic integrated low-drop fixed output voltage regulator supplying loads up to 200 ma. the ic is available in a pg-dso-14-30 package. it is designed to supply mi croprocessor systems unde r the severe condit ions of automotive applications and therefore e quipped with addi tional protection func tions against over- load, short circuit and overtemperature. the tle 4278 can also be used in other applications where a stab ilized voltage is required. an input voltage v i in the range of 5.5 v v i 45 v is regulated to v q,nom = 5 v with an accuracy of 2%. the device operates in the wide temperature range of t j = -40 to 150 c. two additional features are implemented in the tle 427 8 a load dependent watchdog function as well as a sophisticated reset func tion including power on reset, under voltage reset, adjustable reset dela y time and adjustable re set switching threshold.
data sheet 2 rev. 1.4, 2007-02-19 tle 4278 g the watchdog function monitors the microcontrol ler, including time ba se failures. in case of a missing rising edge within a certain puls e repetition time the watchdog output is set to low. programming of the ma x. repetition time c an be done easily by an external reset delay capacitor. to prevent a reset in case of missing pu lses, the watchdog output wo is separate from the reset output ro fo r the tle 4278. the wa tchdog output can be used as an interrupt si gnal for the microcontrolle r. in any case it is possible to connect pin wo and pin ro externally. when the controller is set to sleep mode or low power m ode its current consumption drops and no watchdog pulses are created . in order to avoid unnecessary wake-up signals due to missing pulses at pin wi the watchdog fe ature can be disabled as a function of the load cu rrent. the switch off threshold is se t by an external resistor to pin wadj. the watchdog function can also be used as a time r, which periodically wakes up the controller. therefore the pin wadj has to be connecte d to the output q. the power on reset feature is necessary for a defined star t of the microprocessor when switching on the application. th e reset signal at pin ro goes high after a certain delay timed t rd when the output volt age of the regulator has surpa ssed the reset th reshold. the delay time is set by the ex ternal delay capaci tor. an under volt age reset circuit supervises the output voltage. in case v q falls below the reset th reshold the reset output is set to low after a s hort reset reaction time t rr . the reset low signal is generated down to an output voltage v q of 1 v. in addition the re set switching th reshold can be adjusted by an external volt age divider. this feature is useful with microprocessors which guarantee a safe operation down to voltages below the in ternally set reset threshold of 4.65 v typical.
tle 4278 g data sheet 3 rev. 1.4, 2007-02-19 figure 1 pin configuration (top view) table 1 pin definitions and functions pin symbol function 1wo watchdog output; the open collector output is connected to the 5 v output via an integrated resistor of 30 k ? . 2wadj watchdog adjust; an external resistor to gnd determines the watchdog activating threshold. 3, 4, 5, 10, 11, 12 gnd ground 6d reset delay; connect a capacitor to ground for delay time adjustment. 7radj reset switching threshold adjust; for setting the switching threshold, connect a voltage divide r from output to ground. if this input is connected to ground, the re set is triggered at the internal threshold. 8wi watchdog input; rising edge-triggered input for monitoring a microcontroller. 9q 5 v output voltage; block to ground with min. 10 f capacitor, esr 5 ? . 13 i input voltage; block to ground directly on the ic with ceramic capacitor. 14 ro reset output; the open collector output is connected to the 5 v output via an integrated resistor of 30 k ? . ro gnd radj d gnd 8 w 12 11 gnd gnd 1 2 3 4 5 gnd 6 7 14 13 wo wadj 9 10 aep02113 gnd v v q pg-dso-14-30
data sheet 4 rev. 1.4, 2007-02-19 tle 4278 g figure 2 block diagram aeb02114 temperature sensor - + control amplifier protection circuit reference bandgap generator reset watchdog w 14 9 7 6 v ro d radj 13 3-5, 10-12 gnd 8 2 wadj 1 wo v q
tle 4278 g data sheet 5 rev. 1.4, 2007-02-19 table 2 absolute maximum ratings t j = -40 to 150 c parameter symbol limit values unit notes min. max. input voltage i voltage v i -42 45 v ? current i i ? ? ma internally limited output voltage q voltage v q -1 25 v ? current i q ? ? ma internally limited reset output ro voltage v ro -0.3 25 v ? current i ro -5 5 ma ? reset delay d voltage v d -0.3 7 v ? current i d -2 2 ma ? reset switching thre shold adjust radj voltage v radj -0.3 7 v ? current i radj ? ? ma internally limited watchdog input wi voltage v wi -0.3 7 v ? current i wi ? ? ma internally limited watchdog output wo voltage v wo -0.3 25 v ? current i wo -5 5 ma ? watchdog adjust wadj voltage v wadj -0.3 7 v ? current i wadj ? ? ma internally limited ground gnd current i gnd -100 50 ma ?
data sheet 6 rev. 1.4, 2007-02-19 tle 4278 g note: esd protection acco rding to mil std. 883: 2 kv. maximum ratings are absolute ratings; exceeding any one of these values may cause irreversible damage to the integrated circuit. note: in the operating range th e functions given in the circ uit description are fulfilled. temperatures junction temperature t j -50 150 c? storage temperature t stg -50 150 c? table 3 operating range parameter symbol limit values unit notes min. max. input voltage v i 5.5 45 v ? junction temperature t j -40 150 c? thermal resistance junction ambient r thj-a ?80k/w 1) 1) package mounted on pcb 80 80 1.5 mm 3 ; 35 cu; 5 sn; heat sink area 6 cm 2 ; zero airflow. junction pin r thj-pin ? 30 k/w measured to pin 4 table 2 absolute maximum ratings (cont?d) t j = -40 to 150 c parameter symbol limit values unit notes min. max.
tle 4278 g data sheet 7 rev. 1.4, 2007-02-19 table 4 electrical characteristics v i = 13.5 v; -40 c t j 125 c (unless otherwise specified) parameter symbol limit va lues unit test condition min. typ. max. output voltage v q 4.90 5.00 5.10 v 0 ma i q 150 ma; 6 v v i 28 v output voltage v q 4.8 5.0 5.2 v 1 ma i q 50 ma; 28 v v i 45 v output current limiting i q 200 400 ? ma v q = 4.8 v current consumption i q = i i - i q i q,o ? 180 200 a t j = 25 c; i q = 0 ma current consumption i q = i i - i q i q,o ? 210 230 a i q = 0 ma; t j = 85 c current consumption i q = i i - i q i q,150 ?512ma i q = 150 ma drop voltage v dr = v i - v q v dr ?0.250.5v i q = 150 ma 1) load regulation ? v q.lo -30 -5 ? mv i q = 5 to 150 ma; v i = 6 v line regulation ? v q,li ?520mv v i = 6 to 28 v i q = 5 ma reset generator reset threshold v q,rt 4.5 4.65 4.8 v radj connected to gnd reset headroom ? v q,rt = ( v q,nom - v q,rt ) 180 350 ? mv i q = 10 ma reset adjust threshold v radj,th 1.28 1.35 1.45 v v q 3.5 v reset low voltage v ro,l ?0.200.40v r ext = 10 k ? to v q v q 1 v reset high voltage v ro,h 4.5??v? reset pull-up r ro 20 30 45 k ? internal connected to v q charging current i d,c 258 a v d = 1.0 v
data sheet 8 rev. 1.4, 2007-02-19 tle 4278 g upper timing threshold v du 1.5 1.9 2.3 v ? lower reset timing threshold v drl 0.2 0.3 0.4 v ? delay time t rd 12 20 28 ms c d = 47 nf reset reaction time t rr 0.4 1.0 2.0 s c d = 47 nf watchdog activating threshold v wadj,th 1.28 1.35 1.45 v voltage at wadj current ratio i q / i wadj 650 720 800 ? i q 10 ma slew rate d v wi /d t 5??v/ s from 20% up to 80% v q watchdog low voltage v wol ?0.20.4v r ext > 10 k ? to v q watchdog high voltage v woh 4.5??v? watchdog pull-up r wo 20 30 45 k ? internal connected to v q charge current i d,wc 258 a v d = 1.0 v discharge current i d,wd 0.6 1.3 2.0 a v d = 1.0 v upper timing threshold v du 1.5 1.9 2.3 v ? lower watchdog timing threshold v dwl 0.5 0.7 0.9 v ? watchdog output pulse period t wd,p 42 60 80 ms c d = 47 nf watchdog output low time t wd,l 71319ms v q > v rt watchdog trigger time t wi,tr 35 47 61 ms c d = 47 nf 1) measured when the output voltage v q has dropped 100 mv from the nominal value. table 4 electrical characteristics (cont?d) v i = 13.5 v; -40 c t j 125 c (unless otherwise specified) parameter symbol limit va lues unit test condition min. typ. max.
tle 4278 g data sheet 9 rev. 1.4, 2007-02-19 figure 3 test circuit aes02115 tle 4278 1000 f nf v ro q v gnd q c d 47 nf v d ro o v - v v dr = 470 re v v w v outside the control range v ro g wadj wo v wadj wo v radj gnd 13 9 67 10-12 3-5, d 1 2 814 wo wadj q v w c 12 cc q 10 f
data sheet 10 rev. 1.4, 2007-02-19 tle 4278 g application information input, output the input capacitors c i1 and c i2 are necessary for compensa ting line influences. using a resistor of approx. 1 ? in series with c i1 , the lc circuit of in put inductance and input capacitance can be damped. to stabilize the regulation circuit the output capacitor c q is necessary. stability is guaranteed at values c q 10 f with an esr 5 ? within the operating temperature range. figure 4 application circuit aes02116 tle 4278g c d 47 nf 22 f or short to gnd radj wadj gnd 13 9 62 10-12 3-5, d 7 +12 v cooling area 8 w 14 ro wadj r r 2 1 r *) *) q c for internal threshold p 1 wo v v q 470 nf c 1 c 2
tle 4278 g data sheet 11 rev. 1.4, 2007-02-19 reset timing the power-on reset delay time is defined by the char ging time of an external capacitor c d which can be calculated as follows: c d = ( ? t rd i d,c )/ ? v (1) definitions: ? c d = delay capacitor ? ? t rd = delay time ? i d,c = charge current, typical 5 a ? ? v = v du , typical 1.9 v ? v du = upper delay swit ching threshold at c d for reset delay time the reset reaction time t rr is the time it take s the voltage regulato r to set the reset out low after the output vo ltage has dropped belo w the reset threshold. it is typically 1 s for delay capacitor of 47 nf. for other values for c d the reaction time can be estimated using equation (2) : t rr 20 s/f c d (2) figure 5 reset timing (watchdog disabled) aed03010 thermal t rd power-on-reset voltage dip secondary overload at output spike v d,c = v d dt v q q, rt v t rr < rr t at input undervoltage shutdown c d t v ro d v t t t v du v drl
data sheet 12 rev. 1.4, 2007-02-19 tle 4278 g reset switching threshold the present default value is 4.65 v. when using the tle 4 278 the reset threshold can be set to 3.5 v < v q,rt < 4.6 v by connecting an external voltage divider to pin radj. the calculation can be easily done since the reset adju st input current can be neglected. if this feature is not needed, the pin has to be connected to gnd. v q,rt = v ref (1 + r 1 / r 2 )(3) definitions: ? v q,rt = reset threshold ? v ref = comparator reference voltage, typical 1.35 v (reset adjust input current 50 na) figure 6 the reset output pin is internally co nnected to the 5 v output q via a 30 k ? pull-up resistor. down to an output voltage v q of typical 1 v the reset low signal at pin ro is generated. for the timing of the reset feature please refer to figure 5 . aes03071 band-gap- reference ro radj gnd q reference band-gap- > 1 + - 1.35 v 1.35 v 30 k ? r 1 2 r tle 4278 g 13 9 14 7 3 ... 5, 10 ... 12
tle 4278 g data sheet 13 rev. 1.4, 2007-02-19 watchdog activating the calculation of the external resistor which adjusts the watchdog switch off threshold can be done by equation (4) : r wadj = v wadj,th ( i q / i wadj )/ i q,act (4) definitions: ? v wadj,th = switch off thresh old, typical 1.35 v ? i q / i wadj = current ratio, typical 720 ? i q,act = switch off load current figure 7 aes03072 band-gap- reference gnd + - tle 4278 g watchdog active high disabled watchdog low wadj r wadj q
data sheet 14 rev. 1.4, 2007-02-19 tle 4278 g watchdog timing the frequency of the watc hdog pulses has to be higher than th e minimum pulse sequence which is set by the ex ternal reset delay capacitor c d . calculation can be done according to the formulas given in figure 8 . the watchdog output is internally co nnected to the output q via a 30 k ? pull-up resistor. to generate a watchdog created reset signal for the microcontroller the pin wo can be connected to the reset input of the microcontroller. it is al so allowed to parallel the watchdog out to the reset out. figure 8 timing of the watchdog function aed03099 w v v v q d v v wo v du - v dwl () ( d, wc + d, wd ) d, wc x d, wd t wd, p = wd, l t wd, p t wi, tr t wd, l t = v v ( du - dwl ) d, wc t = v v ( du - dwl ) d, wd du v v dwl wi, tr c d ; ; d c d c t t t t t
tle 4278 g data sheet 15 rev. 1.4, 2007-02-19 table 5 hints for unused pins symbol function connect to ro reset output open d reset delay open or to output q radj reset switching threshold adjust gnd wi watchdog input gnd wo watchdog output open wadj watchdog adjust 1) to output q via a 270 k ? resistor: watchdog always active 2) to gnd: watchdog disabled
data sheet 16 rev. 1.4, 2007-02-19 tle 4278 g drop voltage v dr versus output current i q current consumption i q versus input voltage v i current consumption i q versus output current i q output voltage v q versus input voltage v i aed01544 0 0 = 125 v dr t mv c 100 200 300 400 500 600 700 q 50 100 150 200 ma c t 25 = 250 j j aed01546 0 0 = 33 ? r i q 2 4 6 8 10 12 10 20 30 40 50 l l r ? = 50 l r ? = 100 t j = 25 ?c ma v i v 0.1 i q [ma] 110 tle4278_iq -iq .vsd 1 0.1 0.01 10 100 i q [ma] v i = 13.5v t j = 25c aed01547 0 0 v q v 2 4 6 8 10 ma 24 6 8 v l r ? 33 =
data sheet 17 rev. 1.4, 2007-02-19 tle 4278 g charge current i d,wc and discharge current i d,wd versus temperature t j output voltage v q versus temperature t j switching voltage v du , v dwl and v drl versus temperature t j output current limit i q versus input voltage v i 3 2 1 0 -40 0 40 7 6 5 4 8 = 1.0 v v d, wd d, wc d 13.5 v v = j 120 80 t c aed03111 a aed03056 -40 4.6 v q 4.7 4.8 4.9 5.0 5.1 5.2 040 80 120 160 13.5 v v = t j v ?c aed03055 -40 0 = 13.5 v v d t 3.2 040 80 120 ?c v 0.4 0.8 1.2 1.6 2.0 2.4 2.8 du v dwl v v drl j v 160 aed03057 0 0 i q 10 20 30 40 50 t j = 25 ?c v 100 200 300 400 500 ma i v
data sheet 18 rev. 1.4, 2007-02-19 tle 4278 g package outlines figure 9 pg-dso-14-30 (plastic dual small ou tline) (rohs compliant) green product to meet the world-wi de customer requirements for envi ronmentally friendly products and to be compliant with government regula tions the device is available as a green product. green products are ro hs-compliant (i.e pb-free fi nish on leads and suitable for pb-free soldering according to ipc/jedec j-std-020). ?.08 ?.2 does not include plastic or metal protrusion of 0.15 max. per side index marking -0.06 1.27 +0.1 0 .41 c 0.1 -0.2 8.75 1 14 7 1) a m 0.2 8 a 0.1 min. (1.5) c 14x 6 1.75 max. 4 1) -0.2 0.33 ?.25 0.64 0.2 +0.05 -0.01 x 45? max. 8? 1) gps09033
tle 4278 g data sheet 19 rev. 1.4, 2007-02-19 tle 4278 g revision history: 2007-02-19 rev. 1.4 previous version: 1.3 page subjects (major cha nges since last revision) general updated infineon logo #1 added ?aec? and ?green? logo #1 added ?green product? and ?aec qualified? to the feature list #1 updated package name s to ?pg-dso-14-30? #18 added ?green product? remark you can find all of our packages, sorts of packing and others in our infineon internet page ?products?: http://www.infineon.com/products . dimensions in mm smd = surface mounted device
edition 2007-02-19 published by infineon technologies ag, 81726 mnchen, germany ? infineon technologies ag 2007. all rights reserved. attention please! the information herein is given to describe certain comp onents and shall not be considered as a guarantee of characteristics. terms of delivery and rights to technical change reserved. we hereby disclaim any and all warrant ies, including but not limited to warran ties of non-infringement, regarding circuits, descriptions and charts stated herein. information for further information on technology, delivery terms an d conditions and prices please contact your 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 your nearest infineon technologies office. infineon technologies components may only be used in life-support devices or system s 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 safety 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 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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