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for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maximintegrated.com. max6765?ax6774 automotive micropower linear regulators with supervisor evaluation kit available general description the max6765?ax6774b are low-quiescent-current,high-voltage linear regulators that operate from 4v to 72v and deliver up to 100ma of load current. these low- power devices consume only 31? of quiescent current, making them ideal for always-on automotive modules. these devices are offered with fixed standard output options of 5.0v, 3.3v, 2.5v, and 1.8v, or can be adjusted from 1.8v to 11v with two external resistors. the max6765?ax6774b feature a push-pull or open- drain, active-low reset output with either fixed or adjustable thresholds. whenever the regulator? outputfalls below the reset threshold, the reset output asserts and remains asserted for at least the minimum resettimeout period after the output voltage exceeds its threshold. the minimum reset timeout period is offered with fixed values from 75? to 200ms or can be adjusted externally with a small capacitor. these devices provide three regulator enable modes to accommodate several power-on schemes. the max6765/max6766/max6769/max6770/max6773/ max6773b/max6774/max6774b feature a single tradi- tional enable input (enable) to turn on and off the regula- tor. the max6771/max6772 provide dual enable inputs (enable1 and enable2) to turn on and off the regulator either through an ignition switch or a bus transceiver. the max6767/max6768 provide a hold input ( hold ) in addi- tion to the enable input to allow for the implementation of aself-holding circuit without requiring external components. setting hold low after enabling the regulator forces the regulator to remain on even if enable is subsequentlyset low. releasing hold shuts down the regulator. the max6773/max6773b/max6774/max6774b alsoinclude a watchdog input that monitors a pulse train from the microprocessor (?) and generates a reset pulse if the watchdog input remains high or low for a duration longer than the 1.6s (typ) (max6773/max6774) or 50ms (typ) (max6773b/max6774b) watchdog timeout period. the max6765?ax6774b are available in a small, ther- mally enhanced 3mm x 3mm tdfn package that can dissipate up to 1.951w, thereby supporting continuous regulator operation during high ambient temperatures, high battery voltage, and high load-current conditions. the max6765?ax6774b are fully specified for a -40? to +125? operating temperature range. applications automotiveindustrial telecom features ? low 31 a quiescent current ? 4v to 72v wide input voltage range ? 100ma output current capability ? dropout voltage of 620mv with 5v outputat 100ma ? fixed output-voltage options: 5v, 3.3v, 2.5v, and 1.8v ? watchdog timer option (1.6s (max6773/max6774) and 50ms (max6773b/max6774b)) ? adjustable output voltages from 1.8v to 11v ? open-drain or push-pull reset output ? fixed or capacitor-adjustable reset timeouts ? small, thermally enhanced 1.9w, 3mm x 3mmtdfn package ? overtemperature and short-circuit protection ? fully specified from -40? to +125? 1 + 23 ep 654 enable gnd in reset timeout out max6765 max6766 tdfn top view part temp range pin- package max6765 tt_d_+ -40? to +125? 6 tdfn-ep* max6765 tt_d_/v+ -40? to +125? 6 tdfn-ep* pin configurations ordering information 19-0657; rev 8; 4/13 ordering information continued at end of data sheet. typical application circuit and selector guide appear at end of data sheet. pin configurations continued at end of data sheet. the first ??is a placeholder for the voltage output and reset threshold. the 2nd ??designates the fixed reset-timeout option. see tables 1 and 2 for details. for example, the max6765ttld4 has a 5v output, a reset threshold of 4.65v, and a 200ms typical reset timeout. + denotes a lead(pb)-free/rohs-compliant package. /v denotes an automotive qualified part. * ep = exposed pad. for tape-and-reel orders add a ??after the ??symbol to com- plete the part number. tape-and-reel orders are available in 2.5k increments. nonstandard versions require a 10k minimum order quantity. downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 2 maxim integrated absolute maximum ratings electrical characteristics (v in = 14v, c in = 0.1?, c out = 10?, t a = t j = -40? to +125?, unless otherwise noted. typical values are at t a = t j = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (all pins referenced to gnd, unless otherwise noted.)v in ..........................................................................-0.3v to +80v out ................................................-0.3v to min (12v, in + 0.3v) enable, enable1, enable2 .....................-0.3v to (in + 0.3v) reset (open-drain output), timeout, wdi, resetin, set ......................................................-0.3v to 12v reset (push-pull output), hold ..............-0.3v to (out + 0.3v) maximum current (all pins except in and out).................50ma continuous power dissipation (t a = +70?) 6-pin tdfn 3mm x 3mm (derate 23.8mw/? above +70?) ...........................1904.8mw 8-pin tdfn 3mm x 3mm (derate 24.4mw/? above +70?) ...........................1951.2mw operating temperature range .........................-40? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? parameter symbol conditions min typ max units supply voltage range v in 47 2 v i load = 0a 31 45 i load = 50ma 35 50 i load = 100ma, v in = 14v 37 55 i load = 0a, v in = 42v 35 50 supply current(max6765?ax6772) (note 2) i load = 10ma, v in = 42v 37 55 ? i load = 0a 38 50 i load = 50ma 42 55 i load = 100ma 44 60 i load = 0a, v in = 42v 42 55 supply current(max6773/max6773b/ max6774/max6774b) (note 2) i load = 10ma, v in = 42v 44 60 ? shutdown supply current i shdn enable , enable1, enable2 = gnd 3.3 7 a l/m, i load = 1ma 4.925 5 5.075 l/m, 1ma i load 100ma, v in = 11v 4.850 5 5.150 t/s, i load = 1ma 3.251 3.3 3.350 t/s, 1ma i load 100ma, v in = 9.3v 3.201 3.3 3.399 z/y, i load = 1ma 2.463 2.5 2.538 z/y, 1ma i load 100ma, v in = 8.5v 2.425 2.5 2.575 w/v, i load = 1ma 1.773 1.8 1.827 output voltage v out w/v, 1ma i load 100ma, v in = 7.8v 1.746 1.8 1.854 v adjustable output voltage range v out 1.8 11.0 v set threshold voltage(max6767?ax6774) v set i load = 1ma 1.20 1.233 1.26 v set rising 116 dual mode set threshold set falling 58 mv dual mode is a trademark of maxim integrated products, inc. downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 3 maxim integrated electrical characteristics (continued)(v in = 14v, c in = 0.1?, c out = 10?, t a = t j = -40? to +125?, unless otherwise noted. typical values are at t a = t j = +25?.) (note 1) parameter symbol conditions min typ max units set input current(max6767?ax6774) i set v set = 1.5v, v in = 11v -100 +100 na l/m, 5v output option, i load = 10ma 60 130 l/m, 5v output option, i load = 50ma 300 630 l/m, 5v output option, i load = 100ma 620 1200 dropout voltage (note 3) v do t/s, 3.3v output option, i load = 100ma 866 1600 mv guaranteed output current(note 4) 100 ma output current limit output shorted to gnd, v in = 14v 150 250 ma thermal-shutdown temperature 160 ? thermal-shutdown hysteresis 20 ? line regulation 6.5v v in 72v, i load = 1ma 1 % load regulation(max6767?ax6774) i out = 1ma to 100ma, v in = v out(nom) + 6v 1.5 % power-supply rejection ratio psrr i load = 10ma, f in = 100hz, 500mv p-p 70 db startup response time t start from enable high to out,i load = 100ma 180 ? output overvoltage protection threshold ov th i sink = 1ma (from out) 1.07 xv out 1.1 x v out 1.13 x v out v output overvoltage protection maximum sink current out = out (nom) x 1.15 5 10 ma logic input (enable, enable1, enable2, hold ) input low voltage v il enable, enable1, enable2 0.4 v input high voltage v ih enable, enable1, enable2 1.4 v enable, enable1, enable2input pulldown current enable, enable1, enable2 areinternally pulled down to gnd 0.6 ? v il 1.8v v out 11v 0.4 hold input threshold voltage v ih 1.8v v out 11v out - 0.4 v hold input pullup current hold is internally pulled up to out 1.8 ? reset output l 4.500 4.625 4.750 m 4.250 4.375 4.500 t 2.970 3.053 3.135 s 2.805 2.888 2.970 z 2.250 2.313 2.375 y 2.125 2.188 2.250 w 1.620 1.665 1.710 reset threshold set = gnd,reset falling v 1.530 1.575 1.620 v downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 4 maxim integrated electrical characteristics (continued)(v in = 14v, c in = 0.1?, c out = 10?, t a = t j = -40? to +125?, unless otherwise noted. typical values are at t a = t j = +25?.) (note 1) parameter symbol conditions min typ max units l/t/z/w, set = resistive divider, reset falling v out x 0.9 v out x 0.925 v out x 0.950 reset threshold (adjustable output voltage) m/s/y/v, set = resistive divider, reset falling v out x 0.85 v out x 0.875 v out x 0.900 v resetin input current v resetin = v gnd or 12v -100 +100 na v th = 87.5% of v set (m/s/y/v), reset falling 1.057 1.085 1.112 resetin threshold v th = 92.5% of v set (l/t/z/w), reset falling 1.118 1.147 1.176 v out to reset delay v out falling 0.3 ? resetin to reset delay resetin falling 35 ? d0 75 ? d1 2.187 3.125 4.063 d2 8.75 12.5 16.25 d3 35 50 65 reset timeout period (timeout connected to out) v out rising d4 140 200 260 ms timeout ramp current 800 1000 1200 na l/m/t/s options 1.160 1.220 1.259 timeout ramp threshold v/w/y/z options 1.060 1.170 1.242 v v out 1.8v, i sink = 50?, reset asserted 0.3 reset output-voltage low (open drain or push-pull) v ol v out 1.8v, i sink = 3.2ma, reset asserted 0.4 v reset output-voltage high (push-pull) v oh v out 1.8v, i source = 250?, reset not asserted 0.8 x v out v reset open-drain leakage current reset not asserted, reset = 12v 100 na watchdog minimum input pulse t wdi 1.8v v out 11v 1 ? watchdog input low voltage v il 1.8v v out 11v 0.4 v watchdog input high voltage v ih 1.8v v out 11v v out - 0.4v v watchdog input low voltage v il 1.8v v out 11v 0.4 v watchdog input current i wdi v wdi = 0v or v wdi = 12v -1 +1 ? max6773/max6774 1.12 1.6 2.08 s watchdog timeout period t wd max6773b/max6774b 40 50 60 ms note 1: production tested at t a = +25?. overtemperature limits are guaranteed by design. note 2: device tested at internally set voltage. note 3: dropout voltage for l/m versions is defined as (v in - v out ) when v out equals 98% of the nominal value of v out when v in = 11v. for t/s versions, dropout voltage is defined as (v in - v out ) when v out equals 98% of the nominal value of v out when v in = 9.3v. note 4: observe the absolute maximum power dissipation limits. downloaded from: http:///
24 2826 3230 3634 38 4240 44 42 0 2 8 12 36 44 52 60 68 supply current vs. input voltage max6765 toc01 input voltage (v) supply current ( a) i load = 100ma i load = 0 limited by powerdissipation v out = 3.3v 27 3129 3735 33 39 41 4543 47 -40 -10 5 -25 20 35 50 65 80 95 110 125 supply current vs. temperature max6765 toc02 temperature ( c) supply current ( a) i load = 100ma i load = 50ma i load = 1ma i load = 0 v out = 5v 1.0 1.5 4.52.5 2.0 3.0 3.5 4.0 5.0 -40 -10 5 20 -25 35 50 95 80 110 65 125 shutdown supply current vs. temperature max6765 toc03 temperature ( c) shutdown supply current ( a) 0 1.00.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 12 36 60 shutdown supply current vs. input voltage max6765 toc04 input voltage (v) supply current ( a) 42 84 4 5 2 20 68 0.992 1.0041.003 1.002 1.001 1.000 0.999 0.998 0.997 0.996 0.995 0.994 0.993 -40 -10 5 -25 20 35 50 65 80 95 110 125 normalized resetin threshold voltage vs. temperature max6765 toc05 temperature ( c) normalized resetin threshold voltage 20 0 100 50 150 200 250 300 350 400 450 500 550 600 40 60 80 100 dropout voltage vs. load current max6765 toc06 load current (ma) dropout voltage (mv) 03 0 10 50 70 90 v out = 5v 4.80 4.904.85 4.95 5.10 5.155.05 5.00 5.20 output voltage vs. load current max6765 toc07 output voltage (v) 20 40 60 80 100 load current (ma) 03 0 10 50 70 90 v out = 5v output voltage vs. load current max6765 toc08 3.223.20 3.24 3.30 3.323.28 3.26 3.34 output voltage (v) 20 40 60 80 100 load current (ma) 03 0 10 50 70 90 v out = 3.3v typical operating characteristics (v in = 14v, c out = 10?, c in = 0.1?, t a = +25?, unless otherwise noted.) max6765?ax6774 automotive micropower linear regulators with supervisor 5 maxim integrated downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 6 maxim integrated typical operating characteristics (continued) (v in = 14v, c out = 10?, c in = 0.1?, t a = +25?, unless otherwise noted.) output voltage vs. load current max6765 toc09 output voltage (v) 1.791.77 1.76 1.75 1.78 1.80 1.83 1.841.82 1.81 1.85 20 40 60 80 100 load current (ma) 03 0 10 50 70 90 v out = 1.8v 0 20 40 60 80 100 120 140 160 0 25 50 75 100 125 reset timeout period vs. capacitor value max6765 toc10 capacitor value (nf) reset timeout period (ms) 0.94 0.96 1.081.00 0.98 1.02 1.04 1.06 1.10 -40 -10 5 20 -25 35 50 95 80 110 65 125 normalized reset timeout period vs. temperature max6765 toc11 temperature ( c) normalized reset timeout period normalized watchdog timeout vs. temperature max6765 toc12 0.90 0.92 1.040.96 0.94 0.98 1.00 1.02 1.06 -40 -10 5 20 -25 35 50 95 80 110 65 125 temperature ( c) normalized watchdog timeout 0 1.00.5 2.01.5 2.5 3.0 3.5 4.0 01 0 1 5 5 2025303540 reset output vs. sink current max6765 toc13 sink current (ma) reset output (v) v out = 5v 0 0 1.00.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 481 21 6 max6765 toc14 source current (ma) reset output (v) 6 21 0 1 4 reset output vs. source current v out = 5v 34 35 36 37 38 39 40 41 42 0.001 0.01 0.1 1 10 100 supply current vs. watchdog input frequency max6765 toc15 watchdog input frequency (khz) supply current ( a) v out = 5v enable5v/div gate 5v/div hold 5v/div out 5v/div out and hold vs. enable max6765 toc16 20ms/div (see test circuit for enable and hold) downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 7 maxim integrated -180 -160 -140 -120 -100 -80 -60 -40 -20 0 20 40 power-supply rejection ratio vs. frequency frequency (hz) 0.1 1k 10k 100k 10 1 100 1m power-supply rejection ratio (db) max6765 toc17 0.9980 0.99900.9985 1.00000.9995 1.0005 1.0010 1.0015 1.0020 42 0 2 8 12 36 44 52 60 68 normalized out voltage vs. input voltage max6765 toc18 input voltage (v) normalized out voltage v out = 3.3v out(ac-coupled) 200mv/div i out 100ma/div load-transient response max6765 toc19 100ms/div v out = 5v out(ac-coupled) 1v/div v in 10v/div line-transient response max6765 toc20 400 s/div v out = 5v out(ac-coupled) 1v/div v in 20v/div line-transient response max6765 toc21 400 s/div v out = 5v 0 21 3 4 5 6 7 8 9 10 11 40 80 output capacitor series resistance vs. load current max6765 toc22 load current (ma) output capacitor series resistance ( ) 06 0 20 100 stable operating region typical operating characteristics (continued) (v in = 14v, c out = 10?, c in = 0.1?, t a = +25?, unless otherwise noted.) downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 8 maxim integrated pin description enable and hold test circuit pin max6765/max6766 max6767/max6768 max6769/max6770 max6771/max6772 max6773/ max6773b/ max6774/ max6774b name function 1111 1i n regulator input. bypass in to gnd with a capacitorwith a minimum value of 0.1?. 2 2 2 2 2 gnd ground 3 3 3 3 enable active-high enable input. drive enable high to turnon the regulator. enable is internally connected to gnd through a 0.6? current sink. 4555 5 reset active-low, open-drain/push-pull reset output.for the max6769/max6770, reset asserts when resetin is below the internal v th and deasserts when resetin is above the internal v th threshold. for all other versions, reset remains low while out is below the reset threshold. for all versions, reset remains low for the duration of the reset timeoutperiod after the reset conditions end. 5 7 7 7 7 timeout reset timeout adjust input. connect timeout toout for the internally fixed timeout period. for an adjustable timeout, connect a capacitor from timeout to gnd. see the selecting timeout capacitor section. 6 8 8 8 8 out regulator output. the max6765/max6766 providea fixed output (+1.8v, +2.5v, +3.3v, or +5v). the max6767?ax6774 provide a fixed output voltage of +1.8v, +2.5v, +3.3v, or 5v, or adjust the output from +1.8v to +11v. bypass to gnd with a 10? capacitor (min). gnd v in in enable n enable gate hold out out max6767 max6768 test circuit for out and hold vs. enable hold downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 9 maxim integrated pin description (continued) pin max6765/max6766 max6767/max6768 max6769/max6770 max6771/max6772 max6773/ max6773b/ max6774/ max6774b name function ? hold active-low regulator hold input. when hold is forced low, out remains on even if enable is pulledlow. to shut down the regulator, release hold after enable is pulled low. connect hold to out or leave unconnected if unused. hold is internally connected to out through a 1.8? current source. 6 6 6 6 set feedback input for setting the output voltage.connect set to gnd to select the preset output voltage. connect to an external resistive divider for adjustable output operation. 4 resetin adjustable reset threshold input. connect to aresistive divider to set the desired threshold. 3 enable1 active-high enable input 1. drive enable1 high toturn on the regulator. enable1 is internally connected to ground through a 0.6? current sink. 4 enable2 active-high enable input 2. drive enable2 high toturn on the regulator. enable2 is internally connected to ground through a 0.6? current sink. 4w d i watchdog timer input. if wdi remains high or low forlonger than the watchdog timeout period, the internal watchdog timer expires and the reset output asserts for the reset timeout period. the internal watchdog timer clears whenever a reset is asserted or wdi sees a rising or falling edge. the watchdog timer cannot be disabled. do not leave wdi unconnected. ? p exposed pad. ep is internally connected to gnd.connect ep to the ground plane to provide a low thermal-resistance path from the ic junction to the pcb. do not use as the electrical connection to gnd. detailed description the max6765?ax6774b low-quiescent-current, high-voltage linear regulators operate from a 4v to 72v input voltage and deliver more than 100ma of load current. the max6765?ax6774b include an integrated ? reset circuit that monitors the regulator output voltage and asserts a reset output when out falls below a threshold limit, and includes an internally fixed or adjustable reset timeout using a capacitor from time- out to ground. all devices are available in a preset out- put-voltage option of +1.8v, +2.5v, +3.3v, and +5v. the output voltage of the max6767?ax6774b is adjustablefrom +1.8v to +11v using a resistive divider at set. the max6773/max6774 include a watchdog timer (wdi) with a 1.6s (typ) watchdog timeout period and the max6773b/max6774b include a watchdog timer with a 50ms (typ) watchdog timeout period. the max6769/ max6770 feature an adjustable reset threshold using a resistive divider between the monitored voltage, resetin, and gnd; see the functional diagrams . the max6771/max6772 provide dual enable inputs(enable1 and enable2) to turn on and off the regula- tor either through an ignition switch or a bus transceiver. downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 10 maxim integrated functional diagrams max6765/max6766 thermal protection control logic 1.233v outreset gnd 1.147v or 1.085v overcurrent protection reset timeout in enable timeout downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 11 maxim integrated functional diagrams (continued) max6767/max6768 thermal protection control logic 116mv outset reset gnd overcurrent protection reset timeout in enable hold timeout 1.233v 1.147v or 1.085v downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 12 maxim integrated functional diagrams (continued) max6769/max6770 thermal protection control logic 116mv outset reset gnd overcurrent protection reset timeout resetin in enable timeout 1.233v 1.147v or 1.085v downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 13 maxim integrated functional diagrams (continued) max6771/max6772 thermal protection control logic outreset gnd overcurrent protection reset timeout in enable1 timeout enable2 116mv set 1.233v 1.147v or 1.085v downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 14 maxim integrated functional diagrams (continued) max6773/max6773b max6774/max6774b thermal protection control logic outreset gnd overcurrent protection reset timeout in enable timeout wdi 116mv set 1.233v 1.147v or 1.085v downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 15 maxim integrated regulator the regulator accepts an input voltage from +4v to +72v.all of the devices feature fixed output-voltage options of +1.8v, +2.5v, +3.3v, and +5v. the max6767?ax6774b feature an adjustable output voltage set with an external resistive-divider network connected between out, set, and gnd. see figure 1. enable and hold inputs (max6767/max6768) the max6767/max6768 support two logic inputs,enable (active-high) and hold (active-low), making these devices ?utomotive friendly.?for example, whenthe ignition key signal drives enable high, the regulator turns on and remains on even if enable goes low, as long as hold is forced low and kept low before enable goes low. in this state, releasing hold turns the regulator output (out) off. this feature makes it pos-sible to implement a self-holding circuit without external components. forcing enable low with hold high (or unconnected) places the max6767/max6768 into shut-down mode, drawing 3.3? (typ) of supply current. table 3 shows the state of the regulator output with respect to the voltage level at enable and hold . connect hold to out or leave it unconnected to allow the enable input to act as a standard enable/shut-down switch for the regulator output (out). reset output the reset output is typically connected to the resetinput of a ?. a ?? reset input starts or restarts the ? in a known state. the max6765?ax6774b superviso- ry circuits provide the reset logic to prevent code-exe- cution errors during power-up, power-down, and brownout conditions (see the typical application circuit ). reset changes from high to low whenever the monitored voltage drops below the reset threshold volt-ages. once the monitored voltage exceeds its respec- tive reset threshold voltage(s), reset remains low for the reset timeout period, then goes high. see table 1and table 2. resetin threshold (max6769/max6770) the max6769/max6770 monitor the voltage on resetinusing an adjustable reset threshold (v resetin ) set with an external resistive voltage-divider and the internal resetthreshold (v th ). see table 2. max6767?max6774b set r1r2 gnd in v in out figure 1. setting the output voltage using a resistive divider part suffix () output voltage (v) reset threshold (v) (all versions except max6769/max6770) resetin threshold (v) (max6769/max6770 only) l 5 4.625 1.147 m 5 4.375 1.085 t 3.3 3.353 1.147 s 3.3 2.888 1.085 2.5 2.313 1.147 y 2.5 2.188 1.085 w 1.8 1.665 1.147 v 1.8 1.575 1.085 table 2. preset output voltage and reset threshold part number suffix (_) timeout period d0 75? d1 3.125ms d2 12.5ms d3 50ms d4 200ms table 1. preset timeout period downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 16 maxim integrated watchdog timer (max6773/max6773b/ max6774/max6774b) the max6773/max6774 include a watchdog timer thatasserts reset if the watchdog input (wdi) does not toggle within the watchdog timeout period, t wd (1.6s (typ) for the max6773/max6774 and 50ms (typ) for themax6773b/max6774b). reset remains low for the reset timeout period, t rp . if the watchdog is not updat- ed for lengthy periods of time, the reset output appearsas a pulse train, asserted for the reset timeout period and deasserted for the watchdog timeout period, until wdi is toggled again. when reset asserts, it stays low for the entire reset timeout period ignoring any wditransitions. to prevent the watchdog from asserting reset , toggle wdi with a valid rising or falling edge prior to t wd (min). the watchdog counter clears when wdi toggles prior to t wd or when reset asserts. the watchdog resumes counting after reset deasserts. the watchdog timer cannot be disabled. thermal protection when the junction temperature exceeds t j = +160c (typ), an internal thermal sensor signals the shutdownlogic that turns off the pass transistor and allows the ic to cool. the thermal sensor turns the pass transistor on again after the ic? junction temperature cools by 20? (typ), resulting in a cycled output during continuous thermal-overload conditions. thermal protection pro- tects the max6765?ax6774b in the event of a fault condition. never exceed the absolute maximum junction temperature rating of t j = +150?. see figures 3 and 4 for the safe operating area. applications information output-voltage selection the max6767?ax6774b feature dual-mode operationand operate in either a preset or adjustable voltage mode. in preset voltage mode, internal trimmed feed-back resistors set the internal linear regulator to +1.8v, +2.5v, +3.3v, or +5v (see table 2). select preset- voltage mode by connecting set to ground. in adjustable mode, select an output voltage between +1.8v and +11v using two external resistors connected as a voltage-divider to set (see figure 1). set the output voltage using the following equation: v out = v set (1 + r1/r2) where v set = 1.233v and the recommended value for r2 is 50k (maximum 100k ). resetin threshold selection the max6769/max6770 feature an adjustable resetthreshold to monitor the voltage on resetin using a resistive divider between the monitored voltage, resetin and gnd. see figure 2. use the following formula to set the desired reset threshold: v mon = v th (1 + r3/r4) where v th is 1.085v for the m/s/y/v versions and 1.147v for the l/t/z/w versions. max6769 max6770 reset resetin r3r4 gnd in v in v mon figure 2. resetin threshold selection operating state enable hold regulator output comment initial state low don? care off enable is pulled to gnd through an internal pulldown. hold is high impedance (pulled up to out). regulator output is disabled. turn-on state high don? care on enable is externally driven high turning the regulator output on.hold is pulled up by out. holdsetup state high low on hold is externally pulled low while enable remains high (latches hold state). hold state low low on enable is driven low (or pulled low by an internal pulldown).hold remains externally pulled low keeping the regulator output on. off-state low high (pulled high) off hold is driven high (or pulled high by an internal pullup) while enable is low. regulator output is shut off and enable/hold logic returns to the initial state. table 3. enable/ hold truth table/state table downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 17 maxim integrated available output-current calculation the max6765?ax6774b provide up to 100ma of loadcurrent. package power dissipation limits the amount of output current available for a given input/output voltage and ambient temperature. figures 3 and 4 depict the maximum power dissipation curve for the max6765/ max6766 and max6767max6774b, respectively. the graph assumes that the exposed metal pad of the device package is soldered to a solid 1in 2 section of 2oz. pcb copper (jesd51-3 and jesd51-5). usefigure 4 to determine the allowable package dissipa- tion for a given ambient temperature. alternately, use the following formula to calculate the allowable pack- age dissipation: pd max = max. power dissip = 1.951w, for t a +70? pd max = max. power dissip = [1.9w - 0.0244w x (t a - 70?)], for +70? < t a +125? where 0.0244w is the max6767?ax6774b packagethermal derating in w/? and t a is the ambient tempera- ture in ?, under the same conditions used for figure 4.after determining the allowable package dissipation, calculate the maximum output current using the follow- ing formula: pd < pd max where pd = [(v in - v out ) x i out ] also, i out should be 100ma in any case. selecting timeout capacitor the reset timeout period is adjustable to accommodatea variety of ? applications. adjust the reset timeout period by connecting a capacitor between timeout and gnd. t rp = c timeout x 1.22 x 10 6 (l/m/t/s options) t rp = c timeout x 1.17 x 10 6 (v/w/y/z options) where t rp is in seconds and c timeout is in farads. connect timeout to out to select the internally fixedtimeout period. c timeout must be a low-leakage (< 10na) type capacitor. ceramic capacitors are recommended; do not use capacitor values lower than 100pf to avoid the influence of parasitic capacitances. capacitor selection and regulator stability for stable operation over the full temperature range andwith load currents up to 100ma, use a 10? (min) output capacitor with an esr < 0.5 . to reduce noise and improve load-transient response, stability, and power-supply rejection, use larger output-capacitor values. some ceramic dielectrics exhibit large capacitance and esr variation with temperature. for dielectric capacitors such as z5u and y5v, use more capaci- tance to ensure stability at low temperatures. with x7r or x5r dielectrics, 10? should be sufficient at all oper- ating temperatures. for higher-esr tantalum capaci- tors, use larger capacitor values to maintain stability. to improve power-supply rejection and transient response, use a larger capacitor than the minimum 0.1? capacitor between in and gnd. max6765 fig03 temperature ( c) pd (w) 140 120 80 100 40 60 20 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 0 0 160 derate 23.8mw/ c above +70 c 1.904w safe operating area max6765 fig04 temperature ( c) pd (w) 140 120 80 100 40 60 20 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 0 0 160 derate 24.4mw/ c above +70 c 1.951w safe operating area figure 3. maximum power dissipation vs. temperature (max6765/max6766) figure 4. maximum power dissipation vs. temperature (max6767?ax6774b) downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 18 maxim integrated ensuring a valid reset output down to v in = 0v (max6766/max6768/max6770/ max6772/max6774/max6774b) when v in falls below 1v, reset current-sinking capa- bilities decline drastically. high-impedance cmos-logic inputs connected to reset can drift to undetermined voltages. this presents no problems inmost applications, since most ?s and other circuitry do not operate with supply voltages below 1v. in appli- cations where reset must be valid down to 0v, adding a pulldown resistor between reset and ground sinks any stray leakage currents, holding reset low (figure 5). the value of the pulldown resistor is not critical;100k is large enough not to load reset and small enough to pull reset to ground. open-drain reset versions are not recommended for applications requir-ing valid logic for v in down to 0v. part output voltage (v) reset timeout period (ms) reset threshold (v) resetin threshold (v) top mark max6765ttld2+t 5 12.5 4.625 +aqb max6765ttsd2+t 3.3 12.5 2.888 +aql max6766ttld2+t 5 12.5 4.625 +aro max6766ttsd2+t 3.3 12.5 2.888 +arz max6767tald2+t 5 12.5 4.625 +avi max6767tasd2+t 3.3 12.5 2.888 +avs max6768tald2+t 5 12.5 4.625 +avz max6768tasd2+t 3.3 12.5 2.888 +axe max6769tald2+t 5 12.5 1.147 +ayh max6769tasd2+t 3.3 12.5 1.085 +ayq max6770tald2+t 5 12.5 1.147 +azs max6770tasd2+t 3.3 12.5 1.085 +bac max6771tald2+t 5 12.5 4.625 +beg max6771tasd2+t 3.3 12.5 2.888 +beq max6772tald2+t 5 12.5 4.625 +apy max6772tasd2+t 3.3 12.5 2.888 +bgc max6773tald2+t 5 12.5 4.625 +bbg max6773tasd2+t 3.3 12.5 2.888 +aqe max6773btald2+t 5 12.5 4.625 +bhk max6773btasd2+t 3.3 12.5 2.888 +bhu max6774tald2+t 5 12.5 4.625 +bcs max6774tasd2+t 3.3 12.5 2.888 +bdc max6774btald2+t 5 12.5 4.625 +biy max6774btasd2+t 3.3 12.5 2.888 +bji table 4. standard version part numbers max6766 max6768 max6770 max6772 max6774 max6774b reset gnd in v in figure 5. ensuring reset valid to v in = 0v downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 19 maxim integrated part reset output typical watchdog timeout output voltage resetin threshold enable inputs hold input max6765 open drain fixed single max6766 push-pull fixed single max6767 open drain fixed/adj single max6768 push-pull fixed/adj single max6769 open drain fixed/adj single max6770 push-pull fixed/adj single max6771 open drain fixed/adj dual max6772 push-pull fixed/adj dual max6773 open drain 1.6s fixed/adj single max6773b open drain 50ms fixed/adj single max6774 push-pull 1.6s fixed/adj single max6774b push-pull 50ms fixed/adj single selector guide max6766 12v battery v cc i/o lin ingnd timeout reset out enable c xcvr txd rxd reset typical application circuit downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 20 maxim integrated 1 + 34 86 5 outset reset max6767 max6768 2 7 timeout enable gnd in hold tdfn top view 1 + 34 86 5 outset reset max6769 max6770 2 7 timeout enable gnd in resetin tdfn top view 1 + 34 86 5 outset reset max6771 max6772 2 7 timeout enable1 gnd in enable2 tdfn top view 1 + 34 86 5 outset reset max6773 max6773b max6774 max6774b 2 7 timeout enable gnd in wdi tdfn top view ep ep ep ep pin configurations (continued) downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor 21 maxim integrated chip information process: bicmos part temp range pin- package max6766 tt_d_+ -40? to +125? 6 tdfn-ep* max6767 ta_d_/v+ -40? to +125? 8 tdfn-ep* max6768 ta_d_+ -40? to +125? 8 tdfn-ep* max6769 ta_d_+ -40? to +125? 8 tdfn-ep* max6769 ta_d_/v+ -40? to +125? 8 tdfn-ep* max6770 ta_d_+ -40? to +125? 8 tdfn-ep* max6771 ta_d_+ -40? to +125? 8 tdfn-ep* max6772 ta_d_+ -40? to +125? 8 tdfn-ep* max6773 ta_d_/v+ -40? to +125? 8 tdfn-ep* max6773bta_d_/v+ -40? to +125? 8 tdfn-ep* max6774 ta_d_+ -40? to +125? 8 tdfn-ep* max6774bta_d_+ -40? to +125? 8 tdfn-ep* ordering information (continued) the first ??is a placeholder for the voltage output and reset threshold. the 2nd ??designates the fixed reset-timeout option. see tables 1 and 2 for details. for example, the max6765ttld4 has a 5v output, a reset threshold of 4.65v, and a 200ms typical reset timeout. + denotes a lead(pb)-free/rohs-compliant package. /v denotes an automotive qualified part. * ep = exposed pad. for tape-and-reel orders add a ??after the ??symbol to com- plete the part number. tape-and-reel orders are available in 2.5k increments. nonstandard versions require a 10k minimum order quantity. package information for the latest package outline information and land patterns (foot-prints), go to www.maximintegrated.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only.package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code outline no. land pattern no. 6 tdfn-ep t633+2 21-0137 90-0058 8 tdfn-ep t833+2 21-0137 90-0059 downloaded from: http:///
max6765?ax6774 automotive micropower linear regulators with supervisor maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. 22 ________________________________ maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 2013 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. revision history revision number revision date description pages changed 0 10/06 initial release 1 1/07 introduced max6765 and max6766 1, 21, 23 2 7/07 added the max6773b and max6774d to data sheet. updated features , general description , ordering information , functional diagrams , table 4, selector guide , watchdog timer section, and pin configurations . 1, 4, 8, 9, 14, 16, 18?3 3 9/07 revised typical operating characteristics 7 4 6/10 added /v to the max6765tt_d_+ 1 5 10/11 added /v to the max6773ta_d_+; added timeout ramp threshold to electrical characteristics table. changed t rp formula in selecting timeout capacitor section. 4, 17, 21 6 3/12 added /v to the max6769ta_d_/v+ 21 7 10/12 added /v to the max6767ta_d_/v+ 21 8 4/13 updated tables 2 and 4 15, 18 downloaded from: http:///

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