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ltc1443/ lt c1444/ lt c1445 1 144345fe typical application description ultralow power quad comparators with reference the lt c ? 1443/ltc1444 / ltc1445 are ultralow power quad comparators with a built-in reference. the comparators feature less than 8.5 a supply current over temperature, an internal reference (1.182 v 1% for ltc1443 or 1.221 v 1% for ltc1444/ltc1445), programmable hysteresis (ltc1444/ltc1445) and ttl /cmos output ( ltc1443/ ltc1445) that sinks and sources current ( open-drain output for ltc1444). the reference output can drive a bypass capacitor of up to 0.01f without oscillation. the comparators operate from a single 2 v to 11 v supply or a dual 1v to 5.5 v supply ( ltc1443). comparator hysteresis is easily programmable using two resistors and the hyst pin ( ltc1444/ltc1445). each comparators input operates from the negative supply to within 1.3 v of the positive supply. the ltc1443/ltc1445 comparator output stage can continuously source up to 40 ma. by eliminating the cross-conducting current that normally happens when the comparator changes logic states, power supply glitches are eliminated. the ltc1443/ltc1444/ltc1445 are available in the 16-pin so, pdip and dfn packages. features applications n ultralow quiescent current: 8.5a max n reference output drives 0.01f capacitor n adjustable hysteresis (ltc1444/ltc1445) n wide supply range single: 2v to 11v dual: 1v to 5.5v n input voltage range includes the negative supply n ttl /cmos compatible outputs n propagation delay: 12s ( typ ) (10mv overdrive) n no crowbar current n 40ma continuous source current n pin compatible upgrades for max924 (ltc1443) n low profile (5mm 4mm 0.8mm) dfn package n battery-powered system monitoring n threshold detectors n window comparators n oscillator circuits reference settling test circuit C + in a + 5 out v + 1.2v r1 10k r3430 r22.4m c11.0f in a C hyst ref 4 14 8 5vto 8v 144345 ta01 ltc1445 3 9 2 1.21m1% 3.4m1% v in + C v C reference settling l , lt , lt c , lt m , linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. v + 8v5v v ref 144345 ta02 out 2ms/div 2mv/div downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 2 144345fe absolute maximum ratings voltage : v + to v C , v + to gnd, gnd to v C ........... 12v to C 0.3v in + , in C , hyst .................. (v + + 0.3v) to (v C C 0.3v) ref ................................... (v + + 0.3v) to (v C C 0.3v) out (ltc1443) ............... (v + + 0.3v) to (gnd C 0.3v) out (ltc1444/ltc1445) ........ (v + + 0.3v) to (v C C 0.3v) current: in + , in C , hyst ................................................. 20ma ref ................................................................... 20ma out .................................................................. 50ma (note 1) 12 3 4 5 6 7 8 top view s package 16-lead plastic so n package 16-lead pdip 1615 14 13 12 11 10 9 out bout a v + in a C in a + in b C in b + ref out cout d gnd/hyst ? in d + in d C in c + in c C v C t jmax = 150c, ja = 90c/ w (n) t jmax = 150c, ja = 150c/ w (s) ? pin 14 is gnd for the ltc1443 ? pin 14 is hyst for the ltc1444 and ltc1445 1615 14 13 12 11 10 9 17 12 3 4 5 6 7 8 out cout d gnd/hyst ? in d + in d C in c + in c C v C out bout a v + in a C in a + in b C in b + ref top view dhd16 package 16-lead (5mm 4mm) plastic dfn t jmax = 125c, ja = 41.7c/ w exposed pad (pin 17) internally connected to v C ? pin 14 is gnd for the ltc1443 ? pin 14 is hyst for the ltc1444 and ltc1445 pin configuration out short-circuit duration (v + 5.5v) ........ continuous power dissipation .............................................. 500mw operating temperature range commercial ..............................................0c to 70c industrial ............................................ ? 40c to 85c storage temperature range pdip, so ............................................ ?65c to 150c dfn .................................................... ?65c to 150c lead temperature range (soldering, 10 sec) pdip, so ........................................................... 300c downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 3 144345fe order information lead free finish tape and reel part marking* package description specified temperature range ltc1443cn#pbf ltc1443cn#trpbf ltc1443cn 16-lead pdip 0c to 70c ltc1443cs#pbf ltc1443cs#trpbf ltc1443cs 16-lead plastic so 0c to 70c ltc1443in#pbf ltc1443in#trpbf ltc1443in 16-lead pdip C40c to 85c ltc1443is#pbf ltc1443is#trpbf ltc1443is 16-lead plastic so C40c to 85c ltc1444cn#pbf ltc1444cn#trpbf ltc1444cn 16-lead pdip 0c to 70c ltc1444cs#pbf ltc1444cs#trpbf ltc1444cs 16-lead plastic so 0c to 70c ltc1444in#pbf ltc1444in#trpbf ltc1444in 16-lead pdip C40c to 85c ltc1444is#pbf ltc1444is#trpbf ltc1444is 16-lead plastic so C40c to 85c ltc1445cn#pbf ltc1445cn#trpbf ltc1445cn 16-lead pdip 0c to 70c ltc1445cs#pbf ltc1445cs#trpbf ltc1445cs 16-lead plastic so 0c to 70c ltc1445in#pbf ltc1445in#trpbf ltc1445in 16-lead pdip C40c to 85c ltc1445is#pbf ltc1445is#trpbf ltc1445is 16-lead plastic so C40c to 85c ltc1443cdhd#pbf ltc1443cdhd#trpbf 1443 16-lead (5mm 4mm) plastic dfn 0c to 70c ltc1443idhd#pbf ltc1443idhd#trpbf 1443 16-lead (5mm 4mm) plastic dfn C40c to 85c ltc1444cdhd#pbf ltc1444cdhd#trpbf 1444 16-lead (5mm 4mm) plastic dfn 0c to 70c ltc1444idhd #pbf ltc1444idhd#trpbf 1444 16-lead (5mm 4mm) plastic dfn C40c to 85c ltc1445cdhd#pbf ltc1445cdhd#trpbf 1445 16-lead (5mm 4mm) plastic dfn 0c to 70c ltc1445idhd#pbf ltc1445idhd#trpbf 1445 16-lead (5mm 4mm) plastic dfn C40c to 85c consult lt c marketing for parts specified with wider operating temperature ranges . * the temperature grade is identified by a label on the shipping container . consult lt c marketing for information on nonstandard lead based finish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ symbol parameter conditions min typ max units power supplyv + supply voltage range l 2.0 11.0 v i cc supply current in + = in C = 80mv hyst = ref (ltc1444/ltc1445) l 5.5 8.5 a comparatorv os comparator input offset voltage v cm = 2.5v l 3.0 10.0 mv i in input leakage current (in + , in C ) v in + = v in C = 2.5v l 0.01 1.0 na input leakage current (hyst) ltc1444/ltc1445 l 0.02 1.0 na v cm comparator input common mode range l v C v + C 1.3v v cmrr common mode rejection ratio v C to (v + C 1.3v) 0.1 1.0 mv/v psrr power supply rejection ratio v + = 2v to 11v 0.1 1.0 mv/v noise voltage noise 100hz to 100khz 20 v rms v hyst hysteresis input voltage range ltc1444, ltc1445 l ref C 50mv ref v t pd propagation delay overdrive = 10mv, c out = 100pf overdrive = 100mv, c out = 100pf 12 4 s s the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. v + = 5v, v ? = gnd = 0v, unless otherwise noted. electrical characteristics downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 4 144345fe electrical characteristics the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. v + = 5v, v ? = gnd = 0v, unless otherwise noted. symbol parameter conditions min typ max units power supplyv + supply voltage range l 2.0 11.0 v i cc supply current in + = in C = 80mv, hyst = ref l 5 8 a comparatorv os comparator input offset voltage v cm = 1.5v l 3.0 10.0 mv i in input leakage current (in + , in C ) v in + = v in C = 1.5v l 0.01 1.0 na input leakage current (hyst) ltc1444/ltc1445 l 0.02 1.0 na v cm comparator input common mode range l v C v + C 1.3v v cmrr common mode rejection ratio v C to (v + C 1.3v) 0.1 1.0 mv/v psrr power supply rejection ratio v + = 2v to 11v 0.1 1.0 mv/v noise voltage noise 100hz to 100khz 100 v rms v hyst hysteresis input voltage range ltc1444, ltc1445 l ref C 50mv ref v t pd propagation delay overdrive = 10mv, c out = 100pf overdrive = 100mv, c out = 100pf 14 5 s s v oh output high voltage i o = C 10ma; ltc1443/ltc1445 l v + C 0.4v v v ol output low voltage i o = 0.8ma; ltc1443 i o = 0.8ma; ltc1444/ltc1445 l l gnd + 0.4v v C + 0.4v v v referencev ref reference voltage no load, ltc1443 c temp range l 1.170 1.182 1.194 v i temp range l 1.164 1.200 v no load, ltc1444/ ltc1445 c temp range l 1.209 1.221 1.233 v i temp range l 1.203 1.239 v i source reference output source current ?v ref 1mv l 60 120 a i sink reference output sink current ?v ref 2.5mv ?v ref 5mv l 10 10 15 15 a a noise noise voltage 100hz to 100khz 100 v rms the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. v + = 3v, v ? = gnd = 0v, unless otherwise noted. note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. symbol parameter conditions min typ max units v oh output high voltage i o = ? 15ma; ltc1443/ltc1445 l v + ? 0.4v v v ol output low voltage i o = 1.8ma; ltc1443 i o = 1.8ma; ltc1444/ltc1445 l l gnd + 0.4v v ? + 0.4v v v referencev ref reference voltage no load, ltc1443 c temp range l 1.170 1.182 1.194 v i temp range l 1.164 1.200 v no load, ltc1444/ ltc1445 c temp range l 1.209 1.221 1.233 v i temp range l 1.203 1.239 v i source reference output source current ?v ref 1mv l 100 200 a i sink reference output sink current ?v ref 2.5mv ?v ref 5mv l 10 10 15 15 a a noise voltage noise 100hz to 100khz 100 v rms downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 5 144345fe typical performance characteristics supply current vs supply voltage supply current vs temperature ltc1444/ltc1445 reference voltage vs temperature ltc1443 reference voltage vs temperature ltc1443 reference output voltage vs output load current ltc1444/ltc1445 hysteresis control v ref C v hyst (mv) 0 in + C in C (mv) C20 0 20 30 50 144345 g01 C40 C60 C80 10 20 40 40 60 80 supply voltage (v) 1.0 4.0 supply current (a) 4.2 4.4 4.6 4.8 5.0 5.2 1.5 2.0 2.5 3.0 144345 g02 t a = 25c temperature (c) C60 supply current (a) 20 5.85.4 5.0 4.6 4.2 3.8 3.4 3.0 144345 g03 C20 60 C40 40 0 80 100 120 in + = (in C + 100mv) v C = gnd (ltc1443) v + = 3v v C = 0v v + = 5v v C = 0v v + = 5v v C = C5v temperature (c) C60 1.208 reference voltage (v) 1.212 1.216 1.220 1.224 C40 C20 0 20 144345 g04 40 60 80 100 120 v + = 5v temperature (c) C60 reference voltage (v) 1.1861.184 1.182 1.180 1.178 1.176 1.174 1.172 1.170 100 144345 g05 C20 20 60 80 C40 0 40 120 140 v + = 5v v C = gnd load current (ma) reference voltage (v) 1.1841.183 1.182 1.181 1.180 1.179 1.178 0.2 0.4 0.6 0.8 144345 g06 1.0 0.1 0 0.3 0.5 0.7 0.9 v + = 5v v C = gnd t a = 25c source ltc1443 reference output voltage vs output load current comparator output voltage high vs load current comparator output voltage low vs load current load current (a) 0 reference output voltage (v) 20 1.1941.192 1.190 1.188 1.186 1.184 1.182 1.180 144345 g07 10 30 5 25 15 35 40 45 v + = 5v v C = gnd t a = 25c sink load current (ma) 0 1.0 output voltage high (v) 2.0 3.0 4.0 5.0 10 20 30 40 144345 g08 50 60 v + = 5v v + = 3v v + = 2v t a = 25c load current (ma) 0 output voltage low (v) 1.5 2.0 2.5 30 50 80 144345 g09 1.0 0.5 0 10 20 40 60 70 v + = 2v v + = 3v v + = 5v t a = 25c downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 6 144345fe typical performance characteristics comparator response time vs input overdrive comparator response time vs input overdrive comparator short-circuit sink current vs supply voltage comparator response time vs load capacitance comparator short-circuit source current vs supply voltage comparator response time at low supply voltage supply current vs comparator input frequency response time (s) C1 input voltage (mv) output voltage (v) 100 0 1 6 4 5 144345 g10 0 2 0 10 8 2 3 4 100mv 10mv 50mv 20mv t a = 25c response time (s) C1 input voltage (mv) output voltage (v) 0 0 1 6 14 18 5 144345 g11 100 2 10 4 12 16 0 8 2 3 4 100mv 10mv 50mv 20mv t a = 25c supply voltage (v) 0 sink current (ma) 200180 160 140 120 100 8060 40 20 0 8 144345 g12 2 1 3 5 7 9 4 6 10 out connected to v + t a = 25c supply voltage (v) 0 source current (ma) 3 5 144345 g13 1 2 4 160140 120 100 8060 40 20 0 out connected to v C = gnd = 0v load capacitance (nf) 0 response time (s) 1210 86 4 2 80 144345 g14 20 40 60 100 t phl t plh input frequency (hz) 1 supply current (a) 10000 1000 100 10 1 100 10k 100k 10 1k 144345 g15 c out = 55pf c out = 15pf c out = 5pf supply voltage (v) 1 response time (s) 10000 1000 100 10 1 1.2 1.4 1.6 1.1 1.3 1.5 144345 g16 20mv overdrive 100mv overdrive downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 7 144345fe pin functions out b ( pin 1): comparator b output . ( open-drain output for ltc1444). output can source up to 40 ma ( ltc1443, ltc1445) and sink 5ma. out a ( pin 2): comparator a output . ( open-drain output for ltc1444). output can source up to 40 ma ( ltc1443, ltc1445) and sink 5ma.v + (pin 3): positive supply. in a ? ( pin 4): inverting input of comparator a. input common mode range from v C to v + C 1.3 v. input current typically 10pa at 25c. in a + ( pin 5): noninverting input of comparator a. input common mode range from v C to v + C 1.3 v. input current typically 10pa at 25c. in b ? ( pin 6): inverting input of comparator b. input common mode range from v C to v + C 1.3 v. input current typically 10pa at 25c. in b + ( pin 7): noninverting input of comparator b. input common mode range from v C to v + C 1.3 v. input current typically 10pa at 25c.ref ( pin 8): reference output. with respect to v C . can source up to 200 a and sink 15 a at 25 c. drive 0.01 f bypass capacitor without oscillation.v ? ( pin 9): negative supply. connect to ground for single supply operation on ltc1443. in c ? ( pin10): inverting input of comparator c. input common mode range from v C to v + C 1.3 v. input current typically 10pa at 25c. in c + ( pin 11): noninverting input of comparator c. input common mode range from v C to v + C 1.3 v. input current typically 10pa at 25c. in d ? ( pin 12): inverting input of comparator d. input common mode range from v C to v + C 1.3 v. input current typically 10pa at 25c. in d + ( pin 13): noninverting input of comparator d. input common mode range from v C to v + C 1.3 v. input current typically 10pa at 25c.gnd ( pin 14): ltc1443 ground. connect to v C for single supply operation.hyst ( pin 14): ltc1444/ltc1445 hysteresis input. con- nect to ref if not used. input voltage range is from v ref to v ref C 50mv. out d ( pin 15): comparator d output . ( open-drain output for ltc1444). output can source up to 40 ma ( ltc1443, ltc1445) and sink 5ma. out c ( pin 16): comparator c output . ( open-drain output for ltc1444). output can source up to 40 ma ( ltc1443, ltc1445) and sink 5ma. exposed pad ( pin 17, dfn package): this pin is internally connected to vC. connection is optional, but will improve thermal dissipation. C + C + out bout a v + in a C in a + in b C in b + ref out c out d gnd in d + in d C in c + in c C v C + C + C ltc1443 12 3 4 5 6 7 8 1615 14 13 12 11 10 9 1.2v + C C + C + out bout a v + in a C in a + in b C in b + ref out c out d hyst in d + in d C in c + in c C v C + C + C ltc1444/ltc1445 12 3 4 5 6 7 8 1615 14 13 12 11 10 9 144345 pf 1.2v + C downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 8 144345fe applications information the ltc1443 / ltc1444 / ltc1445 is a family of quad micropower comparators with a built - in reference (1.182 v for the ltc1443 and 1.221 v for the ltc1444/ltc1445). features include programmable hysteresis ( ltc1444/ ltc1445), wide supply voltage range (2 v to 11 v) and the ability of the reference to drive up to a 0.01 f capacitor with - out oscillation. the comparator cmos outputs ( ltc1443/ ltc1445) can source up to 40 ma while the ltc1444 has an open-drain output to v C . the supply current glitches that normally occur when the comparator output switches states have been eliminated.power supplies the comparator family operates from a single 2 v to 11 v supply. the ltc1443 includes a separate ground for the comparator output stage, allowing a split supply ranging from 1v to 5.5 v. connecting v C to gnd on the ltc1443 allows single supply operation. if the comparator output is required to source more than 1 ma or the supply source impedance is high, v + should be bypassed with a 0.1 f capacitor. comparator inputs the comparator inputs can swing from the negative sup- ply ( v C ) to within 1.3 v maximum of the positive supply (v + ). the inputs can be forced 300 mv below v C or above v + without damage, and the typical input leakage current is only 10pa.comparator outputs the ltc1443 comparator output swings between gnd and v + to assure ttl compatibility with a split supply. the ltc1444 and ltc1445 outputs swing between v C and v + . the outputs are capable of sourcing up to 40 ma (ltc1443/ltc1445) and sinking up to 5 ma while still maintaining microampere quiescent currents. the output stage does not generate crowbar switching currents dur- ing transitions which helps minimize parasitic feedback through the supply pins. voltage reference the internal bandgap reference has a voltage of 1.182 v for ltc1443 or 1.221 v for ltc1444/ltc1445 referenced to v C . the reference accuracy is 1.5% from C40c to 85 c. it can source up to 200 a and sink up to 15 a with a 5 v supply. the reference can drive a bypass capacitor of up to 0.01 f without oscillation and by inserting a series resistor , capacitance values up to 100f can be used (figure 1).figure 2 shows the resistor value required for different capacitor values to achieve critical damping. capacitor value ( f) 0.001 0.1 resistor value (k ) 10 1000 0.01 0.1 10 1 144345 f02 1 100 figure 2. damping resistance vs bypass capacitor value ltc144x v C ref r1 c1 reference output 144345 f01 1.2v + C figure 1. damping the reference output downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 9 144345fe applications information bypassing the reference can help prevent false tripping of the comparators by preventing glitches on the v + or the reference output voltage. figure 3 shows the bypassed reference output with a square wave applied to the v + pin. resistors r1 and r2 set 10 mv of hysteresis, while r3 damps the reference response. note that the comparator output doesnt trip. hysteresis hysteresis can be added to the ltc1444/ltc1445 by con- necting a resistor ( r1) between the ref and hyst pins, and a second resistor (r2) from hyst to v C (figure 4). the difference between the upper and lower threshold volt - ages or hysteresis voltage band ( v hb ) is equal to twice the voltage difference between the ref and hyst pins. when more hysteresis is added, the upper threshold increases the same amount as the lower threshold decreases. the maximum voltage allowed between ref and hyst is 50mv, producing a maximum hysteresis voltage band of 100mv. if hysteresis is not wanted, the hyst pin should be shorted to ref. acceptable values for i ref range from 0.1a to 5 a. if 2.4 m is chosen for r2, then r1(k ) = v hb (mv). in a + 5 out v + r1 10k r3430 r22.4m c11.0f in a C hyst ref 4 14 8 5vto 8v 144345 f03a ltc1445 3 9 2 C + 1.2v + C v C figure 3a. v + glitching test circuit figure 3b. v + glitching response figure 4. programmable hysteresis 8 r2 hyst ref 14 r1 144345 f04 ltc1445 9 i ref r1 = v hb (2)(i ref ) r2 = i ref v hb 2 ( ) 1.221v C v + 8v5v v ref 144345 f03b out 2ms/div 2mv/div downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 10 144345fe applications information level detector the ltc1444 is ideal for use as a multisupply micropower level detector as shown in figure 5. r1 and r2 form a voltage divider from v1 to the non- inverting comparator a input. r6 and r7 are used to divide down v2, while r8 is the output pull-up resistor for the comparator outputs. r3 and r4 set the hysteresis voltage and r5 and c1 bypass the reference output. in a + 5 out bout a v + r3 15k, 1% r5430 5% r42.4m 1% c11.0f in a C hyst ref 4 14 8 in b + 7 in b C 6 C + 144345 f05 1/2ltc1444 3 9 2 1 r11.21m 1% r23.40m 1% v1 r71.21m 1% r61.82m 1% v2 r82m 1% 5v C + v C 1.2v + C figure 5. glitch-free level detector with hysteresis the following design procedure can be used to select the component values:1. choose the v 1 voltage trip level, in this example 4.65 v. 2. calculate the required resistive divider ratio. ratio = v ref / v in ratio = 1.221v/4.65v = 0.263 3. choose the required hysteresis voltage band at the input , v hbin , in this example 60 mv. calculate the hysteresis voltage band referred to the comparator input v hb . v hb = (v hbin )(ratio) v hb = (60mv)(0.263) v hb = 15.78mv 4. choose the values for r3 and r4 to set the hysteresis. r4 = 2.4m r3(k) = v hb = 15k 5. choose the values for r1 and r2 to set the trip point. r1 = v ref /i bias = 1.221v/1a 1.21m r2 = r1 ( ) v in v ref + v hb 2 ? 1 ?? ?? ? ?? ?? ? r2 = 1.21m ( ) 4.65v 1.221v + 15mv 2 ? 1 ?? ?? ? ?? ?? ? r2 = 3.40m using the same equations, r6 and r7 are 1.82 m and 1.21m, respectively, to set the trip level at 3v for v2. downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 11 144345fe .016 C .050 (0.406 C 1.270) .010 C .020 (0.254 C 0.508) 45 0 C 8 typ .008 C .010 (0.203 C 0.254) 1 n 2 3 4 5 6 7 8 n/2 .150 C .157 (3.810 C 3.988) note 3 16 15 14 13 .386 C .394 (9.804 C 10.008) note 3 .228 C .244 (5.791 C 6.197) 12 11 10 9 s16 rev g 0212 .053 C .069 (1.346 C 1.752) .014 C .019 (0.355 C 0.483) typ .004 C .010 (0.101 C 0.254) .050 (1.270) bsc .245 min n 1 2 3 n/2 .160 .005 recommended solder pad layout .045 .005 .050 bsc .030 .005 typ inches (millimeters) note:1. dimensions in 2. drawing not to scale3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm) 4. pin 1 can be bevel edge or a dimple s package 16-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610 rev g) n16 rev i 0711 .255 .015* (6.477 0.381) .770* (19.558) max 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 .020 (0.508) min .120 (3.048) min .130 .005 (3.302 0.127) .065 (1.651) typ .045 C .065 (1.143 C 1.651) .018 .003 (0.457 0.076) .008 C .015 (0.203 C 0.381) .300 C .325 (7.620 C 8.255) .325 +.035C.015 +0.889 C0.381 8.255 ( ) note:1. dimensions are inches millimeters *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .010 inch (0.254mm) .100 (2.54) bsc n package 16-lead pdip (narrow .300 inch) (reference ltc dwg # 05-08-1510 rev i) package description downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 12 144345fe 4.00 0.10 (2 sides) 5.00 0.10 (2 sides) note:1. drawing proposed to be made variation of version (wjgd-2) in jedec package outline mo-229 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package 0.40 0.10 bottom viewexposed pad 2.44 0.10 (2 sides) 0.75 0.05 r = 0.115 typ r = 0.20 typ 4.34 0.10 (2 sides) 1 8 16 9 pin 1 top mark (see note 6) 0.200 ref 0.00 C 0.05 (dhd16) dfn 0504 0.25 0.05 pin 1notch 0.50 bsc 4.34 0.05 (2 sides) recommended solder pad pitch and dimensions 2.44 0.05 (2 sides) 3.10 0.05 0.50 bsc 0.70 0.05 4.50 0.05 packageoutline 0.25 0.05 dhd package 16-lead plastic dfn (5mm 4mm) (reference ltc dwg # 05-08-1707 rev ?) package description downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 13 144345fe information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. revision history rev date description page number d 4/11 minor update to figure 5 in the applications information section 10 e 5/12 internal voltage reference symbol updated 1, 7, 8, 9, 10, 14 dfn package description corrected 2 dfn storage temperature range increased to 150c 2 order information corrected 3 related parts updated 14 (revision history begins at rev d) downloaded from: http:///
ltc1443/ lt c1444/ lt c1445 14 144345fe linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 1995 lt 0512 rev e ? printed in usa related parts typical application part number description comments ltc1041 bang-bang controller with 1na off current 2.8v to 18v, ideal for temperature or motor control circuit ltc1042 micropower, high accuracy window comparator fault detect, go/no go test, supply monitor ltc1440/ltc1540 ultralow power comparator with reference 1.128v 1% reference, 10mv (max) input offset ltc1441/ltc1442 dual ultralow power comparators with reference 1.182v 1% reference, 8s prop delay, 5.7a ltc1541/ltc1542 combined amplifier, comparator and reference 1.2v 0.8 reference, amplifier stable with 1000pf load ltc1842/ltc1843 dual ultralow power comparators with reference 1.182v 1% reference, 4s, 3.5a, open-drain out ltc1921 dual independent monitors for C48v supply and fuse C48v telecom and network backplane monitor ltc1998 high accuracy comparator with 1.2v reference adjustable threshold and hysteresis, 2.5ma supply lt ? 6700 dual comparators with 400mv reference 1.4v to 18v operation, 18s prop delay, available in sot-23 and 2mm 3mm dfn packages lt6703 single comparator with 400mv reference 1.4v to 18v operation, 6.5a supply current, available in sot-23 and 2mm 2mm dfn packages single cell to 5v supply ncnc 3 67 54 1110 3 1 4 6 2, 4 16 15 1312 144345 ta03 7 5 1 2 3 14 8ref c2, c3: aux tpsd107m010r0100 or sanyo os-con 16sa100m r5 51k 5% 2 8 1 c2100f c3100f r8732k 1% r9 267k 1% pwr gnd gnd v in sw l1 10h sumida cd54-100 d1 1n5817 i lim sel sense shdn lt1300 q1 mmft2955eti c11f r103.37m 5% r1151k 5% r12 51k 5% C + c 1/4 ltc1444 C + a 1/4 ltc1444 C + d 1/4 ltc1444 c40.22f v cc p nmireset r7 51k 5% r282.5k 1% r1 1.1m 5% r31m 1% 1 celllithium- ion battery r42.4m 5% r6430 5% ltc1444ref C + b 1/4 ltc1444 hyst v + + + 1.2v 9 + C v C downloaded from: http:///

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