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lt6700-1/lt6700-2/lt6700-3 1 6700123fd the lt 6700-1/lt6700-2/lt6700-3 combine two micropower, low voltage comparators with a 400mv reference in a 6-lead sot-23 or tiny dfn package. oper- ating with supplies from 1.4v up to 18v, these devices draw only 6.5 a typical, making them ideal for low voltage system monitoring. hysteresis is included in the com- parators, easing design requirements to insure stable output operation. the comparators each have one input available externally, the other inputs are connected internally to the reference. the comparator outputs are open collector and the output load can be referred to any voltage up to 18v, independent of supply voltage. the output stage sinking capability is guaranteed greater than 5ma over temperature. the three versions of this part differ by the polarity of the available comparator inputs. the lt6700-1 has one in- verting input and one noninverting input, making it suit- able for use as a window comparator. the lt6700-2 has two inverting inputs and the lt6700-3 has two noninvert- ing inputs. all versions are offered in commercial, industrial and automotive temperature ranges. internal 400mv reference total threshold error: 1.25% max at 25 c wide supply range: 1.4v to 18v specified for ?0 to 125 c temperature range low quiescent current: 6.5 a typ at 5v internal hysteresis: 6.5mv typ low input bias current: 10na max over-the-top input also includes ground open-collector outputs allows level translation choice of input polarities: lt6700-1/lt6700-2/ lt6700-3 available in low profile (1mm) sot-23 (thinsot tm ) and 2mm 3mm dfn packages micropower, low voltage, dual comparator with 400mv reference , lt, ltc and ltm are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. over-the-top is a registered trademark of linear technology. thinsot is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. + + comp b 1m comp a alkaline aa cells v r = 400mv reference 0.1 f 1m lt6700-3 63.4k 261k 1m v batt > 1.6v v batt > 2v monitor consumes ~10 a hysteresis is approximately 2% of trip voltage 6700123 ta01 v batt 1.4v (min) 3v (nom) + + v s comparator thresholds vs temperature temperature ( c) ?0 threshold voltage (mv) 398 400 402 120 6700123 ta02 396 394 390 ?0 ?0 0 20 40 60 80 100 392 406 404 two typical parts comp a and b v s = 5v #1a #1b #2a #2b rising input falling input micropower battery monitor descriptio u features typical applicatio u battery-powered system monitoring threshold detectors window comparators relay driving optoisolator driving industrial control systems handheld instruments applicatio s u
lt6700-1/lt6700-2/lt6700-3 2 6700123fd total supply voltage (v s to gnd) ......................... 18.5v input voltage (+in, ?n) (note 3) ...................................... 18.5v to (gnd ?0.3v) output voltage (out) ................. 18.5v to (gnd ?0.3v) output short-circuit duration (note 2) ............ indefinite input current (note 3) ........................................ ?0ma operating temperature range (note 4) lt6700cs6/lt6700cdcb-1/-2/-3 ...... 40 c to 85 c lt6700is6/lt6700idcb-1/-2/-3 ........ 40 c to 85 c lt6700hs6/lt6700hdcb-1/-2/-3 .... 40 c to 125 c (note 1) absolute axi u rati gs w ww u package/order i for atio uu w specified temperature range (note 5) lt6700cs6/lt6700cdcb-1/-2/-3 ...... 40 c to 85 c lt6700is6/lt6700idcb-1/-2/-3 ........ 40 c to 85 c lt6700hs6/lt6700hdcb-1/-2/-3 .... 40 c to 125 c maximum junction temperature s6 package ....................................................... 150 c dcb6 package .................................................. 125 c storage temperature range s6 package ........................................ ?5 c to 150 c dcb6 package ................................... ?5 c to 125 c lead temperature (soldering, 10 sec).................. 300 c order part number s6 part marking* lt6700cs6-1 lt6700is6-1 lt6700hs6-1 ltk7 order part number s6 part marking* lt6700cs6-2 lt6700is6-2 lt6700hs6-2 ltadl order part number s6 part marking* lt6700cs6-3 lt6700is6-3 lt6700hs6-3 ltadm t jmax = 150 c, ja = 230 c/w outa 1 gnd 2 +ina 3 6 outb 5 v s 4 inb top view s6 package 6-lead plastic tsot-23 t jmax = 150 c, ja = 230 c/w outa 1 gnd 2 ina 3 6 outb 5 v s 4 inb top view s6 package 6-lead plastic tsot-23 t jmax = 150 c, ja = 230 c/w outa 1 gnd 2 +ina 3 6 outb 5 v s 4 +inb top view s6 package 6-lead plastic tsot-23 order part number dcb6 part marking* lt6700cdcb-1 lt6700idcb-1 lt6700hdcb-1 lbxw order part number dcb6 part marking* lt6700cdcb-2 lt6700idcb-2 lt6700hdcb-2 lbxx order part number dcb6 part marking* lt6700cdcb-3 lt6700idcb-3 lt6700hdcb-3 lbxy t jmax = 125 c, ja = 160 c/w exposed pad (pin 7) internally connected to gnd (pcb connection optional) t jmax = 125 c, ja = 160 c/w exposed pad (pin 7) internally connected to gnd (pcb connection optional) t jmax = 125 c, ja = 160 c/w exposed pad (pin 7) internally connected to gnd (pcb connection optional) top view + ina gnd ?nb outa outb v s dcb6 package 6-lead (2mm 3mm) plastic dfn 4 5 7 6 3 2 1 top view ?ina gnd ?nb outa outb v s dcb6 package 6-lead (2mm 3mm) plastic dfn 4 5 7 6 3 2 1 top view + ina gnd +inb outa outb v s dcb6 package 6-lead (2mm 3mm) plastic dfn 4 5 7 6 3 2 1 *the temperature grades are identified by a label on the shipping container. consult ltc marketing for parts specified with wider operating temperature ranges. order options tape and reel: add #tr lead free: add #pbf lead free tape and reel: add #trpbf lead free part marking: http://www.linear.com/leadfree/
lt6700-1/lt6700-2/lt6700-3 3 6700123fd symbol parameter conditions min typ max units v th(r) rising input threshold voltage (note 6) r l = 100k, v o = 2v swing v s = 1.4v 391.0 409.0 mv v s = 5v 392.5 407.5 mv v s = 12v 390.0 410.0 mv v s = 18v 389.0 411.0 mv v th(f) falling input threshold voltage (note 6) r l = 100k, v o = 2v swing v s = 1.4v 383.5 403.5 mv v s = 5v 384.5 402.5 mv v s = 12v 382.5 404.5 mv v s = 18v 381.5 405.5 mv hys hys = v th(r) ?v th(f) v s = 1.4v, 5v, 12v, 18v, r l = 100k, v o = 2v swing 311mv i b input bias current v s = 1.4v, 18v, v in = v s 15 na v s = 1.4v, v in = 18v 15 na v s = 1.4v, 18v, v in = 0.1v 15 na v ol output low voltage 10mv input overdrive v s = 1.4v, i out = 0.5ma 250 mv v s = 1.6v, i out = 3ma 250 mv v s = 5v, i out = 5ma 250 mv i off output leakage current v s = 1.4v, 18v, v out = v s , v in = 40mv overdrive 1 a v s = 1.4v, v out = 18v, v in = 40mv overdrive 1 a t a = 25 c, unless otherwise specified. electrical characteristics symbol parameter conditions min typ max units v th(r) rising input threshold voltage (note 6) r l = 100k, v o = 2v swing v s = 1.4v 394 400 406 mv v s = 5v 395 400 405 mv v s = 12v 393 400 407 mv v s = 18v 392 400 408 mv v th(f) falling input threshold voltage (note 6) r l = 100k, v o = 2v swing v s = 1.4v 386 393.5 401 mv v s = 5v 387 393.5 400 mv v s = 12v 385 393.5 402 mv v s = 18v 384 393.5 403 mv hys hys = v th(r) ?v th(f) v s = 1.4v, 5v, 12v, 18v, r l = 100k, v o = 2v swing 3.5 6.5 9.5 mv i b input bias current v s = 1.4v, 18v, v in = v s 0.01 10 na v s = 1.4v, v in = 18v 0.01 10 na v s = 1.4v, 18v, v in = 0.1v 4 10 na v ol output low voltage 10mv input overdrive v s = 1.4v, i out = 0.5ma 55 200 mv v s = 1.6v, i out = 3ma 60 200 mv v s = 5v, i out = 5ma 70 200 mv i off output leakage current v s = 1.4v, 18v, v out = v s , v in = 40mv overdrive 0.01 0.8 a v s = 1.4v, v out = 18v, v in = 40mv overdrive 0.01 0.8 a t pd(hl) high-to-low propagation delay v s = 5v, 10mv input overdrive, r l = 10k, 29 s v ol = 400mv t pd(lh) low-to-high propagation delay v s = 5v, 10mv input overdrive, r l = 10k, 18 s v oh = 0.9 ?v s t r output rise time v s = 5v, 10mv input overdrive, r l = 10k 2.2 s v o = (0.1 to 0.9) ?v s t f output fall time v s = 5v, 10mv input overdrive, r l = 10k 0.22 s v o = (0.1 to 0.9) ?v s i s supply current no load current v s = 1.4v 5.7 10.0 a v s = 5v 6.5 11.0 a v s = 12v 6.9 12.5 a v s = 18v 7.1 13.0 a the denotes the specifications which apply over the temperature range of 0 c t a 70 c, unless otherwise specified (notes 4, 5).
lt6700-1/lt6700-2/lt6700-3 4 6700123fd the denotes the specifications which apply over the temperature range of ?0 c t a 85 c, unless otherwise specified (notes 4, 5). symbol parameter conditions min typ max units v th(r) rising input threshold voltage (note 6) r l = 100k, v o = 2v swing v s = 1.4v 390 410 mv v s = 5v 392 408 mv v s = 12v 389 411 mv v s = 18v 388 412 mv v th(f) falling input threshold voltage (note 6) r l = 100k, v o = 2v swing v s = 1.4v 382.5 404.5 mv v s = 5v 383.5 403.5 mv v s = 12v 381.5 405.5 mv v s = 18v 380.5 406.5 mv hys hys = v th(r) ?v th(f) v s = 1.4v, 5v, 12v, 18v, r l = 100k, v o = 2v swing 2 11.5 mv i b input bias current v s = 1.4v, 18v, v in = v s 15 na v s = 1.4v, v in = 18v 15 na v s = 1.4v, 18v, v in = 0.1v 15 na v ol output low voltage 10mv input overdrive v s = 1.4v, i out = 0.1ma 250 mv v s = 1.6v, i out = 3ma 250 mv v s = 5v, i out = 5ma 250 mv i off output leakage current v s = 1.4v, 18v, v out = v s , v in = 40mv overdrive 1 a v s = 1.4v, v out = 18v, v in = 40mv overdrive 1 a i s supply current no load current v s = 1.4v 14.0 a v s = 5v 15.0 a v s = 12v 16.5 a v s = 18v 17.0 a electrical characteristics the denotes the specifications which apply over the temperature range of ?0 c t a 125 c, unless otherwise specified (notes 4, 5). lt6700h symbol parameter conditions min typ max units v th(r) rising input threshold voltage (note 6) r l = 100k, v o = 2v swing v s = 1.4v 390 411 mv v s = 5v 392 410 mv v s = 12v 389 412 mv v s = 18v 388 413 mv v th(f) falling input threshold voltage (note 6) r l = 100k, v o = 2v swing v s = 1.4v 381.5 405.5 mv v s = 5v 382.5 404.5 mv v s = 12v 380.5 406.5 mv v s = 18v 379.5 407.5 mv hys hys = v th(r) ?v th(f) v s = 1.4v, 5v, 12v, 18v, r l = 100k, v o = 2v swing 2 13.5 mv i b input bias current v s = 1.4v, 18v, v in = v s 45 na v s = 1.4v, v in = 18v 45 na v s = 1.4v, 18v, v in = 100mv 50 na v ol output low voltage 10mv input overdrive v s = 1.4v, i out = 0.1ma 250 mv v s = 1.6v, i out = 3ma 250 mv v s = 5v, i out = 5ma 250 mv i off output leakage current v s = 1.4v, 18v, v out = v s , v in = 40mv overdrive 1 a v s = 1.4v, v out = v s , v in = 40mv overdrive 1 a i s supply current no load current v s = 1.4v 13.0 a v s = 5v 14.0 a v s = 12v 15.5 a v s = 18v 16.0 a the denotes the specifications which apply over the temperature range of 0 c t a 70 c, unless otherwise specified (notes 4, 5).
lt6700-1/lt6700-2/lt6700-3 5 6700123fd uu u pi fu ctio s + + comp b comp a 400mv reference outb v s ?nb +ina outa gnd v s lt6700-1 6700123 pf01 outa: open-collector output of comparator section a. this pin provides drive for up to 40ma of load current. off- state voltage may be as high as 18v above gnd, regard- less of v s used. gnd: ground. this pin is also the low side return of the internal 400mv reference. ina: external input for comparator section a. the voltage on this pin can range from 0.3v to 18v with respect to gnd regardless of v s used. the input is noninverting for the lt6700-1 and lt6700-3, and inverting for the lt6700-2. the other section a comparator input is internally connected to the 400mv reference. inb: external input for comparator section b. the voltage on this pin can range from 0.3v to 18v with respect to gnd regardless of v s used. the input is noninverting for the lt6700-3, and inverting for the lt6700-1 and lt6700-2. the other section b comparator input is inter- nally connected to the 400mv reference. v s : comparator core supply voltage. the parts are char- acterized for operation with 1.4v v s 18v with respect to gnd. outb : open-collector output of comparator section b. this pin provides drive for up to 40ma of load current. off- state voltage may be as high as 18v above gnd, regardless of v s used. + + comp b comp a 400mv reference outb v s ?nb ina outa gnd v s lt6700-2 6700123 pf02 + + comp b comp a 400mv reference outb v s +inb +ina outa gnd v s lt6700-3 6700123 pf03 electrical characteristics lt6700h symbol parameter conditions min typ max units i s supply current no load current v s = 1.4v 16.0 a v s = 5v 17.0 a v s = 12v 18.5 a v s = 18v 19.0 a the denotes the specifications which apply over the temperature range of ?0 c t a 125 c, unless otherwise specified (notes 4, 5). 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. note 2: a heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted indefinitely. note 3: the inputs are protected by esd diodes to the ground. if the input voltage exceeds 0.3v below ground, the input current should be limited to less than 10ma. note 4: the lt6700c-1/-2/-3, and lt6700i-1/-2/-3 are guaranteed functional over the operating temperature range of 40 c to 85 c. the lt6700h-1/-2/-3, is guaranteed functional over the operating temperature range of 40 c to 125 c. note 5: the lt6700c-1/-2/-3, is guaranteed to meet the specified performance from 0 c to 70 c. the lt6700c-1/-2/-3 are designed, characterized and expected to meet specified performance from 40 c to 85 c but are not tested or qa sampled at these tempera- tures. the lt6700i-1/-2/-3, is guaranteed to meet specified performance from 40 c to 85 c. the lt6700h-1/-2/-3, is guaranteed to meet specified performance from ?0 c to 125 c. note 6: v th defines the threshold voltage of the comparators and combines the effect of offset and reference accuracy.
lt6700-1/lt6700-2/lt6700-3 6 6700123fd typical perfor a ce characteristics uw distribution of rising input threshold voltage rising input threshold voltage (mv) 394 396 398 400 402 404 406 0 percent of units (%) 2 6 8 10 18 6700123 g01 4 12 14 16 v s = 5v t a = 25 c hysteresis (mv) 4 4.8 5.6 6.4 7.2 8 8.8 0 percent of units (%) 2 6 8 10 6700123 g03 4 12 14 16 18 20 v s = 5v t a = 25 c falling input threshold voltage (mv) 388 390 392 394 396 398 400 0 percent of units (%) 2 6 8 10 6700123 g02 4 12 14 18 16 v s = 5v t a = 25 c distribution of falling input threshold voltage distribution of hysteresis rising input threshold voltage vs temperature rising input threshold voltage vs temperature rising input threshold voltage vs supply voltage temperature ( c) ?0 ?0 rising input threshold voltage (mv) 400 401 402 100 120 6700123 g04 399 398 ?0 0 20406080 397 404 403 396 four typical parts v s = 5v #1 #2 #3 #4 temperature ( c) ?0 ?0 rising input threshold voltage (mv) 401.0 401.5 402.0 100 120 6700123 g05 400.5 400.0 ?0 0 20406080 399.5 403.0 402.5 399.0 v s = 1.4v v s = 5v v s = 12v v s = 18v supply voltage (v) rising input threshold voltage (mv) 401.0 401.5 402.0 6700123 g06 400.5 400.0 24 16 14 18 6 81012 399.5 403.0 402.5 399.0 t a = 25 c t a = 85 c t a = 125 c t a = 55 c hysteresis vs temperature temperature ( c) ?0 ?0 hysteresis (mv) 6 7 8 100 120 6700123 g07 5 4 ?0 0 20406080 3 10 9 2 four typical parts v s = 5v #1 #2 #3 #4 temperature ( c) ?0 ?0 hysteresis (mv) 6 7 8 100 120 6700123 g08 5 4 ?0 0 20406080 3 10 9 2 v s = 1.4v v s = 5v v s = 12v v s = 18v supply voltage (v) hysteresis (mv) 6 7 8 6700123 g09 5 4 24 16 14 18 6 81012 3 10 9 2 t a = 25 c t a = 85 c t a = 125 c t a = 55 c hysteresis vs temperature hysteresis vs supply voltage
lt6700-1/lt6700-2/lt6700-3 7 6700123fd typical perfor a ce characteristics uw minimum supply voltage quiescent supply current vs supply voltage start-up supply current supply current vs output sink current below ground input bias current low level input bias current high level input bias current supply voltage (v) ? threshold shift (mv) ? ? 1 ? ? 0 1.3 1.7 6700123 g10 1.9 1.1 0.9 1.5 t a = 25 c t a = 85 c t a = 125 c t a = 55 c supply voltage (v) 1.4 3.4 supply current ( a) 6 7 8 15.4 13.4 17.4 6700123 g11 5 4 5.4 7.4 9.4 11.4 10 9 t a = 25 c t a = 85 c t a = 125 c t a = 55 c no load current supply voltage (v) 0 supply current ( a) 30 40 50 0.8 6700123 g12 20 10 0 0.2 0.4 0.6 1.0 1.2 1.4 t a = 25 c t a = 85 c t a = 125 c t a = 55 c output sink current (ma) 10 supply current ( a) 100 0.001 0.1 1 10 6700123 g13 1 0.01 1000 100 t a = 40 c v s = 1.4v v s = 5v v s = 12v v s = 18v supply current vs output sink current supply current vs output sink current output sink current (ma) 10 supply current ( a) 100 0.001 0.1 1 10 6700123 g14 1 0.01 1000 100 t a = 25 c v s = 1.4v v s = 5v v s = 12v v s = 18v output sink current (ma) 10 supply current ( a) 100 0.001 0.1 1 10 6700123 g15 1 0.01 1000 100 t a = 85 c v s = 1.4v v s = 5v v s = 12v v s = 18v input voltage (v) 10 input bias current (na) 1000 10000 0.3 0.1 0 6700123 g16 1 0.2 100 t a = 25 c t a = 85 c t a = 125 c t a = 55 c v s = 18v 0.3v < v ib < 0v current is going out of the device input voltage (v) 0 ? input bias current (na) ? ? ? ? 3 0 0.2 0.4 0.5 6700123 g17 ? 1 2 ? 0.1 0.3 0.6 0.7 1 0.9 0.8 t a = 25 c t a = 85 c t a = 125 c t a = 55 c v s = 18v 0v < v ib < 1v current is positive going into the device input voltage (v) 0.01 input bias current (na) 1 10 1357911131517 6700123 g18 0.001 0.1 t a = 25 c t a = 85 c t a = 125 c v s = 18v v ib > 1v current is going into the device
lt6700-1/lt6700-2/lt6700-3 8 6700123fd typical perfor a ce characteristics uw output short-circuit current propagation delay vs input overdrive rise and fall times vs output pull-up resistor noninverting and inverting comparator propagation delay output saturation voltage vs output sink current output sink current (ma) 10 output saturation voltage (mv) 100 0.001 0.1 1 10 6700123 g19 1 0.01 1000 100 t a = 40 c v s = 1.4v v s = 5v v s = 12v v s = 18v output saturation voltage vs output sink current output saturation voltage vs output sink current output sink current (ma) 10 output saturation voltage (mv) 100 0.001 0.1 1 10 6700123 g20 1 0.01 1000 100 t a = 25 c v s = 1.4v v s = 5v v s = 12v v s = 18v output sink current (ma) 10 output saturation voltage (mv) 100 0.001 0.1 1 10 6700123 g21 1 0.01 1000 100 t a = 85 c v s = 1.4v v s = 5v v s = 12v v s = 18v output voltage (v) 0 short-circuit current (ma) 40 50 60 6700123 g22 30 20 24 16 14 18 6 81012 10 80 70 0 t a = 25 c t a = 85 c t a = 125 c t a = 55 c v s = 5v output short-circuit current output leakage current output voltage (v) 0 short-circuit current (ma) 40 50 60 6700123 g23 30 20 24 16 14 18 6 81012 10 80 70 0 t a = 25 c v s = 1.4v v s = 5v v s = 12v v s = 18v output voltage (v) 0.01 output leakage current (na) 0.1 1 10 0 8 10 12 14 16 0.001 246 18 6700123 g24 t a = 25 c t a = 85 c t a = 125 c t a = 55 c v s = 5v input overdrive (mv) 0 propagation delay ( s) 30 40 50 60 80 6700123 g25 20 10 0 20 40 60 100 lh noninv hl noninv lh inv hl inv t a = 25 c output pull-up resistor (k ? ) 0.1 0.01 rise and fall time ( s) 1 100 1 10 100 1000 6700123 g26 0.1 10 v s = 5v c l = 20pf t a = 25 c rise fall v o(ninv) 5v/div dc v o(inv) 5v/div dc v in 10mv/div ac v s = 5v 20 s/div 67000123 g27 t a = 25 c r load = 10k connected to vs v in(overdrive) = 10mv over the input voltage thresholds
lt6700-1/lt6700-2/lt6700-3 9 6700123fd applicatio s i for atio wu uu the lt6700-1/lt6700-2/lt6700-3 devices are a family of dual micropower comparators with a built-in 400mv ref- erence. features include wide supply voltage range (1.4v to 18v), over-the-top input and output range, 2% accu- rate rising input threshold voltage and 6.5mv typical built- in hysteresis. the comparator? open-collector outputs can sink up to 40ma typical. internal reference each of the comparator sections has one input available externally, with the three versions of the part differing by the polarity of those available inputs (i.e., inverting or noninverting). the other comparator inputs are connected internally to the 400mv reference. the rising input thresh- old voltage of the comparators is designed to be equal to that of the reference (i.e., 400mv). the reference voltage is established with respect to the device gnd connection. hysteresis each comparator has built-in 6.5mv (typical) hysteresis to simplify designs, insure stable operation in the presence of noise at the inputs, and to reject supply rail noise that might be induced by state change load transients. the hysteresis is designed such that the falling input threshold voltage is nominally 393.5mv. external positive feedback circuitry can be employed with noninverting comparator inputs to increase effective hysteresis if desired, but such circuitry will provide an apparent effect on both the rising and falling input thresholds (the actual internal thresholds remain unaffected). comparator inputs a comparator input can swing from ground to 18v, regardless of the supply voltage used. the typical input current for inputs well above threshold (i.e., >800mv) is a few pa leaking into an input. with decreasing input voltage, a small bias current begins to be drawn out of the input, reaching a few na when at ground potential. the input may be forced 100mv below ground without causing an improper output, though some additional bias current will begin to flow from the parasitic esd input protection diode. inputs driven further negative than 100mv below ground will not cause comparator malfunction or damage (provided the current is limited to 10ma), but the accuracy of the reference cannot be guaranteed, in which case the output state of the alternate comparator may be effected. comparator outputs the comparator outputs are open collector and capable of sinking 40ma typical. load currents are directed out the gnd pin of the part. the output off-state voltage may range between ?.3v and 18v with respect to ground, regardless of the supply voltage used. as with any open-collector device, the outputs may be tied together to implement wire-and logic functions. power supplies the comparator family core circuitry operates from a single 1.4v to 18v supply. a minimum 0.1 f bypass capacitor is required between the v s pin and gnd. when an output load is connected to the supply rail near the part and the output is sinking more than 5ma, a 1 f bypass capacitor is recommended. in instances where the supply is relatively ?oft?(such as with small batteries) and susceptible to load steps, an additional 47 ? series de- coupling resistor can further improve isolation of supply transients from the v s pin. flexible window comparator using the lt6700-1 as shown in the circuits of figure 1, the wire-and configuration permits high accuracy win- dow functions to be implemented with a simple 3-resistor voltage divider network. the section a comparator pro- vides the v l trip-point and the section b comparator provides the v h trip-point, with the built-in hysteresis providing about 1.7% recovery level at each trip point to prevent output chatter. for designs that are to be optimized to detect departure from a window limit, the nominal resistor divider values are selected as follows (refer to the resistor designators shown on the first circuit of figure 1): r1 400k (this sets the divider current >> i b of inputs) r2 = r1 ?(0.98 ?v h /v l ?1) r3 = r1 ?(2.5 ?v h ?0.98 ?v h /v l )
lt6700-1/lt6700-2/lt6700-3 10 6700123fd to create window functions optimized for detecting entry into a window (i.e. where the output is to indicate a ?oming into spec?condition, as with the examples in figure 1), the nominal resistor values are selected as follows: r1 400k (this sets the divider current >> i b of inputs) r2 = r1 ?(1.02 ?v h /v l ?1) r3 = r1 ?(2.54 ?v h ?1.02 ?v h /v l ) the worst-case variance of the trip-points is related to the specified threshold limits of the lt6700 device and the basic tolerance of divider resistors used. for resistor tolerance r tol (e.g. 0.01 for 1%), the worst-case trip- point voltage (either v h or v l ) deviations can be predicted as follows (italicized values are taken from the datasheet, expressed in volts): max dev v trip = v tripnom ?{2 ?r tol ?[(v tripnom ?0.4) / v tripnom ] + 1.25 ?( v th(r)max ? v th(r)min )} max dev v trip = v tripnom ?{2 ?r tol ?[(v tripnom ?0.39) / v tripnom ] + 1.27 ?( v th(f)max ? v th(f)min )} generating an external reference signal in some applications, it would be advantageous to have access to a signal that is directly related to the internal 400mv reference, even though the reference itself is not available externally. this can be accomplished to a reason- able degree by using an inverting comparator section as a ?ang-bang?servo, establishing a nominal voltage, on an integration capacitor, that is scaled to the reference. this method is used in figure 2, where the reference level has been doubled to drive a resistor bridge. the section b output cycles on and off to swing the section b input between its hysteresis trip points as the load capacitor applicatio s i for atio wu uu figure 1. simple window comparator charges and discharges in a shallow, controlled fashion. the multiplied reference signal also contains ripple that is the hysteresis multiplied by the same factor, so additional filtering is performed at the sense node of the bridge to prevent comparator chatter in the section a comparator, which is performing the actual conditional decision for the circuit. instrumentation grade pulse width modulator (pwm) comparators with hysteresis are frequently employed to make simple oscillator structures, and the lt6700 lends itself nicely to forming a charge-balancing pwm function. the circuit shown in figure 3 forms a pwm that is intended to transmit an isolated representation of a voltage differ- ence, rather like an isolated instrumentation amplifier. the section b comparator is used to generate a 2v reference supply level for the cmos not gate (inverter), which serves as the precision switch element for the charge balancer. the heart of the charge balancer is the section a comparator, which is detecting slight charge or discharge lt6700-1 v s gnd r3 301k r2 6.04k 33k +ina ?nb outb outa v out v s v l v h 3.3v 3.3v supply monitor 5v supply monitor r1 40.2k 0.1 f v out high = (3.1v < v s < 3.5v) hysteresis zones approximately 2% of trip voltage lt6700-1 v s gnd 487k 6.04k 33k +ina ?nb outb outa 5v 40.2k 0.1 f v out high = (4.7v < v s < 5.3v) 6700123 f01 lt6700-1 v s 10k gnd +ina inb outb outa 499k r th t r th = 1m (e.g., ysi 44015, 1.00m ? at 25 c) r set = r th at t set *resistance may require optimization for operation over intended r th and v supply ranges hysteresis zone 0.4 c r set 2 ?v ref 499k 220k 220k* 3.3 f 3.3 f 1.4v to 18v (i s 10 a) 0.1 f t < t set 6700123 f02 figure 2. micropower thermostat/temperature alarm
lt6700-1/lt6700-2/lt6700-3 11 6700123fd lt6700-1 v s 10k gnd +ina inb outb outa 100k* 100k* 0.22 f ?? + 412k* 10k** 470 ? lithium coin cell 10k 10k 750 ? 10k 750** ? 3v/5v 3v/5v ? sample in moc-207 moc-207** pwm out (or ? sense) 2 1 5 6 5 6 2 1 0.1 f 0.1 f 3v nom (i s < 3ma) 5 ?v ref = 2v 6700123 f03 22 f 1% metal film delete for pwm mode connect for pwm mode optimized for 2khz ? sampling, f pwm(max) 0.6khz * ** ? ?? 309k* nc7s14 309k* v in 0v to 2v + figure 3. isolated pwm or ? converter 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. applicatio s i for atio wu uu states on the 0.22 f ?ntegration?capacitor as it remains balanced at 400mv by feedback through the not gate. the input sense voltage, v in , is converted to an imbalance current that the not gate duty cycle is continually correct- ing for, thus the digital waveform at the section a com- parator output is a pwm representation of v in with respect to the 2v ?ull scale.?in this particular circuit, the pwm information drives the led of an optocoupler, allowing the v in information to be coupled across a dielectric barrier. as an additional option to the circuit, the feedback loop can be broken and a second optocoupler employed to provide the charge balance management. this configuration al- lows for clocking the comparator output (externally to this circuit) and providing synchronous feedback such that a simple ? voltage-to-frequency conversion can be formed if desired. approximately 11-bit accuracy and noise per- formance was observed in a one second integration period for duty factors from 1% to 99%. u package descriptio 3.00 0.10 (2 sides) 2.00 0.10 (2 sides) note: 1. drawing to be made a jedec package outline m0-229 variation of (tbd) 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 view?xposed pad 1.65 0.10 (2 sides) 0.75 0.05 r = 0.115 typ r = 0.05 typ 1.35 0.10 (2 sides) 1 3 6 4 pin 1 bar top mark (see note 6) 0.200 ref 0.00 ?0.05 (dcb6) dfn 0405 0.25 0.05 0.50 bsc pin 1 notch r0.20 or 0.25 45 chamfer 0.25 0.05 1.35 0.05 (2 sides) recommended solder pad pitch and dimensions 1.65 0.05 (2 sides) 2.15 0.05 0.70 0.05 3.55 0.05 package outline 0.50 bsc dcb package 6-lead plastic dfn (2mm 3mm) (reference ltc dwg # 05-08-1715)
lt6700-1/lt6700-2/lt6700-3 12 6700123fd linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2003 lt 0207 rev d ? printed in usa part number description comments lt1017/lt1018 micropower dual comparator 1.1v (min) supply voltage, 1.4mv (max) input offset ltc1441/ltc1442 micropower dual comparator with 1% reference 1.182 1% reference, 10mv (max) input offset ltc1998 micropower comparator for battery monitoring 2.5 a typ supply current, adjustable threshold and hysteresis related parts powerpath tm controller lt6700-3 v s gnd +ina +inb outb outa 1k r1 249k r2 150k r1 = 400k/(v batt at low ?0.4) r2 = 400k/(v batt at max ?0.4) hysteresis zones approximately 2% of trip voltage powerpath is a trademark of linear technology corporation 1m 1m si2301ds b0520lw 100k v supply 1.6v min 3v nom v wart > 3.1v v batt > 2v 1 f 6700123 ta04 10k ?art?input 3.3v nom alkaline aa cells + + typical applicatio s u 48v status monitor 1.74m 7.87k v in 27k 33k moc-207 6700123 ta03 v out low = (39v < v in < 70v) 3v/5v 16 25 33k v in hysteresis zones approximately 2% of trip voltage v out led off led on v l v h 10k 5.1v cmpz5231b 22v cmpz5251b 0.1 f + lt6700-1 v s gnd +ina ?nb outb outa 1.50 ?1.75 (note 4) 2.80 bsc 0.30 ?0.45 6 plcs (note 3) datum ? 0.09 ?0.20 (note 3) s6 tsot-23 0302 2.90 bsc (note 4) 0.95 bsc 1.90 bsc 0.80 ?0.90 1.00 max 0.01 ?0.10 0.20 bsc 0.30 ?0.50 ref pin one id note: 1. dimensions are in millimeters 2. drawing not to scale 3. dimensions are inclusive of plating 4. dimensions are exclusive of mold flash and metal burr 5. mold flash shall not exceed 0.254mm 6. jedec package reference is mo-193 3.85 max 0.62 max 0.95 ref recommended solder pad layout per ipc calculator 1.4 min 2.62 ref 1.22 ref u package descriptio s6 package 6-lead plastic tsot-23 (reference ltc dwg # 05-08-1636)

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