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lt1431 1 1431fe typical a pplica t ion fea t ures descrip t ion programmable reference the lt ? 1431 is an adjustable shunt voltage regulator with 100ma sink capability, 0.4% initial reference voltage tolerance and 0.3% typical temperature stability. on-chip divider resistors allow the lt1431 to be configured as a 5v shunt regulator, with 1% initial voltage tolerance and requiring no additional external components. by adding two external resistors, the output voltage may be set to any value between 2.5v and 36v. the nominal internal current limit of 100ma may be decreased by including one external resistor. a simplified 3-pin version, the lt1431cz/lt1431iz, is available for applications as an adjustable reference and is pin compatible with the tl431. isolated 5v regulator a pplica t ions n guaranteed 0.4% initial voltage t olerance n 0.1 typical dynamic output impedance n fast turn-on n sink current capability, 1ma to 100ma n low reference pin current n available in j8, n8, s8 or 3-lead to-92 z packages n linear regulators n adjustable power supplies n switching power supplies v ref vs temperature lt1431 ta01 coll comp v + 5v lt1431 gnd-f gnd-s r top ref r mid 2.5v + ? g m = 4ma/v + switching regulator ? v in 5v + temperature (c) ?50 v ref (v) 2.4975 2.5000 2.5025 25 75 lt1431 ta01b 2.4950 2.4925 ?25 0 50 100 125 2.4900 2.4875 l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks and thinsot is a trademark of linear technology corporation. all other trademarks are the property of their respective owners.
lt1431 2 1431fe a bsolu t e maxi m u m r a t ings v + , v collector .......................................................... 36v v comp , r top , r mid , v ref ............................................. 6v gn d-f to gnd-s ...................................................... 0 .7v ambient temperature range lt1431m, lt1431mp ......................... C5 5c to 125c lt1431i ................................................ C 40c to 85c lt1431c .................................................. 0 c to 70c (note 1) p in c on f igura t ion o r d er i n f or m a t ion lead free finish tape and reel part marking package description temperature range lt1431cn8#pbf lt1431cn8#trpbf lt1431 cn8 8-lead plastic dip 0c to 70c lt1431in8#pbf lt1431in8#trpbf lt1431 in8 8-lead plastic dip C40c to 85c lt1431cs8#pbf lt1431cs8#trpbf lt1431 8-lead plastic so 0c to 70c lt1431is8#pbf lt1431is8#trpbf lt1431i 8-lead plastic so C40c to 85c lt1431mps8#pbf lt1431mps8#trpbf lt1431 8-lead plastic so C55c to 125c lt1431mj8#pbf lt1431mj8#trpbf lt1431 mj8 8-lead cerdip C55c to 125c lt1431cz#pbf lt1431cz#trpbf lt1431 cz 3-lead to-92 plastic 0c to 70c lt1431iz#pbf lt1431iz#trpbf lt1431 iz 3-lead to-92 plastic C40c to 85c consult ltc marketing for parts specified with wider operating temperature ranges. consult ltc marketing for information on non-standard 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/ junction temperature range lt1431m, lt1431mp ......................... C5 5c to 150c lt1431i .............................................. C 40c to 100c lt1431c ................................................. 0 c to 100c storage temperature range .................. C 65c to 150c lead temperature (soldering, 10 sec) ................... 3 00c 1 2 3 4 8 7 6 5 top view collector comp v + r top ref r mid gnd-f gnd-s j8 package 8-lead cerdip t jmax = 150c, ja = 100c/w 1 2 3 4 8 7 6 5 top view collector comp v + r top ref r mid gnd-f gnd-s n8 package 8-lead plastic dip t jmax = 100c, ja = 130c/w 1 2 3 4 8 7 6 5 top view ref r mid gnd-f gnd-s collector comp v + r top s8 package 8-lead plastic so t jmax = 100c, ja = 170c/w bottom view ref anode cathode z package 3-lead to-92 plastic t jmax = 100c, ja = 150c/w
lt1431 3 1431fe e lec t rical c harac t eris t ics 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: v ka is the cathode voltage of the lt1431cz/iz and corresponds to v + of the lt1431cn8/in8/cs8/is8. i k is the cathode current of the the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. i k = 10ma unless otherwise specified (note 2) symbol parameter conditions lt1431i, lt1431m lt1431c units min typ max min typ max v ref reference voltage v ka = 5v, i k = 2ma, (note 3) l 2.490 2.465 2.500 2.510 2.535 2.490 2.480 2.500 2.510 2.520 v v ?v ref /?t reference drift v ka = 5v, i k = 2ma l 50 30 ppm/c ?v ref /?v ka voltage ratio, reference to cathode (open-loop gain) i k = 2ma, v ka = 3v to 36v l 0.2 0.5 0.2 0.5 mv/v |i ref | reference input current v ka = 5v, t a = 25c l 0.2 1.0 1.5 0.2 1.0 1.2 a a i min minimum operating current v ka = v ref to 36v 0.6 1.0 0.6 1.0 ma |i off | off-state cathode current v ka = 36v, v ref = 0v l 1 15 1 2 a a |i leak | off-state collector leakage current v coll = 36v, v + = 5v, v ref = 2.4v l 1 5 1 2 a a |z ka | dynamic impedance v ka = v ref , i k = 1ma to 100ma, f 1khz 0.2 0.2 i lim collector current limit v ka = v ref + 50mv l 80 360 100 260 ma 5v reference output internal divider used, i k = 2ma 4.950 5.000 5.050 4.950 5.000 5.050 v lt1431cz/iz and corresponds to i(v + ) + i collector of the lt1431cn8/ in8/cs8/is8. note 3: the lt1431 has bias current cancellation which is effective only for v ka 3v. a slight (2mv) shift in reference voltage occurs when v ka drops below 3v. for this reason, these tests are not performed at v ka = v ref .
lt1431 4 1431fe typical p er f or m ance c harac t eris t ics v ref and i ref vs temperature i limit vs temperature with external resistor collector v s at vs temperature vs current propagation delay vs overdrive voltage gain and phase vs frequency transconductance and phase vs frequency (ref to coll) 2.5v reference i k vs v ka v ref and i ref vs v + v ref and i ref vs v + v ka (v) 0 i k (a) 600 800 1000 4.0 lt1431 tpc01 400 200 0 1.0 2.0 3.0 5.0 i min 500 700 900 300 100 0.5 4.5 1.5 2.5 3.5 v + (v) 2.5 v ref (v) 2.501 2.503 2.505 3.3 lt1431 tpc02 2.499 2.497 2.495 2.7 2.9 3.1 3.5 i ref (a) 1.5 2.5 3.5 0.5 ?0.5 ?1.5 v ref i ref 2.500 2.502 2.504 2.498 2.496 3.2 2.6 2.8 3.0 3.4 1.0 2.0 3.0 0 ?1.0 v + (v) 0 v ref (v) 2.501 2.503 2.505 32 lt1431 tpc03 2.499 2.497 2.495 8 16 24 40 i ref (a) 1.5 2.5 3.5 0.5 ?0.5 ?1.5 v ref i ref 2.500 2.502 2.504 2.498 2.496 28 4 12 20 36 1.0 2.0 3.0 0 ?1.0 temperature (c) ?50 v ref (v) 2.4975 2.5000 2.5025 25 75 lt1431 tpc04 2.4950 2.4925 ?25 0 50 100 125 2.4900 2.4875 0.33 0.66 1.00 0 ?0.33 ?0.66 ?1.00 i ref (a) v ref i ref temperature (c) ?50 i limit (normalized) 1.000 1.125 1.250 25 75 lt1431 tpc05 0.875 0.750 ?25 0 50 100 125 0.625 0.500 i limit = 0.7 r lim + 3.6 at 25c temperature (c) ?50 v sat (v) 0.80 1.00 1.20 25 75 lt1431 tpc06 0.60 0.40 ?25 0 50 100 125 0.20 0 i coll = 100ma i coll = 20ma i coll = 10ma i coll = 50ma overdrive (mv) 0 propagation delay (s) 90 120 150 200 lt1431 tpc07 60 30 0 50 100 150 250 75 105 135 45 15 3 1 1k output 5 6 5v lt1431 v ref overdrive output high-to-low output low-to-high frequency (hz) 20 ref-to-coll 1k load a v (db) 40 80 120 140 100 10k 100k 10m lt1431 tpc08 0 1k 1m 100 60 ?20 ?90 ?45 45 135 180 ?135 90 0 ?180 phase (deg) phase a v frequency (hz) 10 10 100 10k 100k 10m lt1431 tpc09 1k 1m ?90 ?45 45 135 180 ?135 90 0 ?180 phase (deg) 10 9 10 8 10 7 10 6 10 5 10 4 10 3 10 2 ref-to-coll g m ( ) phase g m
lt1431 5 1431fe typical p er f or m ance c harac t eris t ics i comp vs v comp vs v ref noise vs frequency 0.1hz to 10hz noise transconductance and phase vs frequency (ref to comp) dynamic impedance vs frequency v comp vs temperature vs i coll frequency (hz) 10 4 100 10k 100k 10m lt1431 tpc10 1k 1m ?100 ?80 ?40 0 20 ?120 ?20 ?60 ?140 phase (deg) 3 10 3 10 3 0.1 ref-to-coll g m ( ) phase g m 3 10 2 frequency (hz) 100 0.8 1.0 1.2 1.4 1k 10k 100k lt1431 tpc11 0.6 0.4 0.2 0 i k 100ma z ka () temperature (c) ?50 v comp (v) 2.0 2.5 3.0 25 75 lt1431 tpc12 1.5 1.0 ?25 0 50 100 125 0.5 0 i coll = 100ma i coll = 10ma v comp (v) 0 i comp (a) 400 500 600 1.5 2.5 lt1431 tpc13 300 200 0.5 1.0 2.0 3.0 3.5 100 0 v ref = 5v v ref = 4v v ref = 3v v ref = 2.53v frequency (hz) noise (nv/hz) 1000 1 100 1k 100k lt1431 g14 10 10k 500 0 time (minutes) 0 3 5 lt1431 tpc15 1 2 4 6 noise voltage (50v/div)
lt1431 6 1431fe b lock diagra m p in func t ions coll (pin 1): open collector of the output transistor. the maximum pin voltage is 36v. the saturation voltage at 100ma is approximately 1v. comp (pin 2): base of the driver for the output transis - tor. this pin allows additional compensation for complex feedback systems and shutdown of the regulator. it must be left open if unused. v + (pin 3): bias voltage for the entire shunt regulator. the maximum input voltage is 36v and the minimum to operate is equal to v ref (2.5v). the quiescent current is typically 0.6ma. r top (pin 4): top of the on-chip 5k-5k resistive divider that guarantees 1% accuracy of operation as a 5v shunt regulator with no external trim. the pin is tied to coll for self-contained 5v operation. it may be left open if unused. see note on parasitic diodes below. gnd-s (pin 5): ground reference for the on-chip resis- tive divider and shunt regulator circuitry except for the output transistor. this pin allows external current limit of the output transistor with one resistor between gnd-f (force) and gnd-s (sense). gnd-f (pin 6): emitter of the output transistor and sub- strate connection for the die. r mid (pin 7): middle of the on-chip resistive divider string between r top and gnd-s. the pin is tied to ref for self- contained 5v operation. it may be left open if unused. ref (pin 8): control pin of the shunt regulator with a 2.5v threshold. if v + > 3v, input bias current cancellation reduces i b to 0.2a typical. comp, r top , r mid , and ref have static discharge protection circuits that must not be activated on a continuous basis. therefore, the absolute maximum dc voltage on these pins is 6v, well beyond the normal operating conditions. as with all bipolar ics, the lt1431 contains parasitic diodes which must not be forward biased or else anomalous behavior will result. pin conditions to be avoided are r top below r mid in voltage and any pin below gnd-f in voltage (except for gnd-s). the following pin definitions apply to the z package. cathode: corresponds to coll and v + tied together. anode: corresponds to gnd-s and gnd-f tied together. ref: corresponds to ref. lt1431 bd comp v + gnd-force gnd-sense r top ref r mid 2.5v + ? g m = 4ma/v 5k collector 8 7 5 4 3 2 1 6 5k
lt1431 7 1431fe a pplica t ions i n f or m a t ion typical a pplica t ions frequency compensation as a shunt regulator, the lt1431 is stable for all capacitive loads on the coll pin. capacitive loading between 0.01f and 18f causes reduced phase margin with some ringing under transient conditions. output capacitors should not be used arbitrarily because output noise is not necessar - ily reduced. excess capacitance on the ref pin can introduce enough phase shift to induce oscillation when configured as a reference >2.5v. this can be compensated with capacitance between coll and ref (phase lead). more complicated feedback loops may require shaping of the frequency response of the lt1431 with dominant pole or pole-zero compensation. this can be accomplished with a capacitor or series resistor and capacitor between coll and comp. the compensation schemes mentioned above use voltage feedback to stabilize the circuits. there must be voltage gain at the coll pin for them to be effective, so the coll pin must see a reasonable ac impedance. capacitive loading of the coll pin reduces the ac impedance, voltage gain, and frequency response, thereby decreasing the effective - ness of the compensation schemes, but also decreasing their necessity. 2.5v reference 3-pin package 2.5v reference 8-pin package 5v reference increasing 5v reference programmable reference with adjustable current limit v in r l 2.5v lt1431 ta02 cathode ref lt1431z anode v in r l 2.5v lt1431 ta03 coll ref lt1431 gnd-f v + gnd-s v in r l 5v lt1431 ta04 coll ref lt1431 gnd-f v + gnd-s r top r mid v in r l 5v + ? lt1431 ta05 r ? = r ? (0.5ma) 25% process tolerance ? 500mv coll ref lt1431 gnd-f v + gnd-s r top r mid v in r l lt1431 ta06 r lim v out = ( ) 1 + r1 r2 v ref r1 r2 i limit = 0.7 r lim + 3.6 at 25c coll ref lt1431 gnd-f v + gnd-s
lt1431 8 1431fe typical a pplica t ions pnp low dropout 5v regulator* fet low dropout 5v regulator with current limit 0.015f 150 lt1431 ta07 coll ref lt1431 gnd-f comp gnd-s v + r mid r top 2 1 5 6 8 7 20** 2w 47 1k 5v 330f 0.1f v in 3 4 measured dropout voltage 420mv at 4a 190mv at 2a 95mv at 1a 60mv at 0.5a *no short-circuit protection **may be increased at lower wattage for lower output currents + mje2955 2n2219 1.5k lt1431 ? ta08 8 7 3 4 5 6 1 coll ref lt1431 gnd-f gnd-s v + r mid r top 1n4148 7 6 lt1006 2 3 ? + 4 5 0.002* 47f mtp50n05el mtm25n05l d s g v in 5.2v 47f 5v, 2.5a 12v i load 2a 1a 0.5a mtp50n05el 47mv 22mv 11.5mv mtm25n05l 145mv 73mv 37mv *1.5" #23 solid copper wire ~0.002 3a limit measured dropout voltages + + lt1006
lt1431 9 1431fe typical a pplica t ions isolated 5v to 15v flyback converter fully loaded output ripple vs filtering 12v to 5v buck converter with foldback current limit* buck converter efficiency 2 coll ref gnd-f comp gnd-s v + r mid r top 1 1500pf 5 6 8 7 3 4 5k v in v out gnd logic in v in lt1089 hi-side switch mbr735 100 0.5w pulse engineering #pe-51515 5v, 7a 3300f *contact ltc for high efficiency switching regulators lt1431 ta09 lt1431 + i load (a) 0 efficiency (%) 60 70 80 3 5 8 lt1431 ta10 50 40 30 1 2 4 6 7 v in = 9v v in = 12v v in = 15v 3 5 6 8 1 2 v + ref gnd-f gnd-s coll comp 2.4k 0.1f 20k 13.3k 2.7k v out v c gnd v in lt1172 or lt1072 1.5k 0.68f 3k 0.47f 50f 4.5v to 5.5v mur105 4, 5 ? 6, 7 ? 2 10 ? 9 mur105 c* 15k mur105 c* ?15v, 70ma 15v, 70ma coiltronics ctx02-11934 measured efficiency lt1172 67.8% at 2.2w out lt1072 68.6% at 2.2w out lt1071 61.1% at 4.4w out lt1431 ta11 1 lt1431 + + + 4n36 210f 100f 100f c* lt1172 30mv p-p lt1072 40mv p-p 6mv p-p 8mv p-p l* *l bell industries j.w. miller division 9310-36 10h, 450ma lt1431 ta12 + + +
lt1431 10 1431fe typical a pplica t ions 5v power supply monitor with 500mv window and 50mv hysteresis transfer function high efficiency buck converter e = 85% to 89% coll ref gnd-f v + gnd-s 10** ?high? for over voltage or under voltage 5k 1n4148 coll ref gnd-f v + gnd-s 10** 5k 4k* 1k 6k* 1k *determines window size v = (r ? 5k)(0.5ma) **sets hysteresis lt1431 ta13 lt1431 lt1431 v in 0 0 v out 1 2 3 4 6 1 2 3 4 lt1431 ta14 5 6 5 coll 1 2 6 5 ref r mid 3 q3 2n3904 4 8 7 v + r top r8* 24.9k comp gnd-f gnd-s lt1431cn8 + + + r2 1k c3 0.1f c5 0.047f c4 0.033f r6* 23.7k 5v 2.5a c6 470f 16v 0.12 esr r7* 24.9k 1431 ta15 q2 2n3904 d2 bat85 d4 bat85 r1 470k c2 4.7f 35v tant l1 50h 3a r5 680 q1 vn2222ll run = 0 shutdown > 3v r4 100 r3 10k notes: unless otherwise specified 1. all resistances are in , 0.25w, 5% 2. all capacitances are in f, 50v, 10% 3. shutdown logic state must be defined by a logic gate or by tying to gnd 1 2 rtn off 1 v in d1 bat85 c1 220f 35v d3 mbr330 bold lines indicate high current paths *1% film resistors c1: nichicon upl1v221mph c3, c4, c5: wima mks-2 c6: nichicon upl1c471mph6 d1, d2: philips bat85 d3: motorola mbr330 l1: coiltronics ctx50-3-mp lt1170 v in v c gnd v sw fb 3 1 2 4 5
lt1431 11 1431fe s che m a t ic diagra m p ackage descrip t ion q9 r1 35k r2 35k q5 q1 q2 8 ref 4 r top 7 r mid 5 gnd-sense r4 5k r3 5k r5 5k r8 600 r21 100k r10 340 r14 11 r18 50k r19 3.6 q7 q13 q6 r6 8.5k q17 comp 2 collector 1 q14 q4 c1 22pf r12 1k c2 65pf r13 6.5k r11 11k 10x q15 q16 q21 2.5x 6 gnd-force c4 1pf r17 1.5k r15 5k 2x r20 5k 45x c3 6pf lt1431 sd01 v + 3 r9 2.5k r7 2.5k q22 q20 q8 2x 5x 4x 3x r16 11 q3 q11 q12 q10 q18 q19 j8 package 8-lead cerdip (narrow .300 inch, hermetic) (reference ltc dwg # 05-08-1110) j8 0801 .014 ? .026 (0.360 ? 0.660) .200 (5.080) max .015 ? .060 (0.381 ? 1.524) .125 3.175 min .100 (2.54) bsc .300 bsc (7.62 bsc) .008 ? .018 (0.203 ? 0.457) 0 ? 15 .045 ? .065 (1.143 ? 1.651) .045 ? .068 (1.143 ? 1.650) full lead option .023 ? .045 (0.584 ? 1.143) half lead option corner leads option (4 plcs) .005 (0.127) min .405 (10.287) max .220 ? .310 (5.588 ? 7.874) 1 2 3 4 8 7 6 5 .025 (0.635) rad typ note: lead dimensions apply to solder dip/plate or tin plate leads
lt1431 12 1431fe n8 1002 .065 (1.651) typ .045 ? .065 (1.143 ? 1.651) .130 .005 (3.302 0.127) .020 (0.508) min .018 .003 (0.457 0.076) .120 (3.048) min .008 ? .015 (0.203 ? 0.381) .300 ? .325 (7.620 ? 8.255) .325 +.035 ?.015 +0.889 ?0.381 8.255 () 12 3 4 87 6 5 .255 .015* (6.477 0.381) .400* (10.160) max 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 p ackage descrip t ion .016 ? .050 (0.406 ? 1.270) .010 ? .020 (0.254 ? 0.508) 45 0? 8 typ .008 ? .010 (0.203 ? 0.254) so8 0303 .053 ? .069 (1.346 ? 1.752) .014 ? .019 (0.355 ? 0.483) typ .004 ? .010 (0.101 ? 0.254) .050 (1.270) bsc 1 2 3 4 .150 ? .157 (3.810 ? 3.988) note 3 8 7 6 5 .189 ? .197 (4.801 ? 5.004) note 3 .228 ? .244 (5.791 ? 6.197) .245 min .160 .005 recommended solder pad layout .045 .005 .050 bsc .030 .005 typ inches (millimeters) note: 1. dimensions in 2. drawing not to scale 3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm) n8 package 8-lead pdip (narrow .300 inch) (reference ltc dwg # 05-08-1510) s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610)
lt1431 13 1431fe 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. r evision h is t ory rev date description page number d 4/10 m-grade parts re-released. obsolete package shading removed. 2, 11 e 7/11 added lt1431mps8 to data sheet. changes reflected throughout. 1 to 14 (revision history begins at rev d)
lt1431 14 1431fe linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com linear technology corporation 1992 lt 0711 rev e ? printed in usa r ela t e d p ar t s z package 3-lead plastic to-92 (similar to to-226) (reference ltc dwg # 05-08-1410 rev c) p ackage descrip t ion .050 (1.27) bsc .060 .005 (1.524 0.127) dia .90 (2.286) nom .180 .005 (4.572 0.127) .180 .005 (4.572 0.127) .500 (12.70) min .050 (1.270) max uncontrolled lead dimension .016 .003 (0.406 0.076) 5 nom bulk pack .015 .002 (0.381 0.051) .060 .010 (1.524 0.254) 10 nom .140 .010 (3.556 0.127) z3 (to-92) 1008 rev c 3 2 1 .098 +.016/?.04 (2.5 +0.4/?0.1) 2 plcs to-92 tape and reel refer to tape and reel section of ltc data book for additional information part number description comments lt4430 secondary-side optocoupler driver with reference voltage overshoot control prevents output overshoot during start-up and short-circuit recovery lt3757/lt3758 boost, flyback, sepic and inverting controller 2.9v/5.5v v in 40v/100v, 100khz to 1mhz fixed frequency, 3mm w 3mm dfn-10 and msop-10e packages ltc3803/ltc3803-3/ ltc3803-5 flyback dc/dc controller with fixed 200khz or 300khz operating frequency v in and v out limited by external components, 6-pin thinsot? package ltc3873/ltc3873-5 no r sense constant frequency flyback, boost, sepic controller v in and v out limited only by external components, 8-pin thinsot and 2mm w 3mm dfn-8 packages ltc3805/ltc3805-5 adjustable constant frequency (70khz to 700khz) frequency flyback dc/dc controller v in and v out limited by external components, msop-10e and 3mm w 3mm dfn-10 packages lt1952/lt1952-1 isolated synchronous forward controllers ideal for medium power 24v and 48v input applications ltc3723-1/ltc3723-2 synchronous push-pull and full-bridge controllers high efficiency with on-chip mosfet drivers ltc3721-1/ltc3721-2 non-synchronous push-pull and full-bridge controllers minimizes external components, on-chip mosfet drivers ltc3722/ltc3722-2 synchronous isolated full bridge controllers ideal for high power 24v and 48v input applications

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