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lt1782 1 1782fc typical application description micropower, over-the-top sot-23, rail-to-rail input and output op amp the lt ? 1782 is a 200khz op amp available in the small sot-23 package that operates on all single and split sup - plies with a total voltage of 2.5v to 18v. the amplifer draws less than 55a of quiescent current and has reverse battery protection, drawing negligible current for reverse supply voltages up to 18v. the input range of the lt1782 includes ground, and a unique feature of this device is its over-the-top? opera - tion capability with either or both of its inputs above the positive rail. the inputs handle 18v both differential and common mode, independent of supply voltage. the input stage incorporates phase reversal protection to prevent false outputs from occurring even when the inputs are 9v below the negative supply. the lt1782 can drive loads up to 18ma and still maintain rail-to-rail capability. a shutdown feature on the 6-lead version can disable the part, making the output high impedance and reducing quiescent current to 5a. the lt1782 op amp is available in the 5- and 6-lead sot-23 packages. for applications requiring higher speed, refer to the lt1783. positive supply rail current sense features applications n operates with inputs above v + n rail-to-rail input and output n micropower: 55a supply current max n operating temperature range: C40c to 125c n low profle (1mm) thinsot? package n low input offset voltage: 800v max n single supply input range: 0v to 18v n high output current: 18ma min n specifed on 3v, 5v and 5v supplies n output shutdown on 6-lead version n reverse battery protection to 18v n high voltage gain: 1500v/mv n gain bandwidth product: 200khz n slew rate: 0.07v/s n portable instrumentation n battery- or solar-powered systems n sensor conditioning n supply current sensing n battery monitoring n mux amplifers n 4ma to 20ma transmitters l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks and thinsot and over-the-top are trademarks of linear technology corporation. all other trademarks are the property of their respective owners. distribution of input offset voltage ? + lt1782 i load v out = 2(i load ) 0v to 4.3v 2k 200 1782 ta01a 5v v + 5v to 18v 200 0.2 load mmbt3904 ?900 ?600 ?300 0 300 600 900 percentage of amplifiers input offset voltage (v) 1782 ta01b 25 20 15 10 5 0 v s = 5v, 0v v cm = 2.5v
lt1782 2 1782fc absolute maximum ratings total supply voltage (v + to v C ) ................................ 18v input differential voltage .......................................... 18v input pin voltage to v C ................................ + 24v/C10v shutdown pin voltage above v C ............................. 18v shutdown pin current ........................................ 10ma output short-circuit duration (note 2) ........... indefnite operating temperature range (note 3) lt1782c ............................................... C40c to 85c lt1782i ................................................ C40c to 85c lt1782h ............................................ C40c to 125c (note 1) 4 5 3 1 out v ? +in v + ?in top view s5 package 5-lead plastic tsot-23 2 + ? t jmax = 150c, ja = 250c/w 1 2 3 6 5 4 top view s6 package 6-lead plastic tsot-23 out v ? +in v + shdn ?in + ? t jmax = 150c, ja = 230c/w pin configuration order information lead free finish tape and reel part marking package description specified temperature range lt1782cs5#pbf lt1782cs5#trpbf ltld 5-lead plastic tsot-23 0c to 70c lt1782is5#pbf lt1782is5#trpbf ltle 5-lead plastic tsot-23 C40c to 85c lt1782hs5#pbf lt1782hs5#trpbf ltxk 5-lead plastic tsot-23 C40c to 125c lt1782cs6#pbf lt1782cs6#trpbf ltis 6-lead plastic tsot-23 0c to 70c lt1782is6#pbf lt1782is6#trpbf ltit 6-lead plastic tsot-23 C40c to 85c lt1782hs6#pbf lt1782hs6#trpbf ltxl 6-lead plastic tsot-23 C40c to 125c consult ltc marketing for parts specifed with wider operating temperature ranges. consult ltc marketing for information on non-standard lead based fnish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifcations, go to: http://www.linear.com/tapeandreel/ specifed temperature range (note 4) lt1782c ............................................... C40c to 85c lt1782i ................................................ C40c to 85c lt1782h ............................................ C40c to 125c junction temperature........................................... 150c storage temperature range ................... C65c to 150c lead temperature (soldering, 10 sec) .................. 300c
lt1782 3 1782fc electrical characteristics the l denotes the specifcations which apply over the full operating temperature range, otherwise specifcations are at t a = 25c. v s = 3v, 0v; v s = 5v, 0v, v cm = v out = half supply, for the 6-lead part v pin5 = 0v, pulse power tested unless otherwise specifed. symbol parameter conditions lt1782c/lt1782i units min typ max v os input offset voltage t a = 25c 0c t a 70c C40c t a 85c l l 400 800 950 1100 v v v ?v os /?t input offset voltage drift (note 7) l 2 5 v/c i os input offset current v cm = 18v (note 5) l l 0.7 2 1 na a i b input bias current v cm = 18 (note 5) shdn or v s = 0v, v cm = 0v to 18v l l 8 6 0.1 15 12 na a na input bias current drift C40c t a 85c l 0.01 na/c input noise voltage 0.1hz to 10hz 1 v p-p e n input noise voltage density f = 1khz 50 nv/ hz i n input noise current density f = 1khz 0.05 pa/hz r in input resistance differential common mode, v cm = 0v to (v cc C 1v) common mode, v cm = 0v to 18v l l 3.4 1.5 6.5 5 3 m? g? m? c in input capacitance 5 pf input voltage range l 0 18 v cmrr common mode rejection ratio (note 5) v cm = 0v to v cc C 1v v cm = 0v to 18v (note 8) l l 90 68 100 80 db db psrr power supply rejection ratio v s = 3v to 12.5v, v cm = v o = 1v l 90 100 db a vol large-signal voltage gain v s = 3v, v o = 500mv to 2.5v, r l = 10k v s = 3v, 0c t a 70c v s = 3v, C40c t a 85c l l 200 133 100 1500 v/mv v/mv v/mv v s = 5v, v o = 500mv to 4.5v, r l = 10k v s = 5v, 0c t a 70c v s = 5v, C40c t a 85c l l 400 250 200 500 v/mv v/mv v/mv v ol output voltage swing low no load i sink = 5ma v s = 5v, i sink = 10ma l l l 3 200 400 8 500 800 mv mv mv v oh output voltage swing high v s = 3v, no load v s = 3v, i source = 5ma l l 2.91 2.6 2.94 2.8 v v v s = 5v, no load v s = 5v, i source = 10ma l l 4.91 4.5 4.94 4.74 v v i sc short-circuit current (note 2) v s = 3v, short to gnd v s = 3v, short to v cc 5 15 10 30 ma ma v s = 5v, short to gnd v s = 5v, short to v cc 15 20 30 40 ma ma minimum supply voltage l 2.7 v reverse supply voltage i s = C100a l 18 v i s supply current (note 6) 0c t a 70c C40c t a 85c l l 40 55 60 65 a a a supply current, shdn v pin5 = 2v, no load (note 10) l 5 15 a
lt1782 4 1782fc electrical characteristics the l denotes the specifcations which apply over the full operating temperature range, otherwise specifcations are at t a = 25c. v s = 3v, 0v; v s = 5v, 0v, v cm = v out = half supply, for the 6-lead part v pin5 = 0v, pulse power tested unless otherwise specifed. symbol parameter conditions lt1782c/lt1782i units min typ max i shdn shutdown pin current v pin5 = 0.3v, no load (note 10) v pin5 = 2v, no load (note 10) v pin5 = 5v, no load (note 10) l l l 0.5 2 5 8 na a a shutdown output leakage current v pin5 = 2v, no load (note 10) l 0.05 1 a maximum shutdown pin current v pin5 = 18v, no load (note 10) l 10 30 a v l shutdown pin input low voltage (note 10) l 0.3 v v h shutdown pin input high voltage (note 10) l 2 v t on turn-on time v pin5 = 5v to 0v, r l = 10k (note 10) 100 s t off turn-off time v pin5 = 0v to 5v, r l = 10k (note 10) 6 s gbw gain bandwidth product (note 5) f = 5khz 0c t a 70c C40c t a 85c l l 110 100 90 200 khz khz khz sr slew rate (note 5) a v = C1, r l = 0c t a 70c C40c t a 85c l l 0.035 0.031 0.028 0.07 v/s v/s v/s t s settling time v s = 5v, ?v out = 2v to 0.1%, a v = C1 45 s thd distortion v s = 3v, v o = 2v p-p , a v = 1, r l = 10k, f = 1khz 0.003 % fpbw full-power bandwidth (note 9) v out = 2v p-p 11 khz the l denotes the specifcations which apply over the full operating temperature range, otherwise specifcations are at t a = 25c. v s = 5v, v cm = 0v, v out = 0v, for the 6-lead part v pin5 = v C , pulse power tested unless otherwise specifed. symbol parameter conditions lt1782c/lt1782i units min typ max v os input offset voltage t a = 25c 0c t a 70c C40c t a 85c l l 500 900 1050 1200 v v v ?v os /?t input offset voltage drift (note 7) l 2 5 v/c i os input offset current l 0.7 2 na i b input bias current l 8 15 na input bias current drift l 0.01 na/c input noise voltage 0.1hz to 10hz 1 v p-p e n input noise voltage density f = 1khz 50 nv/ hz i n input noise current density f = 1khz 0.05 pa/hz r in input resistance differential common mode, v cm = C5v to 13v l l 3.4 1.5 6.5 3 m? m? c in input capacitance 5 pf input voltage range l C5 13 v cmrr common mode rejection ratio v cm = C5v to 13v l 68 80 db a vol large-signal voltage gain v o = 4v, r l = 10k 0c t a 70c C40c t a 85c l l 55 40 30 150 v/mv v/mv v/mv
lt1782 5 1782fc symbol parameter conditions lt1782c/lt1782i units min typ max v ol output voltage swing low no load i sink = 5ma i sink = 10ma l l l C4.997 C4.8 C4.6 C4.992 C4.5 C4.2 v v v v oh output voltage swing high no load i sink = 5ma i sink = 10ma l l l 4.91 4.6 4.5 4.94 4.8 4.74 v v v i sc short-circuit current (note 2) short to gnd 0c t a 70c l 18 15 30 ma ma psrr power supply rejection ratio v s = 1.5v to 9v l 90 100 db i s supply current 0c t a 70c C40c t a 85c l l 45 60 65 70 a a a supply current, shdn v pin5 = C3v, v s = 5v, no load (note 10) l 6 20 a i shdn shutdown pin current v pin5 = C4.7v, v s = 5v, no load (note 10) v pin5 = C3v, v s = 5v, no load (note 10) l l 0.5 2 8 na a maximum shutdown pin current v pin5 = 9v, v s = 9v (note 10) l 10 30 a shutdown output leakage current v pin5 = C7v, v s = 9v, no load (note 10) l 0.05 1 a v l shutdown pin input low voltage v s = 5v (note 10) l C4.7 v v h shutdown pin input high voltage v s = 5v (note 10) l C3 v t on turn-on time v pin5 = 0v to C5v, r l = 10k (note 10) l 100 s t off turn-off time v pin5 = C5v to 0v, r l = 10k (note 10) l 6 s gbw gain bandwidth product f = 5khz 0c t a 70c C40c t a 85c l l 120 110 100 225 khz khz khz sr slew rate a v = C1, r l = , v o = 4v, measured at v o = 2v 0c t a 70c C40c t a 85c l l 0.0375 0.033 0.030 0.075 v/s v/s v/s t s settling time ?v out = 4v to 0.1%, a v = 1 50 s fpbw full-power bandwidth (note 9) v out = 8v p-p 3 khz electrical characteristics the l denotes the specifcations which apply over the full operating temperature range, otherwise specifcations are at t a = 25c. v s = 5v, v cm = 0v, v out = 0v, for the 6-lead part v pin5 = v C , pulse power tested unless otherwise specifed. the l denotes the specifcations which apply over the full operating temperature range of C40c t a 125c. v s = 3v, 0v; v s = 5v, 0v; v cm = v out = half supply, for the 6-lead part v pin5 = 0v, pulse power tested unless otherwise specifed. (note 4) symbol parameter conditions lt1782h units min typ max v os input offset voltage l 400 800 3 v mv ?v os /?t input offset voltage drift l 15 v/c i os input offset current v cm = 18v (note 5) l l 3 2 na a i b input bias current v cm = 18v (note 5) l l 30 25 na a input voltage range l 0.3 18 v cmrr common mode rejection ratio v cm = 0.3v to v cc C 1v v cm = 0.3v to 18v l l 76 60 db db
lt1782 6 1782fc symbol parameter conditions lt1782h units min typ max a vol large-signal voltage gain v s = 3v, v o = 500mv to 2.5v, r l = 10k l 200 50 1500 v/mv v/mv v s = 5v, v o = 500mv to 4.5v, r l = 10k l 400 80 1500 v/mv v/mv v ol output voltage swing low no load i sink = 5ma v s = 5v, i sink = 10ma l l l 15 900 1500 mv mv mv v oh output voltage swing high v s = 3v, no load v s = 3v, i source = 5ma l l 2.85 2.20 v v v s = 5v, no load v s = 5v, i source = 10ma l l 4.85 3.80 v v psrr power supply rejection ratio v s = 3v to 12.5v, v cm = v o = 1v l 80 db minimum supply voltage l 2.7 v reverse supply voltage i s = C100a l 18 v i s supply current l 40 55 100 a a supply current, shdn v pin5 = 2v, no load (note 10) l 25 a i shdn shutdown pin current v pin5 = 0.3v, no load (note 10) v pin5 = 2v, no load (note 10) l l 0.5 12 na a output leakage current v pin5 = 2v, no load (note 10) l 3 a maximum shutdown pin current v pin5 = 18v, no load l 45 a v l shutdown pin input low voltage (note 10) l 0.3 v v h shutdown pin input high voltage (note 10) l 2 v gbw gain bandwidth product f = 10khz (note 5) l 110 65 200 khz khz sr slew rate a v = C1, r l = (note 7) l 0.035 0.020 0.07 v/s v/s electrical characteristics the l denotes the specifcations which apply over the full operating temperature range of C40c t a 125c. v s = 3v, 0v; v s = 5v, 0v; v cm = v out = half supply, for the 6-lead part v pin5 = 0v, pulse power tested unless otherwise specifed. (note 4) the l denotes the specifcations which apply over the full operating temperature range of C40c t a 125c. v s = 5v, v cm = 0v, v out = 0v, for the 6-lead part v pin5 = v C , pulse power tested unless otherwise specifed. (note 4) symbol parameter conditions lt1782h units min typ max v os input offset voltage l 500 900 3.2 v mv ?v os /?t input offset voltage drift (note 9) l 15 v/c i os input offset current l 3 na i b input bias current l 30 na cmrr common mode rejection ratio v cm = C4.7v to 13v l 60 db a vol large-signal voltage gain v s = 4v, r l = 10k l 55 20 150 v/mv v/mv v o output voltage swing no load i sink = 5ma i sink = 10ma l l l 4.85 4.10 3.50 v v v
lt1782 7 1782fc symbol parameter conditions lt1782h units min typ max psrr power supply rejection ratio v s = 1.5v to 9v l 80 db minimum supply voltage l 1.35 v i s supply current l 45 60 110 a a supply current, shdn v pin5 = C3v, v s = 5v, no load (note 10) l 25 a i shdn shutdown pin current v pin5 = C4.7v, v s = 5v, no load (note 10) v pin5 = C3v, v s = 5v, no load (note 10) l l 0.5 12 na a maximum shutdown pin current v pin5 = 9v, v s = 9v, no load (note 10) l 45 a output leakage current v pin5 = C7v, v s = 9v, no load l 3 a v l shutdown pin input low voltage v s = 5v l C4.7 v v h shutdown pin input high voltage v s = 5v l C3 v gbw gain bandwidth product f = 5khz l 120 70 225 khz khz sr slew rate a v = C1, r l = , v o = 4v measured at v o = 2v l 0.0375 0.0220 0.075 v/s v/s electrical characteristics the l denotes the specifcations which apply over the full operating temperature range of C40c t a 125c. v s = 5v, v cm = 0v, v out = 0v, for the 6-lead part v pin5 = v C , pulse power tested unless otherwise specifed. (note 4) 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 absolute maximum. note 3: the lt1782c and lt1782i are guaranteed functional over the operating temperature range of C40c to 85c. the lt1782h is guaranteed functional over the operating temperature range of C40c to 125c. note 4: the lt1782c is guaranteed to meet specifed performance from 0c to 70c. the lt1782c is designed, characterized and expected to meet specifed performance from C40c to 85c but is not tested or qa sampled at these temperatures. the lt1782i is guaranteed to meet specifed performance from C 40c to 85c. the lt1782h is guaranteed to meet specifed performance from C40c to 125c. note 5: v s = 5v limits are guaranteed by correlation to v s = 3v and v s = 5v or v s = 9v tests. note 6: v s = 3v limits are guaranteed by correlation to v s = 5v and v s = 5v or v s = 9v tests. note 7: guaranteed by correlation to slew rate at v s = 5v, and gbw at v s = 3v and v s = 5v tests. note 8: this specifcation implies a typical input offset voltage of 1.8mv at v cm = 18v and a maximum input offset voltage of 7.2mv at v cm = 18v. note 9: this parameter is not 100% tested. note 10: specifcations apply to 6-lead sot-23 with shutdown. note 11: full-power bandwidth is calculated for the slew rate. fpbw = sr/2?v p .
lt1782 8 1782fc typical performance characteristics input bias current vs common mode voltage output saturation voltage vs load current (output high) output saturation voltage vs load current (output low) output saturation voltage vs input overdrive output short-circuit current vs temperature 0.1hz to 10hz noise voltage supply current vs supply voltage minimum supply voltage output voltage vs large input voltage supply voltage (v) 2 6 10 14 4 8 12 16 18 supply current (a) 1782 g01 50 45 40 35 30 25 20 t a = 125c t a = 25c t a = ?55c total supply voltage (v) 0 1 2 3 4 5 input offset voltage change (v) 1782 g02 400 300 200 100 0 ?100 ?200 ?300 ?400 t a = 125c t a = ?55c t a = 25c v in (v) ?10 ?8 6 8 10 12 14 16 18 v out (v) 1782 g03 5 4 3 2 1 0 v s = 5v, 0v ?6 ?4 0 2?2 4 v in 5v ? + common mode voltage (v) 3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.4 15 16 18 input bias current (na) 1782 g04 6000 5000 4000 3000 2000 1000 40 30 20 10 0 ?10 t a = 125c v s = 5v, 0v t a = ?55c t a = 25c 1 0.01 output saturation voltage (v) 0.1 1 100 10 1m 10m 1782 g05 t a = 125c v s = 2.5v v od = 30mv t a = ?55c t a = 25c sourcing load current (a) sinking load current (a) 0.01 output saturation voltage (v) 0.1 1 1 1m 10m 1782 g06 0.001 10 1 t a = 125c t a = ?55c t a = 25c v s = 2.5v v od = 30mv input overdrive (mv) 0 output saturation voltage (mv) 100 10 1 1782 g07 10 20 30 40 50 60 output high output low v s = 2.5v no load temperature (c) ?50 ?25 0 25 50 75 100 125 output current (ma) 1782 g08 40 35 30 25 20 15 v s = 5v sinking current sourcing current time (sec) noise voltage (400nv/div) 1782 g09 v s = 2.5v 0 1 2 3 4 5 6 7 8 9 10
lt1782 9 1782fc typical performance characteristics gain bandwidth product vs temperature slew rate vs temperature gain bandwidth product and phase margin vs supply voltage gain bandwidth product and phase margin vs load resistance psrr vs frequency cmrr vs frequency noise voltage density vs frequency input noise current vs frequency gain and phase shift vs frequency frequency (hz) input noise voltage density (nv/hz) 80 70 60 50 40 30 20 1 100 1k 10k 1782 g10 10 frequency (hz) input noise current density (pa/hz) 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 1 100 1k 10k 1782 g11 10 v s = 2.5v frequency (hz) 1k gain (db) 70 60 50 40 30 20 10 0 ?10 ?20 ?30 phase shift (deg) 100 80 60 40 20 0 ?20 ?40 ?60 ?80 ?100 10k 100k 1m 1782 g12 v s = 2.5v phase gain temperature (c) ?50 ?25 0 25 50 75 100 125 gain bandwidth (khz) 1782 g13 230 220 210 200 190 180 170 f = 5khz v s = 2.5v temperature (c) ?50 ?25 0 25 50 75 100 125 slew rate (v/s) 1782 g14 0.11 0.10 0.09 0.08 0.07 0.06 0.05 0.04 v s = 2.5v rising falling total supply voltage (v) 0 2 4 6 8 10 12 14 16 18 gain baindwidth product (khz) phase margin (deg) 1782 g15 240 220 200 180 160 60 55 50 a v = ?1 r f = r g = 10k f = 5khz phase margin gain bandwidth product load resistance () 1k gain bandwidth product (khz) 250 200 150 100 50 phase margin (deg) 70 60 50 10k 100k 1782 g16 v s = 2.5v a v = ?1 r f = r g = 10k f = 5khz phase margin gain bandwidth product frequency (hz) 1k power supply rejection ratio (db) 90 80 70 60 50 40 30 20 10 0 ?10 10k 100k 1m 1782 g17 v s = 2.5v positive supply negative supply frequency (hz) 1k common mode rejection ratio (db) 110 100 90 80 70 60 50 40 30 10k 100k 1782 g18 v s = 2.5v
lt1782 10 1782fc typical performance characteristics capacitive load handling overshoot vs capacitive load undistorted output swing vs frequency total harmonic distortion + noise vs frequency total harmonic distortion + noise vs load resistance total harmonic distortion + noise vs output voltage amplitude open-loop gain output impedance vs frequency disabled output impedance vs frequency (note 8) settling time to 0.1% vs output step frequency (hz) 100 0.1 output impedance () 10 10k 10k 1k 100k 1m 1782 g19 1 100 1k a v = 100 v s = 2.5v a v = 10 a v = 1 frequency (hz) 100 100 output impedance () 10k 1m 1k 10k 100k 1m 1782 g20 1k 100k v s = 2.5v v pin5 (shutdown) = 2.5v settling time (s) 25 30 35 40 50 60 70 80 output step (v) 1782 g21 4 3 2 1 0 ?1 ?2 ?3 ?4 a v = 1 a v = ?1 a v = 1 a v = ?1 v s = 5v capacitive load (pf) 10 overshoot (%) 40 35 30 25 20 15 10 5 0 100 1000 10000 1782 g22 v s = 5v, 0v v cm = 2.5v a v = 1 a v = 5 a v = 10 frequency (hz) 100 1k 10k 100k output swing (v p-p ) 12 10 8 6 4 2 0 1782 g23 distortion 1% a v = 1 v s = 1.5v v s = 5v frequency (hz) 0.010 thd + noise (%) 0.1 10 1k 10k 1782 g24 0.001 100 1 a v = ?1 r f = r g = 100k a v = 1 v s = 3v, 0v v out = 2v p-p v cm = 1.2v r l = 10k load resistance to ground () 0.1 thd + noise (%) 1 100 100k 1782 g25 0.01 0.001 1k 10k 10 v s = 3v total a v = 1 v in = 2v p-p at 1khz v s = 1.5v v in = 1v v s = 3v, 0v v in = 0.5v to 2.5v v s = 3v, 0v v in = 0.2v to 2.2v output voltage amplitude (v p-p ) 0.1 thd + noise (%) 1 0 1 2 3 1782 g26 0.01 0.001 10 a v = ?1, r f = r g = 100k v s = 1.5v v cm = 0v a v = 1 v s = 1.5v v cm = 0v f = 1khz, r l = 10k a v = ?1, r f = r g = 100k v s = 3v, 0v v cm = 1.5v a v = 1 v s = 3v. 0v v cm = 1.5v output voltage (v) ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 5 6 input offset voltage change (50v/div) 1782 g27 r l = 10k r l = 50k r l = 2k v s = 5v
lt1782 11 1782fc typical performance characteristics supply current vs shutdown voltage large-signal response small-signal response applications information supply voltage the positive supply pin of the lt1782 should be bypassed with a small capacitor (typically 0.1f) within an inch of the pin. when driving heavy loads, an additional 4.7f electrolytic capacitor should be used. when using split supplies, the same is true for the negative supply pin. the lt1782 is protected against reverse battery voltages up to 18v. in the event a reverse battery condition occurs, the supply current is typically less than 1na. inputs the lt1782 has two input stages, npn and pnp (see the simplifed schematic), resulting in three distinct operating regions as shown in the input bias current vs common mode typical performance curve. for input voltages about 0.8v or more below v + , the pnp input stage is active and the input bias current is typically C8na. when the input common mode voltage is within 0.5v of the positive rail, the npn stage is operating and the input bias current is typically 15na. increases in tem - perature will cause the voltage at which operation switches from the pnp input stage to the npn input stage to move towards v + . the input offset voltage of the npn stage is untrimmed and is typically 1.8mv. a schottky diode in the collector of the input npn tran - sistors, along with special geometries for these npn transistors, allows the lt1782 to operate with either or both of its inputs above v + . at about 0.3v above v + , the npn input transistor is fully saturated and the input bias current is typically 4a at room temperature. the input offset voltage is typically 1.8mv when operating above v + . the lt1782 will operate with its inputs 18v above v C regardless of v + . the inputs are protected against excursions as much as 10v below v C by an internal 6k resistor in series with each input and a diode from the input to the negative supply. the input stage of the lt1782 incorporates phase reversal protection to prevent the output from phase reversing for inputs up to 9v below v C . there are no clamping diodes between the inputs and the maximum differential input voltage is 18v. output the output of the lt1782 can swing to within 60mv of the positive rail with no load and within 3mv of the negative rail with no load. when monitoring voltages within 60mv of the positive rail or within 3mv of the negative rail, gain should be taken to keep the output from clipping. the lt1782 can sink and source over 30ma at 5v supplies, shutdown pin voltage (v) 0 0.5 1 1.5 2 2.5 supply current (a) 1782 g28 50 40 30 20 10 0 t a = 25c t a = ?55c t a = 125c v s = 5v, 0v v s = 5v a v = 1 c l = 15pf 1782 g29 v s = 5v a v = 1 c l = 15pf 1782 g30
lt1782 12 1782fc applications information sourcing current is reduced to 10ma at 3v total supplies as noted in the electrical characteristics section. the lt1782 is internally compensated to drive at least 600pf of capacitance under any output loading condi- tions. a 0.22f capacitor in series with a 150? resistor between the output and ground will compensate these amplifers for larger capacitive loads, up to 10,000pf, at all output currents. distortion there are two main contributors to distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current, and distortion caused by non - linear common mode rejection. if the op amp is operating inverting, there is no common mode induced distortion. if the op amp is operating in the pnp input stage (input is not within 0.8v of v + ), the cmrr is very good, typically 100db. when the lt1782 switches between input stages, there is signifcant nonlinearity in the cmrr. lower load resistance increases the output crossover distortion but has no effect on the input stage transition distortion. for lowest distortion, the lt1782 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (v + C 0.8v). see the typical performance characteristics curves, total harmonic distortion + noise vs ouput voltage amplitude. gain the open-loop gain is almost independent of load when the output is sourcing current. this optimizes performance in single supply applications where the load is returned to ground. the typical performance curve of open-loop gain for various loads shows the details. shutdown the 6-lead part includes a shutdown feature that disables the part, reducing quiescent current and making the output high impedance. the part can be shut down by bringing the shdn pin 1.2v or more above v C . when shut down, the supply current is about 5a and the output leakage current is less than 1a (v C v out v + ). in normal opera- tion, the shdn pin can be tied to v C or left foating. see the typical performance characteristics curves, supply current vs shutdown pin voltage. simplified schematic q10 d5 q9 q1 q7 r2 6k r3 6k r4 40k q8 q5 ?in +in q11 q12 d4 q2 d1 q6 q13 q14 r1 30k r5 40k q4 q15 q19 d3 q3 q16 q18 q22 v + q17 q20 q21 out shdn v ? 1782 ss 2a + q23 q24 q25 q26 j1
lt1782 13 1782fc typical applications protected fault conditions compact, high output current, low dropout, precision 2.5v supply 1782 ta02 ?18v 24v v + lt1782 5v ok! ok! + 18v 5v 10v 5v ok! ok! + + reverse battery input overvoltage input differential voltage input below ground lt1782 lt1782 lt1782 ? + lt1782 v s 2.8v to 3.3v supply current ? 120a, no load i load = 0ma to 300ma note: not current limited 0.1f 1f 1782 ta03 1k 5% 22 5% 680 5% 100k 5% vishay siliconix si3445dv v out 2.5v lt1790-2.5
lt1782 14 1782fc s6 package 6-lead plastic tsot-23 (reference ltc dwg # 05-08-1636) package description s5 package 5-lead plastic tsot-23 (reference ltc dwg # 05-08-1635) 1.50 ? 1.75 (note 4) 2.80 bsc 0.30 ? 0.45 typ 5 plcs (note 3) datum ?a? 0.09 ? 0.20 (note 3) s5 tsot-23 0302 rev b pin one 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 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 1.50 ? 1.75 (note 4) 2.80 bsc 0.30 ? 0.45 6 plcs (note 3) datum ?a? 0.09 ? 0.20 (note 3) s6 tsot-23 0302 rev b 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
lt1782 15 1782fc 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 c 10/10 revised supply current in shutdown mode from 5ma to 5a in shutdown section of applications information 12 (revision history begins at rev c)
lt1782 16 1782fc linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com linear technology corporation 1999 lt 1010 rev c ? printed in usa related parts typical applications current source programmable gain, a v = 2, a v = 20, 100khz amplifer programmable gain amplifer frequency response part number description comments lt1783 micropower over-the-top sot-23 rail-to-rail input and output op amp sot-23 package, micropower 210a per amplifer, rail-to-rail input and output, 1.25mhz gbw lt1490/lt1491 dual/quad over-the-top micropower rail-to-rail input and output op amps single supply input range: C0.4v to 44v, micropower 50a per amplifer, rail-to-rail input and output , 200khz gbw lt1636 single over-the-top micropower rail-to-rail input and output op amp 55a supply current, v cm extends 44v above v ee , independent of v cc , msop package, shutdown function lt1638/lt1639 dual/quad, 1.2mhz, 0.4v/s, over-the-top micropower rail-to-rail input and output op amps 170ma supply current, single supply input range: C0.4v to 44v, rail-to-rail input and output ? + lt1782 r1 lt1634-1.25 1782 ta04 v cc i out = 2n3906 1.25v r1 ? + lt1782 v cc shdn in out 1782 ta05 v ee r2 9.09k r1 10k r3 1k ? + lt1784 v cc v cc a v = 2 a v = 20 shdn v ee ( ) a v = 1+ r1 + r2 r3 ( ) or 1+ r1 r2 + r3 frequency (hz) gain (db) 30 25 20 15 10 5 0 ?5 ?10 ?15 ?20 1k 100k 1m 10m 1782 ta06 10k a v = 20 a v = 2

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