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lt1634 1 1634fe typical application features applications description micropower precision shunt voltage reference super accurate 4.096v output references n initial voltage accuracy: 0.05% n low operating current: 10a n low drift: 10ppm/c max n less than 1 dynamic impedance n both commercial and industrial temperature range parts are available n available in 1.25v, 2.5v, 4.096v and 5v in so-8 and to-92 packages n 1.25v and 2.5v available in msop package n portable meters n precision regulators n a/d and d/a converters n calibrators the lt ? 1634 is a micropower, precision, shunt voltage reference. the bandgap reference uses trimmed preci- sion thin ? lm resistors to achieve 0.05% initial voltage accuracy. improved curvature correction technique guar- antees 10ppm/c maximum temperature drift. advances in design, processing and packaging techniques guarantee 10a operation and low temperature cycling hysteresis. the lt1634 does not require an output compensation capacitor, but is stable with capacitive loads. low dynamic impedance makes the lt1634 reference easy to use from unregulated supplies. the lt1634 reference can be used as a high performance upgrade to the lm185/lm385, lt1004 and lt1034 where lower power and guaranteed temperature drift is required. C + lt1495 5v C5v lt1634-4.096 i s = 200a output accuracy better than 0.075% at 500a output ltc ? 1043 5v C5v C5v 5v 1634 ta01 1f 1f 6 4 17 18 5 15 45k v out 4.096v C + lt1495 v out C4.096v temperature (c) C40 reverse voltage change (mv) 1.5 0 1634 ta02 0 C1.0 C20 20 C1.5 C2.0 2.0 1.0 0.5 C0.5 40 60 80 100 i r = 10a v out = 1.25v temperature drift lt, ltc and ltm are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners.
lt1634 2 1634fe absolute maximum ratings current operating 1.25v ...............................................................100ma 2.5v ...................................................................50ma 4.096v, 5v .........................................................30ma forward current .....................................................20ma (note 1) 1 2 3 4 dnc* dnc* dnc* gnd 8 7 6 5 dnc* dnc* v out test** top view ms8 package 8-lead plastic msop t jmax = 125c, ja = 250c/w 1 2 3 4 8 7 6 5 top view s8 package 8-lead plastic so dnc* dnc* dnc* gnd dnc* dnc* v out test** t jmax = 125c, ja = 190c/w bottom view test** v out gnd z package 3-lead plastic to-92 t jmax = 125c, ja = 190c/w order information lead free finish tape and reel part marking package description specified temperature range lt1634bcms8-1.25#pbf lt1634bcms8-1.25#trpbf ltcv 8-lead plastic msop 0c to 70c lt1634bcms8-2.5#pbf lt1634bcms8-2.5#trpbf ltdf 8-lead plastic msop 0c to 70c lt1634acs8-1.25#pbf lt1634acs8-1.25#trpbf 1634a1 8-lead plastic so 0c to 70c lt1634acs8-2.5#pbf lt1634acs8-2.5#trpbf 1634a2 8-lead plastic so 0c to 70c lt1634acs8-4.096#pbf lt1634acs8-4.096#trpbf 1634a4 8-lead plastic so 0c to 70c lt1634acs8-5#pbf lt1634acs8-5#trpbf 1634a5 8-lead plastic so 0c to 70c lt1634ais8-1.25#pbf lt1634ais8-1.25#trpbf 634ai1 8-lead plastic so C40c to 85c lt1634ais8-2.5#pbf lt1634ais8-2.5#trpbf 634ai2 8-lead plastic so C40c to 85c lt1634ais8-4.096#pbf lt1634ais8-4.096#trpbf 634ai4 8-lead plastic so C40c to 85c lt1634ais8-5#pbf lt1634ais8-5#trpbf 634ai5 8-lead plastic so C40c to 85c lt1634bcs8-1.25#pbf lt1634bcs8-1.25#trpbf 1634b1 8-lead plastic so 0c to 70c lt1634bcs8-2.5#pbf lt1634bcs8-2.5#trpbf 1634b2 8-lead plastic so 0c to 70c lt1634bcs8-4.096#pbf lt1634bcs8-4.096#trpbf 1634b4 8-lead plastic so 0c to 70c lt1634bcs8-5#pbf lt1634bcs8-5#trpbf 1634b5 8-lead plastic so 0c to 70c lt1634bis8-1.25#pbf lt1634bis8-1.25#trpbf 634bi1 8-lead plastic so C40c to 85c lt1634bis8-2.5#pbf lt1634bis8-2.5#trpbf 634bi2 8-lead plastic so C40c to 85c lt1634bis8-4.096#pbf lt1634bis8-4.096#trpbf 634bi4 8-lead plastic so C40c to 85c lt1634bis8-5#pbf lt1634bis8-5#trpbf 634bi5 8-lead plastic so C40c to 85c lt1634ccz-1.25#pbf lt1634ccz-1.25#trpbf 3-lead plastic to-92 0c to 70c lt1634ccz-2.5#pbf lt1634ccz-2.5#trpbf 3-lead plastic to-92 0c to 70c lt1634ccz-4.096#pbf lt1634ccz-4.096#trpbf 3-lead plastic to-92 0c to 70c lt1634ccz-5#pbf lt1634ccz-5#trpbf 3-lead plastic to-92 0c to 70c consult ltc marketing for parts speci? ed with wider operating temperature ranges. consult ltc marketing for information on lead based ? nish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel speci? cations, go to: http://www.linear.com/tapeandreel/ operating temperature range commercial ............................................. 0c to 70c industrial .............................................C40c to 85c storage temperature range (note 1) ..... C65c to 150c lead temperature (soldering, 10 sec)................... 300c pin configuration *connected internally. do not connect external circuitry to these pins. **the test pin can be left unconnected or connected to the gnd pin (gnd pin on z package, pin4 on ms8 and s8 packages)
lt1634 3 1634fe temperature accuracy (%) temperature coefficient (ppm/c) package type ms8 s8 z 0c to 70c 0.05 10 lt1634acs8-1.25 lt1634acs8-2.5 lt1634acs8-4.096 lt1634acs8-5 C40c to 85c 0.05 10 lt1634ais8-1.25 lt1634ais8-2.5 lt1634ais8-4.096 lt1634ais8-5 0c to 70c 0.05 25 lt1634bcms8-1.25 lt1634bcms8-2.5 lt1634bcs8-1.25 lt1634bcs8-2.5 lt1634bcs8-4.096 lt1634bcs8-5 C40c to 85c 0.05 25 lt1634bis8-1.25 lt1634bis8-2.5 lt1634bis8-4.096 lt1634bis8-5 0c to 70c 0.20 25 lt1634ccz-1.25 lt1634ccz-2.5 lt1634ccz-4.096 lt1634ccz-5 available options 1.25v electrical characteristics parameter conditions min typ max units reverse breakdown voltage lt1634acs8/lt1634bcms8/lt1634bcs8/ lt1634ais8/lt1634bis8 (i r = 10a) 1.24937 C0.05 1.250 1.25062 0.05 v % lt1634ccz (i r = 10a) 1.24750 C0.20 1.250 1.25250 0.20 v % lt1634acs8 (i r = 10a) l 1.24849 C0.12 1.250 1.25149 0.12 v % lt1634ais8 (i r = 10a) l 1.24781 C0.175 1.250 1.25218 0.175 v % lt1634bcs8/lt1634bcms8 (i r = 10a) l 1.24718 C0.225 1.250 1.25281 0.225 v % lt1634bis8 (i r = 10a) l 1.24547 C0.362 1.250 1.25453 0.362 v % lt1634ccz (i r = 10a) l 1.24531 C0.375 1.250 1.25469 0.375 v % reverse breakdown change with current (note 4) 10a i r 2ma l 0.25 0.30 1 2 mv mv 2ma i r 20ma l 2 2 8 10 mv mv minimum operating current l 7a temperature coef? cient (note 8) lt1634a, i r = 10a lt1634b/lt1634c, i r = 10a l 4 10 10 25 ppm/c ppm/c reverse dynamic impedance (note 5) 10a i r 2ma l 0.125 0.150 0.5 1.0 low frequency noise (note 6) i r = 10a, 0.1hz f 10hz 10 v p-p hysteresis (note 7) t = C40c to 85c t = 0c to 70c 160 40 ppm ppm the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. (note 3)
lt1634 4 1634fe 2.5v electrical characteristics parameter conditions min typ max units reverse breakdown voltage lt1634acs8/lt1634bcms8/lt1634bcs8/ lt1634ais8/lt1634bis8 (i r = 10a) 2.49875 C0.05 2.500 2.50125 0.05 v % lt1634ccz (i r = 10a) 2.49500 C0.20 2.500 2.50500 0.20 v % lt1634acs8 (i r = 10a) l 2.49700 C0.12 2.500 2.50300 0.12 v % lt1634ais8 (i r = 10a) l 2.49562 C0.175 2.500 2.50437 0.175 v % lt1634bcms8/lt1634bcs8 (i r = 10a) l 2.49437 C0.225 2.500 2.50562 0.225 v % lt1634bis8 (i r = 10a) l 2.49094 C0.362 2.500 2.50906 0.362 v % lt1634ccz (i r = 10a) l 2.49062 C0.375 2.500 2.50937 0.375 v % reverse breakdown change with current (note 4) 10a i r 2ma l 0.30 0.40 1.5 3.0 mv mv 2ma i r 20ma l 2 2 8 10 mv mv minimum operating current l 8a temperature coef? cient (note 8) lt1634a, i r = 10a lt1634b/lt1634c, i r = 10a l l 4 10 10 25 ppm/c ppm/c reverse dynamic impedance (note 5) 10a i r 2ma l 0.15 0.20 0.75 1.50 low frequency noise (note 6) i r = 10a, 0.1hz f 10hz 15 v p-p hysteresis (note 7) t = C40c to 85c t = 0c to 70c 160 40 ppm ppm the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. (note 3) 4.096 electrical characteristics the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. (note 3) parameter conditions min typ max units reverse breakdown voltage lt1634acs8/lt1634bcs8/ lt1634ais8/lt1634bis8 (i r = 20a) 4.09395 C0.05 4.096 4.09805 0.05 v % lt1634ccz (i r = 20a) 4.08780 C0.20 4.096 4.10419 0.20 v % lt1634acs8 (i r = 20a) l 4.09108 C0.12 4.096 4.10091 0.12 v % lt1634ais8 (i r = 20a) l 4.08883 C0.175 4.096 4.10317 0.175 v % lt1634bcs8 (i r = 20a) l 4.08678 C0.225 4.096 4.10522 0.225 v % lt1634bis8 (i r = 20a) l 4.08115 C0.362 4.096 4.11085 0.362 v % lt1634ccz (i r = 20a) l 4.08064 C0.375 4.096 4.11137 0.375 v % reverse breakdown change with current (note 4) 20a i r 2ma l 0.30 0.40 1.5 3.0 mv mv 2ma i r 20ma l 6 6 15 20 mv mv minimum operating current l 15 a
lt1634 5 1634fe 4.096v electrical characteristics the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. (note 3) parameter conditions min typ max units temperature coef? cient (note 8) lt1634a, i r = 20a lt1634b/lt1634c, i r = 20a l l 4 10 10 25 ppm/c ppm/c reverse dynamic impedance (note 5) 20a i r 2ma l 0.15 0.20 0.75 1.50 low frequency noise (note 6) i r = 20a, 0.1hz f 10hz 30 v p-p hysteresis (note 7) t = C40c to 85c t = 0c to 70c 160 40 ppm ppm 5v electrical characteristics parameter conditions min typ max units reverse breakdown voltage lt1634acs8/lt1634bcs8/ lt1634ais8/lt1634bis8 (i r = 20a) 4.99750 C0.05 5.000 5.00250 0.05 v % lt1634ccz (i r = 20a) 4.99000 C0.20 5.000 5.01000 0.20 v % lt1634acs8 (i r = 20a) l 4.99400 C0.12 5.000 5.00600 0.12 v % lt1634ais8 (i r = 20a) l 4.99125 C0.175 5.000 5.00875 0.175 v % lt1634bcs8 (i r = 20a) l 4.98875 C0.225 5.000 5.01125 0.225 v % lt1634bis8 (i r = 20a) l 498188 C0.362 5.000 5.01813 0.362 v % lt1634ccz (i r = 20a) l 4.98126 C0.375 5.000 5.01876 0.375 v % reverse breakdown change with current (note 4) 20a i r 2ma l 0.30 0.40 1.5 3.0 mv mv 2ma i r 20ma l 6 6 15 20 mv mv minimum operating current l 15 a temperature coef? cient (note 8) lt1634a, i r = 20a lt1634b/lt1634c, i r = 20a l l 4 10 10 25 ppm/c ppm/c reverse dynamic impedance (note 5) 20a i r 2ma l 0.15 0.20 0.75 1.50 low frequency noise (note 6) i r = 20a, 0.1hz f 10hz 35 v p-p hysteresis (note 7) t = C40c to 85c t = 0c to 70c 160 40 ppm ppm the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. (note 3) 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: if the part is stored outside of the speci? c operating temperature range, the output may shift due to hysteresis. note 3: esd (electrostatic discharge) sensitive device. use proper esd handling precautions. note 4: output requires 0.1f for operating current greater than 1ma. note 5: this parameter is guaranteed by reverse breakdown change with current test. note 6: peak-to-peak noise is measured with a single highpass ? lter at 0.1hz and 2-pole lowpass ? lter at 10hz. note 7: hysteresis in output voltage is created by package stress that differs depending on whether the ic was previously at a higher or lower temperature. output voltage is always measured at 25c but the ic is cycled to 85c or C40c before successive measurements. hysteresis is roughly proportional to the square of the temperature change. hysteresis is not normally a problem for operational temperature excursions where the instrument might be stored at high or low temperature. note 8: temperature coef? cient is calculated from the minimum and maximum output voltage measured at t min , room and t max as follows: tc = (v omax C v omin )/(t max C t min ) incremental slope is also measured at 25c.
lt1634 6 1634fe 1.25v typical performance characteristics reverse characteristics temperature drift reverse voltage change vs current reverse dynamic impedance dynamic impedance vs frequency forward characteristics reverse voltage (v) 0 reverse current (a) 4 6 1.6 1634-1.25 g01 2 0 0.4 0.8 1.2 10 8 t a = C40c to 85c temperature (c) C40 reverse voltage change (mv) 1.5 0 1634-1.25 g02 0 C1.0 C20 20 C1.5 C2.0 2.0 1.0 0.5 C0.5 40 60 80 10a 100a 200a 500a 1ma reverse current (ma) 2 1 reverse voltage change (mv) 3 4 0.01 1 10 100 1634-1.25 g03 0 0.1 t a = C40c to 85c reverse current (ma) 1 10 dynamic impedance () 100 0.001 0.1 1 100 1634-1.25 g04 0.1 0.01 10 t a = 25c f = 25hz frequency (khz) dynamic impedance () 0.01 1 10 100 1634-1.25 g05 0.1 10000 1000 100 10 1 0.1 i r = 10a c out = 0f i r = 10a c out = 0.022f i r = 100a c out = 0.47f i r = 100a c out = 0f t a = 25c forward current (ma) 0.4 forward voltage (v) 0.8 1.2 0.01 1 10 100 1634-1.25 g06 0 0.1 t a = 25c 0.1hz to 10hz noise time (sec) 0 noise voltage (v/div) 8 6 4 2 0 C2 C4 C6 C8 40 1634-1.25 g07 10 20 30 50 60 70 t a = C40c to 85c i r = 10a response time 1v 1634-1.25 g08 5v 1.5v 0.5v 0v 0v out in i r = 10a c out = 0 200s/div response time 1v 1634-1.25 g09 5v 1.5v 0.5v 0v 0v out in i r = 10a c out = 0.1f 20ms/div
lt1634 7 1634fe 2.5v typical performance characteristics reverse characteristics temperature drift reverse voltage change vs current reverse dynamic impedance dynamic impedance vs frequency forward characteristics 0.1hz to 10hz noise response time response time reverse voltage (v) 0 0 reverse current (a) 4 6 8 10 0.5 1.0 1.5 2.0 1634-2.5 g01 2.5 2 3.0 t a = C40c to 85c temperature (c) C40 reverse voltage change (mv) 3 0 1634-2.5 g02 0 C2 C20 20 C3 C4 4 2 1 C1 40 60 80 10a 100a 200a 500a 1ma reverse current (ma) 2 reverse voltage change (mv) 4 5 0.01 1 10 100 1634-2.5 g03 0 0.1 6 3 1 t a = C40c to 85c reverse current (ma) 1 dynamic impedance () 10 0.001 0.1 1 10 1635-2.5 g04 0.1 0.01 100 100 t a = 25c f = 25hz frequency (khz) dynamic impedance () 0.01 1 10 100 1634-2.5 g05 0.1 10000 1000 100 10 1 0.1 i r = 10a c out = 0f i r = 100a c out = 0f i r = 10a c out = 0.068f i r = 100a c out = 0.47f t a = 25c forward current (ma) 0.4 forward voltage (v) 0.8 1.2 0.01 1 10 100 1634-2.5 g06 0 0.1 t a = 25c time (sec) 0 noise voltage (v/div) 0 10 80 70 1634-2.5 g07 C10 C20 10 20 30 40 50 60 20 C5 5 C15 15 t a = C40c to 85c i r = 10a 2v 1634-2.5 g08 5v 3v 1v 0v 0v i r = 10a c out = 0 200s/div 2v 1634-2.5 g09 5v 3v 1v 0v 0v i r = 10a c out = 0.1f 20ms/div
lt1634 8 1634fe 4.096v typical performance characteristics reverse characteristics temperature drift reverse voltage change vs current reverse dynamic impedance dynamic impedance vs frequency forward characteristics 0.1hz to 10hz noise response time response time reverse voltage (v) 0 0 reverse current (a) 4 8 12 16 20 1 234 1634-4 g01 5 t a = C40c to 85c temperature (c) C40 reverse voltage change (mv) 6 20 1634-4 g02 0 C4 C20 0 40 C6 4 2 C2 60 80 20a 100a 200a 500a 1ma reverse current (ma) 1 reverse voltage change (mv) 2 3 4 5 0.01 1 10 100 1634-4 g03 0 0.1 t a = C40c to 85c reverse current (ma) 1 dynamic impedance () 10 0.001 0.1 1 10 1635-4 g04 0.1 0.01 100 100 t a = 25c f = 25hz frequency (khz) dynamic impedance () 0.01 1 10 100 1634-4 g05 0.1 10000 1000 100 10 1 0.1 i r = 20a c out = 0f i r = 100a c out = 0f i r = 20a c out = 0.033f i r = 100a c out = 0.33f t a = 25c forward current (ma) 0.4 forward voltage (v) 0.8 1.2 0.01 1 10 100 1634-2.5 g06 0 0.1 t a = 25c time (sec) 0 noise voltage (v/div) 0 20 80 1634-4 g06 C20 C40 20 40 60 10 30 50 70 40 C10 10 C30 30 t a = C40c to 85c i r = 20a 4v 1634-4 g07 10v 6v 2v 0v 0v i r = 20a c out = 0 500s/div 4v 1634-4 g08 10v 6v 2v 0v 0v i r = 20a c out = 0.1f 20ms/div
lt1634 9 1634fe 5v typical performance characteristics reverse characteristics temperature drift reverse voltage change vs current reverse dynamic impedance dynamic impedance vs frequency forward characteristics 0.1hz to 10hz noise response time response time reverse voltage (v) 0 0 reverse current (a) 4 8 12 16 20 1 234 1634-5 g01 56 t a = C40c to 85c temperature (c) C40 reverse voltage change (mv) 6 20 1634-5 g02 0 C4 C20 0 40 C6 C8 8 4 2 C2 60 80 20a 100a 200a 500a 1ma reverse current (ma) 1 reverse voltage change (mv) 2 3 4 5 0.01 1 10 100 1634-5 g03 0 0.1 t a = C40c to 85c reverse current (ma) 1 dynamic impedance () 10 0.001 0.1 1 10 1635-5 g04 0.1 0.01 100 100 t a = 25c f = 25hz frequency (khz) dynamic impedance () 0.01 1 10 100 1634-5 g05 0.1 10000 1000 100 10 1 0.1 i r = 20a c out = 0f i r = 100a c out = 0f t a = 25c i r = 100a c out = 0.22f i r = 20a c out = 0.1f forward current (ma) 0.4 forward voltage (v) 0.8 1.2 0.01 1 10 100 1634-2.5 g06 0 0.1 t a = 25c time (sec) 0 noise voltage (v/div) 0 20 80 1634-5 g06 C20 C40 20 40 60 10 30 50 70 40 C10 10 C30 30 t a = C40c to 85c i r = 20a 4v 1634-5 g07 10v 6v 2v 0v 0v i r = 20a c out = 0 500s/div 4v 1634-5 g08 1 0v 6v 2v 0v 0v i r = 20a c out = 0.1f 20ms/div
lt1634 10 1634fe applications information typical applications the reverse characteristics of the lt1634 behave like a resistor in parallel with a zener diode. this simple, well behaved characteristic is important to the proper operation of circuits like figure 1. the adjustable output voltage reference depends upon positive feedback from the lt1495s output to start-up and regulate the bias cur- rent for the lt1634. C + lt1495 lt1634-1.25 v in 10.5v r1 50k to 1.75m r2 250k 1634 f01 v out 1.5v to 10v r b = v out C 1.25v 10a figure 1. adjustable output voltage reference reference for micropower a/d converter v ref +in Cin gnd 8 7 6 5 1 2 3 4 v cc clk d out cs/shdn ltc1286 v in 5v 0.1f 5v 1634 ta03 18k lt1634-4.096 c/p serial interface 0.1f the lt1634-5 generates the ltc1448 dual 12-bit dacs reference and supply voltage clk d in cs/ld ref 8 7 6 5 1 2 3 4 v outb v cc gnd v outa ltc1448 7.5v to 12v 0.1f v outb v outa 1634 ta04 3.48k lt1634-5 c/p serial interface 0.1f s8 package 8-lead plastic small outline (narrow 0.150 inch) (reference ltc dwg # 05-08-1610) .016 C .050 (0.406 C 1.270) .010 C .020 (0.254 C 0.508) s 45 0C 8 typ .008 C .010 (0.203 C 0.254) so8 0303 .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 1 2 3 4 .150 C .15 7 (3.810 C 3.9 8 note 3 8 7 6 5 .189 C .197 (4.801 C 5.004) note 3 .228 C .244 (5.791 C 6.197) .160 .005 ommended 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 ) package description
lt1634 11 1634fe package description ms8 package 8-lead plastic msop (reference ltc dwg # 05-08-1660) msop (ms8) 0307 rev f 0.53 p 0.152 (.021 p .006) seating plane note: 1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 0.18 (.007) 0.254 (.010) 1.10 (.043) max 0.22 C 0.38 (.009 C .015) typ 0.1016 p 0.0508 (.004 p .002) 0.86 (.034) ref 0.65 (.0256) bsc 0 C 6 typ detail a detail a gauge plane 12 3 4 4.90 p 0.152 (.193 p .006) 8 7 6 5 3.00 p 0.102 (.118 p .004) (note 3) 3.00 p 0.102 (.118 p .004) (note 4) 0.52 (.0205) ref 5.23 (.206) min 3.20 C 3.45 (.126 C .136) 0.889 p 0.127 (.035 p .005) recommended solder pad layout 0.42 p 0.038 (.0165 p .0015) typ 0.65 (.0256) bsc z package 3-lead plastic to-92 (similar to to-226) (reference ltc dwg # 05-08-1410) .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 .015 .002 (0.381 0.051) .060 .010 (1.524 0.254) 10 nom .140 .010 (3.556 0.127) z3 (to-92) 0801 321 .098 +.016/C.04 (2.5 +0.4/C0.1) 2 plcs to-92 tape and reel refer to tape and reel section of ltc data book for additional informatio
lt1634 12 1634fe linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 1998 lt 0409 rev e ? printed in usa related parts typical applications part number description comments ltc1440 micropower comparator with reference 3.7a max supply current, 1% 1.182v reference, msop , pdip and so-8 packages lt1460 micropower series reference 0.075% max, 10ppm/c max drift, 2.5v, 5v and 10v versions, msop , pdip , so-8, sot-23 and to-92 packages lt1495 1.5a precision rail-to-rail dual op amp 1.5a max supply current, 100pa max ios ltc1540 nanopower comparator with reference 600na max supply current, 2% 1.182v reference, msop and so-8 packages r h1 10m 5% r sw 1m 5% r s 51k 5% r3 1.75m 0.1% t0 load sw off v bat r4 1.25m 0.1% d1 a battery r h2 10m 5% r1 500k 0.1% r2 1.25m 0.1% d1, d2: 1n458 r1 to r4: car6 series irc (512) 992-7900 lt1634-1.25 d2 v bat 1.75v 1.25v 1634 ta05 C + a2 1/4 lt1496 C + a4 1/4 lt1496 C + C + a3 1/4 lt1496 a1 1/4 lt1496 charger C + lt1634 1.25v 1634 ta06 com i out 1a r1 to r3: mar5 series, irc (512) 992-7900 v out 1.5v r4 24k 5% r1 200k 0.1% r2 1m 0.1% r3 249k 0.1% 2 aaa alkaline cells 1/2 lt1495 C + 1/2 lt1495 ztx214c single cell li-ion battery supervisory circuit (i q = 20a) micropower voltage and current reference

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