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lt6650 1 6650fa applicatio s u features typical applicatio u descriptio u the lt ? 6650 is a micropower, low voltage 400mv refer- ence. operating with supplies from 1.4v up to 18v, the device draws only 5.6 a typical, making it ideal for low voltage systems as well as handheld instruments and industrial control systems. with only two resistors the internal buffer amplifier can scale the 400mv reference to any desired value up to the supply voltage. the reference is postpackage-trimmed to increase the output accuracy. the output can sink and source 200 a over temperature. quiescent power dissipation is 28 w. stability is ensured with any output capacitor of 1 f or higher. the lt6650 is the lowest voltage series reference available in the 5-lead sot-23 package. battery-operated systems handheld instruments industrial control systems data acquisition systems negative voltage references low quiescent current 5.6 a (typical) wide supply range: 1.4v to 18v 400mv reference 1% maximum accuracy over temperature at 5v rail-to-rail buffer amplifier 0.5% 400mv maximum initial accuracy at 5v shunt configurable sinks and sources current wide operational range C40 c to 125 c externally adjustable output voltage low profile 1mm 5-lead sot-23 (thinsot?) package micropower, 400mv reference with rail-to-rail buffer amplifier in sot-23 out v out 0.4v v in = 1.4v to 18v i q 6 a 5 1 fb in 4 gnd 1 f 2 lt6650 C + 1 f v r = 400mv reference 6650 ta01a temperature ( c) reference voltage (mv) 402 401 400 398 399 C30 10 50 90 6650 ta01b 130 C50 C10 30 70 110 typical lt6650 part v in = 5v sink 200 a source C200 a no load lt6650 temperature drift battery-powered 0.4v reference , ltc and lt are registered trademarks of linear technology corporation. thinsot is a trademark of linear technology corporation. all other trademarks are the property of their respective owners.
lt6650 2 6650fa total supply voltage (v in to gnd) ........................... 20v fb voltage (note 2) ....................... 20v to (gnd C 0.3v) output voltage (out) .................... 20v to (gnd C 0.3v) output short-circuit duration .......................... indefinite fb input current ................................................... 10ma operating temperature range ............... C40 c to 125 c specified temperature range lt6650cs5 ............................................. 0 c to 70 c lt6650is5 ........................................... C40 c to 85 c lt6650hs5 (note 3) ......................... C40 c to 125 c maximum junction temperature .......................... 150 c storage temperature range (note 4) .... C65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c order part number t jmax = 150 c, ja = 230 c/w the temperature grades are identified by a label on the shipping container. consult ltc marketing for parts specified with wider operating temperature ranges. absolute axi u rati gs w ww u package/order i for atio uu w (note 1) top view s5 package 5-lead plastic tsot-23 1 2 3 fb gnd dnc* 5 4 out in *do not connect s5 part marking lbdv lbdv lbdv lt6650cs5 lt6650is5 lt6650hs5 electrical characteristics the denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v in = 5v, c in = 1 f, fb = out, no dc load, c l = 1 f, unless otherwise noted. symbol parameter conditions min typ max units v out output voltage (notes 4, 5) lt6650 398 400 402 mv C0.5 0.5 % lt6650cs5 397 400 403 mv C0.75 0.75 % lt6650is5 396 400 404 mv C1 1 % lt6650hs5 394 400 406 mv C1.5 1.5 % v in operating input voltage 1.4 18 v ? v out / ? v in line regulation 1.4v v in 18v 16 mv 150 900 ppm/v lt6650cs5, lt6650is5 7.5 mv 1130 ppm/v lt6650hs5 8.5 mv 1280 ppm/v ? v out / ? i out load regulation (note 6) sourcing from 0 a to C200 a C0.04 C0.2 mv 500 2500 ppm/ma C0.4 mv 5000 ppm/ma sinking from 0 a to 200 a 0.24 1 mv 3000 12500 ppm/ma 2mv 20000 ppm/ma 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/
lt6650 3 6650fa t c output voltage temperature 30 ppm/ c coefficient (note 10) ? v do dropout voltage (note 7) referred to v in = 1.8v, v out = 1.4v (r f = 100k, r g = 39.2k) ? v out = C0.1%, i out = 0 a 75 100 mv 150 mv ? v out = C0.1%, i out = C200 a sourcing 165 250 mv 350 mv ? v out = C0.1%, i out = 200 a sinking (note 11) C300 C150 mv 0mv i sc short-circuit output current v out shorted to gnd 5 ma v out shorted to v in 9ma i in supply current 5.6 11 a 14 a v in = 18v 5.9 12 a 15 a i fb fb pin input current v fb = v out = 400mv 1.2 10 na lt6650cs5, lt6650is5 15 na lt6650hs5 30 na t on turn-on time c load = 1 f 0.5 ms e n output noise (note 8) 0.1hz ? 10hz 20 v p-p 10hz ? 1khz, i out = C200 a sourcing 23 v rms v hys hysteresis (note 9) ? t = 0 c to 70 c 0.1 mv 250 ppm ? t = C40 c to 85 c 0.24 mv 600 ppm note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: the fb pin is protected by an esd diode to the ground. if the fb input voltage exceeds C0.3v below ground, the fb input current should be limited to less than 10ma. if the fb input voltage is greater than 5v, the fb input current is expected to meet specified performance from typical performance characteristics but is not tested or qa sampled at this voltage. note 3: if the part is operating at temperatures above 85 c, it is recommended to enhance the stability margin by using an output capacitor greater than 10 f or a series rc combination having a 100 s equivalent time constant. see application section for details. note 4: if the part is stored outside of the specified temperature range, the output voltage may shift due to hysteresis. note 5: esd (electrostatic discharge) sensitive devices. extensive use of esd protection devices are used internal to the lt6650; however, high electrostatic discharge can damage or degrade the device. use proper esd handling precautions. electrical characteristics the denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v in = 5v, c in = 1 f, fb = out, no dc load, c l = 1 f, unless otherwise noted. symbol parameter conditions min typ max units note 6: load regulation is measured on a pulse basis from no load to the specified load current. output changes due to die temperature change must be taken into account separately. note 7: dropout voltage is (v in C v out ) when v out falls to 0.1% below its nominal value at v in = 1.8v. note 8: peak-to-peak noise is measured with a single pole highpass filter at 0.1hz and a 2-pole lowpass filter at 10hz. the unit is enclosed in a still air environment to eliminate thermocouple effects on the leads. the test time is 10 seconds. note 9: hysteresis in the 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 25 c, but the ic is cycled to 85 c or C40 c before a successive measurement. hysteresis is roughly proportional to the square of the temperature change. note 10: temperature coefficient is measured by dividing the change in output voltage by the specified temperature range. note 11: this feature guarantees the shunt mode operation of the device.
lt6650 4 6650fa input voltage (v) 0 supply current ( a) 6 8 10 16 6650 g03 4 2 0 4 8 12 20 14 2 6 10 18 125 c C55 c 25 c temperature ( c) C60 output voltage (mv) 404 403 402 400 401 399 398 397 396 100 6650 g01 C20 C40 0 40 80 120 20 60 typical part v in = 1.4v v in = 5v v in = 18v temperature ( c) C60 output voltage (mv) 403 402 400 401 399 398 100 6650 g02 C20 C40 0 40 80 120 20 60 three parts v in = 5v input voltage (v) 0 supply current ( a) 6 8 10 1.6 6650 g04 4 2 0 0.4 0.8 1.2 2.0 1.4 0.2 0.6 1.0 1.8 125 c C55 c 25 c input voltage (v) 2 398 output voltage (mv) 399 400 401 402 610 14 18 6550 g05 403 404 48 12 16 t a = 125 c t a = C55 c t a = 25 c input voltage (v) 0.8 398 output voltage (mv) 399 400 401 402 1.2 1.6 2.0 1.8 6650 g06 403 404 1.0 1.4 t a = 125 c t a = C55 c t a = 25 c output current ( a) 10 output voltage change ( v) 0 C10 C20 C30 C40 C50 C60 C70 C80 C90 C100 100 1000 6650 g07 typical part v in = 5v 125 c C55 c 25 c output current ( a) 10 output voltage change ( v) 1000 900 800 700 600 500 400 300 200 100 0 100 1000 6650 g08 typical part v in = 5v 125 c C55 c 25 c output current ( a) 10 input-output voltage (mv) 500 400 300 200 100 0 100 1000 6650 g09 v out = 1.425v - typ (rf = 100k, rg = 39.2k) 0.1% v out 125 c C55 c 25 c output voltage temperature drift output voltage temperature drift supply current vs input voltage line regulation line regulation load regulation (sourcing) load regulation (sinking) minimum input-output voltage differential (sourcing) typical perfor a ce characteristics uw (see applications, figure 1) supply current vs input voltage
lt6650 5 6650fa minimum input-output voltage differential (sinking) output short-circuit current vs input voltage output short-circuit current vs input voltage fb pin current vs fb pin voltage fb pin current vs fb pin voltage gain and phase vs frequency output noise 0.1hz to 10hz output voltage noise spectrum integrated noise 10hz to 1khz output current( a) 10 100 1000 input-output voltage (mv) 0 C400 C300 C200 C100 C500 6650 g10 v out = 1.425v - typ (rf = 100k, rg = 39.2k) 0.1% v out 125 c C55 c 25 c input voltage (v) 0 output current (ma) 6 8 14 12 10 16 6650 g11 4 2 4 8 12 20 14 2 6 10 18 output shorted to gnd 125 c C55 c 25 c input voltage (v) 0 output current (ma) 6 8 14 12 10 16 6650 g12 4 2 4 8 12 20 14 2 6 10 18 output shorted to v in 125 c 25 c C55 c fb pin voltage (v) C0.6 C10 fb pin current (na) 0 2 4 6 C0.2 0.2 0.6 1.0 6650 g13 8 C2 C4 C6 C8 10 C0.4 0 0.4 0.8 125 c v fb v out current is positive when it enters the device C55 c 25 c fb pin voltage (v) 13 79 515 13 11 17 19 fb pin current (na) 10 1 0.1 0.01 6650 g14 125 c v fb v out current is positive when it enters the device C55 c 25 c frequency (khz) gain (db) 120 100 80 60 40 20 00 C20 C40 phase (deg) 120 100 80 60 40 20 C20 C40 0.01 1 10 100 6650 g15 0.1 t a = 25 c unity gain r l = 2k c l = 1 f gain phase time (s) 0 output noise (5 v/div) 8 6650 g16 2 4 6 10 7 1 3 5 9 v in = 5v frequency (hz) 10 noise level ( v/ hz) 20 100 1k 10k 6650 g17 v in = 5v c l = 1 f i out = C40 a i out = 0 a 0 5 10 15 i out = C200 a frequency (hz) 10 1 integrated noise ( v rms ) 10 100 100 1k 6650 g18 v in = 5v c l = 1 f i out = C200 a typical perfor a ce characteristics uw (see applications, figure 1)
lt6650 6 6650fa typical perfor a ce characteristics uw output impedance vs frequency output impedance vs frequency output impedance vs frequency power supply rejection ratio vs frequency power supply rejection ratio vs frequency power supply rejection ratio vs frequency power supply rejection ratio vs frequency power supply rejection ratio vs frequency power supply rejection ratio vs frequency frequency (hz) 10 output impedance ( ? ) 100 10 1k 10k 100k 6650 g19 1 100 1000 c l = 1 f c l = 10 f c l = 47 f i out = 0 a r z = 0 ? frequency (hz) 10 output impedance ( ? ) 100 10 1k 10k 100k 6650 g20 1 100 1000 c l = 1 f c l = 10 f c l = 47 f i out = C40 a r z = 0 ? frequency (hz) 10 output impedance ( ? ) 100 10 1k 10k 100k 6650 g21 1 100 1000 c l = 1 f c l = 10 f c l = 47 f i out = 0 a c l ? r z = 100 s frequency (hz) power supply rejection ratio (db) 20 10 0 C10 C20 C30 C40 C50 C60 C70 C80 10 1k 10k 100k 6650 g22 100 c l = 1 f c l = 10 f c l = 47 f i out = 0 a r z = 0 ? frequency (hz) power supply rejection ratio (db) 20 10 0 C10 C20 C30 C40 C50 C60 C70 C80 10 1k 10k 100k 6650 g23 100 c l = 1 f c l = 10 f c l = 47 f i out = C40 a r z = 0 ? frequency (hz) power supply rejection ratio (db) 20 10 0 C10 C20 C30 C40 C50 C60 C70 C80 10 1k 10k 100k 6650 g24 100 c l = 1 f c l = 10 f c l = 47 f i out = 0 a c l ? r z = 100 s frequency (hz) power supply rejection ratio (db) 20 10 0 C10 C20 C30 C40 C50 C60 C70 C80 10 1k 10k 100k 6650 g25 100 c l = 1 f c l = 10 f c l = 47 f i out = 0 a r z = 0 ? c in = 1 f r in = 1k frequency (hz) power supply rejection ratio (db) 20 10 0 C10 C20 C30 C40 C50 C60 C70 C80 10 1k 10k 100k 6650 g26 100 c l = 1 f c l = 10 f c l = 47 f i out = C40 a r z = 0 ? c in = 1 f r in = 1k frequency (hz) power supply rejection ratio (db) 20 10 0 C10 C20 C30 C40 C50 C60 C70 C80 10 1k 10k 100k 6650 g27 100 c l = 1 f c l = 10 f c l = 47 f i out = 0 a c l ? r z = 100 s c in = 1 f r in = 1k (see applications, figure 1)
lt6650 7 6650fa applicatio s i for atio wu u u pi fu ctio s uuu block diagra w fb (pin 1): resistor divider feedback pin. connect a resistor divider from out to gnd and the center tap to fb. this pin sets the output potential. gnd (pin 2): ground connection. dnc (pin 3): do not connect. connected internally for post package trim. this pin must be left unconnected. in (pin 4): positive supply. bypassing with a 1 f capacitor is recommended if the output loading changes. out (pin 5): reference output. the output sources and sinks current. it is stable with any load capacitor with a total capacitance of 1 f or more. higher load capacitance improves load transient response. out dnc fb in gnd lt6650 C + v r = 400mv reference 6650 bd 4 2 3 5 1 long battery life the lt6650 is a micropower, adjustable reference which operates from supply voltages ranging from 1.4v to 18v. the series regulated output may be configured with exter- nal resistors to any voltage from 400mv to nearly the supply potential. under no-load conditions, the lt6650 dissipates only 8 w when operating on a 1.4v supply. other operating configurations allow the lt6650 to be used as a micropower positive or negative adjustable shunt reference from 1.4v to 18v. bypass and load capacitor the lt6650 voltage reference requires a 1 f or greater output capacitance for proper operation. this capacitance may be provided by either a single capacitor connected between out and gnd or formed by the aggregate of several capacitors that may be serving other decoupling functions. output impedance can be reduced by dc load- ing of the output by 40 a to 200 a, and/or adding an r z to the output capacitor for a 100 s time constant as shown in figure 1 and the typical performance characteristics graphs. the lt6650 voltage reference should have an input by- pass capacitor of 0.1 f or larger. when the circuit is figure 1. lt6650 input-output configuration v out v in out in r in fb gnd lt6650 6650 f01 2 4 5 1 c l r z c in
lt6650 8 6650fa operated from a small battery or other relatively high impedance source, a minimum 1 f capacitor is recom- mended. psrr can be significantly enhanced by adding a low-pass rc filter on the input, with a time-constant of 1ms or higher, as shown in figure 1. the typical perfor- mance characteristics graphs show performance as a function of several combinations of input and output capacitance. an input rc of 100ms or more is recommended (such as 5k and 22 f) when output transients must be minimized in the face of high supply noise, such as in automotive applications. figure 2 shows an input filter structure that effectively eliminates supply transients from affecting the output. with this extra input decoupling and the lt6650 operating normally from a 12v bus, 50v transients induce less than <0.5% v out perturbations. figure 3 shows the turn-on response time for the circuit in figure 1. the input voltage steps from 0v to 3v, and the output is configured to produce 400mv. input bypass and output load capacitance are 1 f, r in = 0 ? , r z = 0 ? , and the output settles in approximately 0.5ms. figure 4 shows applicatio s i for atio wu u u figure 2. high noise-immunity input network figure 3. lt6650 turn-on characteristic figure 4. output response to 0.5v input step figure 5. output response to bidirectional load step (100 a to ?00 a) figure 6. output response to current-sourcing load step (?00 a to ?00 a) v in 4.7k noisy power bus 6650 f02 22 f 1n751 5v 33k 1 f the same circuit responding to input transients of 0.5v, settling in about 0.3ms. figures 5 through 7 show the same circuit responding to various load steps: changes between 100 a in figure 5; sourcing current step be- tween C100 a and C200 a in figure 6; and sinking current 6650 f05 v out 10mv/div i out sinking sourcing 100 a sinking 100 a sourcing 6650 f06 v out 10mv/div ac i out C100 a C200 a v out 0.2ms/div 6650 f03 v in 3v 0v 0.4v 0v 2ms/div 6650 f04 v in v out 3v 2.5v 0.4v 0v
lt6650 9 6650fa figure 9. typical configuration of lt6650 as adjustable positive shunt reference figure 10. typical configuration of lt6650 as adjustable negative shunt reference applicatio s i for atio wu u u step between 100 a and 200 a in figure 7. load step settling occurs in about 0.5ms or less (to 0.2%). output adjustment if the lt6650 is to be used as a 400mv reference, then the output and feedback pins may be tied together without any scale-setting components as shown in the front-page application circuit. setting the output to any higher voltage is a simple matter of selecting two feedback resistors to configure the non-inverting gain of the internal operational amplifier, as shown in figure 8. a feedback resistor r f is connected between the out pin and the fb pin, and a gain resistor r g is connected from the fb pin to gnd. the resistor values are related to the output voltage by the following relationship: r f = r g ? (v out C 0.4)/(0.4 C i fb ? r g ) the i fb term represents the fb pin bias current, and can generally be neglected when r g is 100k or less. for r g 20k, even worst-case i fb can be neglected (error contribution <0.15%). since the v out error distribution increases at twice the resistor tolerance, high accuracy resistors or resistor networks are recommended. the output voltage may be set to any level from 400mv up to 350mv below the supply voltage with source or sink capability. noise reduction capacitor in applications involving the use of resistive feedback for reference scaling, the intrinsic reference noise is amplified along with the dc level. to minimize noise amplification, the use of a 1nf feedback capacitor is recommended, as shown in figure 8 and other circuits with scaling resistors. shunt reference operation the circuits shown in figure 9 and figure 10 form adjust- able shunt references. along with the external bias resistor r b , the lt6650 provides positive or negative reference operation for outputs between 1.4v and 18v (positive or negative). just like a zener diode, a supply v s is required, somewhat higher in magnitude than the desired reference v out 6650 f09 10 f out in fb gnd lt6650 2 45 1 v s r f r b r g 1nf v out = 0.4v ? (1 + r f / r g ) v out 6650 f10 10 f out in fb gnd lt6650 2 45 1 r f Cv s r b r g 1nf v out = C0.4v ? (1 + r f / r g ) figure 8. typical configuration for output voltages greater than 0.4v v out 6650 f08 1 f 1 f 1nf out in fb gnd lt6650 2 45 1 v s 1k r f r g v out = 0.4v ? (1 + r f / r g ) figure 7. output response to current-sinking load step (100 a to 200 a) 6650 f07 v out 10mv/div ac i out 200 a 100 a
lt6650 10 6650fa applicatio s i for atio wu u u figure 11. worst-case 0 c to 70 c hysteresis figure 12. worst-case ?0 c to 85 c hysteresis v out . r b must be within the following range for proper operation (the optimal value depends greatly on the direc- tion and magnitude of the load current): r b > |v s C v out |/(200 a + 0.4/r g ) r b < |v s C v out |/(15 a + 0.4/r g ) hysteresis due to various mechanical stress mechanisms inherent to integrated-circuit packaging, internal offsets may not pre- cisely recover from variations that occur over tempera- ture, and this effect is referred to as hysteresis. proprietary manufacturing steps minimize this hysteresis, though some small residual error can occur. hysteresis measure- ments for the lt6650 can be seen in figures 11 and 12. figure 11 presents the worst-case data taken on parts subjected to thermal cycling between 0 c to 70 c, while figure 12 shows data for C40 c to 85 c cycling. units were cycled several times over these temperature ranges and the largest changes are shown. as would be expected, the parts cycled over the higher temperature extremes exhibit a broader hysteresis distribution. the worst hys- teresis measurements indicate voltage shifts of less than 1000ppm (0.1%) from their initial value. limits of operation the lt6650 is a robust bipolar technology part. esd clamp diodes are integrated into the design and are depicted in the simplified schematic for reference. diodes are included between the gnd pin and the in, out, and fb pins to prevent reverse voltage stress on the device. unusual modes of operation that forward-bias any these diodes should limit current to 10ma to avoid permanent damage to the device. the lt6650 is fabricated using a relatively high-voltage process, allowing any pin to inde- pendently operate at up to 20v with respect to gnd. the part does not include any over voltage protection mecha- nisms; therefore caution should be exercised to avoid inadvertent application of higher voltages in circuits in- volving high potentials. distribution (ppm) C400 number of units 2 3 6 5 4 400 6650 f11 1 0 C200 0 200 600 light columns 0 c to 25 c dark columns 70 c to 25 c distribution (ppm) C1000 number of units 2 3 6 5 4 500 6650 f12 7 1 0 C500 1000 250 C750 C250 0 750 light columns C40 c to 25 c dark columns 85 c to 25 c
lt6650 11 6650fa package descriptio u sche atic w w si plified 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. 1.50 C 1.75 (note 4) 2.80 bsc 0.30 C 0.45 typ 5 plcs (note 3) datum a 0.09 C 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 C 0.90 1.00 max 0.01 C 0.10 0.20 bsc 0.30 C 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 s5 package 5-lead plastic tsot-23 (reference ltc dwg # 05-08-1635 rev b) in fb gnd out 6650 ss 4 5 2 1 in in in
lt6650 12 6650fa 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/lt 1005 ?printed in usa related parts typical applicatio u part number description comments lt1790 micropower ldo precision reference 0.05% max sources/sinks-current available in sot-23 lt1460 micropower precision reference 0.075% max 10ppm/oc available in sot-23 lt1461 micropower ldo low tc precision reference 0.04% max 3ppm/oc 35 a supply current lt1494/lt1495/ single/dual/quad micropower op amps 1.5 a, v os < 375 v, i b < 1000pa lt1496 ltc1540 nanopower comparator with reference 300na, available in 3mm 3mm dfn package ltc1798 micropower ldo reference 0.15% max 6.5 a supply current lt6700 micropower dual comparator with reference 6.5 a, choice of polarities available in sot-23 anode cathode anode cathode 6650 ta02 10 f 1.4v v z 18v 30 a i z 220 a v z = 0.4v ? (1 + r f /r g ) = out in fb gnd lt6650 2 45 1 r f r g 1nf adjustable micropower ?ener?2-terminal reference

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