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ltc6652 1 6652fc features applications description precision low drift low noise buffered reference the ltc ? 6652 family of precision, low drift, low noise references is fully speci? ed over the temperature range of C 40c to 125c. high order curvature compensation allows these references to achieve a low drift of less than 5ppm/c with a predictable temperature characteristic and an output voltage accuracy of 0.05%. the performance over temperature should appeal to automotive, high- performance industrial and other high temperature applications. the ltc6652 voltage references can be powered from a 13.2v supply or as little as 300mv above the output voltage or 2.7v; whichever is higher. the ltc6652 references are offered in an 8-lead msop package. they boast low noise, excellent load regulation, source and sink capability and exceptional line rejection, making them a superior choice for demanding precision applications. a shutdown mode allows power consumption to be reduced when the reference is not needed. the optional output capacitor can be left off when space constraints are critical. output voltage temperature drift n low drift: a grade 5ppm/c max b grade 10ppm/c max n high accuracy: a grade 0.05%, b grade 0.1% n low noise: 2.1ppm p-p (0.1hz to 10hz) n 100% tested at C40c, 25c and 125c n sinks and sources current: 5ma n low power shutdown: <2a maximum n thermal hysteresis: 105ppm for C 40c to 125c range n low dropout: 300mv n no external load capacitor required n wide supply range to 13.2v n available output voltage options: 1.25v, 2.048v, 2.5v, 3v, 3.3v, 4.096v, 5v n 8-lead msop package n automotive control and monitoring n high temperature industrial n high resolution data acquisition systems n instrumentation and process control n precision regulators n medical equipment basic connection typical application temperature (c) C40 C0.050 v out accuracy (%) C0.025 0 0.025 0.050 C20 0 20 40 6652 ta01b 60 80 100 125 2.8v b v in b 13.2v c in 0.1 m f (optional) c out 1 m f (optional) v out 2.5v 6652 ta01a ltc6652-2.5 v out v in gnd shdn l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners.
ltc6652 2 6652fc absolute maximum ratings input voltage v in to gnd .......................................... C0.3v to 13.2v shdn to gnd ............................C0.3v to (v in + 0.3v) output voltage v out ...........................................C0.3v to (v in + 0.3v) output short-circuit duration ...................... inde? nite operating temperature range ................ C40c to 125c storage temperature range (note 2) ..... C65c to 150c lead temperature range (soldering, 10 sec) (note 9)............................................................. 300c (note 1) output voltage initial accuracy temperature coefficient part number** 1.250 0.05% 0.1% 5ppm/c 10ppm/c ltc6652ahms8-1.25 ltc6652bhms8-1.25 2.048 0.05% 0.1% 5ppm/c 10ppm/c ltc6652ahms8-2.048 ltc6652bhms8-2.048 2.500 0.05% 0.1% 5ppm/c 10ppm/c ltc6652ahms8-2.5 ltc6652bhms8-2.5 3.000 0.05% 0.1% 5ppm/c 10ppm/c ltc6652ahms8-3 ltc6652bhms8-3 3.300 0.05% 0.1% 5ppm/c 10ppm/c ltc6652ahms8-3.3 ltc6652bhms8-3.3 4.096 0.05% 0.1% 5ppm/c 10ppm/c ltc6652ahms8-4.096 ltc6652bhms8-4.096 5.000 0.05% 0.1% 5ppm/c 10ppm/c ltc6652ahms8-5 ltc6652bhms8-5 **see order information section for complete part number listing. 1 2 3 4 dnc v in shdn gnd 8 7 6 5 gnd* gnd* v out gnd* top view ms8 package 8-lead plastic msop t jmax = 150c, ja = 200c/w dnc: do not connect *connect the pins to device gnd (pin 4) order information lead free finish tape and reel part marking* package description temperature range ltc6652ahms8-1.25#pbf ltc6652ahms8-1.25#trpbf ltcvh 8-lead plastic msop C40c to 125c ltc6652bhms8-1.25#pbf ltc6652bhms8-1.25#trpbf ltcvh 8-lead plastic msop C40c to 125c ltc6652ahms8-2.048#pbf ltc6652ahms8-2.048#trpbf ltcvj 8-lead plastic msop C40c to 125c ltc6652bhms8-2.048#pbf ltc6652bhms8-2.048#trpbf ltcvj 8-lead plastic msop C40c to 125c ltc6652ahms8-2.5#pbf ltc6652ahms8-2.5#trpbf ltcqv 8-lead plastic msop C40c to 125c ltc6652bhms8-2.5#pbf ltc6652bhms8-2.5#trpbf ltcqv 8-lead plastic msop C40c to 125c ltc6652ahms8-3#pbf ltc6652ahms8-3#trpbf ltcvk 8-lead plastic msop C40c to 125c ltc6652bhms8-3#pbf ltc6652bhms8-3#trpbf ltcvk 8-lead plastic msop C40c to 125c ltc6652ahms8-3.3#pbf ltc6652ahms8-3.3#trpbf ltcvm 8-lead plastic msop C40c to 125c ltc6652bhms8-3.3#pbf ltc6652bhms8-3.3#trpbf ltcvm 8-lead plastic msop C40c to 125c ltc6652ahms8-4.096#pbf ltc6652ahms8-4.096#trpbf ltcvn 8-lead plastic msop C40c to 125c ltc6652bhms8-4.096#pbf ltc6652bhms8-4.096#trpbf ltcvn 8-lead plastic msop C40c to 125c ltc6652ahms8-5#pbf ltc6652ahms8-5#trpbf ltcvp 8-lead plastic msop C40c to 125c ltc6652bhms8-5#pbf ltc6652bhms8-5#trpbf ltcvp 8-lead plastic msop C40c to 125c consult ltc marketing for parts speci? ed with wider operating temperature ranges. *the temperature grade is identi? ed by a label on the shipping container. consult ltc marketing for information on non-standard 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/ pin configuration available options
ltc6652 3 6652fc electrical characteristics parameter conditions min typ max units output voltage ltc6652a ltc6652b C0.05 C0.1 0.05 0.1 % % output voltage temperature coef? cient (note 3) ltc6652a ltc6652b l l 2 4 5 10 ppm/c ppm/c line regulation v out + 0.5v v in 13.2v, shdn = v in l 250 80 ppm/v ppm/v load regulation (note 4) i source = 5ma, ltc6652-1.25, ltc6652-2.048, ltc6652-2.5, ltc6652-3, ltc6652-3.3, ltc6652-4.096, ltc6652-5 l 20 75 200 ppm/ma ppm/ma i sink = 1ma, ltc6652-1.25, ltc6652-2.048 l 80 250 600 ppm/ma ppm/ma i sink = 5ma, ltc6652-2.5, ltc6652-3, ltc6652-3.3, ltc6652-4.096, ltc6652-5 l 50 150 450 ppm/ma ppm/ma minimum operating voltage (note 5) i source = 5ma, v out error 0.1% ltc6652-1.25, ltc6652-2.048 ltc6652-2.5, ltc6652-3, ltc6652-3.3, ltc6652-4.096, ltc6652-5 l l 2.7 v out + 0.3v v v output short-circuit current short v out to gnd short v out to v in 16 16 ma ma shutdown pin ( shdn ) logic high input voltage logic high input current l l 2 0.1 1 v a logic low input voltage logic low input current l l 0.1 0.8 1 v a supply current no load l 350 560 a a shutdown current shdn tied to gnd l 0.1 2 a output voltage noise (note 6) 0.1hz f 10hz ltc6652-1.25 ltc6652-2.048, ltc6652-2.5, ltc6652-3 ltc6652-3.3 ltc6652-4.096 ltc6652-5 10hz f 1khz 2.4 2.1 2.2 2.3 2.8 3 ppm p-p ppm p-p ppm p-p ppm p-p ppm p-p ppm rms turn-on time 0.1% settling, c load = 0 100 s long-term drift of output voltage (note 7) 60 ppm/ khr hysteresis (note 8) t = C40c to 125c 105 ppm the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c, v in = v out + 0.5v, unless otherwise noted. 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 parts are stored outside of the speci? ed temperature range, the output may shift due to hysteresis. note 3: temperature coef? cient is measured by dividing the maximum change in output voltage by the speci? ed temperature range. note 4: load regulation is measured on a pulse basis from no load to the speci? ed load current. output changes due to die temperature change must be taken into account separately. note 5: excludes load regulation errors. note 6: peak-to-peak noise is measured with a 3-pole highpass at 0.1hz and 4-pole lowpass ? lter at 10hz. the unit is enclosed in a still-air environment to eliminate thermocouple effects on the leads. the test time is 10 seconds. rms noise is measured on a spectrum analyzer in a shielded environment where the intrinsic noise of the instrument is removed to determine the actual noise of the device. note 7: long-term stability typically has a logarithmic characteristic and therefore, changes after 1000 hours tend to be much smaller than before that time. total drift in the second thousand hours is normally less than one third that of the ? rst thousand hours with a continuing trend toward reduced drift with time. long-term stability will also be affected by differential stresses between the ic and the board material created during board assembly. note 8: 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 the hot or cold temperature limit before successive measurements. hysteresis is roughly proportional to the square of the temperature change. for instruments that are stored at well controlled temperatures (within 20 or 30 degrees of operational temperature) its usually not a dominant error source. note 9: the stated temperature is typical for soldering of the leads during manual rework. for detailed ir re? ow recommendations, refer to the applications section.
ltc6652 4 6652fc frequency (khz) 0.01 noise voltage (nv/ hz ) 0.1 1 10 6652 g22 300 200 100 0 400 time (1 second/div) output noise (1v/div) 6652 g21 input voltage (v) 0 output voltage (v) 1.2502 1.2504 1.2506 610 6652 g18 1.2500 1.2498 24 81214 1.2496 1.2494 125c C40c 25c typical performance characteristics 1.25v load regulation (sinking) 1.25v low frequency 0.1hz to 10hz transient noise 1.25v output voltage noise spectrum 1.25 sinking current without output capacitor 1.25 sinking current with output capacitor 1.25v output voltage temperature drift 1.25v load regulation (sourcing) 1.25v line regulation temperature (c) C80 reference voltage (v) 1.2500 1.2505 1.2510 40 160 6652 g17 1.2495 1.2490 C40 0 80 120 3 typical parts output current (ma) 0.1 C250 C200 output voltage change (ppm) C150 C100 0 1 6652 g19 C50 10 125 o c 25 o c C40 o c output current (ma) 0.1 0 output voltage change (ppm) 100 200 300 50 150 250 350 400 110 C40c 125c 6652 g20 25c 500s/div v out 500mv/div c out = 0f i out 1ma 0ma 6652 g23 500s/div v out 500mv/div c out = 1f i out 1ma 0ma 6652 g24 load current (ma) no cap output capacitor 100pf 1nf 10nf 0.1f 1f 10f C5 C1 0 5 6652 g16 region of marginal stability 1.25v stability with output capacitance characteristic curves are similar for most ltc6652s. curves from the ltc6652-1.25, ltc6652-2.5 and the ltc6652-5 represent the extremes and typical of the voltage options . characteristic curves for other output voltages fall between these curves and can be estimated based on their output.
ltc6652 5 6652fc typical performance characteristics 2.5v output voltage temperature drift 2.5v load regulation (sourcing) 2.5v load regulation (sinking) 2.5v supply current vs input voltage 2.5v shutdown current vs input voltage 2.5v minimum v in -v out differential (sourcing) temperature (c) C50 reference voltage (v) 2.5000 2.5005 2.5010 25 75 150 6652 g01 2.4995 2.4990 2.4985 C25 0 50 100 125 3 typical parts input voltage (v) 0 output voltage (v) 2.5000 2.5005 2.5010 610 6652 g02 2.4995 2.4990 24 81214 2.4985 2.4980 125c C40c 25c output current (ma) 0.1 C200 output voltage change (ppm) C180 C140 C120 C100 0 C60 1 6652 g03 C160 C40 C20 C80 10 125 c 25 c C40 c output current (ma) 0.1 0 output voltage change (ppm) 100 200 400 500 600 700 110 C40c 125c 25c 6652 g04 input voltage (v) 0 0 supply current (a) 100 300 400 500 1000 700 4 8 10 6652 g05 200 800 900 600 2 6 12 125c C40c 14 25c input voltage (v) 0 0 supply current (a) 0.1 0.3 0.4 0.5 1.0 0.7 4 8 10 6652 g06 0.2 0.8 0.9 0.6 2 6 12 14 125c 25c C40c input-output voltage (v) 0.001 0.01 output current (ma) 1 10 0.01 0.1 1 6652 g09 0.1 25c 125c, C40c 2.5v line regulation characteristic curves are similar for most ltc6652s. curves from the ltc6652-1.25, ltc6652-2.5 and the ltc6652-5 represent the extremes and typical of the voltage options . characteristic curves for other output voltages fall between these curves and can be estimated based on their output. 2.5v minimum v out -v in differential (sinking) output-input voltage (v) 0.001 output current (ma) 10 0.01 0.1 1 6652 g10 1 0.1 25c C40c 125c
ltc6652 6 6652fc typical performance characteristics typical v out distribution for ltc6652-2.5 stability with output capacitance (ltc6652-2.5, ltc6652-3, ltc6652-3.3, ltc6652-4.096, ltc6652-5) 2.5v low frequency 0.1hz to 10hz transient noise 2.5v output voltage noise spectrum time (1 second/div) output noise (1v/div) 6652 g11 frequency (khz) 0.01 noise voltage (nv/ hz ) 0.1 1 10 6652 g12 300 200 100 0 600 500 400 output voltage (v) 2.4985 0 number of units 40 60 80 180 140 2.5005 6652 g15 20 160 120 2.4995 2.5015 ltc6652a limits 1004 units load current (ma) no cap output capacitor 100pf 1nf 10nf 0.1f 1f 10f C5 0 5 6652 g14 region of marginal stability characteristic curves are similar for most ltc6652s. curves from the ltc6652-1.25, ltc6652-2.5 and the ltc6652-5 represent the extremes and typical of the voltage options . characteristic curves for other output voltages fall between these curves and can be estimated based on their output.
ltc6652 7 6652fc frequency (khz) 0.01 noise voltage (nv/ hz ) 0.1 1 10 6652 g32 200 0 1000 800 600 400 time (1 second/div) output noise (5v/div) 6652 g31 input voltage (v) 0 0 supply current (a) 0.1 0.3 0.4 0.5 1.0 0.7 4 8 10 6652 g29 0.2 0.8 0.9 0.6 2 6 12 14 125c C40c 25c typical performance characteristics 5v shutdown current vs input voltage 5v minimum v in to v out differential (sourcing) 5v low frequency 0.1hz to 10hz transient noise 5v output voltage noise spectrum 5v start-up response without output capacitor 5v output voltage temperature drift 5v supply current vs input voltage 5v line regulation 5v start-up response with output capacitor characteristic curves are similar for most ltc6652s. curves from the ltc6652-1.25, ltc6652-2.5 and the ltc6652-5 represent the extremes and typical of the voltage options . characteristic curves for other output voltages fall between these curves and can be estimated based on their output. input voltage (v) 0 output voltage (v) 610 6652 g26 24 81214 125c C40c 25c 5.000 5.001 5.002 4.999 4.998 temperature (c) reference voltage (v) 5.000 5.003 5.005 6652 g25 4.998 4.995 C50 25 75 150 C25 0 50 100 125 3 typical parts input voltage (v) 0 0 supply current (a) 100 300 400 500 1000 700 4 8 10 6652 g27 200 800 900 600 2 6 12 14 125c C40c 25c input-output voltage (v) 0.001 0.01 output current (ma) 1 10 0.01 0.1 1 6652 g30 0.1 25c 125c C40c 100s/div v out 2v/div v in 2v/div c out = 0f 6652 g33 100s/div v out 2v/div v in 2v/div c out = 1f 6652 g34
ltc6652 8 6652fc pin functions dnc (pin 1): do not connect. v in (pin 2): power supply. the minimum supply input is v out + 300mv or 2.7v; whichever is higher. the maximum supply is 13.2v. bypassing v in with a 0.1f capacitor to gnd will improve psrr. shdn (pin 3): shutdown input. this active low input powers down the device to <2a. for normal operation tie this pin to v in . gnd (pin 4): device ground. v out (pin 6): output voltage. an output capacitor is not required. for some applications, a capacitor between 0.1f to 10f can be bene? cial. see the graphs in the typical performance characteristics section for further details. gnd (pins 5,7,8): internal function. ground these pins. typical performance characteristics characteristic curves are similar for most ltc6652s. curves from the ltc6652-1.25, ltc6652-2.5 and the ltc6652-5 represent the extremes and typical of the voltage options . characteristic curves for other output voltages fall between these curves and can be estimated based on their output. power supply rejection ratio vs frequency output impedance vs frequency frequency (khz) 0.01 C60 power supply rejection ratio (db) C50 C40 C30 C20 0.1 1 10 100 1000 6652 g07 C70 C80 C90 C100 C10 0 c out = 0f c out = 1f c out = 10f frequency (khz) 1 output impedance () 10 100 0.01 1 10 100 6652 g08 0.1 0.1 c out = 0f c out = 1f c out = 10f shdn input voltage thresholds vs v in v in (v) 2 v trip (v) 1.5 2.0 0.5 1.0 2.5 610 6652 g13 4 81214 0 v th(dn) v th(up)
ltc6652 9 6652fc bypass and load capacitors the ltc6652 voltage references do not require an input capacitor, but a 0.1f capacitor located close to the part improves power supply rejection. the ltc6652 voltage references are stable with or without a capacitive load. for applications where an output capaci- tor is bene? cial, a value of 0.1f to 10f is recommended depending on load conditions. the typical performance characteristics section includes a plot illustrating a region of marginal stability. either no or low value capacitors for any load current are acceptable. for loads that sink current or light loads that source current, a 0.1f to 10f capacitor has stable operation. for heavier loads that source current a 0.5f to 10f capacitor range is recommended. the transient response for a 0.5v step on v in with and without an output capacitor is shown in figures 2 and 3, respectively. the ltc6652 references with an output of 2.5v and above are guaranteed to source and sink 5ma. the 1.25v and 2.048v versions are guaranteed to source 5ma and sink 1ma. the test circuit for transient load step response is shown in figure 1. figures 4 and 5 show a 5ma source and sink load step response without a load capacitor, respectively. start-up the start-up characteristic of the ltc6652 is shown in figures 8 and 9. note that the turn-on time is affected by the value of the output capacitor. block diagram applications information v in shdn gnd v out 6652 bd bandgap 3 6 2 4 C + figure 1. transient load test circuit v in 3v 2, 3 6 100 4, 5, 7, 8 c in 0.1f c out 1f v gen 0.5v 6652 f01 ltc6652-2.5
ltc6652 10 6652fc applications information figure 2. transient response without output capacitor figure 3. transient response with 1f output capacitor figure 5. ltc6652-2.5 sinking current without output capacitor figure 6. ltc6652-2.5 sourcing current with output capacitor figure 4. ltc6652-2.5 sourcing current without output capacitor figure 7. ltc6652-2.5 sinking current with output capacitor 3.5v 3v v out 500mv/div 500 s/div 6652 f02 c out = 0 f v in 5ma 0ma v out 200mv/div 250 s/div 6652 f05 c out = 0 f i out 3.5v 3v v out 500mv/div 500 s/div 6652 f03 c out = 1 f v in v out 200mv/div 250 s/div 6652 f06 c out = 1 f 0ma C5ma i out 0ma C5ma v out 200mv/div 250 s/div 6652 f04 c out = 0 f i out 5ma 0ma v out 50mv/div 250 s/div 6652 f07 c out = 1 f i out
ltc6652 11 6652fc applications information figure 8. start-up response without output capacitor figure 9. start-up response with 1f output capacitor figure 10. open-drain shutdown circuit figure 11. shutdown response with 5ma load in figure 8, ripple momentarily appears just after the leading edge of powering on. this brief one time event is caused by calibration circuitry during initialization. when an output capacitor is used, the ripple is virtually undetect- able as shown in figure 9. shutdown mode shutdown mode is enabled by tying shdn low which places the part in a low power state (i.e., <2a). in shutdown mode, the output pin takes the value 20k ? (rated output voltage). for example, an ltc6652-2.5 will have an output impedance of 20k ? 2.5 = 50k. for normal operation, shdn should be greater than or equal to 2.0v. for use with a microcontroller, use a pull-up resistor to v in and an open-drain output driver as shown in figure 10. the ltc6652s response into and out of shutdown mode is shown in figure 11. the trip thresholds on shdn have some dependence on the voltage applied to v in as shown in the typical performance characteristics section. be careful to avoid leaving shdn at a voltage between the thresholds as this will likely cause an increase in supply current due to shoot-through current. long-term drift long-term drift cannot be extrapolated from acceler- ated high temperature testing. this erroneous technique gives drift numbers that are wildly optimistic. the only way long-term drift can be determined is to measure it over the time interval of interest. the ltc6652 long-term drift data was collected on more than 100 parts that were soldered into pc boards similar to a real world application. the boards were then placed into a constant temperature oven with t a = 35c, their outputs were scanned regularly and measured with an 8.5 digit dvm. long-term drift is shown below in figure 12. v in 2v/div v out 1v/div 100 s/div 6652 f08 c out = 0 f 2.8v b v in b 13.2v v out to c c1 1f c2 1f r1 20k 6652 f10 ltc6652-2.5 shdn 2n7002 v out v in gnd v in 2v/div v out 1v/div 100 s/div 6652 f09 c out = 1 f shdn 1v/div v out 1v/div 1ms/div 6652 f11 i load = 5ma
ltc6652 12 6652fc applications information figure 12. long-term drift hysteresis the hysteresis data shown in figure 13 represents the worst-case data collected on parts from C40c to 125c. the output is capable of dissipating relatively high power, i.e., for the lt6652-2.5, p d = 10.7v ? 5.5ma = 58.85mw. the thermal resistance of the ms8 package is 200c/w and this dissipation causes a 11.8c internal rise. this could increase the junction temperature above 125c and may cause the output to shift due to thermal hysteresis. pc board layout the mechanical stress of soldering a surface mount volt- age reference to a pc board can cause the output voltage to shift and temperature coef? cient to change. these two changes are not correlated. for example, the voltage may shift, but the temperature coef? cient may not. to reduce the effects of stress-related shifts, mount the reference near the short edge of the pc board or in a corner. in addition, slots can be cut into the board on two sides of the device. the capacitors should be mounted close to the package. the gnd and v out traces should be as short as possible to minimize i ? r drops. excessive trace resistance directly impacts load regulation. figure 13. hysteresis plot C40c to 125c ir re? ow shift the different expansion and contraction rates of the materi- als that make up the lead-free ltc6652 package cause the output voltage to shift after undergoing ir re? ow. lead-free re? ow pro? les reach over 250c, considerably more than their leaded counterparts. the lead-free ir re? ow pro? le used to experimentally measure output voltage shift in the ltc6652-2.5 is shown in figure 14. similar results can be expected using a convection re? ow oven. in our experiment, the serialized parts were run through the re? ow process twice. the results indicate that the standard deviation of the output voltage increases with a slight positive mean shift of 0.003% as shown in figure 15. while there can be up to 0.016% of output voltage shift, the overall drift of the ltc6652 after ir re? ow does not vary signi? cantly. power dissipation power dissipation in the ltc6652 is dependent on v in , load current, and package. the ltc6652 package has a thermal resistance, or ja , of 200c/w. a curve that illustrates allowed power dissipation vs temperature for this package is shown in figure 16. the power dissipation of the ltc6652-2.5v as a function of input voltage is shown in figure 17. the top curve shows power dissipation with a 5ma load and the bottom curve shows power dissipation with no load. hours 0 ppm 60 80 900 6652 f12 40 C20 20 300 600 1200 1500 C40 0 ltc6652-2.5 ms8 package 3 typical parts t a = 35 o c distribution (ppm) C250 C150 C50 0 number of units 5 10 15 35 25 6652 f13 30 20 150 50 125 c to 25 c C40 c to 25 c
ltc6652 13 6652fc applications information when operated within its speci? ed limits of v in = 13.2v and sourcing 5ma, the ltc6652-2.5 consumes just under 60mw at room temperature. at 125c the quiescent cur- rent will be slightly higher and the power consumption figure 16. maximum recommended dissipation for ltc6652 figure 17. typical power dissipation of the ltc6652 temperature ( c ) 0 0 dissipation (w) 0.2 0.6 0.1 80 0.7 6652 f16 0.4 0.3 0.5 40 20 100 120 60 140 v in (v) 2 0 power (w) 0.01 0.03 0.04 0.05 0.06 6652 f17 0.02 6 4 10 12 814 t a = 25c 5ma load no load increases to just over 60mw. the power-derating curve in figure 16 shows the ltc6652-2.5 can safely dissipate 125mw at 125c about half the maximum power con- sumption of the package. figure 14. lead-free re? ow pro? le figure 15. output voltage shift due to ir re? ow output voltage shift due to ir reflow (%) C0.014 C0.006 0 number of units 4 2 6 10 8 6652 f15 0.018 0.010 0.002 0246 minutes 8 0 75 150 225 300 6652 f14 10 120s 40s t p 30s t p = 260c ramp down ramp to 150c t s = 190c t = 150c t l 130s t l = 217c t s(max) = 200c 380s
ltc6652 14 6652fc package description ms8 package 8-lead plastic msop (reference ltc dwg # 05-08-1660 rev f) typical applications extended supply range reference extended supply range reference boosted output current 4v to 30v v out bzx84c18 c1 0.1f c2 optional r1 6652 ta02 ltc6652-2.5 v out v in gnd shdn 6v to 160v v out bzx84c18 c1 0.1f c2 optional r1 330k on semi mmbt5551 r2 4.7k 6652 ta03 ltc6652-2.5 v out v in gnd shdn v + r (v out + 1.8v) v out c1 1f c2 1f r1 220 7 6652 ta04 ltc6652-2.5 2n2905 v out v in gnd shdn negative rail circuit v ee C3v v cc 1.75v v out C2.5v 4, 5, 7, 8 2, 3 6 1f 500 6652 ta06 c1 0.1f ltc6652-2.5 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 o C 6 o 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
ltc6652 15 6652fc 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 11/09 change to typical performance characteristics change to typical application 6 14 (revision history begins at rev c)
ltc6652 16 6652fc linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2007 lt 1109 rev c ? printed in usa typical application part number description comments lt1460 micropower series references 0.075% max, 10ppm/c max, 20ma output current lt1461 micropower series low dropout 0.04% max, 3ppm/c max, 50ma output current lt1790 micropower precision series references 0.05% max, 10ppm/c max, 60a supply, sot23 package lt6650 micropower reference with buffer ampli? er 0.5% max, 5.6a supply, sot23 package lt6660 tiny micropower series reference 0.2% max, 20ppm/c max, 20ma output current, 2mm 2mm dfn improved reference supply rejection in a data converter application related parts v out c out 1f c1 0.1f c2 10f r1 50k 6652 ta05 ltc6652 data 16 d out shdn v1 v2 v3 v4 v in v cc ref gnd gnd ref gnd d/a vdac a/d 16 ltc1657 ltc1605

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