1 semiconductors description the zrt025 is a monolithic integrated circuit providing a precise stable reference voltage of 2.5v at 500 a. the circuit features a knee current of 150 a and operation over a wide range of temperatures and currents. the zrt025 is available for surface mount applications. this product offers a trim facility whereby the output voltage can be adjusted as shown in fig.1. this facility is used when compensating for system errors or setting the reference output to a particular value. when the trim facility is not used, the pin should be left open circuit. features ? trimmable output ? excellent temperature stability ? low output noise figure ? available in two temperature ranges ? 1 and 2% initial voltage tolerance versions available ? no external stabilizing capacitor required in most cases ? low slope resistance ? no derating required at low temperatures ? sot223 package a grade -55 to 125c c grade -40 to 85c zrt025 issue 4 - december 2003 2.5v low powerprecision reference source device tol% operating temp c partmark reel size tape width quantity per reel zrt025gc2ta 2 -40 to 85 zrt025c2 7? 12mm 1,000 units ZRT025GC1TA 1 -40 to 85 zrt025c1 7? 12mm 1,000 units zrt025ga1ta 1 -55 to 125 zrt025a1 7? 12mm 1,000 units ordering information sot223 package suffix g top view (pin 4 floating or connected to pin 2) s o t 2 2 3
zrt025 semiconductors issue 4 - december 2003 2 symbol parameter initial voltage tolerance % grade a -55 to 125c grade c -40 to 85c unit ? v r output voltage change over relevant temperature range(see note (a)) 1 & 2 6.8 22.5 2.7 8.8 mv t c v r output voltage temperature coefficient (see note (b)) 1 & 2 15.0 50.0 15.0 50.0 ppm/c temperature dependent electrical characteristics parameter symbol limit unit reverse current (1) 75 ma operating temperature: a grade c grade t omp -55 to 125 -40 to 85 c c storage temperature t stg -55 to 150 c absolute maximum ratings (1) above 72c this figure should be linearly derated to 25ma at 125c package value unit sot223 2 w power dissipation (at t amb = 25c unless otherwise stated) symbol parameter conditions min. typ. max. unit v r output voltage 1% tolerance (a1,c1) 2% tolerance (c2) i r =500 a 2.475 2.450 2.500 2.500 2.525 2.550 v v v trim output voltage adjustment range r t =100k 5% t c v trim change in t c v r with output adjustment 2.5 ppm/c/% i r operating current range 0.15 75 ma t on t off turn-on timeturn-off time r l =1k 10 0.3 s e np-p output voltage noise (over the range 0.1 to 10hz) peak to peak measurement 50 v r s slope resistance i r = 0.5ma to 5ma (see note (c)) 0.85 2.0 electrical characteristics (at t amb = 25c unless otherwise stated)
notes: (a) output change with temperature the absolute maximum difference between the maximum output voltage and the minimum output voltage over the specified temperature range v r =v max -v min (b) output temperature coefficient (t c v r ) the ratio of the output change with temperature to the specified temperature range expressed in ppm/c tv vx vxt ppm c cr r r = ? ? 10 6 t= full temperature range (c) slope resistance (rs) the slope resistance is defined as : rs changeinv specificcurrentrange r = i=5-0.5=4.5ma (typically) (d) line regulation the ratio of change in output voltage to the change in input voltage producing it. rx vxr v s rsource 100 %/ zrt025 semiconductors issue 4 - december 2003 3 typical characteristics
figure 1: this circuit will allow the reference to be trimmed over a wide range. the device is specified over a 5% trim range. zrt025 semiconductors issue 4 - december 2003 4 schematic diagram
zrt025 semiconductors issue 4 - december 2003 5 europe zetex plc fields new road chadderton oldham, ol9 8np united kingdom telephone (44) 161 622 4444 fax: (44) 161 622 4446 hq@zetex.com zetex gmbh streitfeldstra?e 19 d-81673 mnchen germany telefon: (49) 89 45 49 49 0 fax: (49) 89 45 49 49 49 europe.sales@zetex.com americas zetex inc 700 veterans memorial hwy hauppauge, ny 11788 usa telephone: (1) 631 360 2222 fax: (1) 631 360 8222 usa.sales@zetex.com asia pacific zetex (asia) ltd 3701-04 metroplaza tower 1 hing fong road kwai fong hong kong telephone: (852) 26100 611 fax: (852) 24250 494 asia.sales@zetex.com these offices are supported by agents and distributors in major countries world-wide. this publication is issued to provide outline information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. the company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. for the latest product information, log on to www.zetex.com ? zetex plc 2003 dim millimeters inches dim millimeters inches min max min max min max min max a ? 1.80 ? 0.071 e 2.30 bsc 0.0905 bsc a1 0.02 0.10 0.0008 0.004 e1 4.60 bsc 0.181 bsc b 0.66 0.84 0.026 0.033 e 6.70 7.30 0.264 0.287 b2 2.90 3.10 0.114 0.122 e1 3.30 3.70 0.130 0.146 c 0.23 0.33 0.009 0.013 l 0.90 ? 0.0355 ? d 6.30 6.70 0.248 0.264 ???? package dimensions controlling dimensions are in millimeters. approximate conversions are given in inches package outline
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