schematic diagram precision 2.5 volt micropower voltage reference issue 6 ? january 2003 device description the zr285 uses a bandgap circuit design to achieve a precision micropower voltage reference of 2.5 volts. the device is available in a small outline surface mount package, ideal for applications where space saving is important, as well as packages for through hole requirements. the zr285 design provides a stable voltage without an external capacitor and is stable with capacitive loads. the zr285 is recommended for operation between 20 a and 20ma and so is ideally suited to low power and battery powered applications. excellent performance is maintained to an absolute maximum of 30ma, however the rugged design and 20 volt processing allows the reference to withstand transient effects and currents up to 200ma. superior switching capability allows the device to reach stable operating conditions in only a few microseconds. features ? small outline sot23 package ? to92 style packages ? no stabilising capacitor required ? low knee current, 15 a typical ? typical t c 30ppm/c ? typical slope resistance 0.4 ? ? 3%, 2% and 1% tolerance ? industrial temperature range ? operating current 20 a to 20ma applications ? battery powered and portable equipment. ? metering and measurement systems. ? instrumentation. ? test equipment. ? data acquisition systems. ? precision power supplies. v r g nd zr285-2.5 4-165
absolute maximum rating reverse current 30ma forward current 25ma operating temperature -40 to 85 c storage temperature -55 to 125 c power dissipation (t amb =25 c) sot23 330mw e-line,2 pin(to92) 500mw e-line,3 pin(to92) 500mw electrical characteristics test conditions (unless otherwise stated) t amb =25 c symbol parameter conditions limits tol. % units min typ max v r reverse breakdown voltage i r =150 a 2.475 2.45 2.425 2.5 2.5 2.5 2.525 2.55 2.575 1 2 3 v i min minimum operating current 13 20 a i r recommended operating current 0.02 20 ma t c ? average reverse breakdown voltage temp. co. i r =1ma to 20ma 30 90 ppm/ c r s slope resistance 0.4 1 ? z r reverse dynamic impedance i r =1ma f = 100hz i ac = 0.1 i r 0.3 0.8 ? e n wideband noise voltage i r = 150 a f = 10hz to 10khz 60 v (rms) zr285-2.5 r e v e r s e c u r r e n t ( a ) reverse characteristics reverse voltage (v) 0 1.0 2.0 3.0 t a =25c 0 10 20 30 40 ? t c = ( v r ( max ) ? v r ( min ) ) x 1000000 v r x ( t ( max ) ? t ( min ) ) note: v r(max) - v r(min) is the maximum deviation in reference voltage measured over the full operating temperature range. r s = v r change ( i r ( min ) to i r ( max )) i r ( max ) ? i r ( min ) 4-166
-40 -20020 40 60 80 2.47 2.48 2.49 2.50 2.51 0.1 110100 0.2 0. 4 0.6 0.8 1.0 1.2 1.4 10 100 1k 10k 100k 1 10 100 1000 04 8 12 16 0 1 2 0 10 04 8 12 16 0 10 2 1 0 typical characteristics transient response - single pulse transient response - repetitive test temperature ( c) reference current (ma) temperature drift slope resistance v current r e f e r e n c e v o l t a g e ( v ) s l o p e r e s i s t a n c e ( ? ) time ( s) slope resistance v frequency 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0.001 0.01 0.1 1 10 100 f o r w a r d v o l t a g e ( v ) forward characteristics forward current (ma) ti me ( s) s l o p e r e s i s t a n c e ( ? ) v i n ( v ) v r ( v ) frequency (khz) v i n ( v ) v r ( v ) i r =150 a to 5ma i r =150 a i r =1ma i r =5ma i r =5ma i r =150 a i r =5ma i r =150 a 3 85 c 25 c -40 c zr285-2.5 4-167
zr285-2.5 sot23 package suffix ? f top view ? pin 1 floating or connected to pin 2 e-line, 3 pin,rev package suffix ? r bottom view ? pin 3 floating or connected to pin 1 e-line, 2 pin package suffix ? y bottom view connection diagrams part no tol% package partmark zr285f03 3 sot23 28a zr285f02 2 sot23 28b zr285f01 1 sot23 28c zr285r03 3 e-line * zr28503 zr285r02 2 e-line * zr28502 part no tol% package partmark zr285r01 1 e-line * zr28501 zr285y03 3 e-line ? zr28503 zr285y02 2 e-line ? zr28502 zr285y01 1 e-line ? zr28501 * e-line 3 pin reversed ? e-line 2 pin ordering information 4-168
europe zetex plc fields new road chadderton oldham, ol9 8np united kingdom telephone (44) 161 622 4422 fax: (44) 161 622 4420 uk.sales@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, ny11788 usa telephone: (631) 360 2222 fax: (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 2002 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 purposes or form part of any order or contract or be regarded as 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. some changes to earlier published data may have been made, data presented in this hand book supersedes all previous specifications. the information contained in this publication has been carefully checked and is considered to be accurate, but no responsibility is assumed for any inaccuracies. zetex makes no warranty, representation or guarantee regarding the suitability of the products and circuits in this publication for any given purpose; nor does zetex assume any liability arising from the use or application of any of these products or circuits and specifically disclaims any and all consequential and incidental damages. zetex products are specifically not authorised for use as critical components in life support devices or systems without the express written approval of the managing director of zetex plc. as used herein - a. life support devices or systems are devices or systems which (1) are intended to implant into the body, or (2) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labelling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. e. & o. e. ?all rights reserved? product and information disclaimer
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