schematic diagram precision 2.5 volt micropower voltage reference issue 5 C february 1998 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 small outline surface mount packages, 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 m 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 and so8 packages to92 style packages no stabilising capacitor required low knee current, 15 m a typical typical t c 30ppm/c typical slope resistance 0.4 w 3%, 2% and 1% tolerance industrial temperature range operating current 20 m 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 85c storage temperature -55 to 125c power dissipation (t amb =25c) so8 625mw sot23 330mw e-line,2 pin(to92) 500mw e-line,3 pin(to92) 500mw electrical characteristics test conditions (unless otherwise stated) t amb =25c symbol parameter conditions limits tol. % units min typ max v r reverse breakdown voltage i r =150 m 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 m 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 w z r reverse dynamic impedance i r =1ma f = 100hz i ac =0.1 i r 0.3 0.8 w e n wideband noise voltage i r =150 m a f = 10hz to 10khz 60 m v (rms) zr285-2.5 r ev ers e c ur r e nt ( m 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 -20 0 20 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 ef erence v ol tage (v) s l ope resi s t a nce ( w ) time ( m 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 orw ard v ol t a ge (v) forward characteristics forward current (ma) time ( m s) s l ope resi s t a nce ( w ) v i n ( v) v r ( v) frequency (khz) v i n ( v) v r (v) i r =150 m a to 5ma i r =150 m a i r =1ma i r =5ma i r =5ma i r =150 m a i r =5ma i r =150 m a 3 85c 25c -40c ? ? zr285-2.5 4-167
zr285-2.5 so8 package suffix C n8 top view sot23 package suffix C f top view C pin 1 floating or connected to pin 2 e-line, 3 pin,rev package suffix C r bottom view C pin 3 floating or connected to pin 1 e-line, 2 pin package suffix C y bottom view connection diagrams part no tol% package partmark zr285f03 3 sot23 28a zr285f02 2 sot23 28b zr285f01 1 sot23 28c zr285n803 3 so8 zr285803 zr285n802 2 so8 zr285802 zr285n801 1 so8 zr285801 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
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