semiconductor technical data micropower voltage reference diodes ordering information order this document by lm285/d z suffix plastic package case 29 d suffix plastic package case 751 (so8) (bottom view) 1 32 8 6 5 cathode n.c. n.c. n.c. 4 3 2 anode n.c. n.c. 1 n.c. n.c. cathode anode + lm3851.2 1.235 v 3.3 k 1.5 v battery standard application device operating temperature range tolerance lm285d1.2 lm285z1.2 t a = 40 to +85 c 1.0% lm285d2.5 lm285z2.5 LM385Bd1.2 LM385Bz1.2 lm385d1.2 lm385z1.2 LM385Bd2.5 LM385Bz2.5 lm385d2.5 lm385z2.5 reverse break down voltage 1.235 v 1.5% 2.500 v t a = 0 to +70 c 1.0% 1.235 v 2.0% 1.235 v 1.5% 2.500 v 3.0% 2.500 v 1 motorola analog ic device data
the lm285/lm385 series are micropower twoterminal bandgap voltage regulator diodes. designed to operate over a wide current range of 10 m a to 20 ma, these devices feature exceptionally low dynamic impedance, low noise and stable operation over time and temperature. tight voltage tolerances are achieved by onchip trimming. the large dynamic operating range enables these devices to be used in applications with widely varying supplies with excellent regulation. extremely low operating current make these devices ideal for micropower circuitry like portable instrumentation, regulators and other analog circuitry where extended battery life is required. the lm285/lm385 series are packaged in a low cost to226aa plastic case and are available in two voltage versions of 1.235 and 2.500 v as denoted by the device suffix (see ordering information table). the lm285 is specified over a 40 c to +85 c temperature range while the lm385 is rated from 0 c to +70 c. the lm385 is also available in a surface mount plastic package in voltages of 1.235 and 2.500 v. ? operating current from 10 m a to 20 ma ? 1.0%, 1.5%, 2.0% and 3.0% initial tolerance grades ? low temperature coefficient ? 1.0 w dynamic impedance ? surface mount package available representative schematic diagram open for 1.235 v 10 k cathode anode 100 k 500 w 600 k 600 k 425 k 74.3 k 8.45 k 600 k 360 k open for 2.5 v ? motorola, inc. 1996 rev 2
lm285 lm385, b 2 motorola analog ic device data maximum ratings (t a = 25 c, unless otherwise noted) rating symbol value unit reverse current i r 30 ma forward current i f 10 ma operating ambient temperature range t a c lm285 lm385 40 to + 85 0 to +70 operating junction temperature t j + 150 c storage temperature range t stg 65 to + 150 c electrical characteristics (t a = 25 c, unless otherwise noted) lm2851.2 lm3851.2 / LM385B1.2 characteristic symbol min typ max min typ max unit reverse breakdown voltage (i rmin i r 20 ma) v (br)r v lm2851.2/LM385B1.2 1.223 1.235 1.247 1.223 1.235 1.247 t a = t low to t high (note 1) 1.200 1.270 1.210 1.260 lm3851.2 1.205 1.235 1.260 t a = t low to t high (note 1) 1.192 1.273 minimum operating current i rmin m a t a = 25 c 8.0 10 8.0 15 t a = t low to t high (note 1) 20 20 reverse breakdown voltage change with current d v (br)r mv i rmin i r 1.0 ma, t a = +25 c 1.0 1.0 t a = t low to t high (note 1) 1.5 1.5 1.0 ma i r 20 ma, t a = +25 c 10 20 t a = t low to t high (note 1) 20 25 reverse dynamic impedance z 0.6 0.6 w i r = 100 m a, t a = +25 c average temperature coefficient d v (br) / d t 80 80 ppm/ c 10 m a i r 20 ma, t a = t low to t high (note 1) wideband noise (rms) n 60 60 m v i r = 100 m a, 10 hz f 10 khz long term stability s 20 20 ppm/ i r = 100 m a, t a = +25 c 0.1 c khr
lm285 lm385, b 3 motorola analog ic device data electrical characteristics (t a = 25 c, unless otherwise noted) lm2852.5 lm3852.5 / LM385B2.5 characteristic symbol min typ max min typ max unit reverse breakdown voltage (i rmin i r 20 ma) v (br)r v lm2852.5/LM385B2.5 2.462 2.5 2.538 2.462 2.5 2.538 t a = t low to t high (note 1) 2.415 2.585 2.436 2.564 lm3852.5 2.425 2.5 2.575 t a = t low to t high (note 1) 2.400 2.600 minimum operating current i rmin m a t a = 25 c 13 20 13 20 t a = t low to t high (note 1) 30 30 reverse breakdown voltage change with current d v (br)r mv i rmin i r 1.0 ma, t a = +25 c 1.0 2.0 t a = t low to t high (note 1) 1.5 2.5 1.0 ma i r 20 ma, t a = +25 c 10 20 t a = t low to t high (note 1) 20 25 reverse dynamic impedance z 0.6 0.6 w i r = 100 m a, t a = +25 c average temperature coefficient d v (br) / d t 80 80 ppm/ c 20 m a i r 20 ma, t a = t low to t high (note 1) wideband noise (rms) n 120 120 m v i r = 100 m a, 10 hz f 10 khz long term stability s 20 20 ppm/ i r = 100 m a, t a = +25 c 0.1 c khr notes: 1. t low = 40 c for lm2851.2, lm2852.5 t high = +85 c for lm2851.2, lm2852.5 = 0 c for lm3851.2, LM385B1.2, lm3852.5, LM385B2.5 t high =+70 c for lm3851.2, LM385B1.2, lm3852.5, LM385B2.5
lm285 lm385, b 4 motorola analog ic device data 1.1 t, time (ms) 0 1.0 0.9 0.8 0.7 0.6 0.3 0.2 0.1 1.25 1.50 0.75 0.50 0 5.0 0.25 10 0 1.00 output (v) input (v) input dut output 100 k 100 875 1.0 k 100 k 10 k 10 0 125 250 375 750 625 500 f, frequency (hz) e n , noise (nv/ hz) 125 t a , ambient temperature ( c) 1.210 1.220 1.230 1.240 1.250 100 75 50 025 25 50 v (br)r , reverse voltage (v) 10 0.01 100 1.0 0.1 1.2 1.0 0.8 0.6 0.4 0.2 0 i f , forward current (ma) v f , forward voltage (v) typical performance curves for lm2851.2 / 3851.2 / 385b1.2 0.2 0.4 0.6 0.8 1.0 1.2 10 1.4 100 1.0 0.1 0 v( br) , reverse voltage (v) figure 1. reverse characteristics , reverse current ( a) m i r figure 2. reverse characteristics 0.1 1.0 10 100 0.01 8.0 6.0 4.0 2.0 0 2.0 10 i r , reverse current (ma) v (br)r , reverse voltage change (mv) d t a = + 85 c +25 c 40 c t a = + 85 c +25 c 40 c figure 3. forward characteristics t a = 40 c +25 c +85 c figure 4. temperature drift i r = 100 m a figure 5. noise voltage figure 6. response time
lm285 lm385, b 5 motorola analog ic device data v( br) , reverse voltage (v) 1.1 t, time (ms) 0 1.0 0.9 0.8 0.7 0.6 0.3 0.2 0.1 2.50 3.00 1.50 1.00 0 5.0 0.50 10 0 2.00 output (v) input (v) input dut output 100 k 100 1.0 k 100 k 10 k 10 0 250 500 750 1500 1250 1000 f, frequency (hz) e n , noise (nv/ hz) 125 t a , ambient temperature ( c) 2.450 2.470 2.490 2.510 2.520 100 75 50 025 25 50 v (br)r , reverse voltage (v) 10 0.01 100 1.0 0.1 1.2 1.0 0.8 0.6 0.4 0.2 0 i f , forward current (ma) v f , forward voltage (v) typical performance curves for lm2852.5 / 3852.5 / 385b2.5 0.5 1.0 1.5 2.0 2.5 3.0 10 3.5 100 1.0 0.1 0 figure 7. reverse characteristics , reverse current ( a) m i r figure 8. reverse characteristics 0.1 1.0 10 100 0.01 8.0 6.0 4.0 2.0 0 2.0 10 i r , reverse current (ma) v (br)r , reverse voltage change (mv) d t a = + 85 c +25 c 40 c t a = + 85 c +25 c 40 c figure 9. forward characteristics t a = 40 c +25 c +85 c figure 10. temperature drift i r = 100 m a figure 11. noise voltage figure 12. response time 2.460 2.480 2.500
lm285 lm385, b 6 motorola analog ic device data z suffix plastic package case 2904 issue ad outline dimensions d suffix plastic package case 75105 (so8) issue n notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 3. contour of package beyond dimension r is uncontrolled. 4. dimension f applies between p and l. dimension d and j apply between l and k minimum. lead dimension is uncontrolled in p and beyond dimension k minimum. r a p j l f b k g h section xx c v d n n xx seating plane dim min max min max millimeters inches a 0.175 0.205 4.45 5.20 b 0.170 0.210 4.32 5.33 c 0.125 0.165 3.18 4.19 d 0.016 0.022 0.41 0.55 f 0.016 0.019 0.41 0.48 g 0.045 0.055 1.15 1.39 h 0.095 0.105 2.42 2.66 j 0.015 0.020 0.39 0.50 k 0.500 12.70 l 0.250 6.35 n 0.080 0.105 2.04 2.66 p 0.100 2.54 r 0.115 2.93 v 0.135 3.43 1 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimensions a and b do not include mold protrusion. 4. maximum mold protrusion 0.15 (0.006) per side. 5. dimension d does not include dambar protrusion. allowable dambar protrusion shall be 0.127 (0.005) total in excess of the d dimension at maximum material condition. seating plane 14 5 8 c k 4x p a 0.25 (0.010) m tb ss 0.25 (0.010) m b m 8x d r m j x 45 f a b t dim min max min max inches millimeters a 4.80 5.00 0.189 0.196 b 3.80 4.00 0.150 0.157 c 1.35 1.75 0.054 0.068 d 0.35 0.49 0.014 0.019 f 0.40 1.25 0.016 0.049 g 1.27 bsc 0.050 bsc j 0.18 0.25 0.007 0.009 k 0.10 0.25 0.004 0.009 m 0 7 0 7 p 5.80 6.20 0.229 0.244 r 0.25 0.50 0.010 0.019 g
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