rev. c date:3/12/04 spx385-5.0 micropower voltage reference ? copyright 2004 sipex corporation 1 features trimmed bandgap .......................................... 1% wide operating current ............... 50 a to 20ma extended temperature range ... -40 c to +85 c dynamic impedance .............................. 1 ? max offered in small sot-23 low cost solution 5v micropower voltage reference spx385-5.0 the spx385-5.0 is a micropower 2-terminal band-gap voltage reference with a very wide operating current range from 50 a to 20ma that provides a stable voltage. the spx385-5.0 is available in a sot-23 package with an operating temperature range of -40 c to 85 c. a 1.2 and 2.5 volt device are also available - spx385-1.2, spx385-2.5. figure 1: block diagram applications battery operating equipment adjustable supplies switching power supplies error amplifiers anode (a) cathode (k) 1.25v + - 1.5m 500k description preliminary block diagram single supply amplifier monitors / vcr / tv personal computers power use meter spx385 3 pin sot-23 cathode n/c anode
rev. c date:3/12/04 spx385-5.0 micropower voltage reference ? copyright 2004 sipex corporation 2 parameter min. typ. max unit conditions reference voltage 4.90 5.00 5.10 ? v 2% 4.95 5.00 5.05 1% dynamic output 0.6 1.0 ? ? f = 20hz impedance ? i r = 100 a reference voltage 10 20 ? mv 20 a i r 20ma change with i r . temperature coefficient 30 50 ? ppm/ c note 1 minimum operating current 30 50 ? a output wideband noise 120 ? vrms 10hz f 10khz long term stability 60 ? ppm t=1000hr; t a = 25 c 0.1 c operating temperature -40 +85 c stresses greater than those listed under absolute maximum rat- ings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. reverse current (i ka ) ............................................................. 30ma forward current (i ak ) ............................................................. 10ma operating temperature range (t a ) ............................ -40 to +85 c junction temperature (t j ) ..................................................... 150 c storage temperature (t stg ) ....................................... - 65 to 150 c lead temperature (soldering 10 sec.), t l ............................. 300 c i in = 100 a, t a = 25 c, unless otherwise specified. the ? denotes the specifications which apply over the full operating temperature range, unless otherwise specified. *calculating average temperature coefficient (tc) ? t ? v ka 015304 5607590105 -10 0.5 5000 0 00 0.07 mv/ c 0.003 %/ c 27 ppm/ c tc in mv/ c= tc in % / c= ? v ka (mv) ? t a ? t a ? v ka at 25 c ? v ka x 100 () tc in ppm/ c= ? t a ? v ka at 25 c ? v ka x10 6 () ppm % mv junction temperature ( c) figure 2. v ka vs. temperature note 1. three-point measurement guarantees the error band over the specified temperature range. electrical characteristics absolute maximum ratings
rev. c date:3/12/04 spx385-5.0 micropower voltage reference ? copyright 2004 sipex corporation 3 typical performance characteristics figure 1. improving regulation of adjustable regula- tors figure 2. micropower reference from 9v battery figure 4: precision micropower 10v reference 200k 9v spx385-5.0 5.0v spx385-5.0 500k + - v in = 15v lm4250c 3 7 2 4 8 22m 500k 500k 150pf 6 10v i q ? 30 a standby current i q v in v ka i k lm312 r1 68k ? + r2 c1 150pf 7 6 4 3 2 spx385-5.0 i out * 1.5v to 27v 30v * i out = 2.5v r2 figure 3. precision 1 a to 1ma current source
rev. c date:3/12/04 spx385-5.0 micropower voltage reference ? copyright 2004 sipex corporation 4 package: 3 pin sot-23 a a2 a1 side view a a seating plane c c with plating base metal b e e1 e e1 d b 1 2 3 l1 l l2 gauge plane view c see view c b b 0.89 - 1.12 0.01 - 0.10 dimensions in (mm) 3 pin sot-23 jedec to-236 (ab) variation 0.88 .95 1.02 0.30 - 0.50 0.08 - 0.20 0.30 0.45 0.60 0.54 ref 0? - 8 a a1 a2 b c d e e1 l l1 min nom max 2.80 2.90 3.04 2.10 - 2.64 1.20 1.30 1.40 e e1 0.95 bsc 1.90 bsc 3 pin sot-23
rev. c date:3/12/04 spx385-5.0 micropower voltage reference ? copyright 2004 sipex corporation 5 part number accuracy output voltage package type spx385am-5.0 1.0% 5.0v 3-pin sot-23 spx385bm-5.0 2.0% 5.0v 3-pin sot-23 analog excellence sipex corporation headquarters and sales office: 233 hillview dr milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 sales office: 22 linnell circle billerica, ma 01821 tel: (978) 667-8700 fax: (978) 670-9001 sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others. ordering information
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