date: 11/05/04 spx385-2.5 micropower voltage reference ? copyright 2004 sipex corporation 1 features trimmed bandgap ............................ 1% and 2% wide operating current ............... 20 a to 20ma extended temperature range ... -40 c to +85 c dynamic impedance .............................. 1 ? max offered in sot-23, to-92, soic, and sot-89 improved replacement for lm185/285/385-2.5v, as385-2.5 low cost solution micropower voltage reference spx385-2.5 the spx385-2.5 is a micropower 2-terminal band-gap voltage reference with a very wide operating current range from 20 a to 20ma that provides a stable voltage. the high stability of this device is primarily the result of the low temperature coefficient thin film resistor process and laser trimming of the output voltage at the wafer level. the spx385-2.5 is available in a sot-23, to-92, soic-8 and sot-89 package with an operating temperature range of -40 c to 85 c. a 1.2 and 5 volt device is also available - spx385-1.2 and spx385-5. figure 1: block diagram applications battery operating equipment adjustable supplies switching power supplies anode (a) cathode (k) 1.25v + - 500k 500k description block diagram spx385 3 pin sot-23 cathode n/c anode refer to page 4 for pinouts. now available in lead free packaging error amplifiers single supply amplifier monitors / vcr / tv personal computers
date: 11/05/04 spx385-2.5 micropower voltage reference ? copyright 2004 sipex corporation 2 spx385a-2.5 spx385-2.5 parameter conditions min. typ. max min. typ. max. unit reference voltage 2.475 2.500 2.525 2.450 2.500 2.550 v dynamic output f = 20hz 0.6 1.0 0.6 1.0 ? impedance i r = 100 a reference voltage 20 a i r 20ma 10 20 10 20 mv change with i r . temperature coefficient note 1 60 100 60 100 ppm/ c minimum operating current 15 20 15 20 a output wideband noise 10hz f 10khz 120 120 vrms long term stability t=1000hr; 60 60 ppm t a = 25 c 0.1 c operating temperature -40 +85 -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. *calculating average temperature coefficient (tc) d dv ka 0153 045607590105 -10 0.5 5000 0 00 0.07 mv / c 0.003 %/ c 27 ppm/ c tc i n mv/ c= tc i n % / c= dv ka (mv) dt a dt a dv ka at 25 c dv ka x 100 () tc i n ppm/ c= dt a dv ka at 25 c dv 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. absolute maximum ratings typical thermal resistances package 0 ja 0 jc typical derating to-92 160 c/w 80 c/w 6.3 mw/ c sot-23 575 c/w 150 c/w 1.7 mw/ c soic-8 175 c/w 45 c/w 5.7 mw/ c sot-89 110 c/w 8 c/w 9.1 mw/ c typical deratings of the thermal resistances are given for ambient temperature >25 . electrical characteristics
date: 11/05/04 spx385-2.5 micropower voltage reference ? copyright 2004 sipex corporation 3 figure 3. test circuit figure 4. high current operating characteristics figure 5. reference voltage vs. ambient temperature figure 6. low current operating characteristics v in v ka i k -2 -1 0123 -20 i k - cathode current (ma) v ka - cathode voltage (v) v ka t emperature range: 0 c to 85 c -15 -10 -5 0 5 10 15 20 25 30 v ka - voltage (v) t a - ambient temperature (c) 90 120 -60 -30 0 30 60 2.53 i k = 10ma 2.52 2.51 2.50 2.49 2.48 2.47 2.46 2.45 v ref = 2.500v at 25 c 45 85c v ka - cathode voltage (v) i k - cathode current (a) 30 15 0 -1.0 0 1.0 2.0 3.0 25c -0c figure 7a. precision 1 a to 1ma current sink figure 7b. precision 1 a to 1ma current source lm312 r1 68k ? + r2 c1 150pf 7 6 4 3 2 spx385-2.5 i out * -1.5v to -27v -30v * i out = 2.5v r2 lm312 r1 68k ? + r2 c1 150pf 7 6 4 3 2 spx385-2.5 i out * 1.5v to 27v 30v * i out = 2.5v r2 typical performance characteristics
date: 11/05/04 spx385-2.5 micropower voltage reference ? copyright 2004 sipex corporation 4 typical performance characteristics figure 8. improving regulation of adjustable regula- tors figure 9. micropower reference from 9v battery figure 10. wide input range reference figure 11: precision micropower 10v reference 375 v in spx385-2.5 5v lm338 120 200k 9v spx385-2.5 2.5v 3.3k v in = 3.7v to 30v spx385-2.5 out 2.5v lm334 spx385-2.5 500k + - v in = 15v lm4250c 3 7 2 4 8 22m 1.5m 500k 150pf 6 10v i q ? 30 a standby current i q bottom view t o-92 (n) 13 2 n/c cathode anode t op view 2 1 3 4 8 7 6 5 8-pin nsoic n/c n/c n/c sot-23-3 (m) 3 2 t op view t op view sot-89 (m1) 1 2 3 anode cathode anode cathode n/c 1 cathode anode n/c n/c n/c n/c package pinouts
date: 11/05/04 spx385-2.5 micropower voltage reference ? copyright 2004 sipex corporation 5 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 gauge plane view c see view c b b section b-b view a-a seating plane symbol min nom max a0.89- 1.12 a1 0.01 - 0.1 a2 0.88 0.95 1.02 b0.3 -0.5 c0.08- 0.2 d2.82. 93.0 4 e e1 e0.95- 2.64 e1 1.2 1.3 1.4 l0.40. 50.6 l1 ?0o-8o note: dimensions in (mm) 3 pin sot-23 jedec to-236 (ab) variation 0.95 bsc 1.90 bsc 0.54 ref
date: 11/05/04 spx385-2.5 micropower voltage reference ? copyright 2004 sipex corporation 6 package: 3 pin sot-89 h e e e1 d d1 1 2 3 1.0 c 5o(2x) bb1 b ro.15 8o(2x) l symbol min nom max b 0.36 0.42 0.48 l 0.8 - 1.2 b1 0.41 0.47 0.53 c 0.38 0.4 0.43 d 4.4 4.5 4.6 d1 1.4 1.6 1.75 h 3.94 - 4.25 e 2.4 2.5 2.6 e 1.45 1.5 1.55 e1 2.9 3 3.1 note: dimensions in (mm) 3 pin sot-89
date: 11/05/04 spx385-2.5 micropower voltage reference ? copyright 2004 sipex corporation 7 package: 8 pin nsoic a a1 a2 side view seating plane section b-b with plating symbol min nom max a 1.35 - 1.75 a1 0.1 - 0.25 a2 1.25 - 1.65 b 0.31 - 0.51 c 0.17 - 0.24 d e e1 e l 0.4 - 1.27 l1 l2 ?0o-8o ?1 5o - 15o note: dimensions in (mm) 8 pin nsoic jedec mo-012 (aa) variation 4.90 bsc 6.00 bsc 3.90 bsc 1.27 bsc 1.04 ref 0.25 bsc gauge plane l1 l ? 1 ? seating plane l2 view c to p view b see view c b b e e/2 e1 index area (d/2 x e1/2) e1/2 d 1 e c base metal b
date: 11/05/04 spx385-2.5 micropower voltage reference ? copyright 2004 sipex corporation 8 package: 3 pin to-92 d w l e1 e b a s1 a (2x) e r symbol min nom max a 0.17 - 0.195 b 0.014 - 0.02 e 0.13 - 0.155 e 0.95 - 0.105 e1 0.045 - 0.055 l 0.5 - 0.61 r 0.085 - 0.095 s1 0.045 - 0.06 w 0.016 - 0.022 d 0.175 - 0.195 a4o-6o note: dimensions in (inches) 3 pin to-92
date: 11/05/04 spx385-2.5 micropower voltage reference ? copyright 2004 sipex corporation 9 part number accuracy output voltage package type spx385am-2.5 1.0% 2.5v 3-pin sot-23 spx385am-2.5/tr 1.0% 2.5v 3-pin sot-23 spx385am1-2.5 1.0% 2.5v 3-pin sot-89 spx385am1-2.5/tr 1.0% 2.5v 3-pin sot-89 spx385as-2.5 1.0% 2.5v 8-pin nsoic spx385as-2.5/tr 1.0% 2.5v 8-pin nsoic spx385an-2.5 1.0% 2.5v 3-pin to-92 spx385an-2.5/tr 1.0% 2.5v 3-pin to-92 spx385m-2.5 2.0% 2.5v 3-pin sot-23 spx385m-2.5/tr 2.0% 2.5v 3-pin sot-23 spx385m1-2.5 2.0% 2.5v 3-pin sot-89 spx385m1-2.5/tr 2.0% 2.5v 3-pin sot-89 spx385s-2.5 2.0% 2.5v 8-pin nsoic spx385s-2.5/tr 2.0% 2.5v 8-pin nsoic spx385n-2.5 2.0% 2.5v 3-pin to-92 spx385n-2.5/tr 2.0% 2.5v 3-pin to-92 analog excellence sipex corporation headquarters and sales office: 233 hillview dr milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 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 available in lead free packaging. to order add ?-l? suffix to part number. example: spx385s-2.5/tr = standard; spx385s-l-2.5/tr = lead free /tr = tape and reel pack quantity is 2000 for to-92 and 2500 for sot-23, sot-89 and nsoic.
|
