www.fairchildsemi.com rev. 1.0.5 1/8/01 features ? low voltage operation to 1.24v ? 1% reference voltage tolerance ? output voltage adjustable from v ref to 12v ? low 80a operational cathode current ? 0.25 ? typical output impedance ? to-92 and sot23-5 packages applications ? voltage reference for discrete power circuits description the rc0431a is a low-voltage 3-terminal adjustable precision voltage reference regulator. it has an excellent thermal stability over the standard commercial temperature range. the output voltage can be set to any value between vref (1.24v) and 12v using two external resistors. the rc0431a operates from a lower voltage (1.24v) than the traditional shunt regulator references which operate from 2.5v. when used with an optocoupler, the rc0431a will be an ideal voltage reference in an isolated feedback circuit for use in switched-mode power supplies and modular dc-dc converters. the rc0431a has a low output impedance of active output circuitry offering a very sharp turn-on characteristic. the rc0431a will be an excellent replacement for low-voltage zener diodes in many applications such as on-board regulation and adjustable power supplies. symbol block diagram rc0431a (rc431a) low-voltage adjustable precision shunt regulator ref 65-431a-01 anode cathode v ref = 1.24v ref + _ cathode anode 65-431a-02
rc0431a (rc431a) product specification 2 rev. 1.0.5 1/8/01 pin assignments equivalent schematic absolute maximum ratings ratings are over full operating free-air temperature range unless otherwise noted. notes: 1. functional operation under these conditions is not implied. permanent damage may occur if the device is subjected to conditions outside these ratings. recommended operating conditions cathode voltage, v ka 13.2v continuous cathode current i k ?0ma to 20ma reference current, i ref ?.05ma to 3ma power dissipation see dissipation rating table storage temperature range -65 to 150 c parameter min. max. units cathode voltage, v ka v ref 12 v cathode current, i k 0.1 15 ma operating temperature range in free-air, t a 070 c 1 2 34 5 nc cathode anode ref nc nc = no internal connection 65-431a-03 sot-23 package (top view) to-92 package (top view) anode cathode ref a ref cathode 65-431a-04 anode
product specification rc0431a (rc431a) rev. 1.0.5 1/8/01 3 dissipation rating table electrical speci?ations t a = 25 c (unless otherwise noted) , at free-air notes: 1. functional operation under these conditions is not implied. permanent damage may occur if the device is subjected to conditions outside these ratings. 2. full temperature range is 0 c to 70 c. 3. the deviation parameters v ref(dev) and i ref(dev) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. the average full-range temperature coefficient of the reference input voltage, v ref , is defined as: where ? t a is the rated operating free-air temperature range of the device. v ref can be positive or negative depending on whether minimum v ref or maximum v ref , respectively, occurs at the lower temperature. 4. the dynamic impedance is defined as: ? z ka ? = ? v ka / ? i k when the device is operating with two external resistors (see figure 2), the total dynamic impedance of the circuit is given by: package power rating t a 25 c derating factor t a 25 c power rating t a = 70 c to-92 775mw 6.2mw/ o c 496mw sot23-5 150mw 1.2mw/ o c 96mw symbol parameters conditions min. typ. max. units v ref reference voltage v ka = v ref , t a = 25 c 1.228 1.24 1.252 v i k = 10ma, t a = 0 to 70 c 1.221 1.259 v ref (dev) v ref deviation over full temperature range (see note 2) v ka = v ref , i k = 10ma, see note 2 and figure 1. 412mv ? v ref ? v ka ratio of v ref change in cathode voltage change i k = 10ma, ? v ka = v ref to 6v. see figure 2. -1.5 -2.7 mv v i ref reference terminal current i k = 10ma, r1 = 10k ? , r2 = see figure 2. 0.15 0.5 a i ref(dev) i ref deviation over full temperature range (see note 2) i k = 10ma, r1 = 10k ? , r2 = see note 1 & figure 2. 0.05 0.3 a i k(min) minimum cathode current for regulation v ka = v ref see figure 1. 55 80 a i off off-state cathode current v ka = 6v, v ref = 0 see figure 3. 0.001 0.1 a |z ka | dynamic impedance (see note 3) v ka = v ref , f 1khz i k = 0.1ma to 15ma, see figure 1. 0.25 0.4 ? v ref ppm/ c ?? v ref dev () v ref t a 25 c = ?? ? {} 10 6 ? t a --------------------------------------------------------------------------------------------- - = z ka ? v ? i ------- - z ka 1 r 1 r 2 ------ - + ?? ?? =
rc0431a (rc431a) product specification 4 rev. 1.0.5 1/8/01 parameter measurement information figure 1. test circuit for figure 2. test circuit for v ka = v ref , v out = v ka = v ref v ka > v ref , v out = v ka = v ref x (1+r1/r2) + i ref x r1 figure 3. test circuit for i off figure 4. reference voltage vs. junction temp. figure 5. reference input current vs. junction temp. figure 6. cathode current vs. cathode voltage figure 7. cathode current vs. cathode voltage v out v 65-431a-05 in v ref i k v out v in v ref i k r1 r2 i ref 65-431a-06 v out v in i off 65-431a-07 1.250 1.246 1.242 1.238 1.230 20 40 20 0 40 60 80 100 tj junction temp. ( c) lk = 10 ma vref reference voltage (v) 250 200 150 100 50 40 20 0 20 40 60 80 100 tj junction temp. ( c) lk = 10 ma, r1 = 10 k ? , r2 = infinite iref reference input current (na) 15 10 5 0 5 10 15 0.5 -1 0 0.5 1 1.5 v ka cathode voltage (v) v ka = vref, t = 25 c lk cathode current (ma) 150 120 90 60 30 0 30 60 90 120 150 0.5 1 0 0.5 1 1.5 v ka cathode voltage (v) v ka = vref, t = 25 c lk cathode current ( a)
product specification rc0431a (rc431a) rev. 1.0.5 1/8/01 5 figure 8. off-state cathode current vs. figure 9. ratio of delta reference voltage junction temperature to delta cathode voltage vs. junction temperature figure 10. reference impedance vs. frequency figure 11. test circuit for reference impedance 40.0 30.0 20.0 10.0 0.0 40 0 20 20 40 60 80 100 tj junction temperature ( c) v ka = 6v, vref = 0v ioff off state cathode current (na) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 40 200 20406080100 tj junction temperature ( c) lk = 10 ma, del v ka = vref to 6v del vref / del vka (mv/v) 100 10 1 0.1 0.01 10000 100000 f frequency (hz) 1000000 10000000 1000 |zka| reference impedance ( ? ) 100 ? 100 ? i gnd output + k
rc0431a (rc431a) product specification 6 rev. 1.0.5 1/8/01 mechanical dimensions to-92 package a .170 .210 symbol inches min. max. min. max. millimeters notes b .015 .021 .020 c .014 d .175 .205 e1 .045 .055 l 4 6 .500 .080 .115 s e .125 .165 4.32 5.33 .38 .53 .51 .36 4.45 5.21 1.14 1.40 4 6 12.70 2.03 2.92 3.18 4.19 e .095 .105 2.41 2.67 notes: 1. 2. package outline exclusive of any mold flashes dimension. package outline exclusive of burr dimension. c s e d a e-pin c 1/16 l b e1 e
product specification rc0431a (rc431a) rev. 1.0.5 1/8/01 7 mechanical dimensions (continued) sot23-5 package e b e1 d a1 a l c e h a .170 .195 symbol inches min. max. min. max. millimeters notes a1 .014 .020 .020 b.008 c .003 .010 e .059 .071 e h .087 .126 .037 bsc .075 bsc 0 10 e1 l d .106 .122 .90 1.45 .00 .15 .50 .20 .08 .25 1.50 1.80 2.20 3.20 .004 .024 .10 .60 .95 bsc 1.90 bsc 0 10 2.70 3.10 notes: 1. 2. 3. package outline exclusive of mold flash & metal burr. package outline exclusive of solder plating. eiaj ref number sc-74a.
rc0431a (rc431a) product specification 1/8/01 0.0m 002 stock#ds3000431a ? 2001 fairchild semiconductor corporation life support policy fairchild s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com ordering information product number package rc0431am sot23-5 rc0431at to-92
product folder - fairchild p/n rc0431a - product information fairchild semiconductor space space space search | parametric | cross reference | inventory space product folders and datasheets application notes space space space find products home >> find products >> space space space space products groups space analog and mixed signal discrete interface logic microcontrollers non-volatile memory optoelectronics markets and applications new products product selection and parametric search cross-reference search technical information buy products technical support my fairchild company rc0431a product information related links request samples dotted line how to order products dotted line product change notices (pcns) dotted line support dotted line distributor and field sales representatives dotted line quality and reliability dotted line design tools contents general description | features | applications | product status/pricing/packaging general description the rc0431a is a low-voltage 3-terminal adjustable precision voltage reference regulator. it has an excellent thermal stability over the standard commercial temperature range. the output voltage can be set to any value between vref (1.24v) and 12v using two external resistors. the rc0431a operates from a lower voltage (1.24v) than the traditional shunt regulator references which operate from 2.5v. when used with an optocoupler, the rc0431a will be an ideal voltage reference in an isolated feedback circuit for use in switched- mode power supplies and modular dc-dc converters. the rc0431a has a low output impedance of active output circuitry offering a very sharp turn-on characteristic. the rc0431a will be an excellent replacement for low-voltage zener diodes in many applications such as on-board regulation and adjustable power supplies. back to top features l low voltage operation to 1.24v l 1% reference voltage tolerance l output voltage adjustable from vref to 12v l low 80a operational cathode current l 0.25 typical output impedance l to-92 and sot23-5 packages space datasheet download this datasheet pdf e-mail this datasheet [e- mail] this page print version file:///d|/fair/pdf/rc0431a.html (1 of 2) [10/7/02 11:11:52 am]
product folder - fairchild p/n rc0431a - product information back to top applications l voltage reference for discrete power circuits back to top product status/pricing/packaging product product status pricing* inventory check & ordering package marking packing method rc0431am full production $0.429 purchase &e&e&y &o431a&c &.&o&e&v tape reel rc0431at full production $0.386 purchase $y&z&t 431at c bulk RC0431AMC full production $0.429 purchase &e&e&y &o431a&c &.&o&e&v tape reel rc0431amt full production $0.429 purchase &e&e&y &o431a&c &.&o&e&v tape reel * fairchild 1,000 piece budgetary pricing back to top space space home | find products | technical information | buy products | support | company | contact us | site index | privacy policy ? copyright 2002 fairchild semiconductor space space file:///d|/fair/pdf/rc0431a.html (2 of 2) [10/7/02 11:11:52 am]
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