www.fairchildsemi.com rev. 1.0.5 3/25/04 features adjustable shunt reference ? olerances to ?.5% (25 c) ? ow output noise ? ow temperature coef?ient to 100 ppm/? max small packages extended operating current range applications portable equipment disk drives instrumentation audio equipment data acquisition systems description the fan4041 adjustable precision shunt references are ideal for space- and cost-sensitive applications. they are available with output voltage tolerances of 0.5% and 1%. they also have excellent temperature coef?ients, to 100ppm/ c for the tighter tolerance grades. the fan4041 series has an e xtended operating current range, sinking as much as 25ma. the fan4041 series is available in sot-23 and to-92 packages. connection diagrams 1 2 fb + 3 sot-23 top view to-92 bottom view + fb 1 2 3 f an4041 precision micropower shunt voltage reference
fan4041 product specification 2 rev. 1.0.5 3/25/04 absolute maximum ratings 1 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 dissipation rating table equivalent schematic p arameter min. max. unit continuous cathode current, i k -30 30 ma power dissipation see dissipation rating table maximum output voltage 12 v storage temperature range -65 150 ? lead temperature (soldering, 10 sec.) 300 ? p arameter min. max. unit continuous cathode current, i k 0.07 25 ma operating temperature range in free air, t a -40 85 ? output voltage range 1.24 10 v package po wer rating t a 25 c derating factor t a 25 c po wer rating t a = 70 c to-92 550mw 5.5mw/? 302mw sot23 306mw 3.0mw/? 168mw + _ + _ * * fb * external adjust components. v ref
product specification fan4041 rev. 1.0.5 3/25/04 3 guaranteed electrical characteristics, fan4041 (t a = 25? unless otherwise speci?d, in free air) the ? denotes speci?ations which apply over the full operating temperature range. *typical. symbol parameter conditions limits units cd v ref reference voltage i k = 100?, v out = 5v 1.220 1.220 v* tcv ref reference voltage tolerance i k = 100?, v out = 5v ? ?.2 ?4 ?2 ?4 mv mv i rmin mimimum operating current ? 65 70 ? ? v ref / ? t reference voltage temperature coefficient i k = 1ma ? ?00 ?50 ppm/ c ? v ref / ? i k reference voltage change with operating current i rmin i k 1ma 1ma i k 12ma 1ma i k 25ma ? ? 2.0 8 12 2.5 10 15 mv mv mv* ? v ref / ? v o reference voltage change with output voltage i k = 1ma ? -2.5 -3.0 mv/v i fb feedback current ? 120 200 na z ka reverse dynamic impedance i k =1ma, f=120hz, i ac =0.1i k v out = v ref v out = 10v 0.3 2 0.3 2 ? * ? * e n wideband noise i k =100?, v out = v ref 10hz f 10khz 20 20 v rms * ? v ref reference voltage long-term stability t=1000hrs, t=25?, i k =100? 120 120 ppm*
fan4041 product specification 4 rev. 1.0.5 3/25/04 applications information the fan4041 is a precision micro-power curvature- corrected bandgap shunt voltage reference. for space critical applications, the fan4041 is available in the sub-miniature sot-23 package. the fan4041 has been designed for stable operation without the need of an external capacitor connected between the ?? pin and the ? pin. if, however, a bypass capacitor is used, the fan4041 remains stable. the minimum operating current is 65 a for the fan4041. in a conventional shunt regulator application (figure 1), an external series resistor (r s ) is connected between the supply voltage and the fan4041. r s determines the current that ?ws through the load (i l ) and the fan4041 (i q ). since load current and supply voltage may vary, r s should be small enough to supply at least the minimum acceptable i q to the fan4041 even when the supply voltage is at its minimum and the load current is at its maximum value. when the supply voltage is at its maximum and i l is at its minimum, r s should be large enough so that the current ?wing through the fan4041 is less than 25 ma. r s should be selected based on the supply voltage, (v s ), the desired load and operating current, (i l and i q ), and the f an4041 s reverse breakdown voltage, v r . the fan4041 output voltage can be adjusted to any value in the range of 1.220v through 10v. it is a function of the inter- nal reference voltage (v ref ) and the ratio of the external feedback resistors as shown in figure 2. the output voltage is found using the equation where v o is the output voltage. the actual value of the internal v ref is a function of v o . the ?orrected?v ref is determined by ? v ref / ? v o is found in the electrical characteristics and is -2.5mv/v for the c-grade. you can get a more accurate indication of the output voltage by replacing the value of v ref in equation (1) with the value found using equation (2). note that the actual output voltage can deviate from that pre- dicted using the typical value of ? v ref / ? v o in equation (2): for c-grade parts, the worst-case ? v ref / ? v o is -2.5mv/v. f or d-grade parts, the worst-case ? v ref / ? v o is -3.0mv/v. t ypical applications figure 1. shunt regulator figure 2. adjustable shunt regulator r s v s v r i l i q -------------------- = (1) v o v ref r2 r1 ------ - ?? ?? 1 + = v ref ? v o ? v ref ? v o ----------------- ?? ?? v y + = v y 1.220v = ? v o v o v y = and where (2) v s r s v r fan4041 i q + i l i l i q v s v o r s fan4041 r1 r2 v o v ref r2 r1 ------ - ?? ?? 1 + =
fan4041 product specification 5 rev. 1.0.5 3/25/04 mechanical dimensions t o-92 package a .170 .210 symbol inches min. max. min. max. millimeters notes b .015 .021 .020 c .014 ? .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 ? a e-pin c 1/16 l b e1 e
fan4041 product specification 6 rev. 1.0.5 3/25/04 mechanical dimensions (continued) sot-23 package a .035 .044 symbol inches min. max. min. max. millimeters notes a1 .0004 .004 .020 b .012 c .003 .008 e .047 .055 e .021 ref h .083 .104 e1 l s d .110 .120 .89 1.12 .01 .10 .50 .30 .08 .20 1.20 1.40 .54 ref .016 nom .395 nom .075 bsc 1.90 bsc .037 bsc .95 bsc 2.10 2.64 2.80 3.04 notes: 1. 2. 3. 4. dimensions are inclusive of plating. dimensions are exclusive of mold flash & metal burr. comply to jedec to-236. this drawing is for matrix leadframe only. d e1 s e e a a1 b h l c
fan4041 product specification 3/25/04 0.0m 005 stock#ds30004041 ? 2000 fairchild semiconductor corporation disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. life support policy fairchild? 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, or (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 significant injury to the user. 2. a critical component is 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 example: fan4041cis3 fan4041 c i s3 x device family grade temperature package tape and reel = x 0.5% = c -40? to 85? = i sot23 = s3 1.0% = d -40? to 125? = e to92 = tl sot-23 package marking information only 3 ?lds of marking are possible on an sot-23. this table gives the meaning of these ?lds. example: fac fa c grade 0.5% = c 1.0% = d
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