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www.fairchildsemi.com rev. 1.0.0 10/13/00 pentium is a registered trademark of intel corporation. features fast transient response low dropout voltage at up to 3a load regulation: 0.05% typical trimmed current limit on-chip thermal limiting standard to-220, to-263, to-263 center cut, and to-252 packages applications pentium class gtl+ bus supply low voltage logic supply post regulator for switching supply 12v to 5v linear regulator description the fan1587a, fan1587a-1.5, and fan1587a-3.3 are low dropout three-terminal regulators with 3a output current capa- bility. these devices have been optimized for low voltage applications including v tt bus termination, where transient response and minimum input voltage are critical. the fan1587a is ideal for low voltage microprocessor applica- tions requiring a regulated output from 1.5v to 3.6v with an input supply of 12v or less. the fan1587a-1.5 offers ?ed 1.5v with 3a current capability for gtl+ bus v tt termina- tion. the fan1587a-3.3 offers ?ed 3.3v current capability for logic ic operation. current limit is trimmed to ensure speci?d output current and controlled short-circuit current. on-chip thermal limiting pro- vides protection against any combination of overload and ambient temperature that would create excessive junction temperatures. the fan1587a, fan1587a-1.5, and fan1587a-3.3 are available in the industry-standard to-220, to-263, to-263 center cut, and to-252 (dpak) power packages. typical applications v in = 12v 10 f 10 f 22 f 124 ? 768 ? 22 f 9v at 3a + + v in adj v out fan1587a v in = 9v 3.3v at 3a + + v in gnd v out fan1587a-3.3 65-1587-16 fan1587a 3a adjustable/fixed low dropout linear regulator
fan1587a product specification 2 rev. 1.0.0 10/13/00 pin assignments adj * ja can vary from 20 c/w to >40 c/w with various mounting techniques. out front view 3-lead plastic to-220 jc = 3 c/w in adj out front view 3-lead plastic to-263 jc = 3 c/w* in 12 3 12 3 gnd out front view in 12 3 gnd out front view fan1587am fan1587am-1.5 fan1587at-1.5, -3.3v fan1587at in 12 3 adj front view 3-lead plastic to-263 center cut jc = 3 c/w* in tab is out. 12 3 gnd front view fan1587amc fan1587amc-1.5, 3.3 in 12 3 adj front view 3-lead plastic to-252 jc = 3 c/w* in tab is out. 123 gnd front view fan1587ad fan1587ad-1.5, 3.3 in 12 3
product specification fan1587a rev. 1.0.0 10/13/00 3 absolute maximum ratings figure 1. absolute maximum safe operating area parameter min. max. unit v in 13.2 v (v in ?v out ) * i out see figure 1 operating junction temperature range 0 125 c storage temperature range -65 150 c lead temperature (soldering, 10 sec.) 300 c 4 3 2 1 0 068 10 12 4 2 v in v out (v) i out (a)
product specification fan1587a rev. 1.0.0 10/13/00 4 electrical characteristics tj = 25 c unless otherwise speci ed. the ? denotes speci cations which apply over the speci ed operating temperature range. notes: 1. see thermal regulation specifications for changes in output voltage due to heating effects. load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. 2. line and load regulation are guaranteed up to the maximum power dissipation (18w). power dissipation is determined by input/output differential and the output currrent. guaranteed maximum output power will not be available over the full input/ output voltage range. 3. fan1587a only. 4. fan1587a-1.5 only. 5. fan1587a-3.3 only. 6. output current must be limited to meet the absolute maximum ratings of the part. parameter conditions min. typ. max units reference voltage 3 1.5v (v in v out ) 5.75v, 10ma i out 3a ? 1.225 (-2%) 1.250 1.275 (+2%) v output voltage 4, 6 3.3v v in 12v 10ma i out 3a ? 1.47 1.5 1.53 v output voltage 5, 6 5.1v v in 12v 10ma i out 3a ? 3.234 3.3 3.366 v line regulation 1, 2 (v out + 1.5v) v in 12v, i out = 10ma ? 0.005 0.2 % load regulation 1, 2 (v in v out ) = 3v 10ma i out 3a ? 0.05 0.5 % dropout voltage ? v ref = 1%, i out = 3a ? 1.150 1.300 v current limit (v in v out ) = 2v ? 3.1 4 a adjust pin current 3 ? 35 120 a adjust pin current change 3, 6 1.5v (v in v out ) 12v, 10ma i out 3a ? 0.2 5 a minimum load current 1.5v (v in v out ) 12v ? 10 ma quiescent current v in = 5v ? 413ma ripple rejection f = 120hz, c out = 22 f tantalum, (v in v out ) = 3v, i out = 3a 60 72 db thermal regulation t a = 25 c, 30ms pulse 0.004 0.02 %/w temperature stability ? 0.5 % long-term stability t a = 125 c, 1000 hrs. 0.03 1.0 % rms output noise (% of v out ) t a = 25 c, 10hz f 10khz 0.003 % thermal resistance, junction to case to-220 3 c/w to-263, to-252 3 c/w thermal shutdown 150 c
fan1587a product specification 5 rev. 1.0.0 10/13/00 typical performance characteristics figure 2. dropout voltage vs. output current figure 3. load regulation vs. temperature figure 4. reference voltage vs. temperature figure 5. output voltage vs. temperature figure 6. minimum load current vs. temperature figure 7. adjust pin current vs. temperature junction temperature ( c) output voltage deviation (%) -75 -50 -25 0 25 50 75 100 125 150 175 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 ? i = 3a 65-1587-04 0.5 1 1.5 output current (a) dropout voltage (v) 2 3.0 2.5 0 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 t=25 c t=0 c t=125 c 65-1587-03 junction temperature ( c) reference voltage (v) -75 -50 -25 0 25 50 75 100 125 150 175 3.70 3.65 3.60 3.55 3.50 3.45 3.40 3.35 3.30 3.25 3.20 v out set with 1% resistors v out = 3.6v 1 v out = 3.3v 2 note: 1. fan1587a only 2. fan1587a, -3.3 65-1587-06 junction temperature ( c) reference voltage (v) -75 -50 -25 0 25 50 75 100 125 150 175 1.260 1.255 1.250 1.245 1.240 1.235 1.230 1.225 1.220 1.215 1.210 65-1587-05 junction temperature ( c) minimum load current (ma) -75 -50 -25 0 25 50 75 100 125 150 175 5 4 3 2 1 0 65-1587-07 junction temperature ( c) adjust pin current ( a) -75 -50 -25 0 25 50 75 100 125 150 175 100 90 80 70 60 50 40 30 20 10 0 65-1587-08 note: 1. fan1587a only
product specification fan1587a rev. 1.0.0 10/13/00 6 typical performance characteristics (continued) figure 8. short-circuit current vs. temperature figure 9. ripple rejection vs. frequency figure 10. maximum power dissipation frequency (hz) ripple rejections (db) 10 100 1k 10k 100k 90 80 70 60 50 40 30 20 10 0 65-1587-10 (v in v out ) 3v 0.5v v ripple 2v i out = 3a junction temperature ( c) short-circuit current (a) -75 -50 -25 0 25 50 75 100 125 150 175 5.0 4.5 4.0 3.5 3.0 65-1587-09 case temperature ( c) power (w) 50 60 70 80 90 100 110 120 130 140 150 20 15 10 5 0 65-1587-11
product specification fan1587a rev. 1.0.0 10/13/00 7 applications information general the fan1587a, fan1587a-1.5, and fan1587a-3.3 are three-terminal regulators optimized for gtl+ v tt termina- tion applications. these devices are short-circuit protected, and offer thermal shutdown to turn off the regulator when the junction temperature exceeds about 150?. the fan1587a series provides low dropout voltage and fast transient response. frequency compensation uses capacitors with low esr while still maintaining stability. this is critical in addressing the needs of low voltage high speed microproces- sor buses like gtl+. stability the fan1587a series require an output capacitor as a part of the frequency compensation. it is recommended to use a 22? solid tantalum or a 100? aluminum electrolytic on the output to ensure stability. the frequency compensation of these devices optimizes the frequency response with low esr capacitors. it is recommended to use bypass capacitors such as a 22? tantalum or a 100? aluminum on the adjust pin of the fan1587a for low ripple and fast transient response. when these bypassing capacitors are not used at the adjust pin, larger values of output capacitors provide equally good results. protection diodes in normal operation, the fan1587a series does not require any protection diodes. for the fan1587a, internal resistors limit internal current paths on the adjust pin. therefore, even with bypass capacitors on the adjust pin, no protection diode is needed to ensure device safety under shortcircuit condi- tions. a protection diode between the input and output pins is usu- ally not needed. an internal diode between the input and out- put pins on the fan1587a series can handle microsecond surge currents of 50a to 100a. even with large value output capacitors it is dif?ult to obtain those values of surge cur- rents in normal operation. only with large values of output capacitance, such as 1000 f to 5000 f, and with the input pin instantaneously shorted to ground can damage occur. a crowbar circuit at the input can generate those levels of cur- rent; a diode from output to input is then recommended, as shown in figure 11. usually, normal power supply cycling or system ?ot plugging and unplugging?will not generate current large enough to do any damage. the adjust pin can be driven on a transient basis 7v with respect to the output, without any device degradation. as with any ic regulator, exceeding the maximum input-to- output voltage differential causes the internal transistors to break down and none of the protection circuitry is then functional. figure 11. optional protection ripple rejection in applications that require improved ripple rejection, a bypass capacitor from the adjust pin of the fan1587a to ground reduces the output ripple by the ratio of v out /1.25v. the impedance of the adjust pin capacitor at the ripple fre- quency should be less than the value of r1 (typically in the range of 100 ? to 120 ? ) in the feedback divider network in figure 11. therefore, the value of the required adjust pin capacitor is a function of the input ripple frequency. for example, if r1 equals 100 ? and the ripple frequency equals 120hz, the adjust pin capacitor should be 22?. at 10khz, only 0.22 f is needed. output voltage the fan1587a regulator develops a 1.25v reference volt- age between the output pin and the adjust pin (see figure 12). placing a resistor r1 between these two terminals causes a constant current to ?w through r1 and down through r2 to set the overall output voltage. normally, this current is the speci?d minimum load current of 10ma. the current out of the adjust pin adds to the current from r1 and is typically 35 a. its output voltage contribution is small and only needs consideration when very precise output voltage setting is required. fan1587a adj c adj r2 r1 65-1587-13 + c2 22 f v out + c1 10 f + in out d1 1n4002 (optional) v in fan1587a-1.5, -3.3 gnd c2 22 f v out c1 10 f + + in out d1 1n4002 (optional) v in
fan1587a product specification 8 rev. 1.0.0 10/13/00 figure 12. basic regulator circuit load regulation it is not possible to provide true remote load sensing because the fan1587a series are three-terminal devices. load regu- lation is limited by the resistance of the wire connecting the regulators to the load. load regulation per the data sheet speci?ation is measured at the bottom of the package. for ?ed voltage devices, negative side sensing is a true kelvin connection with the ground pin of the device returned to the negative side of the load. this is illustrated in figure 13. figure 13. connection for best load regulation for adjustable voltage devices, negative side sensing is a true kelvin connection with the bottom of the output divider returned to the negative side of the load. the best load regu- lation is obtained when the top of resistor divider r1 con- nects directly to the regulator output and not to the load. figure 14 illustrates this point. if r1 connects to the load, then the effective resistance between the regulator and the load would be: r p (1 + r2/r1), r p = parasitic line resistance the connection shown in figure 14 does not multiply r p by the divider ratio. as an example, r p is about four milliohms per foot with 16-gauge wire. this translates to 4mv per foot at 1a load current. at higher load currents, this drop repre- sents a signi?ant percentage of the overall regulation. it is important to keep the positive lead between the regulator and the load as short as possible and to use large wire or pc board traces. figure 14. connection for best load regulation thermal considerations the fan1587a series protect themselves under overload conditions with internal power and thermal limiting circuitry. however, for normal continuous load conditions, do not exceed maximum junction temperature ratings. it is impor- tant to consider all sources of thermal resistance from junc- tion-to-ambient. these sources include the junction-to-case resistance, the case-to-heat sink interface resistance, and the heat sink resistance. thermal resistance speci?ations have been developed to more accurately re?ct device tempera- ture and ensure safe operating temperatures. for example, look at using an fan1587at to generate 3a @ 1.5v 2% from a 3.3v source (3.2v to 3.6v). assumptions: ? in = 3.6v worst case ? out = 1.46v worst case ? out = 3a continuous ? a = 70 c case-to-ambient = 3 c/w (assuming both a heatsink and a thermally conductive material) the power dissipation in this application is: p d = (v in ?v out ) * (i out ) = (3.6 ?1.46) * (3) = 6.42w from the speci?ation table: t j = t a + (p d ) * ( case-to-ambient + jc ) = 70 + (6.42) * (3 + 3) = 109 c the junction temperature is below the maximum rating. fan1587a adj i adj 35 a r2 r1 c2 22 f v out v ref + c1 10 f + 65-1587-14 in v out = v ref (1 + r2/r1) + i adj (r2) out v in fan1587a-1.5, -3.3 gnd r l 65-1587-17 r p parasitic line resistance in out v in fan1587a adj r2* connect r1 to case connect r2 to load * r1* r l 65-1587-15 r p parasitic line resistance in out v in
fan1587a product specification 9 rev. 1.0.0 10/13/00 figure 15. application circuit (fan1587a) table 1. bill of materials for application circuit for the fan1587a item quantity manufacturer part number description c1 1 xicon l16v10 10f, 16v aluminum c2, c3 2 xicon l10v100 100f, 10v aluminum r1 1 generic 124 ? , 1% r2 1 generic 768 ? , 1% u1 1 fairchild fan1587at 3a regulator fan1587a u1 adj c2 100 f r2 768 ? r1 124 ? 65-1587-18 + c3 100 f v out 9v + c1 10 f + v in v out v in 12v junction-to-case thermal resistance is speci?d from the ic junction to the bottom of the case directly below the die. this is the lowest resistance path for heat ?w. proper mounting ensures the best thermal ?w from this area of the package to the heat sink. use of a thermally conductive material at the case-to-heat sink interface is recommended. use a thermally conductive spacer if the case of the device must be electri- cally isolated and include its contribution to the total thermal resistance. the cases of the fan1587a series are directly connected to the output of the device.
fan1587a product specification 10 rev. 1.0.0 10/13/00 mechanical dimensions 3-lead to-263 package a .160 .190 4.06 4.83 symbol inches min. max. min. max. millimeters notes b .020 .036 0.51 0.91 b2 .049 .051 1.25 1.30 c2 .045 .055 1.14 1.40 d .340 .380 8.64 9.65 .380 .405 9.65 10.29 .100 bsc e e l .575 .625 14.61 15.88 .090 .110 2.29 2.79 l1 l2 .055 1.40 .017 .019 0.43 0.78 r 0 8 0 8 notes: 1. dimensions are exclusive of mold flash and metal burrs. 2. standoff-height is measured from lead tip with ref. to datum -b-. 3. foot length is measured with ref. to datum -a- with lead surface (at inner r). 4. dimensiuon exclusive of dambar protrusion or intrusion. 5. formed leads to be planar with respect to one another at seating place -c-. 2.54 bsc e @pkg/ @heatsink d l2 a -c- l c2 l1 r (2 plcs) -a- -b- e-pin b2 b e
product specification fan1587a rev. 1.0.0 10/13/00 11 mechanical dimensions (continued) 3-lead to-263 center cut package a .160 .190 4.06 4.83 symbol inches min. max. min. max. millimeters notes b .020 .036 0.51 0.91 b2 .049 .051 1.25 1.30 c2 .045 .055 1.14 1.40 d .340 .380 8.64 9.65 .380 .405 9.65 10.29 .100 bsc e e l .575 .625 14.61 15.88 .090 .110 2.29 2.79 .050 .070 1.27 1.78 l1 l2 l3 .055 1.40 .017 .019 0.43 0.78 r 0 8 0 8 notes: 1. dimensions are exclusive of mold flash and metal burrs. 2. standoff-height is measured from lead tip with ref. to datum -b-. 3. foot length is measured with ref. to datum -a- with lead surface (at inner r). 4. dimensiuon exclusive of dambar protrusion or intrusion. 5. formed leads to be planar with respect to one another at seating place -c-. 2.54 bsc e @pkg/ @heatsink d l2 l3 a -c- l c2 l1 r (2 plcs) -a- -b- e-pin b2 b e
product specification fan1587a rev. 1.0.0 10/13/00 12 mechanical dimensions (continued) 3-lead to-220 package a .140 .190 3.56 4.83 symbol inches min. max. min. max. millimeters notes b .015 .040 .38 1.02 .070 1.78 b1 .045 1.14 c1 .014 .022 .36 .56 p .139 .161 3.53 4.09 d .560 .650 14.22 16.51 .380 .420 9.65 10.67 .090 .110 2.29 2.79 e e e1 .190 .210 4.83 5.33 .045 1.14 .020 .055 .51 1.40 e3 f h1 .230 .270 5.94 6.87 .080 .115 2.04 2.92 .500 .580 12.70 14.73 j1 l 6.35 bsc .250 bsc l1 .100 .135 2.54 3.43 3 7 3 7 q b1 b e3 l1 l h1 q e e e1 e-pin p c1 j1 d f a (5x) notes: 1. dimension c1 apply for lead finish.
fan1587a product specification 13 rev. 1.0.0 10/13/00 mechanical dimensions (continued) 3-lead to-252 package a .086 .094 2.19 2.39 symbol inches min. max. min. max. millimeters notes b .025 .035 0.64 0.89 .045 1.14 b2 .030 0.76 c .018 .024 0.46 0.61 c2 .018 .023 0.46 0.58 d .210 .245 5.33 6.22 1 4 1 4 3 e .250 .265 6.35 6.73 .090 bsc 2.29 bsc .108 ref 2.74 ref .370 .410 9.40 10.41 e h l .055 .070 1.40 1.78 l1 .035 .080 0.89 2.03 .025 .040 0.64 1.02 .215 5.46 b3 .205 5.21 l3 l4 e b3 @pkg/ @heatsink d l3 a -c- h c2 l l1 -a- = 0 10 -b- e-pin b2 l4 b e notes: 1. 2. 3. 4. 5. 6. dimensions are exclusive of mold flash, metal burrs or interlead protrusion. stand off-height is measured from lead tip with ref. to datum -b-. foot length is measured with ref. to datum -a- with lead surface. thermal pad contour optional within dimension b3 and l3. formed leads to be planar with respect to one another at seating place -c-. dimensions and tolerances per asme y14.5m-1994.
fan1587a product specification 10/13/00 0.0m 003 stock#ds30001587a ? 1998 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 de- vice 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 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. ordering information product number package fan1587am to-263 fan1587amc to-263 center cut fan1587at to-220 fan1587ad to-252 fan1587am-1.5 to-263 fan1587amc-1.5 to-263 center cut fan1587at-1.5 to-220 fan1587ad-1.5 to-252 fan1587am-3.3 to-263 fan1587amc-3.3 to-263 center cut fan1587at-3.3 to-220 fan1587ad-3.3 to-252 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:

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