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www.fairchildsemi.com rev. 1.1.6 7/8/05 features ? ast transient response ? ow dropout voltage at up to 5a load regulation: 0.05% typical ? rimmed current limit on-chip thermal limiting ? ackages: to-220, to-252, to-263 and to-263 centercut applications ? gtl+ bus supply for fc-pga ? ow voltage logic supply post regulator for switching supply 3.3v to 1.5v linear regulator 5v to 1.8v linear regulator description the fan1585a, fan1585a-1.5, and fan1585a-1.8 are low dropout three-terminal regulators with 5a output current capability. these devices have been optimized for low volt- age applications including v tt b us termination for fc-pga, where transient response and minimum input voltage are critical. the fan1585a-1.5 offers ?ed 1.5v with 5a current capabilities for agtl+ bus v tt termination for fc-pga. the fan1585a is ideal for low voltage micro- processor applications requiring a regulated output from 1.5v to 3.6v with an input supply of 5v or less, or for fc-pga applications with signi?ant trace resistance. current limit is trimmed to ensure speci?d output current and controlled short-circuit current. on-chip thermal limit- ing provides protection against any combination of overload and ambient temperature that would create excessive junc- tion temperatures. the fan1585a series regulators are available in the industry- standard to-220, to-252, t o-263 and t o-263 centercut power packages. t ypical applications v in = 3.3v 22 f 22 f 22 f 22 f 1.5v at 5a r1 124 ? r2 24.9 ? + + v in adj v out fan1585a v in = 3.3v 1.5v at 5a + + v in gnd v out fan1585a-1.5 v out = v ref (1 + r2/r1) + i adj ?r2 f an1585a 5a adjustable/fixed low dropout linear regulator
fan1585a product specification 2 rev. 1.1.6 7/8/05 pin assignments *with package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, ja can vary from 30?/w to more than 40?/w. other mounting techniques can provide a thermal resistance lower than 30?/w. absolute maximum ratings absolute maximum safe operating area p arameter min. max. unit v in 18 v operating junction temperature range 0 125 c storage temperature range -65 150 c lead temperature (soldering, 10 sec.) 300 c 3-lead plastic to-220 jc = 3 c/w 3-lead plastic to-252 jc = 3 c/w adj/ gnd front view 3-lead plastic to-263 jc = 3 c/w* in 12 3 adj/ gnd out out front view front view in 12 3 adj/ gnd front view 3-lead plastic to-263 center cut jc = 3 c/w* in tab is out. tab is out. tab is out. 12 3 t ab is v out 1 adj/ gnd out in 23 v in ? out (v) i out (amps) 02468 12 10 14 7 6 5 4 3 2 1 0
product specification fan1585a rev. 1.1.6 7/8/05 3 electrical characteristics tj = 25? unless otherwise speci?d. the ? denotes speci?ations which apply over the speci?d 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. 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. fan1585a only. 4. fan1585a-1.5 only. 5. fan1585a-1.8 only. p arameter conditions min. typ. max units reference voltage 3 1.5v (v in ?v out ) 5.75v, 10ma i out 5a ? 1.225 (-2%) 1.250 1.275 (+2%) v output voltage 4 3.0v v in 8v 10ma i out 5a ? 1.47 1.5 1.53 v output voltage 5 3.3v v in 8.3v 10ma i out 5a ? 1.764 1.8 1.836 v line regulation 1, 2 (v out + 1.5v) v in 12v, i out = 10ma ? 0.005 0.2 % load regulation 1, 2, 3 (v in ?v out ) = 3v, 10ma i out 5a ? 0.05 0.5 % dropout voltage ? v ref = 1%, i out = 5a ? 1.150 1.300 v current limit (v in ?v out ) = 2v ? 5.1 5.9 a adjust pin current 3 ? 35 120 a adjust pin current change 3 1.5v (v in ?v out ) 5.75v, 10ma i out 5a ? 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 = 5a 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, to-252, to-263, and to-263 cc 3 c/w thermal shutdown 150 c
fan1585a product specification 4 rev. 1.1.6 7/8/05 t ypical performance characteristics figure 1. dropout voltage vs. output current figure 2. load regulation vs. temperature figure 3. reference voltage vs. temperature figure 4. output voltage vs. temperature figure 5. minimum load current vs. temperature figure 6. adjust pin current vs. temperature 123 output current (a) dropout voltage (v) 45 6 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 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 = 5a 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 1 note: 1. fan1585a only junction temperature ( c) reference voltage (v) -75 -50 -25 0 25 50 75 100 125 150 175 1.275 1.270 1.265 1.260 1.255 1.250 1.245 1.240 1.235 1.230 1.225 junction temperature ( c) minimum load current (ma) -75 -50 -25 0 25 50 75 100 125 150 175 5 4 3 2 1 0 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 note: 1. fan1585a only
product specification fan1585a rev. 1.1.6 7/8/05 5 t ypical performance characteristics (continued) figure 7. short-circuit current vs. temperature figure 8. ripple rejection vs. frequency figure 9. maximum power dissipation figure 10. stability region v in /v out = 5v/1.5v junction temperature ( c) short-circuit current (a) -75 -50 -25 0 25 50 75 100 125 150 175 8.0 7.0 6.0 5.0 4.0 frequency (hz) ripple rejections (db) 10 100 1k 10k 100k 90 80 70 60 50 40 30 20 10 0 (v in ?v out ) 3v 0.5v v ripple 2v i out = 5a case temperature ( c) power (w) 50 60 70 80 90 100 110 120 130 140 150 20 15 10 5 0 0 0.5 1 1.5 2 2.5 0 1000 2000 3000 4000 5000 load current (ma) output capacitance esr, ( ? ) area of instability stable area
fan1585a product specification 6 rev. 1.1.6 7/8/05 applications information general the fan1585a and fan1585a-1.5 are three-terminal regu- lators optimized for gtl+ v tt termination and logic appli- cations. these devices are short-circuit protected and offer thermal shutdown to turn off the regulator when the junction temperature exceeds about 150?. the fan1585a 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 microprocessor buses like gtl+. stability the fan1585a series requires 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. in general, it is suggested to use capacitors with an esr of <300m ? . it is also recommended to use bypass capacitors such as a 22? tantalum or a 100? alumi- num on the adjust pin of the fan1585a for low ripple and f ast transient response. when these bypassing capacitors are not used at the adjust pin, larger values of output capacitors provide equally good results. refer to typical performance characteristics for graph of stability of output capacitance esr vs load current. protection diodes in normal operation, the fan1585a series does not require any protection diodes. for the fan1585a, 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 short-circuit condi- tions. a protection diode between the input and output pins is usually not needed. an internal diode between the input and the output pins on the fan1585a series can handle micro- second surge currents of 50a to 100a. even with large value output capacitors it is dif?ult to obtain those values of surge currents in normal operation. only with large values of output capacitance, such as 1000? to 5000?, 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 10. 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 ?v with respect to the output, without any device degradation. as with any ic regulator, exceeding the maximum input-to- output v oltage differential causes the internal transistors to break do wn and none of the protection circuitry is then func- tional. figure 10. optional protection ripple rejection in applications that require improved ripple rejection, a bypass capacitor from the adjust pin of the fan1585a to ground reduces the output ripple by the ratio of v out /1.25v. the impedance of the adjust pin capacitor at the ripple frequency should be less than the value of r1 (typically in the range of 100 ? to 120 ? ) in the feedback divider network in figure 10. therefore, the value of the required adjust pin capacitor is a function of the input ripple frequency. for e xample, if r1 equals 100 ? and the ripple frequency equals 120hz, the adjust pin capacitor should be 22?. at 10khz, only 0.22? is needed. output voltage the fan1585a regulator develops a 1.25v reference volt- age between the output pin and the adjust pin (see figure 11). 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?. its output voltage contribution is small and only needs consideration when a very precise out- put voltage setting is required. fan1585a adj c adj r2 r1 + c2 22 f v out + c1 22 f + in out d1 1n4002 (optional) v in fan1585a-1.5 gnd c2 22 f v out c1 22 f + + in out d1 1n4002 (optional) v in
product specification fan1585a rev. 1.1.6 7/8/05 7 figure 11. basic regulator circuit load regulation it is not possible to provide true remote load sensing because the fan1585a 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. f or ?ed voltage devices, negative side sensing is a true k elvin connection with the ground pin of the device returned to the negative side of the load. this is illustrated in figure 12. figure 12. connection for best load regulation f or adjustable voltage devices, negative side sensing is a true k elvin 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 the resistor divider r1 con- nects directly to the regulator output and not to the load. figure 13 illustrates this point. if r1 connects to the load, then the effective resistance between the regulator and the load would be: r p x (1 + r2/r1), r p = parasitic line resistance the connection shown in figure 13 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 13. connection for best load regulation thermal considerations the fan1585a series protect themselves under overload conditions with internal power and thermal limiting circuitry. however, for normal continuous load conditions, do not e xceed 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. f or example, look at using an fan1585at to generate 5a @ 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 = 5a continuous ? a = 50 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) * (5) = 10.7w from the speci?ation table: t j = t a + (p d ) * ( case-to-ambient + jc ) = 50 + (10.7) * (3 + 3) = 115 c the junction temperature is below the maximum rating. fan1585a adj i adj 35 a r2 r1 c2 22 f v out v ref + c1 22 f + in v out = v ref (1 + r2/r1) + i adj (r2) out v in fan1585a-1.5 gnd r l r p parasitic line resistance in out v in fan1585a adj r2* connect r1 to case connect r2 to load * r1* r l r p parasitic line resistance in out v in
fan1585a product specification 8 rev. 1.1.6 7/8/05 figure 14. application circuit (fan1585a) ta b le 1. bill of materials for application circuit for the fan1585a figure 15. application circuit (fan1585a-1.5) ta b le 2. bill of materials for application circuit for the fan1585a-1.5 item quantity manufacturer part number description c1 1 xicon l10v22 22?, 10v aluminum c2, c3 2 xicon l10v100 100?, 10v aluminum r1 1 generic 124 ? , 1% r2 1 generic 24.9 ? , 1% u1 1 fairchild fan1585at 5a regulator item quantity manufacturer part number description c1 1 xicon l10v22 22?, 10v aluminum c3 1 xicon l10v100 100?, 10v aluminum u1 1 fairchild fan1585at-1.5 5a regulator fan1585a u1 adj c2 100 f r2 24.9 ? r1 124 ? + c3 100 f v out 1.5v + c1 22 f + v in v out v in 3.3v fan1585a-1.5 u1 gnd c3 100 f v out 1.5v + c1 22 f + v in v out v in 3.3v 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 fan1585a series are directly connected to the output of the device.
product specification fan1585a rev. 1.1.6 7/8/05 9 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
fan1585a product specification 10 rev. 1.1.6 7/8/05 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 fan1585a rev. 1.1.6 7/8/05 11 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 ? .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 .060 .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 ? c1 j1 d f a (5x) notes: 1. dimension c1 apply for lead finish.
fan1585a product specification 12 rev. 1.1.6 7/8/05 mechanical dimensions (continued) 3-lead to-252 package d d1 gage plane notes: unless otherwise specified a) all dimensions are in millimeters. b) this package conforms to jedec, to-252, issue c. variation aa & ab, dated nov. 1999. c) dimensioning and tolerancing per asme y14.5?994. d) heat sink top edge could be in chamfered corners or edge protrusion. e) dimensions l3, d, e1 & d1 table: option aa option ab 0.89 ?1.27 1.52 ?2.03 5.97 ?6.22 5.33 ?5.59 4.32 min 3.81 min 5.21 min l3 d e1 d1 4.57 min 0.51 seating plane detail a (1.54) 1.78 1.40 0.61 0.48 10 0 0.127 max (rotated ?0 scale 12x e1 l3 1 1 2 3 1 2 3 4 3 4 6.73 6.35 1.02 0.84 6.25 6.00 min 6.50 min 4.80 2.38 2.18 0.58 0.48 0.10 b 10.41 9.40 see detail a 3.00 min 1.40 min land pattern recommendation 1.14 0.78 0.89 0.54 see note d (0.59) 2.29 5.46 5.21 4.57 0.25 a c mm 2.90 2.30 c a b
fan1585a product specification 7/8/05 0.0m 001 stock#ds30001585 ? 2005 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 product number package fan1585amx to-263 in tape and reel fan1585amcx to-263 center cut in tape and reel fan1585at to-220 fan1585am15x to-263 in tape and reel fan1585amc15x to-263 center cut in tape and reel fan1585at15 to-220 fan1585am18x to-263 in tape and reel fan1585amc18x to-263 center cut in tape and reel fan1585at18 to-220 fan1585ad to-252 fan1585adx to-252 in tape and reel

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