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www.fairchildsemi.com rev. 1.0.5 7/13/00 features fast transient response low dropout voltage at up to 7a load regulation: 0.05% typical trimmed current limit on-chip thermal limiting standard to-220, to-263 and to-263 center cut packages applications pentium class gtl+ bus supply low voltage logic supply post regulator for switching supply description the rc1584 and rc1584-1.5 are low dropout three-terminal regulators with 7a output current capability. these devices have been optimized for low voltage applications including v tt bus termination, where transient response and minimum input voltage are critical. the rc1584 is ideal for low voltage microprocessor applications requiring a regulated output from 1.5v to 3.6v with an input supply of 5v or less. the rc1584-1.5 offers ?ed 1.5v with 7a current capabil- ity for gtl+ bus v tt termination. current limit is trimmed to ensure speci?d output current and controlled short-circuit current. on-chip thermal limiting provides protection against any combination of overload and ambient temperature that would create excessive junction temperatures. the rc1584 and rc1584-1.5 are available in the industry- standard to-220, to-263 and to-263 center cut power packages. typical applications v in = 3.3v 10 f 10 f 22 f 124 ? 24.9 ? 22 f 1.5v at 7a + + v in adj v out rc1584 v in = 3.3v 1.5v at 7a + + v in gnd v out rc1584-1.5 65-1584-16 rc1584 7a adjustable/fixed low dropout linear regulator pentium is a registered trademark of intel corporation.
rc1584 product specification 2 rev. 1.0.5 7/13/00 pin assignments absolute maximum ratings parameter min. max. unit v in 7v operating junction temperature range 0 125 c storage temperature range -65 150 c lead temperature (soldering, 10 sec.) 300 c 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 rc1584m rc1584m-1.5 rc1584t-1.5 rc1584t 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 rc1584mc rc1584mc-1.5 in 12 3 65-1584-02
product specification rc1584 rev. 1.0.5 7/13/00 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 (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. rc1584 only. 4. rc1584-1.5 only. parameter conditions min. typ. max units reference voltage 3 1.5v (v in ?v out ) 5.75v, 10ma i out 7a ? 1.225 (-2%) 1.250 1.275 (+2%) v output voltage 4 3.3v v in 7v 10ma i out 7a ? 1.47 1.5 1.53 v line regulation 1, 2 (v out + 1.5v) v in 7v, i out = 10ma ? 0.005 0.2 % load regulation 1, 2 (v in ?v out ) = 3v 10ma i out 7a ? 0.05 0.5 % dropout voltage ? v ref = 1%, i out = 7a ? 1.150 1.300 v current limit (v in ?v out ) = 2v ? 7.1 8 a adjust pin current 3 ? 35 120 a adjust pin current change 3 1.5v (v in ?v out ) 5.75v, 10ma i out 7a ? 0.2 5 a minimum load current 1.5v (v in ?v out ) 5.75v ? 10 ma quiescent current v in = 5v ? 413ma ripple rejection f = 120hz, c out = 22 f tantalum, (v in ?v out ) = 3v, i out = 7a 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 3 c/w thermal shutdown 150 c
rc1584 product specification 4 rev. 1.0.5 7/13/00 typical 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) 5 47 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 65-1584-03 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 = 7a 65-1584-04 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 65-1584-05 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 note: 1. rc1584 only 65-1584-06 junction temperature ( c) minimum load current (ma) -75 -50 -25 0 25 50 75 100 125 150 175 5 4 3 2 1 0 65-1584-07 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 65-1584-08 note: 1. rc1584 only
product specification rc1584 rev. 1.0.5 7/13/00 5 typical performance characteristics (continued) figure 7. short-circuit current vs. temperature figure 8. ripple rejection vs. frequency figure 9. maximum power dissipation frequency (hz) ripple rejections (db) 10 100 1k 10k 100k 90 80 70 60 50 40 30 20 10 0 65-1584-10 (v in v out ) 3v 0.5v v ripple 2v i out = 7a junction temperature ( c) short-circuit current (a) -75 -50 -25 0 25 50 75 100 125 150 175 10 9 8 7 6 65-1584-09 case temperature ( c) power (w) 50 60 70 80 90 100 110 120 130 140 150 20 15 10 5 0 65-1584-11
rc1584 product specification 6 rev. 1.0.5 7/13/00 applications information general the rc1584 and rc1584-1.5 are three-terminal regulators optimized for gtl+ v tt termination applications. these devices are short-circuit protected, and offer thermal shut- down to turn off the regulator when the junction temperature exceeds about 150?. the rc1584 series provides low drop- out voltage and fast transient response. frequency compen- sation uses capacitors with low esr while still maintaining stability. this is critical in addressing the needs of low volt- age high speed microprocessor buses like gtl+. stability the rc1584 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. in general, it is suggested to use capacitors with an esr of <1 ? . it is also recommended to use bypass capacitors such as a 22? tantalum or a 100? aluminum on the adjust pin of the rc1584 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 rc1584 series does not require any protection diodes. for the rc1584, 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 conditions. 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 rc1584 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 10. usually, normal power supply cycling or system ?ot plugging and unplugging?will not generate cur- rent 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 10. optional protection ripple rejection in applications that require improved ripple rejection, a bypass capacitor from the adjust pin of the rc1584 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 10. 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 rc1584 regulator develops a 1.25v reference voltage 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 a. its output voltage contribution is small and only needs consideration when very precise output voltage setting is required. rc1587 adj c adj r2 r1 65-1587-13 + c2 22 f v out + c1 10 f + in out d1 1n4002 (optional) v in rc1587-1.5, -3.3 gnd c2 22 f v out c1 10 f + + in out d1 1n4002 (optional) v in rc1584 adj c adj r2 r1 65-1584-13 + c2 22 f v out + c1 10 f + in out d1 1n4002 (optional) v in rc1584-1.5 gnd c2 22 f v out c1 10 f + + in out d1 1n4002 (optional) v in
product specification rc1584 rev. 1.0.5 7/13/00 7 figure 11. basic regulator circuit load regulation it is not possible to provide true remote load sensing because the rc1584 series are three-terminal devices. load regula- tion 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 12. figure 12. 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 13 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 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 rc1584 series protect themselves under overload condi- tions 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 rc1584t to generate 7a @ 1.5v 2% from a 3.3v source (3.135v to 3.465v). assumptions: ? in = 3.465v worst case ? out = 1.47v worst case ? out = 7a continuous ? a = 40 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 ) = (3.465 ?1.47) * (7) = 13.97w from the speci?ation table: t j = t a + (p d ) * ( case-to-ambient + jc ) = 40 + (13.97) * (3 + 3) = 124 c the junction temperature is below the maximum rating. rc1584 adj i adj 35 a r2 r1 c2 22 f v out v ref + c1 10 f + 65-1584-14 in v out = v ref (1 + r2/r1) + i adj (r2) out v in rc1584-1.5 gnd r l 65-1584-17 r p parasitic line resistance in out v in rc1584 adj r2* connect r1 to case connect r2 to load * r1* r l 65-1584-15 r p parasitic line resistance in out v in
rc1584 product specification 8 rev. 1.0.5 7/13/00 figure 14. application circuit (rc1584) table 1. bill of materials for application circuit for the rc1584 figure 15. application circuit (rc1584-1.5) table 2. bill of materials for application circuit for the rc1584-1.5 item quantity manufacturer part number description c1 1 xicon l10v10 10f, 10v aluminum c2, c3 2 xicon l10v100 100f, 10v aluminum r1 1 generic 124 ? , 1% r2 1 generic 24.9 ? , 1% u1 1 fairchild rc1584t 7a regulator item quantity manufacturer part number description c1 1 xicon l10v10 10f, 10v aluminum c3 1 xicon l10v100 100f, 10v aluminum u1 1 fairchild rc1584t-1.5 7a regulator rc1584 u1 adj c2 100 f r2 24.9 ? r1 124 ? 65-1584-18 + c3 100 f v out 1.5v + c1 10 f + v in v out v in 3.3v rc1584-1.5 u1 gnd 65-1584-19 c3 100 f v out 1.5v + c1 10 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 rc1584 series are directly con- nected to the output of the device.
product specification rc1584 rev. 1.0.5 7/13/00 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
rc1584 product specification 10 rev. 1.0.5 7/13/00 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 rc1584 rev. 1.0.5 7/13/00 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 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.
rc1584 product specification 7/13/00 0.0m 001 stock#ds30001584 ? 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 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 rc1584m to-263 rc1584mc to-263 center cut rc1584t to-220 rc1584m-1.5 to-263 rc1584mc-1.5 to-263 center cut rc1584t-1.5 to-220
product folder - fairchild p/n rc1584x15 - 8a fixed 1.5v low dropout voltage regulator (ldo) fairchild semiconductor space space space search | parametric | cross reference 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 rc1584x15 8a fixed 1.5v low dropout voltage regulator (ldo) 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 rc1584 and rc1584-1.5 are low dropout three-terminal regulators with 7a output current capability. these devices have been optimized for low voltage applications including vtt bus termination, where transient response and minimum input voltage are critical. the rc1584 is ideal for low voltage microprocessor applications requiring a regulated output from 1.5v to 3.6v with an input supply of 5v or less. the rc1584-1.5 offers fixed 1.5v with 7a current capabil-ity for gtl+ bus vtt termination. current limit is trimmed to ensure specified output current and controlled short-circuit current. on-chip thermal limiting provides protection against any combination of overload and ambient temperature that would create excessive junction temperatures. the rc1584 and rc1584-1.5 are available in the industry-standard to-220, to-263 and to- 263 center cut power packages. back to top features l fast transient response l low dropout voltage at up to 7a l load regulation: 0.05% typical l trimmed current limit l on-chip thermal limiting l standard to-220, to-263 and to-263 center cut packages space datasheet download this datasheet pdf e-mail this datasheet [e- mail] this page print version file:///c|/pdf/rc1584x15.html (1 of 2) [27-jul-02 10:44:11 am]
product folder - fairchild p/n rc1584x15 - 8a fixed 1.5v low dropout voltage regulator (ldo) back to top applications l pentium? class gtl+ bus supply l low voltage logic supply l post regulator for switching supply back to top product status/pricing/packaging product product status pricing* package type leads package marking packing method RC1584T15 full production $0.70 to-220ab 3 $y&z&2&t 1584t15 rail rc1584m15 full production $0.74 to-263(d2pak) 3 $y&z&2&t 1584m15 c rail * 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:///c|/pdf/rc1584x15.html (2 of 2) [27-jul-02 10:44:11 am]
product folder - fairchild p/n rc1584 - 7a adjustable low dropout voltage regulator (ldo) fairchild semiconductor space space space search | parametric | cross reference 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 rc1584 7a adjustable low dropout voltage regulator (ldo) 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 rc1584 and rc1584-1.5 are low dropout three-terminal regulators with 7a output current capability. these devices have been optimized for low voltage applications including vtt bus termination, where transient response and minimum input voltage are critical. the rc1584 is ideal for low voltage microprocessor applications requiring a regulated output from 1.5v to 3.6v with an input supply of 5v or less. the rc1584-1.5 offers fixed 1.5v with 7a current capabil-ity for gtl+ bus vtt termination. current limit is trimmed to ensure specified output current and controlled short-circuit current. on-chip thermal limiting provides protection against any combination of overload and ambient temperature that would create excessive junction temperatures. the rc1584 and rc1584-1.5 are available in the industry-standard to-220, to-263 and to- 263 center cut power packages. back to top features l fast transient response l low dropout voltage at up to 7a l load regulation: 0.05% typical l trimmed current limit l on-chip thermal limiting l standard to-220, to-263 and to-263 center cut packages space datasheet download this datasheet pdf e-mail this datasheet [e- mail] this page print version file:///c|/pdf/rc1584.html (1 of 2) [27-jul-02 10:44:13 am]
product folder - fairchild p/n rc1584 - 7a adjustable low dropout voltage regulator (ldo) back to top applications l pentium? class gtl+ bus supply l low voltage logic supply l post regulator for switching supply back to top product status/pricing/packaging product product status pricing* package type leads package marking packing method rc1584m full production $0.74 to-263(d2pak) 3 $y&z&2&t rc1584m c rail rc1584t full production $0.70 to-220ab 3 $y&z&2&t rc1584t rail rc1584mt full production $0.74 to-263(d2pak) 3 $y&z&2&t rc1584m c tape reel * 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:///c|/pdf/rc1584.html (2 of 2) [27-jul-02 10:44:13 am]

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