bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com 4.0a low dropout voltage regulator B1582 adjustable & fix output pin connection ordering information devices package temp. B1582t to-220 0 c to 70 c B1582s to-263 0 c to 70 c B1582j lpdd 0 c to 70 c description the bay linear B1582 is m onolithic low power 4.0a adjustable and fixed npn voltage regulator that are easy to use with minimum external co mponents. it is suitable for applications requiring a well-regulated positive output voltage with low input-output different ial voltage requirements and output voltage 1.5v, 2.5v, 3.0v, 3.3v, or 5v. the B1582 outstanding features include full power usage up to 4.0amp of load current internal current limiting and thermal shutdown. other fixed versions ar e also available consult with factory. the B1582 is offered in a 5-pin to-220, & to-263 packages compatible with other 5 terminal regulators. the B1582 is offer in a new lpdd (low profile to-263) package from 4.47 mm (dd) thickness down to only 1.27 mm (lpdd) total thickness. features ? adjustable output down to 1.2v ? fixed output voltages 2.5v, 3.0v 3.3v, and 5.0v ? output current of 4.0a ? low dropout voltage 700mv typ. ? current & thermal limiting ? standard 3-terminal low cost to-220, d 2 packages & lpdd ? similar to industry standard cs1503/ez1582/iru1150 applications ? 3.3v to 2.5v for pentium processor ? smps post regulator ? high efficiency ?green? computer systems ? high efficiency linear power supplies ? 5v to 3.xxv for pentium processor ? 3.3v to 2.7v intel i740 chip set v power output 1 2 3 4 5 v control adj/gnd. sense to-263-5 package v power v power output 1 2 3 4 5 v control v control adj/gnd. sense to-263-5 package bay linear inspire the linear power
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com B1582 absolute maximum rating parameter symbol value unit maximum input voltage v in 7 v power dissipation p o internally limited w thermal resistance junction to case jc 3 thermal resistance junction to ambient ja 50 c/w operating junction temperature range control section power transistor t j 0 to 125 0 to 150 storage temperature range t stg -65 to 150 lead temperature (soldering 10 sec.) t lead 260 c electrical characteristics (v in = 2.05v to 5.25v; i o = 10ma to 4.0amp, unless otherwise specified) parameter symbol conditions min typ max unit 1.485 1.515 v cont =4v, v pwr =2v v cont =3v, v pwr =2.3v, i load =10ma to 4a 1.475 1.5 1.525 2.475 2.525 v cont =5v, v pwr =3.3v v cont =4v, v pwr =3.3v, i load =10ma to 4a 2.460 2.5 2.540 2.970 3.030 v cont =5.5v, v pwr =3.5v v cont =4.5v, v pwr =3.8v, i load =10ma - 4a 2.950 3.0 3.050 3.267 3.333 v cont =5.8v, v pwr =3.8v v cont =4.8v, v pwr =4.1v, i load =10ma - 4a 3.247 3.3 3.353 4.950 5.050 output voltage v o v cont =7.5v, v pwr =5.5v v cont =6.5v, v pwr =5.8v, i load =10ma- 4a 4.920 5.0 5.080 v 1.238 1.262 reference voltage v ref v cont =2.75v, v pwr =2v, i load =10ma v cont =2.7v, to 12v v pwr =3.3v to 5.5v, i load =10ma to 4a 1.230 1.250 1.270 v line regulation (1) reg (line) i o = 10ma, v in =5v, t= 25 c 0.04 0.2 0.08 0.40 load regulation (1) reg (load) i o = 10ma, v in =5v, t= 25 c % dropout voltage v pwr -v out v cont =v out +2.5v, i load =1.5a v cont =v out +2.5v, i load =3.0a v cont =v out +2.5v, i load =4.0a 0.26 0.50 0.70 0.38 0.70 0.80 v minimum load current i min 5 10 ma current limit i s (v in -v out )=3v 3 5 a ground pin current i q v in =5v 5 10 ma temperature stability t s i o = 10ma, v in =5v 0.5 % thermal regulation t= 25 c, 30ms pulse 0.003 %/w ripple rejection r a t= 25 c, v in =5v 60 75 db thermal resistance - to-220 junction to tab junction to ambient dd package junction to tab junction to ambient 3.0 60 3.0 60 3.0 60 3.0 60 c/w note: output switch tests are performed under pul sed conditions to minimize power dissipation
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com B1582 pin description 1. sense = allows kelvin sense of v out at the load. (positive side of the reference voltage of the device). 2. adj = negative side of the reference volta ge for the device. adding a small bypass capacitor from the adj pin to ground will improve the transient response. 3. v out = power output of the device. 4. v ctrl = supply pin for the control circuitry of the device. the current flow into this pin will be about 1% of the output current. v ctrl must be between 1.0v a nd 1.3v greater than the output voltage for the device to regulate. 5. v in = output load current is supplied through this pin. v in must be between 0.1v and 0.8v greater than the output voltage for the device to regulate. block diagram
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com B1582 applications notes the B1582 is designed as a high performance and low cost solution for application requiring a lower dropout than traditional npn regulators. the B1582 uses a separate input voltage v ctrl (v ctrl v out + 1.3v) to minimize the dropout voltage. this allows the 2.5v power for the load to come from a 3.3v system supply. as added benefit this will reduce the heat dissipation, and lower heat sink and cooling fa n cost. a typical application would use 5v for vin and 3.3v for v ctrl from a motherboard power supply to provide a nomin al 2.5v output. using the sense pin allows to kelvin measure the output, reducing resistive-associated errors. the B1582 can power the 2.5v core voltage for microprocessors such as pentium ? , p55c ? , amd5k86 ? and k6 ? and the ibm powerpc ? 603ev and 604ev processors. *the reduction of heat dissipati on is a result of the increase of the regulator efficiency (efficiency = v out / v in ). adjustable regulator design 1.25v reference voltage is being developed between the sense pin and the adj pin of the as1582. adding two external resistors (see fig 1.) will allow setting the output voltage from 1.25v to 6v. r 1 is chosen so that this current is specified minimum load current of 10ma. r 2 is given by the formula: v out = v ref (1+ r 2 /r 1 ) + i adj (r 2 ). the current flowing from the adj pin is typically 50 a. this adj pin contributes to the final vout but is usually neglected. connecting the sense pin to the top of the resistor divider will improve load regulation. lowering noise using the sense pin to kelvin the load will increase accuracy of the output voltage during load regulation. for the fixed voltage devices, a dding a capacitor at the gnd pin will improve transient response. this capacitor is chosen in the range of 1 f to 0.1 f and will depend on the amount of output capacitance in the system. typical application bay linear B1582 sense adj v in v ctrl r1 124 c4 2 x 330uf c2 10uf c1 330uf 5v v ctrl 3.3v v in 1 2 3 4 5 c3 .033uf (1) v ctrl needed when v in < 5v. (2) v out = v ref (1 + r2/ r1) + i adj r2. (3) v ref is measured across adjust to sense. 2.5v v out ? r1 124 ? v out fig. 1 adjustable regulator
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com B1582 B1582 B1582-1.5 B1582-1.5 B1582 B1582-2.5 B1582
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com B1582 B1582 B1582 only
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com B1582 package demention to-263-5 to-220-5 0.405 0.005 0.055 (1.397) 0.356 0.005 (10.287 0.127) (9.042 0.127) (15.24 0.635) 0.600 0.025 (1.702 0.127) 0.067 0.005 (0.813 0.076) 0.032 0.003 0.176 0.005 (4.470 0.127) 0.050 0.002 (1.270 0.051) 0.015 + - 0.003 0 8 (0.381 0.074) + - 0.100 0.010 (2.540 0.254) 0.108 + - 0.005 (2.74 + - 2.74) 0.400 + - 0.005 (10.16 + - 0.13) 0.150 d + - 0.005 (3.81d + - 0.13) 0.175 + - 0.005 (4.45 + - 0.13) 0.050 + - 0.005 (1.27 + - 0.13) 0.250 + - 0.005 (6.35 + - 0.13) 0.590 + - 0.005 (14.99 + - 0.13) seating plane 0.547 + - 0.005 (13.89 + - 0.005) 0.067 + - 0.005 (1.70 + - 0.127) 0.268 ref (6.81 ref) 0.268 ref 0.032 + - 0.005 (0.81 + - 0.13) 0.015 + - 0.005 (0.38 + - 0.13) 0.105 + - 0.005 (2.67 + - 0.13) 1.137 ref (28.88 ref) 7 typ.
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com B1582 advance information - these data sheets contain descriptions of products that are in development. the specifications are based on the engineering ca lculations, computer simulations and/ or initial prototype evaluation. preliminary information - these data sheets contain minimum and maximum specifications th at are based on the initial devi ce characterizations. these lim its are subject to change upon the completion of the full characterization over the specif ied temperature and supply voltage ranges. the application circuit examples are only to explain the repres entative applications of the devices and are not intended to gua rantee any circuit design or permit any industrial property right to other rights to execute. bay linear takes no responsibility for any problems related to any industrial property right resulting from the use of the contents shown in the da ta book. typical parameters can and do vary in different applications. customer?s technical experts must validate all operating parameters including ? typical? for each customer applic ation. life support and nuclear policy bay linear products are not authorized fo r and should not be used within life suppor t systems which are intended for surgical implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications wi thout the specific written consent of bay linear president.
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