3A High Current, Low Dropout Voltage Regulator Adjustable, Fast Response Time
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1 SPX High Currnt, ow Dropout Voltag Rgulator djustabl, Fast Rspons Tim FTURS djustabl Output Down To 1.25V 1% Output ccuracy Output Currnt of 3 ow Dropout Voltag of 3 xtrmly Fast Transint Rspons RvrsBattry Protction Zro Currnt Shutdown (5 pin vrsion) Standard TO220 and TO263 Packags PPICTIONS Powring VG & Sound Card PowrPC Supplis SMPS Post Rgulator High fficincy Grn Computr Systms High fficincy inar Powr Supplis Constant Currnt Rgulators djustabl Powr Supplis Battry Chargr Rfr to pag 7 for pinouts. Now vailabl in ad Fr Packaging Th SPX29302 is a 3, highly accurat voltag rgulator with a low drop out voltag of 370mV 3. Ths rgulators ar spcifically dsignd for low voltag applications that rquir a low dropout voltag and a fast transint rspons. Fault protction faturs includ ovrcurrnt, rvrs battry, and positiv and ngativ voltag transints. OnChip trimming adjusts th rfrnc voltag to 1% initial accuracy. Th SPX29302 is offrd in 5pin TO220 & TO263 packags. DSCRIPTION TYPIC PPICTION S CIRCUIT V IN 1 SPX V OUT 6.8µF R1 GND DJ 10µF R2 Figur 1. djustabl Output inar Rgulator 1
2 BSOUT MXIMUM RTINGS ad Tmpratur (soldring, 5 sconds) C Storag Tmpratur Rang...65 C to +150 C Oprating Junction Tmpratur Rang...40 C to +125 C Input Voltag (Not 7)... 16V CTRIC CHRCTRISTICS (Not 1) at V IN =V OUT + 1V and I OUT = 10m, C IN = 6.8µF, C OUT = 10µF, T j = 25 C, unlss othrwis spcifid. Th Boldfac applis ovr th junction tmpratur rang. SPX29302 PRMTR CONDITIONS TYP MIN MX UNITS in Rgulation I OUT =10m,(V OUT +1V) V IN 16V % oad Rgulation V IN =V OUT +5V, 10m I OUT I F (Not 2) % V/ T V OUT Tmp Cofficint (Not 6) ppm/ C Dropout Voltag, xcpt I OUT =100m mv 1.8V, (Not 3) I OUT = I OUT = Ground Currnt I OUT =1.5, V IN =V OUT +1V m (Not 5) I OUT = Ground Pin Currnt V IN =0.5V lss than spcifid V OUT, 1.7 m at Dropout I OUT =10m Currnt imit V OUT =0V (Not 4) Output Nois Voltag C =10µF 400 µv RMS (10Hz to 100kHz) I =100m C =33µF 260 Rfrnc Voltag V MX Rfrnc Voltag (Not 8) V djust Pin Bias Currnt n 120 Rfrnc Voltag (Not 7) 20 ppm/ C Tmp. Coff. djust Pin Bias 0.1 n/ C Currnt Tmp. Coff. NB Input Input ogic Voltag ow (OFF) V IN <10V 0.8 V High (ON) 2.4 NB Input Pin V N =16V µ 750 V N =0.8V 1 µ 2 Rgulator Output (Not 10) µ Currnt in Shutdown Thrmal Rsistanc TO220 Junction to Cas, at Tab 2 C/W TO220 Junction to mbint 60 TO263 Junction to Cas, at Tab 2 TO263 Junction to mbint 60 NOTS: Not 1: Maximum positiv supply voltag of 20V must b of limitd duration (<100mscond) < 1% and duty cycl of lss than 1%. Th maximum continuous supply voltag is 16V. Not 2: Full load currnt (I F ) is dfind as 3.0. Not 3: Dropout voltag is dfind as th input to output diffrntial whn th output voltag drops to 99% of its nominal valu. Not 4: V IN = V OUT (NOMIN) +1V. For xampl, us V IN = 4.3V for a 3.3V rgulator. mploy pulststing procdurs to minimiz tmpratur ris. Not 5: Ground pin currnt is th rgulator quiscnt currnt. Th total currnt drawn from th sourc is th sum of th load currnt to th ground currnt. Not 6: Output voltag tmpratur cofficint is dfind as th worst cas voltag chang dividd by th total tmpratur rang Not 7: Thrmal rgulation is dfind as th chang in output voltag at tim T aftr a chang in powr dissipation is applid, xcluding load / lin rgulation ffcts. Spcifications for a 200m load puls as V IN = 16V (a 4W puls) for t = 10ms. Not 8: V RF V OUT (V IN 1), 2.3V V IN 16V, 10m I I F, T j T jmax. Not 9: Comparator thrshold is xprssd in trms of a voltag diffrntial at th djust trminal blow th nominal rfrnc voltag masurd 6V input. To xprss ths thrsholds in trms of output voltag chang, multiply th rror amplifir gain = V OUT /V RF = (R1 + R2)/R2. For xampl, at a programmabl output voltag of 5V, th rror output is guarantd to go low whn th output drops by 95mVx 5V/ 1.240V = 38mV. Thrshold rmain constant as a prcnt of V OUT as V OUT is varid, with th dropout warning occurring at typically 5% blow nominal, 7.7% guarantd. Not 10: V N 0.8V and V IN 16V, V OUT = 0. 2
3 BOCK DIGRM IN OUT FG 1.180V 1.240V + Rfrnc + O.V I IMIT 28V R1* DJ N Thrmal Shutdown R2* GND TYPIC PRFORMNC CHRCTRISTICS Vdropout (mv) C 85 C C = 10µF Vin = 3.2V I () Vout (V) V OUT =2.5V I = 10m C = 10µF Vin (V) Figur 2. Dropout Voltag vs oad Currnt Figur 3. in Rgulation Ignd (m) C 25 C Vin = 4.3V C = 10µF I () Figur 4. Ground Currnt vs oad Currnt Figur 5. oad Rgulation Vout (V ) V IN = 4.3V C = 10µF I () Vth (V) Tmpratur ( o C) Figur 6. nabl Thrshold vs Tmpratur 3
4 PPICTION INFORMTION Th SPX29302 incorporats protction against ovrcurrnt faults, rvrsd load insrtion, ovr tmpratur opration, and positiv and ngativ transint voltag. Thrmal Considrations lthough th SPX29302 offrs limiting circuitry for ovrload conditions, it is still ncssary to insur that th maximum junction tmpratur is not xcdd in th application. Hat will flow through th lowst rsistanc path, th junctiontocas path. In ordr to insur th bst thrmal flow of th componnt, propr mounting is rquird. TO220 Dsign xampl: ssum that V IN = 10V, V OUT = 5V, I OUT = 1.5, T = 50 C, θ H = 1 C/W, θ CH = 2 C/W, and θ JC = 3C /W, whr: T = ambint tmpratur, θ H = hatsink to ambint thrmal rsistanc θ CH = cas to hatsink thrmal rsistanc θ JC = junction to cas thrmal rsistanc Th powr calculatd undr ths conditions is: P D = (V IN V OUT ) * I OUT = 7.5W. nd th junction tmpratur is calculatd as T J = T + P D * (θ H + θ CH + θ JC ) or T J = * (1+2+3) = 95 C rspons is ndd. If th powr sourc has a high C impdanc, a 0.1µF cramic capacitor btwn input & ground is rcommndd. Minimum oad Currnt To nsur a propr bhavior of th rgulator undr light load, a minimum load of 5m for SPX29302 is rquird. djustabl Rgulator Dsign Th SPX29302 ar adjustabl rgulators that can b programmd to any valu btwn 1.25V and 16V using 2 rsistors, R1 and R2. Th rlationship btwn th rsistors is: R1 = R2(V OUT /1.2401). nabl Input Th SPX29302 has an nabl function that switchs th rgulator on and off. Its thrsholds is TT compatibl. Whn th rgulator is activ, approximatly 20 u flows through th nabl pin. Typical pplication Circuits Figur 1 rprsnts an adjustabl output linar rgulator. Th valus of R1 and R2 st th output voltag valu as follows: V OUT =V RF * [1 + (R1/R2)]. For bst rsults, th total sris rsistanc should b small nough to pass a minimum rgulator load currnt of 5 m. minimum valu of 10kohms is rcommndd for R2 with a rang btwn 10kohms and 47 kohms. Rliabl opration is insurd blow 125 C. Capacitor Rquirmnts Th output capacitor is ndd to insur stability and minimiz th output nois. Th valu of th capacitor varis with th load. Howvr, a minimum valu of 10µF aluminum capacitor will guarant stability ovr all load conditions. tantalum capacitor is rcommndd if a fastr load transint 4
5 PCKG: 5 PIN TO263 (DTUM ) STING PN C2 H c 2 () 1 D1 5X b 4X 1 5 PIN TO263 JDC TO263 (BB) Variation 1 b Dimnsions in (mm) MIN NOM MX c c D BSC H BSC 0º8º 3 (b) WITH PTING c BS MT CONTCT R 5 PIN TO263 5
6 PCKG: 5 PIN TO220 /2 B H1 Q øp F STING PN D D1 1 D CHMFR OPTION C C D D 1 b C1 J1 5 PIN TO220 b C1 D 1 Dimnsions in (inchs) MIN NOM MX F H1 J P Q U V PIN TO220 6
7 PCKG: PINOUTS TO2635 Packag (T5) Top Viw SPX ) NB 2) INPUT 3) GND 4) OUTPUT 5) DJUST TO2205 Packag (U5) Top Viw SPX ) NB 2) INPUT 3) GND 4) OUTPUT 5) DJUST *Tab is intrnally connctd to GND ORDRING INFORMTION PRT NUMBR CCURCY TOP MRK OUTPUT VOTG PCKG SPX29302T5 1.0% 29302T5YYWW dj 5 lad TO263 SPX29302T5/TR 1.0% 29302T5YYWW dj 5 lad TO263 SPX29302U5 1.0% 29302U5YYWW dj 5 lad TO220 vailabl in lad fr packaging. To ordr add suffix to part numbr. xampl: SPX29302/TR = standard; SP6685R/TR = lad fr /TR = Tap and Rl Pack quantity is 500 for TO263. Corporation NOG XCNC Sipx Corporation Hadquartrs and Sals Offic 233 South Hillviw Driv Milpitas, C T: (408) FX: (408) Sipx Corporation rsrvs th right to mak changs to any products dscribd hrin. Sipx dos not assum any liability arising out of th application or us of any product or circuit dscribd hrin; nithr dos it convy any licns undr its patnt rights nor th rights of othrs. 7
3A High Current, Low Dropout Voltage Regulator
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