A Low Dropout Voltag Rgulator Fixd Output, Fast Rspons SPX3940 FEATURES % Output Accuracy SPX3940A Guarantd.5A Pak Currnt Low Quiscnt Currnt Low Dropout Voltag of 280mV at A Extrmly Tight Load and Lin Rgulation Extrmly Fast Transint Rspons Rvrs-battry Protction Intrnal Thrmal Protction Intrnal Short Circuit Currnt Limit Rplacmnt for LM3940 Standard SOT-223, TO-220 and TO-263 packags Now Availabl in Lad Fr Packaging 2 3 SPX3940 3 Pin TO-263 GND APPLICATIONS VGA & Sound Card Automotiv Elctronics LCD Monitors Cordlss Tlphons Powr PC TM Supplis SMPS Post-Rgulator Laptop, Palmtop, and Notbook Computr High Efficincy Linar Powr Supplis Constant Currnt Rgulators Portabl Instrumntation DESCRIPTION Th SPX3940 is a A, accurat voltag rgulators with a low drop out voltag of 280mV(typical) at A. Ths rgulators ar spcifically dsignd for low voltag applications that rquir a low dropout voltag and a fast transint rspons. Thy ar fully fault protctd against ovr-currnt, rvrs battry, and positiv and ngativ voltag transints. Th SPX3940 is offrd in 3-pin SOT-223, TO-220 & TO-263 packags. For a 3A vrsion, rfr to th SPX29300 data sht. TYPICAL APPLICATIONS CIRCUIT + 6.8µF 2 + 0µF SPX3940 3 Figur. Fixd Output Linar Rgulator.
ABSOLUTE MAXIMUM RATINGS Lad Tmpratur (soldring, 5 sconds)... 260 C Storag Tmpratur Rang... -65 C to +50 C Oprating Junction Tmpratur Rang... -40 C to +25 C Input Voltag (Not 5)... 6V At = + V and I OUT = 0 ma, C IN = 6.8 µf, C OUT = 0µF; T A = 25 C, unlss othrwis spcifid. Th Boldfac applis ovr th junction tmpratur rang. Adjustabl vrsions ar st at 5.0V. PARAMETER CONDITIONS TYP MIN MAX MIN MAX UNITS SPX3940A (%) SP3940 (2%).8V Vrsion Output Voltag I OUT = 0mA.8.782.88.764.836 V 0mA I OUT A, 6V 6V.8.755.845.737.863 2.5V Vrsion Output Voltag I OUT = 0mA 2.5 2.475 2.525 2.450 2.550 V 0mA I OUT A, 6V 6V 2.5 2.437 2.563 2.42 2.588 3.3V Vrsion Output Voltag I OUT = 0mA 3.3 3.267 3.333 3.234 3.366 V 0mA I OUT A, 6V 6V 3.3 3.27 3.383 3.84 3.46 5.0V Vrsion Output Voltag I OUT = 0mA 5.0 4.950 5.050 4.900 5. V 0mA I OUT A, 6V 6V 5.0 4.875 5.25 4.825 5.75 All Voltag Options ELECTRICAL CHARACTERISTICS Lin Rgulation I O =0mA, ( +V) 6V 0.2.0.0 % Load Rgulation = +V, 0mA I OUT A 0.3.5.5 % V Output Voltag 20 ppm/ C T Tmpratur Cof. Dropout Voltag (Not ) I O =ma 70 200 200 mv (xcpt.8v vrsion) I O =A 280 550 550 Ground Currnt (Not 3) I O =750mA, =, + V 2 25 25 ma I O =A 8 I GNDDO Ground Pin =0.V lss than spcifid.2 ma Currnt at Dropout I OUT = 0mA Currnt Limit =0V (Not 2) 2.2.5.5 A Output Nois Voltag C L = 0µF 400 µv RMS (0Hz to khz) I L =ma C L =33µF 260 Thrmal Rsistanc TO-220 Junction to Cas, at Tab 3 C/W TO-220 Junction to Ambint 29.4 TO-263 Junction to Cas, at Tab 3 C/W TO-263 Junction to Ambint 3.4 SOT-223 Junction to Cas, at Tab 5 C/W SOT-223 Junction to Ambint 62.3 NOTES: Not : Dropout voltag is dfind as th input to output diffrntial whn th output voltag drops to 99% of its normal valu. Not 2: = (NOMINAL) + V. For xampl, us =4.3V for a 3.3V rgulator. Employ puls-tsting procdurs to minimiz tmpratur ris. Not 3: 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 4: Thrmal rgulation is dfind as th chang in th output voltag at a tim T aftr a chang in powr dissipation is applid, xcluding load or lin rgulation ffcts. Not 5: Maximum positiv supply voltag of 20V must b of limitd duration (<ms) and duty cycl (<%). Th maximum continuous supply voltag is 6V. 2
I GND (ma) I GND (µa) BLOCK DIAGRAM IN OUT.240V Rfrnc + O.V I LIMIT 28V R - Ibias Thrmal Shutdown R2 GND TYPICAL PERFORMANCE CHARACTERISTICS 3.30 3.320 3.35 3.305 (V) 3.30 3.305 3.300 3.295 3.290 IL = 0mA 3.285 3.280 4 6 8 0 2 4 6 (V) (V) 3.300 3.295 3.290 3.285 3.280 IL=4.3mA CL=0µF 0 0.25 0.5 0.75.25.5 IL (A) Figur 2. Lin Rgulation Figur 3. Load Rgulation 80.0 70.0 60.0 50.0 95 90 40.0 85 30.0 20.0 0.0 = 4.3V 80 75 IL = 0 ma 0.0 0 0.25 0.5 0.75.25.5 IL (A) 70-40 -20 0 20 40 60 80 20 (V) Figur 4. Ground Currnt vs Load Currnt Figur 5. Ground Currnt vs Input Voltag 3
TYPICAL PERFORMANCE CHARACTERISTICS I GND (ma) 90 80 70 60 50 40 30 3.3 Dvic V 20 IN = 3.2V 0 0 0 0.25 0.5 0.75.25.5 IL(A) V Dropout (mv) 600 500 400 300 200 0 0 0.25 0.5 0.75.25.5 IL (A) Figur 6. Ground Currnt vs Load Currnt in Dropout Figur 7. Dropout Voltag vs Load Currnt I GND (µa) 280 270 260 250 240 230 220 20 200 90 80-40 -20 0 20 40 60 80 20 = 4.3V IL = 0mA (V) 3.320 3.30 3.300 3.290 3.280 3.270 3.260 3.250 3.240 3.230 = 4.3V IL = 0mA 3.220-40 -20 0 20 40 60 80 20 Figur 8. Ground Currnt vs Tmpratur at I LOAD = 0mA Figur 9. Output Voltag vs Tmpratur at I LOAD =0mA I GND (ma) 7.00 6.80 6.60 6.40 6.20 6.00 5.80 5.60 5.40 5.20 = 4.3V IL = 500mA I GND (ma) 30 29 28 27 26 25 24 23 22 2 = 3.2V IL = 750mA 5.00-40 -20 0 20 40 60 80 20 20-40 -20 0 20 40 60 80 20 Figur 0. Ground Currnt vs Tmpratur at I LOAD =500mA Figur. Ground Currnt vs Tmpratur in Dropout at I LOAD =750mA 4
I GND (ma) I GND ma) TYPICAL PERFORMANCE CHARACTERISTICS 52.0 50.0 48.0 46.0 95 90 44.0 85 42.0 40.0 38.0 = 4.3V IL=.5A 80 75 = 3.2V IL =.5A 36.0-40 -20 0 20 40 60 80 20 70-40 -20 0 20 40 60 80 20 Figur 2. Ground Currnt vs Tmpratur at I LOAD =.5A Figur 3. Ground Currnt vs Tmpratur in Dropout at I LOAD =.5A V DROPOUT (mv) 350 330 30 290 270 250 230 20 90 70 50-40 -20 0 20 40 60 80 IL = 750mA 20 V DROPOUT (mv) 500 480 460 440 420 400 380 360 340 320-40 -20 0 20 40 60 80 IL =.5A 20 Figur 4. Dropout Voltag vs Tmpratur at I LOAD = 750mA Figur 5. Dropout Voltag vs Tmpratur at I LOAD =.5mA I EN (µa) 35 30 25 20 5 0 5 0-40 -20 0 20 40 60 80 VIN = 3.2V IL = 750mA 20 V TH (V) 2.00.90.80.70.60.50.40.30.20.0.00-40 -20 0 20 40 60 80 VIN = 3.2V IL = 750mA 20 Figur 6. Enabl Currnt vs Tmpratur for V EN = 6V Figur 7. Enabl Thrshold vs Tmpratur 5
APPLICATION INFORMATION Th SPX3940 incorporats protction against ovr-currnt faults, rvrsd load insrtion, ovr tmpratur opration, and positiv and ngativ transint voltag. Thrmal Considrations Although th SPX3940 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 junction-to-cas path. In ordr to insur th bst thrmal flow of th componnt, propr mounting is rquird. Consult hatsink manufacturr for thrmal rsistanc and dsign of hatsink. For xampl, TO-220 dsign: Assum that = 0V, = 5V, I OUT =.5A, T A = 50 C/W, θ HA = C/W, θ CH = 2 C/W, and θ JC = 3 C/W. Whr TA = ambint tmpratur θ HA = 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 = ( - ) * I OUT = 7.5W. And th junction tmpratur is calculatd as T J = T A + P D * (θ HA + θ CH + θ JC ) or T J = 50 + 7.5 * ( + 2 + 3) = 95 C Rliabl opration is insurd. + 6.8µF 2 + 0µF SPX3940 3 Figur 8. Fixd Output Linar Rgulator. 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 0µF aluminum capacitor will guarant stability ovr all load conditions. A tantalum capacitor is rcommndd if a fastr load transint rspons is ndd. If th powr sourc has a high AC impdanc, a 0.µF cramic capacitor btwn input & ground is rcommndd. Minimum Load Currnt To nsur a propr bhavior of th rgulator undr light load, a minimum load of 5mA for SPX3940 is rquird. 6
PACKAGE: TO-263 E E/2 A Sating Plan L C2 D Chamfr Optional SIDE VIEW H 2 3 c S Dtail C b2 FRONT VIEW b Gaug Plan Sating Plan θ L3 L DETAIL C A Thrmal Pad E (L) D BACK VIEW SYMBOL 3 Pin TO-263 JEDEC TO-263 Variation AA Inchs Controlling Dimnsion Millimtrs Convrsion Factor: Inch = 25.40 mm MIN NOM MAX MIN NOM MAX A 0.60-0.90 4.06-4.83 A 0.000-0.00 0.00-0.25 b 0.020-0.039 0.5-0.99 b2 0.045-0.070.4 -.78 c 0.05-0.029 0.38-0.74 c2 0.045-0.065.4 -.65 D 0.330-0.380 8.38-9.65 D 0.270 - - 6.86 - - E 0.380-0.420 9.65-0.67 E 0.245 - - 6.22 - - H 0.575. BSC - 0.625 4.6 2.54 BSC - 5.88 L 0.070-0.0.78-2.79 L - - 0.066 - -.68 L3 O 0.00 BSC - 8 0 0.25 BSC - 8 SIPEX Pkg Signoff Dat/Rv: JL Aug5-05 / Rv A 7
PACKAGE: 3 PIN TO-220 E2 E Thrmal Pad Q øp (H) D D2 D FRONT VIEW L L BACK VIEW b2 b E A Sating Plan 3 Pin TO-220 JEDEC TO-220 Variation AB H C A2 A SIDE VIEW Chamfr Optional SYMBOL Dimnsions in Inchs: Controlling Dimnsion Dimnsions in Millimtrs: Convrsion Factor: Inch = 25.40 mm MIN NOM MAX MIN NOM MAX A 0.40-0.90 3.56-4.83 A 0.020-0.055 0.5 -.27 A2 0.080-0.5 2.03-2.79 b 0.05 0.027 0.040 0.25 0.5.02 b2 0.045 0.057 0.070.4.45.78 c 0.04-0.024 0.25-0.5 D 0.560-0.650 4.22-6.5 D 0.330-0.355 8.38-8.89 D2 0.480-0.507 2.9-2.70 E 0.380-0.420 9.65-0.67 E 0.270-0.350 6.86-8.89 E2 - - 0.030 - - 0.76 H 0.230. BSC.200 BSC - 0.270 5.84 2.54 BSC 5.08 BSC - 6.86 L 0.500-0.580 2.70-4.73 L - - 0.250 - - 6.35 ΦP 0.39-0.6 3.30-4.06 Q 0. - 0.35 2.54-3.30 SIPEX Pkg Signoff Dat/Rv: JL Aug4-05 / Rv A 8
PACKAGE: 3 PIN SOT223 D b2 E E 2 3 TOP VIEW b A Gaug Plan A2 ø L2 L Sating Plan A c FRONT VIEW 3 Pin SOT-223 JEDEC TO-26 Variation AA Millimtrs Controlling Dimnsion Inchs Convrsion Factor: Inch = 25.40 mm SYMBOL MIN NOM MAX MIN NOM MAX A - -.80 - - 0.07 A 0.02-0.0 0.00-0.004 A2.50.60.70 0.060 0.063 0.067 b 0.66 0.76 0.84 0.026 0.030 0.033 b2 2.90 3.00 3.0 0.4 0.8 0.22 c 0.23 0.30 0.35 0.00 0.02 0.04 D 6.30 6.50 6.70 0.248 0.256 0.264 E 6.70 7.00 7.30 0.264 0.276 0.287 E 3.30 3.50 3.70 0.30 0.38 0.46 L 0.75 2.30 BASIC 4.60 BASIC - - 0.030 0.09 BASIC 0.82 BASIC - - L2 ø 0º 0.25 BASIC - 0º 0º 0.00 BASIC - 0º SIPEX Pkg Signoff Dat/Rv: JL Aug8-05/Rv A 9
PINOUTS TO-263-3 Packag (T) TO-220-3 Packag (U) SOT-223 (M3) 2 3 2 3 2 3 GND GND GND Front Viw TAB=GND Front Viw TAB=GND Top Viw TAB=GND ORDERING INFORMATION PART NUMBER ACC. OUTPUT VOLTAGE PACKAGE SPX3940AU--8 %.8V 3 lad TO-220 SPX3940AU-2-5 % 2.5V 3 lad TO-220 SPX3940AU-3-3 % 3.3V 3 lad TO-220 SPX3940AU-5-0 % 5.0V 3 lad TO-220 SPX3940AT--8 %.8V 3 lad TO-263 SPX3940AT--8/TR %.8V 3 lad TO-263 SPX3940AT-2-5 % 2.5V 3 lad TO-263 SPX3940AT-2-5/TR % 2.5V 3 lad TO-263 SPX3940AT-3-3 % 3.3V 3 lad TO-263 SPX3940AT-3-3/TR % 3.3V 3 lad TO-263 SPX3940AT-5-0 % 5.0V 3 lad TO-263 SPX3940AT-5-0/TR % 5.0V 3 lad TO-263 SPX3940U--8 2%.8V 3 lad TO-220 SPX3940U-2-5 2% 2.5V 3 lad TO-220 SPX3940U-3-3 2% 3.3V 3 lad TO-220 SPX3940U-5-0 2% 5.0V 3 lad TO-220 Availabl in lad fr packaging. To ordr add "-L" suffix to part numbr. Exampl: SPX3940AT-3-3/TR = standard; SPX3940AT-L-3-3/TR = lad fr /TR = Tap and Rl Pack quantity is 500 for TO-263 and 2,500 for SOT-223. Sipx Corporation Solvd By SipxTM Hadquartrs and Sals Offic 233 South Hillviw Driv Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 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. 0
ORDERING INFORMATION PART NUMBER ACC. OUTPUT VOLTAGE PACKAGE SPX3940T--8 2%.8V 3 lad TO-263 SPX3940T--8/TR 2%.8V 3 lad TO-263 SPX3940T-2-5 2% 2.5V 3 lad TO-263 SPX3940T-2-5/TR 2% 2.5V 3 lad TO-263 SPX3940T-3-3 2% 3.3V 3 lad TO-263 SPX3940T-3-3/TR 2% 3.3V 3 lad TO-263 SPX3940T-5-0 2% 5.0V 3 lad TO-263 SPX3940T-5-0/TR 2% 5.0V 3 lad TO-263 SPX3940AM3--8 %.8V 3 lad SOT-223 SPX3940AM3--8/TR %.8V 3 lad SOT-223 SPX3940AM3-2-5 % 2.5V 3 lad SOT-223 SPX3940AM3-2-5/TR % 2.5V 3 lad SOT-223 SPX3940AM3-3-3 % 3.3V 3 lad SOT-223 SPX3940AM3-3-3/TR % 3.3V 3 lad SOT-223 SPX3940AM3-5-0 % 5.0V 3 lad SOT-223 SPX3940AM3-5-0/TR % 5.0V 3 lad SOT-223 SPX3940M3--8 2%.8V 3 lad SOT-223 SPX3940M3--8/TR 2%.8V 3 lad SOT-223 SPX3940M3-2-5 2% 2.5V 3 lad SOT-223 SPX3940M3-2-5/TR 2% 2.5V 3 lad SOT-223 SPX3940M3-3-3 2% 3.3V 3 lad SOT-223 SPX3940M3-3-3/TR 2% 3.3V 3 lad SOT-223 SPX3940M3-5-0 2% 5.0V 3 lad SOT-223 SPX3940M3-5-0/TR 2% 5.0V 3 lad SOT-223 Availabl in lad fr packaging. To ordr add "-L" suffix to part numbr. Exampl: SPX3940AM3-3-3/TR = standard; SPX3940AM3-L-3-3/TR = lad fr /TR = Tap and Rl Pack quantity is 500 for TO-263 and 2,500 for SOT-223. Sipx Corporation Solvd By SipxTM Hadquartrs and Sals Offic 233 South Hillviw Driv Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 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.