400mA Low Drop Out Voltag Rgulator with Shutdown FEATURES Output 3.3V, 5.0V, at 400mA Output Vry Low Quiscnt Currnt Low Dropout Voltag Extrmly Tight Load and Lin Rgulation Vry Low Tmpratur Cofficint Currnt & Thrmal Limiting Error Flag Warns of Output Dropout (for SO-8) Logic-Controlld Elctronic Shutdown (for SO-8) Output Programmabl from 1.24V to 20V (for SO-8) Equivalnt Rplacmnt for MIC2920A and MIC2904 SHUTDOWN INPUT Th is a low powr voltag rgulator. This dvic is an xcllnt choic for us in battrypowrd applications such as cordlss tlphons, radio control systms, and portabl computrs. Th faturs vry low quiscnt currnt (140µA Typical) and vry low dropout voltag. This includs a tight initial tolranc of 1% maximum and vry low output tmpratur cofficint, making th usful as a low-powr voltag rfrnc. Th rror flag output fatur is usd as powr-on rst for warning of a low output voltag, du to a falling voltag input from battris. Anothr fatur is th logic-compatibl shutdown input which nabls th rgulator to b switchd on and off. Th is offrd in 3-pin TO-220 packag, surfac mount SO-8 (sam pin out as SPX2951), SOT-223, and 3-pin TO-263 packags. Th rgulator output voltag (of th SO-8) may b pin-strappd for a 3.3V and 5.0V or programmd from 1.24V to 20V with an xtrnal pair of rsistors. ON V IN 100K OFF SD 3 Adjustabl Rgulator V IN 0.1 µf 8 1 V IN V OUT 4 FB ERROR 7 5 R 1 R 2 V REF 0.01µF 1.2V to 20V 10µF ERROR OUTPUT I G 5V Rgulator Circuit IN OUT 2.2 µf Now Availabl in Lad Fr Packaging DESCRIPTION 5V TO-220-3 (U) TO-263-3 (T) V OUT 8-Pin Surfac Mount 1 8 V IN SOT-223 (M3) 1 2 3 1 2 3 SENSE SHUTDOWN 2 7 3 6 4 5 FEEDBACK 5V/ 3.3V TAP ERROR 1 2 3 V IN V OUT V IN V OUT V IN V OUT Top Viw Exar/ Top Viw Front Viw Top Viw 1 Dat: 03/02/06 400mA Low Drop Out Voltag Rgulator with Shutdown Copyright 2006 Sipx Corporation
Powr Dissipation... Intrnally Limitd Lad Tmp. (Soldring, 5 Sconds)... 260 C Storag Tmpratur Rang...-65 C to 150 C Oprating Junction Tmpratur Rang...-40 C to 125 C Input Supply Voltag... -20V to 20V ABSOLUTE MAXIMUM RATINGS Fdback Input Voltag... -1.5V to 20V Shutdown Input Voltag... -0.3V to 20V Error Comparator Output... -0.3V to 20V ESD Rating... 2kV ELECTRICAL CHARACTERISTICS Elctrical charactristics at V IN =V O 1V, I O = 1mA, C OUT = 2.2µF, T A = 25 C, unlss othrwis spcifid. Boldfac applis ovr th full oprating tmpratur rang. PARAMETER CONDITIONS TYP MIN MAX UNITS (Not 2) 3.3V Vrsion Output Voltag 3.3 3.267 3.333 V 1mA I L 400mA 3.3 3.217 3.382 5.0V Vrsion Output Voltag 5.0 4.950 5.050 V 1mA I L 400mA 5.0 4.880 5.120 All Voltag Options Output Voltag 20 100 ppm/ C Tmpratur Cofficint (Not1) Lin Rgulation (Not 4) 6V V IN 20V 1.5 20 mv Load Rgulation (Not 3) I L =1 to 400mA 5 20 mv 30 Dropout Voltag (Not5) I L =1mA 60 100 mv 150 I L =400mA 370 400 500 Ground Currnt I L =1mA 140 200 µa 300 I L =100mA 1.3 2 ma 2.5 I L =250mA 3.4 9 ma 12 I L =400mA 6 15 ma 25 Currnt Limit V OUT =0 800 ma Thrmal Rgulation 0.05 0.2 %/W Output Nois, 10Hz to 100kHz C L =10µF 400 µv Vrms I L =100mA C L =100µF 260 Adjustabl 8-Pin Vrsion only Rfrnc Voltag 1.235 1.210 1.260 V Rfrnc Voltag Ovr Tmpratur 1.185 1.285 V Fdback Pin Bias Currnt 20 40 na 60 Rfrnc Voltag Tmpratur 20 ppm/ C Cofficint Exar/ 2 Dat: 03/02/06 400mA Low Drop Out Voltag Rgulator with Shutdown Copyright 2006 Sipx Corporation
ELECTRICAL CHARACTERISTICS Elctrical charactristics at V IN = V O 1V, I O = 1mA, C OUT = 2.2µF, T A = 25 C, unlss othrwis spcifid. Boldfac applis ovr th full oprating tmpratur rang. PARAMETER CONDITIONS TYP MIN MAX UNITS (Not 2) Fdback Pin Bias Currnt 0.1 na/ C Tmpratur Cofficint Error Comparator Output Lakag Currnt V 0UT =20V 0.01 1 µa 2 Output Low Voltag V IN =4.5V 150 250 mv I OUT =400µA 400 Uppr Thrshold Voltag (Not 6) 60 40 mv 25 Lowr Thrshold Voltag (Not 6) 75 95 mv 140 Hystrsis (Not 6) 15 mv Shutdown Input Input Logic Voltag 1.3 Low (Rgulator ON) 0.7 V High (Rgulator OFF) 2.0 Shutdown Pin Input Currnt V S =2.4V 30 50 µa 100 V S =20V 450 600 750 Rgulator Output Currnt (Not 7) 3 10 µa in Shutdown 20 Thrmal Rsistanc Thta JA TO-220-3 29.4 TO-263-3 31.4 ºC/W NSOIC-8 128.4 SOT-223 62.3 Not 1: Output or rfrnc voltag tmpratur cofficints dfind as th worst cas voltag chang dividd by th total tmpratur rang. Not 2: Additional conditions for th 8-pin vrsions ar fdback tid to 5V/3.3V tap and output tid to output sns (V OUT = 5V) and V SHUTDOWN 0.8V. Not 3: Rgulation is masurd at constant junction tmpratur, using puls tsting with a low duty cycl. Changs in output voltag du to hating ffcts ar covrd undr th spcification for thrmal rgulation. Not 4: Lin rgulation for th is tstd at 150 C for I L = 1 ma. For T J = 125 C, lin rgulation is guarantd by dsign. Not 5: Dropout voltag is dfind as th input to output diffrntial at which th output voltag drops 100 mv blow its nominal valu masurd at 1V diffrntial at vry low valus of programmd output voltag, th minimum input supply voltag of 2V ( 2.3V ovr tmpratur) must b takn into account. Not 6: Comparator thrsholds ar xprssd in trms of a voltag diffrntial at th fdback trminal blow th nominal rfrnc voltag masurd at 6V input. To xprss ths thrsholds in trms of output voltag chang, multiply by th rror amplifir gain = V OUT /V REF = (R1 R2)/R2. For xampl, at a programmd output voltag of 5V, th Error output is guarantd to go low whn th output drops by 95 mv x 5V/1.235 = 384 mv. Thrsholds rmain constant as a prcnt of V OUT as V OUT is varid, with th dropout warning occurring at typically 5% blow nominal, 7.5% guarantd. Exar/ Not 7: V SHUTDOWN 2V, V IN 20V, V OUT = 0, Fdback pin tid to 5V/3.3V Tap. Dat: 03/02/06 400mA Low Drop Out Voltag Rgulator with Shutdown Copyright 2006 Sipx Corporation 3
BLOCK DIAGRAM UNREGULATED DC 7 8 1 5V @ 400mA MAX 2 FROM TTL 3 _ ERROR AMPLIFIER 180kΩ.. 6 330kΩ.. 60 mv _ 1.23V REFERENCE 60kΩ.. ERROR DETECTION COMPARATOR 5 4 1 uf TO CMOS OR TTL -5.0 Block Diagram Extrnal Capacitors Th stability of th rquirs a 2.2µF or gratr capacitor btwn output and ground. Oscillation could occur without this capacitor. Most typs of tantalum or aluminum lctrolytic capacitors work fin hr. For oprations of blow -25 C, solid tantalum is rcommndd sinc many of th aluminum typs hav lctrolyts that frz at about -30 C. Th ESR of about 5Ω or lss and rsonant frquncy abov 500kHz ar th most important paramtrs in th valu of th capacitor. Th capacitor valu can b incrasd without limit. APPLICATION HINTS 1.23V output. Th, unlik othr low dropout rgulators, will rmain stabl and in rgulation with no load in addition to th intrnal voltag dividr. This fatur is spcially important in applications lik CMOS RAM kp-aliv. If thr is mor than 10 inchs of wir btwn th input and th AC filtr capacitor, or if a battry is usd as th input, thn a 0.1µF tantalum or aluminum lctrolytic capacitor should b placd from th input to th ground. At lowr valus of output currnt, lss output capacitanc is rquird for stability. For th Instability can occur if thr is stray capacitanc currnts blow 10mA th valu of th capacitor to th fdback trminal (pin can b rducd to 0.5µF and 0.15µF for 7). This could caus mor problms whn 1mA. Mor output capacitanc is ndd using a highr valu of xtrnal rsistors to for th 8-pin vrsion at voltags blow 5V st th output voltag. sinc it runs th rror amplifir at lowr gain. At worst cas, 4.7µF or gratr must This problm can b fixd by adding a 100pF b usd for th condition of 250mA load at capacitor btwn output and fdback and incrasing th output capacitor to at Exar/ last 3.3µF. Dat: 03/02/06 400mA Low Drop Out Voltag Rgulator with Shutdown Copyright 2006 Sipx Corporation 4
Error Dtction Comparator Output Th Comparator producs a logic low output whnvr th output falls out of rgulation by mor than about 5%. This is around 60mV offst dividd by th 1.235 rfrnc voltag. This trip lvl rmains 5% blow normal rgardlss of th programmd output voltag of th rgulator. Figur 1 shows th timing diagram dpicting th ER- ROR signal and th rgulator output voltag as th input is rampd up and down. Th ERROR signal bcoms low at around 1.3V input, and gos high around 5V input (input voltag at which V OUT = 4.75V). Sinc th s dropout voltag is load dpndnt, th input voltag trip point (around 5V) will vary with th load currnt. Th output voltag trip point (approximatly 4.75V) dos not vary with load. Th rror comparator has an opn-collctor output, which rquirs an xtrnal pull-up rsistor. Dpnding on th systm rquirmnts th rsistor may b rturnd to 5V output or othr supply voltag. In dtrmining th valu of this rsistor, not that th output is ratd to sink 400µA; this valu adds to battry drain in a low battry condition. Suggstd valus rang from 100K to 1MΩ. If th output is unusd this rsistor is not rquird. Programming th Output Voltag of Th may b pin-strappd for 5V or 3.3V using its intrnal voltag dividr by tying Pin 1 (output) to Pin 2 (sns) and Pin 7 (fdback) to Pin 6 (5V/3.3V Tap). Also, it may b programmd for any output voltag btwn its 1.235V rfrnc and its 20V maximum rating. As sn on th front pag, an xtrnal pair of rsistors is rquird. rcommndd load currnt of 1µA forcs an uppr limit of 1.2MΩ on th valu of R 2. If no load is prsntd, th I FB producs an rror of typically 2% in V OUT, which may b liminatd at room tmpratur by trimming R 1. To improv th accuracy choos th valu of R 2 = 100kΩ; this rducs th rror by 0.17% and incrass th rsistor program currnt by 12µA. Sinc th typically draws 60µA at no load with Pin 2 opn-circuitd, this is a small pric to pay. Rducing Output Nois It may b an advantag to rduc th AC nois prsnt at th output. On way is to rduc th rgulator bandwidth by incrasing th siz of th output capacitor. This is th only way that nois can b rducd on th 3 lad but it is rlativly infficint; as incrasing th capacitor from 1µF to 220µF only dcrass th nois from 430µV to 160µV Vrms for a 100kHz bandwidth at 5V output. Nois could also b rducd fourfold by a bypass capacitor across R 1, sinc it rducs th high frquncy gain from 4 to unity. Pick C BYPASS 1 / 2πR 1 x 200 Hz or choos 0.01µF. Whn doing this, th output capacitor must b incrasd to 3.3µF to maintain stability. Ths changs rduc th output nois from 430µV to 100µV Vrms for a 100kHz bandwidth at 5V output. With th bypass capacitor addd, nois no longr scals with output voltag so that improvmnts ar mor dramatic at highr output OUTPUT VOLTAGE ERROR* 4.75V Rfr to th quation blow for th programming of th output voltag: V OUT = V REF x ( 1 R 1 / R 2 ) I FB R 1 INPUT VOLTAGE 1.3V 5.0V * S Application Info. Th Exar/ V REF is 1.235 and I FB is th fdback bias currnt, nominally -20nA. Th minimum Figur 1. ERROR Output Timing 5 Dat: 03/02/06 400mA Low Drop Out Voltag Rgulator with Shutdown Copyright 2006 Sipx Corporation
PACKAGE: 3 PIN TO-220 E2 E Thrmal Pad Q øp (H1) D D2 D1 1 FRONT VIEW L L1 BACK VIEW b2 1 b E1 H1 C A A1 Sating Plan SIDE VIEW Chamfr Optional SYMBOL 3 Pin TO-220 JEDEC TO-220 Variation AB Dimnsions in Inchs: Controlling Dimnsion Dimnsions in Millimtrs: Convrsion Factor: 1 Inch = 25.40 mm MIN NOM MAX MIN NOM MAX A 0.140-0.190 3.56-4.83 A1 0.020-0.055 0.51-1.27 A2 0.080-0.115 2.03-2.79 b 0.015 0.027 0.040 0.25 0.51 1.02 b2 0.045 0.057 0.070 1.14 1.45 1.78 c 0.014-0.024 0.25-0.51 D 0.560-0.650 14.22-16.51 D1 0.330-0.355 8.38-8.89 D2 0.480-0.507 12.19-12.70 E 0.380-0.420 9.65-10.67 E1 0.270-0.350 6.86-8.89 E2 - - 0.030 - - 0.76 1.100 BSC.200 BSC 2.54 BSC 5.08 BSC H1 0.230-0.270 5.84-6.86 L 0.500-0.580 12.70-14.73 L1 - - 0.250 - - 6.35 ΦP 0.139-0.161 3.30-4.06 A2 Exar/ 6 Q 0.100-0.135 2.54-3.30 SIPEX Pkg Signoff Dat/Rv: JL Aug4-05 / Rv A Dat: 03/02/06 400mA Low Drop Out Voltag Rgulator with Shutdown Copyright 2006 Sipx Corporation
PACKAGE: 3 PIN TO-263 E E/2 A Sating Plan L1 C2 D Chamfr Optional SIDE VIEW H 1 2 3 c S Dtail C b2 b Gaug Plan Sating FRONT VIEW Plan θ L3 A1 L DETAIL C Thrmal Pad (L1) D1 SYMBOL 3 Pin TO-263 JEDEC TO-263 Variation AA Inchs Controlling Dimnsion Millimtrs Convrsion Factor: 1 Inch = 25.40 mm MIN NOM MAX MIN NOM MAX A 0.160-0.190 4.06-4.83 A1 0.000-0.010 0.00-0.25 b 0.020-0.039 0.51-0.99 b2 0.045-0.070 1.14-1.78 c 0.015-0.029 0.38-0.74 c2 0.045-0.065 1.14-1.65 D 0.330-0.380 8.38-9.65 D1 0.270 - - 6.86 - - E 0.380-0.420 9.65-10.67 E1 0.245 - - 6.22 - - H 0.575.100 BSC - 0.625 14.61 2.54 BSC - 15.88 L 0.070-0.110 1.78-2.79 L1 - - 0.066 - - 1.68 BACK VIEW L3.010 BSC 0.25 BSC Exar/ E1 SIPEX Pkg Signoff Dat/Rv: 7 O 0-8 0-8 JL Aug5-05 / Rv A Dat: 03/02/06 400mA Low Drop Out Voltag Rgulator with Shutdown Copyright 2006 Sipx Corporation
PACKAGE: 3 PIN SOT-223 D b2 E1 E 1 2 3 TOP VIEW 1 b Gaug Plan A2 A L2 c ø L Sating Plan A1 FRONT VIEW SYMBOL MIN NOM MAX MIN NOM MAX A - - 1.80 - - 0.071 A1 0.02-0.10 0.001-0.004 A2 1.50 1.60 1.70 0.060 0.063 0.067 b 0.66 0.76 0.84 0.026 0.030 0.033 b2 2.90 3.00 3.10 0.114 0.118 0.122 c 0.23 0.30 0.35 0.010 0.012 0.014 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 E1 3.30 3.50 3.70 0.130 0.138 0.146 1 L 0.75 2.30 BASIC 4.60 BASIC - - 0.030 0.091 BASIC 0.182 BASIC - - L2 3 Pin SOT-223 JEDEC TO-261 Variation AA Millimtrs Controlling Dimnsion 0.25 BASIC Inchs Convrsion Factor: 1 Inch = 25.40 mm 0.010 BASIC Exar/ ø 0º - 10º 0º - 10º SIPEX Pkg Signoff Dat/Rv: JL Aug8-05/Rv A 8 Dat: 03/02/06 400mA Low Drop Out Voltag Rgulator with Shutdown Copyright 2006 Sipx Corporation
PACKAGE: 8 PIN NSOIC D/2 D SIDE VIEW E1 E1/2 8 7 6 5 E/2 E A A1 A2 Sating Plan Pin1 Dsignator to b within this INDEX AREA (D/2 x E1/2) 1 TOP VIEW 2 3 b 4 (L1) h ø1 FRONT VIEW ø2 h R1 Gaug Plan R L2 ø1 c ø Sating L Plan SYMBOL 8 Pin NSOIC JEDEC MS-012 Variation AA Dimnsions in Millimtrs: Controlling Dimnsion Dimnsions in Inchs Convrsion Factor: 1 Inch = 25.40 mm MIN NOM MAX MIN NOM MAX A 1.35-1.75 0.053-0.069 A1 0.10-0.25 0.004-0.010 A2 1.25-1.65 0.049-0.065 b 0.31-0.51 0.012-0.020 c 0.17-0.25 0.007-0.010 E E1 h 0.25 6.00 BSC 3.90 BSC 1.27 BSC 0.50 0.010 0.236 BSC 0.154 BSC 0.050 BSC - 0.020 L 0.40-1.27 0.016-0.050 L1 L2 R 0.07 1.04 REF 0.25 BSC - - 0.003 0.041 REF 0.010 BSC - - R1 0.07 - - 0.003 - - ø 0º - 8º 0º - 8º ø1 5º - 15º 5º - 15º ø2 0º - - 0º - - D 4.90 BSC 0.193 BSC Exar/ SIPEX Pkg Signoff Dat/Rv: JL Aug16-05 / Rv A 9 Dat: 03/02/06 400mA Low Drop Out Voltag Rgulator with Shutdown Copyright 2006 Sipx Corporation
ORDERING INFORMATION Ordring No. Accuracy Output Voltag Packags M3-3-3 1% 3.3V 3-Pin SOT-223 M3-3-3/TR 1% 3.3V 3-Pin SOT-223 M3-5-0 1% 5.0V 3-Pin SOT-223 M3-5-0/TR 1% 5.0V 3-Pin SOT-223 S-3-3 1% 3.3V 8-Pin NSOIC S-3-3/TR 1% 3.3V 8-Pin NSOIC S-5-0 1% 5.0V 8-Pin NSOIC S-5-0/TR 1% 5.0V 8-Pin NSOIC T-3-3 1% 3.3V 3-Pin TO-263 T-3-3/TR 1% 3.3V 3-Pin TO-263 T-5-0 1% 5.0V 3-Pin TO-263 T-5-0/TR 1% 5.0V 3-Pin TO-263 U-3-3 1% 3.3V 3-Pin TO-220 U-5-0 1% 5.0V 3-Pin TO-220 Availabl in lad fr packaging. To ordr add "-L" suffix to part numbr. Exampl: T-3-3/TR = standard; T-L-3-3/TR = lad fr /TR = Tap and Rl Pack quantity is 500 for TO-263 and 2,500 for SOT-223 and NSOIC. Solvd by SipxTM Sipx Corporation 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. Exar/ 10 Dat: 03/02/06 400mA Low Drop Out Voltag Rgulator with Shutdown Copyright 2006 Sipx Corporation