Package: H: TO-252 P: TO-220 S: TO-263. Output Voltage : Blank = Adj 12 = 1.2V 15 = 1.5V 18 = 1.8V 25 = 2.5V 33 = 3.3V 50 = 5.0V 3.3V/3A.

Transcription

1 Faturs Advancd Powr 3-Trminal ustabl or Fixd.V,.5V,.8V,.5V, 3.3V or 5.V Output Maximum Dropout.4V at Full Load Currnt Fast Transint Rspons Built-in Thrmal Shutdown Output Currnt Limiting Good Nois Rjction Packags: TO-, TO-5, TO-63 RoHS-compliant halogn-fr packags Dscription 3A Low Dropout Rgulator Th APE85 is a low dropout positiv adjustabl or fixd-mod rgulator with minimum output currnt capability of 3.A. Th product is spcifically dsignd to provid a wll-rgulatd supply for low-voltag IC applications such as high-spd bus trmination and low currnt 3.3V logic supplis. Th APE85 is also wll suitd for othr applications such as VGA cards, and is guarantd to hav lss than.4v dropout at full load currnt, making it idal for providing wll-rgulatd outputs of.v to 5.V from inputs up to V inputs. Ordring Information APE85x-yy-HF-3Tx Packag: H: TO-5 P: TO- S: TO-63 Output Voltag : Blank = =.V 5 =.5V 8 =.8V 5 =.5V 33 = 3.3V 5 = 5.V Packing: TB = Tubs (TO-) TR = Tap and rl (TO-5, TO-63) Typical Applications 5.V to 3.3V Fixd Mod Rgulator ustabl Rgulator 5V C µf 5V C µf GND C µf 3.3V/3A R R Ω Ω C µf.5v/3a Tab is Tab is Not: V VREF O = ( + R R ) /8

2 Absolut Maximum Ratings Symbol Paramtr Rating Unit DC Supply Voltag -.3 to V P D Powr Dissipation Intrnally Limitd T ST Storag Tmpratur -65 to +5 C T OP Oprating Junction Tmpratur Rang to +5 C Elctrical Spcifications Sym. Paramtr Conditions (Nots) Min. Typ. Max. Unit V REF Rfrnc Voltag Io=mA, Tj=5 o C, (-)=.5V V APE85-XX I O =ma, V OUT +.5V<V IN <V, T J =5 o C..5 % APE85- I OUT = ma, T J = 5 o C, 3V<V IN <V V Lin Rgulation Load Rgulation APE85-5 I OUT = ma, T J = 5 o C, 3V<V IN <V V APE85-8 I OUT = ma, T J = 5 o C, 3.3V<V IN <V V APE85-5 I OUT = ma, T J = 5 o C, 4V<V IN <V V APE85-33 I OUT = ma, T J = 5 o C, 4.8V<V IN <V V APE85-5 I OUT = ma, T J = 5 o C, 6.5V<V IN <V V APE85- V N =3.3V, ma<io<3a, T J =5 o C (Not,) % APE85- V N =3V, ma<io<3a, T J =5 o C (Not,) mv APE85-5 V N =3V, ma<io<3a, T J =5 o C (Not,) 5 mv APE85-8 V N =3.3V, ma<io<3a T J =5 o C (Not,) 5 8 mv APE85-5 V N =4V, ma<io<3a T J =5 o C (Not,) 5 mv APE85-33 V N = 5V, ma<io<3a, T J =5 o C (Not,) 6 33 mv APE85-5 V N = 8V, ma<io<3a, T J =5 o C (Not,) 4 5 mv Vo Dropout Voltag Io=3.A ( = % ).3.4 V Currnt Limit -=5V 5. A Minimum Load θ JA Currnt Tmpratur Stability Thrmal Rsistanc Junction-to-Ambint (No hat sink ;No air flow) 5 ma Io=mA.5 % TO-5 TO-63 TO O C/W θ JC Thrmal Rsistanc Junction-to-Cas TO-5: Control Circuitry/Powr Transistor TO-63: Control Circuitry/Powr Transistor TO-: Control Circuitry/Powr Transistor.65/.7.65/.7 O C/W Not : S thrmal rgulation spcifications for changs in output voltag du to hating ffcts. Lin and load rgulation ar masurd at a constant junction tmpratur by low duty cycl puls tsting. Load rgulation is masurd at th output lad = /8 from h packag. Not :Lin and load rgulation ar guarantd up to th maximum powr dissipation of 5W. Powr dissipation is dtrmind by th diffrnc in input and output and th output currnt. Guarantd maximum powr dissipation will not b availabl ovr th full input/output rang. /8

3 Pin Configuration TO63 TO5 TO FRONT VIEW FRONT VIEW FRONT VIEW 3 (GND) 3 (GND) 3 (GND) Tab is Tab is Tab is Pin Dscriptions Nam I/O Pin No. Function (GND) I O I 3 ustabl (Ground only for fixd mod) A rsistor dividr from this pin to th pin and ground sts th output voltag. Th output of th rgulator. A capacitor of at last uf with (.5Ω <ESR<Ω ) must b connctd from this pin to ground to nsur stability. Th input pin of rgulator. Typically a larg storag capacitor with (.5Ω<ESR<Ω) is connctd from this pin to ground to nsur that th input voltag dos not sag blow th minimum dropout voltag during th load transint rspons. This pin must always b.4v (.3V) highr than in ordr for th dvic to rgulat proprly. Block Diagram CURRENT LIMIT.5V + (.V) Thrmal Shutdown + - THIS PRODUCT IS SENSITIVE TO ELECTROSTATIC DISCHARGE, PLEASE HANDLE WITH CAUTION. USE OF THIS PRODUCT AS A CRITICAL COMPONENT IN LIFE SUPPORT OR OTHER SIMILAR SYSTEMS IS NOT AUTHORIZED. APEC DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. APEC RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. 3/8

4 Application Information Introduction Th APE85 adjustabl Low Dropout (LDO) rgulator is a 3-trminal dvic that can asily b programmd with th addition of two xtrnal rsistors to any voltag within th rang of.v to -.4V. Th APE85 only nds.4v diffrntial btwn and to maintain output rgulation. In addition, th output voltag tolrancs ar also xtrmly tight and thy includ th transint rspons as part of th spcification. For xampl, Intl VRE spcification calls for a total of +/- mv including initial tolranc, load rgulation and to 3.A load stp. Th APE85 is spcifically dsignd to mt th fast currnt transint nds as wll as providing an accurat initial voltag, rducing th ovrall systm cost with th nd for fwr output capacitors. Output Voltag Stting Th APE85 can b programmd to any voltags in th rang of.v to -.4V with th addition of R and R xtrnal rsistors according to th following formula: = Vrf (+ R/R) +Iadj *R, whr Vrf =.5 typically, Iadj = 55uA typically R&R as shown at blow APE85 Vrf R Iadj=55uA R Th APE85 kps a constant.5v btwn th output pin and th adjust pin. By placing a rsistor R across ths two pins a constant currnt flows through R, adding to th Iadj currnt and into th R rsistor producing a voltag qual to th (.5/R)*R+Iadj*R which will b addd to th.5v to st th output voltag. This is summarizd in th abov quation. Sinc th minimum load currnt rquirmnt of th APE85 is ma, R is typically slctd to b Ω rsistor so that it automatically satisfis th minimum currnt rquirmnt. Notic that sinc Iadj is typically in th rang of 55uA it only adds a small rror to th output voltag and should only b considrd whn a vry prcis output voltag stting is rquird. For xampl, in a typical 3.3V application whr R=Ω and R=Ω th rror du to Iadj is only.3% of th nominal st point. Load Rgulation Sinc th APE85 is only a 3-trminal dvic, it is not possibl to provid tru rmot snsing of th output voltag at th load. Th bst load rgulation is achivd whn th bottom sid of R is connctd to th load and th top-sid of R rsistor is connctd dirctly to th cas or th pin of th rgulator and not to th load. It is important to not that for high currnt applications, this can rprsnt a significant prcntag of th ovrall load rgulation and on must kp th path from th rgulator to th load as short as possibl to minimiz this ffct. Stability Th APE85 rquirs th us of an output capacitor as part of th frquncy compnsation in ordr to mak th rgulator stabl. For most applications an aluminum lctrolytic capacitor of at last µf nsurs both stability and good transint rspons. Thrmal Dsign Th APE85 incorporats an intrnal thrmal shutdown that protcts th dvic whn th junction tmpratur xcds th maximum allowabl junction tmpratur. Although this dvic can oprat with junction tmpraturs in th rang of 5 o C, it is rcommndd that th slctd hat sink b chosn such that during maximum continuous load opration th junction tmpratur is kpt blow this tmpratur. Layout Considration Th output capacitors must b locatd as clos to th trminal of th dvic as possibl. It is rcommndd to us a sction of a layr of th PC board as a plan to connct th pin to th output capacitors to prvnt any high frquncy oscillation that may rsult du to xcssiv trac inductanc. 4/8

5 Typical Prformanc Charactristics... 8 Dropout Voltag (V) Tj = 5 o C Tj = 5 o C Output Voltag Dviation (%) I load=.5a. 3 4 Output Currnt (A) Dropout Voltag vs Output Currnt Tmpratur ( o C) Load Rgulation vs Tmpratur Output Voltag Chang (%) Tmpratur ( o C) Prcnt Chang in Output Voltag vs Tmpratur Output Voltag Dviation (%) Input Voltag (V) Lin Rgulation Output Voltag Dviation (mv) Input Voltag (V) 7.5 Cin=uF 6.5 Cout=uF Tantalum TIME (us) Lin Transint Rspons Load Currnt (A) Output Voltag Dviation (mv) Cin=uF Cout=uF Tantalum Prload=mA TIME (us) Load Transint Rspons 5/8

6 Packag Dimnsions: TO- E E φ b L L5 D D L4 L A c SYMBOLS Millimtrs MIN NOM MAX A b D c E L L D c.5 5. REF b L L.6.54 REF φ E 7.4 REF, b c. All dimnsions ar in millimtrs.. Dimnsions do not includ mold protrusions. Marking Information: TO- Product: APE85 85-VV Voltag cod: Blank = ustabl =.V, 5=.5V,...,8=.8V, 33=3.3V, 5=5.V YWWSSS Dat/lot cod (YWWSSS) Y: Last digit of th yar WW: Work wk SSS: Lot cod squnc 6/8

7 Packag Dimnsions: TO-5 D D E3 E E Millimtrs SYMBOLS MIN NOM MAX A A B.4.7. D D E F F E E C B F F. All dimnsions ar in millimtrs.. Dimnsions do not includ mold protrusions. A R :.7~.38 A3 (.mm C Marking Information: TO-5 Lasr Marking Product: APE85 85-VV YWWSSS Voltag cod Blank = ustabl =.V, 5=.5V,...,8=.8V, 33=3.3V, 5=5.V Dat/lot cod (YWWSSS) Y: Last digit of th yar WW: Work wk SSS: Lot cod squnc 7/8

8 Packag Dimnsions: TO-63 L E 3 b b D L3 L4 Millimtrs SYMBOLS MIN NOM MAX A A..5.3 A b.7.9. b c c D E L L L A. All dimnsions ar in millimtrs.. Dimnsions do not includ mold protrusions. c A c θ Marking Information: TO VV YWWSSS Product: APE85 Voltag cod: Blank = ustabl =.V, 5=.5V,...,8=.8V, 33=3.3V, 5=5.V Dat Cod (YWWSSS) Y: Last digit of th yar WW: Work wk SSS : Lot cod squnc 8/8