LP1083

LP1083 FCI | Alldatasheet

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LT1083/LT1084/LT1085 7.5A, 5A, 3A Semiconductor Low Dropout Positive Adjustable Regulator

DESCRIPTION

lhe LT1083 series of positive adjustable regulators regulator and power source circuitry under overland are designed to provide 7.5A, 5A and 3A with conditions. higher efficiency than currently available devices. All The LT1083/LT1084/LT1085 devices are pin. imemnal circuitry is designed to operate downto 1V compatible with older three-terminal regulators.A 10, F input-to-output differential and the dropout voltage is fully ‘output capacitor is required on these new devices. However, specified as a° function of load current Dropout is this is included in most regulator designs. guaranteed ata maximum of 1.5V at maximum output Unlike PNP regulators, where up to 10% of the current, decreasing at lower load currents. On-chip output current is wasted as quiescent current the LT1083 trimming adjusts the reference voltage to 1%. Current quiescent current flows into the load, increasing efficiency. limit is also trimmed, minimizing the stress on both the ‘© Fixed Versions Available PPLIGATIONS + Three- Terminal Adjustable + High Efficiency Linear Regulators * Output Current of 3A, 5A 7.54 + Post Regulators for Switching Supplies * Operates Down to 1V Dropout © Constant Current Regulators * Guaranteed Dropout Voltage at + Battery Chargers Multiple Current Levels , DEVICE ‘OUTPUT CURRENT” * Line Regulation: 0.015% oes Te » LT1084 5.0A + Load Regulation: 0.01% T1085 3.0A * 100% Thermal Limit Functional Test PACKAGE/ORDER INFORMATION Fe oy ORDER: PART: Say a a ae = ER ce te a a -— eet, 4 LINOCe p= | rtosscm ay Li i: a me a ae J [ieee . | see (oS ke. | alee | fo. a As SSA | ttioasiz a eee eg (| MWHPACKace SotpeReD To O5INy) “PING Adustabie =| =| COPPERAREAOVERBACKSIDEGROUNG = zest | PLANE.OR INTERNAL POWER PLANE | ee ee SdaeceW DEPENDING ON MOUNTING} 5 aS Hie aie ee 4 ATECHNIQUES) GoM cau aalE 3-9

" oa LT1083/LT1084/LT1085 7.5A, 5A, 3A € sae * SPE Semiconductor Low Dropout Positive Adjustable Regulator ABSOLUTE MAXIMUM RATINGS Power Dissipation .ecssnnnnnmnees Internally limited "YM" Grades : Control Section ..conenenn “SS% 10 150% Input-to-Output Voltage Differential Power Transistor sone SSS to 200 C8 C1066 anneninmnnnmnnanonnnnnnendOY Storage Tempernture Rage venrennenennr6S% to 150 Operating Junction Temperature Range PRECONDITIONING " C" Grades: Control Section omnes 0% 10125% 100% thermal shutdown functional test Power Transistor nO 10 150% "1" Grades : Control Section wnnenenedO% t0 125% SV,7.5A Regulator Dropout Voltage vs Output Current E ‘Cory Tr tr CrPT rrr rr Vor 26.5V. IN LT1083 oUT| SV AT 7.5A Pry rr ADL re A + a — 10m 10uF z Pr rrr rt Peog | TANTALUM a CEPT Tt Cer rerr| + Lee | *REQUIRED FOR STABILITY Eo CYT TT TTT rT e ” ! oureur cuneest LECTR CHARACTERISTICS PRRARETERG ES ROMMNIONS a NPM NES Reference Voltage | lour=100mA, T; #25 1.238 1.250 1.262 Vv (VorVour) = 3V 10mAs Tour s Inn voap 1.225 1.250 1270 v 1SVs (VorVour) = 25V (Notes 3, 5,6) Line Regulation Teoan= l0mA, 1.5V = (VorVour) = 1SV, 17 = 25 © (Notes 0015 02 % 12) 0035 02 % M Grades: 15V= (VorVour) = 35V (Notes 12) [of 00s 05 | % C, 1 Grades : 15V= (Vor-Vour) = 30V (Notes 12) [ef oo o5 | % SSS 3-10

1LT1083/LT1084/LT1085 7.5A, 5A, 3A Semiconductor Low Dropout Positive Adjustable Regulator

ELECTRICAL CHARACTERISTICS

Load Regulation (Vav-Vour ) = 3V TomA s lours Tras vosw T2510 (Notes 1,235) 01 03 % 02 04 % ‘Current Limit LT1083 (Vow Vout SV 8.0 95 A (Woe Vour = 25V o4 10 A LT1084 (Vo-Vour SV 5.5 6.5 A (Vin-Vour =25V 03 06 A LT1085 (WarVour 55V 32 40 A 'Vav-Vour E25V_ 0.2 0.5 A ‘Minimum Load Current [(Ww-Voure25V Cd @ SA ‘Thermal Regulation Ta=25°C, 30ms Pulse LT1083 0.002 0.010 | ww L108 0.003 0.015 | WW LTIo8s 0.000.020 _| sw Ripple Rejection T= 120 Hz Cap: =25u F,Cour =25u F Tantalum [elo «| Tour=Iput Loan . (Viv - Vour) = 3V (Notes 5,6,7) 60 75S. BB eee pee 121 ‘Agus Pin Current Change TOMAS lout Sina vox [. | LSV_S (Vix-Vour) S 25V (Note 5: pA ‘Temperature Stabilit es ong Term Stability [Tet25*C 100s os % RMS Output Noise (9 of Voor) | Tan5°C [| ous | 1OHy= sf < 10KHz % "Thermal Resistance Tunction-to- | Control Cireuitry/Power Transistor Case LTio8s ZM: Packages 0.78.0 | ecrw The @ denotes the specifications which apply over the full | The Ine: tos curve is defined es the minimum value of operating temperature range. current limit 2s & function of input to output voltage. Note Note 1: See thermal regulator specification for change in output | st 6OW power dissipstion for the LT1083 ( 30W for the LT1084 yw 5) is only achievabl vollge due to beating effects Load and line regulation are | @), a for the LTI08 » "8 only acevanie over ® measured sat a constant junction temperature by low duty | limited rage of input-to- ouput voltage cycle pulse testing. Note 4:Dropout voltage is specified over the full output current Note 2: Line and load regulation are guaranteed up to the | "#86 of the device, Test points and limits are shown on the maximum power dissipation (60W for LT1083,30W for the Dropout Voltage curve. LT1084(Z) and 30W for the LTI085). Power dissipation is | Note S: For LTIO83 tna. vos is SA for SS TO determined by the input /output differential and output current. | and 7.5A for Ty= 40. Guaranteed maximum power dissipation will not be available | Note 6: 1.7V (VorVour)s 25V for TD62084 at -$5e 57, ‘over the full input /output voltage range <40¢. Note 3: Innz vox is defined in the current limit curves | Note 7:Dropout is 1.7V maximum for TD62084 at -55% = Ty s40e ; en 3-11

LT1083/LT1084/LT 1085 7.5A, 5A, 3A Low Dropout Positive Adjustable Regulator LT1083 bropout Voltage Shon circut Current Load Regulation : : 5° (iooeare chanics sr rons] 2"T LT] ] e a E | — L fecorss=aen ee WANN Cee Paes JEAN gon LETT | ene FA al Ea = ee ee Se _ Cee oo £ Wwe NY | | | eal LL LT ee a \\ =a * ‘OUTPUT CURRENT(A) INPUT/OUTPUT DuTERDTuldY) coe TEMPERATURE(‘C) aps cas ADJ GOT brevet Voltage Short-Cireut Current Coad Regulation i i ee & [wemewe Kot SiRet oe ETT ETT i Oper Sea ecco i — <a es Re foot [Bees ERR ES 5 ee Eee NEES E ree N ee AA \\ vos * OUTPUT CURRENT(A) INPUT/OUTPUT DIFFERENTIALLY) ‘TEMPERATURE(°C) ADJ G04 ADJ GOS ‘ADJ GOS Dropout Voltage Short-Cireut Current Load Regulation = 6 0.29 pees | OO Se a See ee eee Pepe CE IPR | Ere 5 _— gat aS B -0.03 ptt PBeees ONReH pect te aS NNO ecoss gooey OS ETT TTT OUTPUT CURRENT(A) INPUT/OUTPUT DIFFERENTIAL(V) ‘TEMPERATURE( C) ADJ G07 ADJ G08 ADJ GOS ce 3-12

Fol LT1083/LT1084/LT 1085 7.5A, 5A, 3A Semiconductor Low Dropout Positive Adjustable Regulator (TYPICAL PERFORMANCE CHARACTERISTICS Minimum Operating Current Temperature Stability Adjust Pin Current pe | "TTT ge ee eg A 0 Foes aa Fe-t trie eicrrrrryy ¢ | sRCler er Fp a a a ee oS ma Ae ee zat aot rr 5 jpop et Eat TT iT & > ——_ cd ne a ; 1 gat LTT i pee pit i Eee a ot C1 we LTT TT a a Inpur/ourpur porERENTALY) TExPERATURE(*C) ‘eurerarume(*) ADJ G10 ADJ GIT ADJ G12 LT1083 LT1083 . LT1083 Ripple Rejection Ripple Rejection vs Current Maximum Power Dissipation" 100) 100, 1005 CUTE ar Sa aor ein oO a = ‘o -” ST Be —S= 0 eee ] g HET TT vo -Voun = 3¥| g n=20KHs 1 fossil a nt [LH tstteoe Ff seHhoeern 2 wo wats el 0 = Ewe § S[emcven avert MM TT | & 8S see

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pe earn ti ol eer TT TT LL tT o CATT TTT o a | oCL it TTA I a a rT rr ‘W070 80 wo 100 110120190 140180 rapquencvtts OUTPUT CURRENTIA) PE ADIGI3: ADJ G14 ADJ G15 LT1084 LT1084 LT1084 Ripple Rejection Ripple Rejection vs Current Maximum Power Dissipation 109 Cent aa aera] 109 ° Sa I ee: ed ee LT TT

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Fol LT1083/LT1084/LT1085 7.5A, 5A, 3A Semiconductor Low Dropout Positive Adjustable Regulator (TYPICAL PERFORMANCE CHARACTERISTICS LT1085 LT1085 ‘LM1085 Ripple Rejection Ripple Rejuction vs Current Maximum Power Dissipation* > sae y ee ee 2 COM esr .——— J «

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FREQUENCT(H) OUTPUT CURRENT(A) as ware oy" uniuItA ONGTON TRUPERATURE ADI G19 ADJ G20 ADJ G21 LM1083 LM1083 ‘LM1083 Load Transient Response Load Transient Response Load Transient Response

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LT1083/LT1084/LT1085 7.5A, 5A, 3A Vu n p) 1 ty Se aie Ra 3 i it cal mi tir Af tL Af Your D ves

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The LT1083 family of three-terminal adjustable regulators is smaller than this can be used with the LT1083. Many different easy to use and has all the protection features that are expected types of capacitors with widely varying characteristics are in high performance voltage regulators. They are short-circuit available. These capacitors differ in capacitor tolerance protected, and have safe area protection as well as thermal (sometimes ranging up to 2 100% ), equivalent series shutdown to tum off the regulator should the junction resistance ,and capacitance tempereture coefficient The temperature exceed about 165% 1504 F of 224 F values given will ensure stability. These regulators are pin compatible with older three- ‘When the adjustment terminal is bypassed to improve the terminal adjustable devices, offer lower dropout voltage and ripple rejection, the requirement for an output capacitor more precise reference tolerance. Further, the reference increases. The value of 22 yF tantalum or 150uF stability with temperature is improved over older types of aluminum covers all cases of bypassing the adjustment regulators. The only circuit difference between using the terminal. Without bypassing the adjustment terminal , LT1083 family and older regulators is that this new family smaller capacitors can be used with equally good results requires an output capacitor for stability and the table below shows approximately what size cree monte The crit design wedin tbe LTIO83 famaly requies we | @&ECOMMENDED CAPACITOR VALUES _) use of an output capecitor as part of the device frequency INPUT ADSUSTME compensation. For all operating conditions, the addition of nF Nese 150, F aluminum electrolytic ora 22 F solid tantalum on the output will ensure stability. Normally, capacitors much a 3-15

LT1083/LT1084/LT1085 7.5A, 5A, 3A casue device safety under shor-icit condos. Normally, capacitor values on the order of 100, F are Diodes between input and output are usually not used in the output of many regulators to ensure good needed.The internal diode between the input and the transient response with heavy load current changes. Output output pins of the LT1083 family can handle capacitance can be increased without limit and larger microsecond surge currents of SOA to 100A. Even with values of output capacitor further improve stability and large output capacitances, it is very difficult to get transient response of the LT1083 regulators. those values of surge currents in normal operations. Another possible stability problem that can occur in Only with a high value of output capacitors,such as ‘monolithic IC regulators is current limit oscillations. These 1000, F to 5000..F © and with the input pin can occur because , in current limit, the safe area instantaneously shorted to ground ,can damage occur. A protection exhibits a negative impedance . The safe area crowbar circuit at the input of the LT1083 can generate protection decreases the current limit as the | input-to- those kinds of currents, and a diode from output to input output voltage increases. That is the equivalent of is then reconimended . Normal power supply cycling or having negative resistance since increasing voltage even plugging and unplugging in the system will not causes current to decrease, Negative resistance during generate current large enough to do any damage. current limit is not unique to the LT1083 series and has The adjustment pin can be driven on a transient basis been present on all power IC regulators. The value of the + 25V, with respect tothe output without any device negative resistance is a function of how fast the current degradation. Of course, as with any IC regulator, limit is folded back as input-to-output voltage increases . exceeding the maximum input to output voltage This negative resistance can react with capacitors or differential cause the internal transistors to break down inductors on the input to cause oscillation during current and none of the protection circuitry is functional. limiting. Depending on the value of series resistance, the overall circuitry may end up unstable . Since this is a system problem , it is not necessarily easy to solve; woe however, it dose not cause any problems with the IC (OPTIONAL) regulator and usually be ignored. iret Vor IN = LT1083 OUT ‘Vour In normal operation, the LT1083 family does not need ADJ E rial com any protection diodes. Older adjustable regulators 1s0uF required protection diodes between the adjustment pin i le «| and the output and from the output to the input to = t+ i prevent over stressing the die. The internal current paths on ° " * the LT1083 adjustment pin re limited by internal tesistors. Thereforeeven with capacitors on the aero adjustment pin, no protection diode is needed to oe 3-16

LT1083/LT1084/LT1085 7.5A, 5A, 3A Semiconductor Low Dropout Positive Adjustable Regulator OVERLOAD RECOVERY Like any of the IC power regulators , the LT1083 has safe ‘At 120Hz the adjust pin capacitor should be 25, F if area protection. The safe area protection decreases the RI=100Q . At 1OKHz only 0.22 F is needed. current limit as input-to-ourpot voltage increase and For circuits without an adjust pin bypass capacitor, the keeps the power transistor inside a safe operating region ripple rejection will be a function on of output voltage. for all values of input-to-output voltage. The LT1083 ‘The output ripple will increase directly asa ratio of the protection is designed to provide some ourput current at output voltage to the reference voltage (Vour/Vaer ). For all values of input-to-ourput voltage up to the device example, with the output voltage equal t05V and no breakdown. adjust pin capacitor, the output ripple will be higher by the ‘When power is first turned on , as the input voltage rises, ratio of SV/1.25V or four times large. Ripple rejection the output follows the input, allowing the regulator to start will be de-graded by 124B from the value shown on the up into very heavy loads. During the start-up , as the input ‘ypical curve. voltage is rising, the imput-to-output voltage differential OUTPUT VOLTAGE remains small, allowing the regulator to supply large ‘output currents, With high input voltage, a problem can The LT1083 develops a 1.25V reference voltage ‘occur wherein removal of an output short will not allow the between the output and the adjust terminal (see ‘output voltage to recover. Older regulators , such as the Figure 1). By placing arresistor RI between these two HB7800 series, also exhibited this phenomenon, so it is terminals , a constant current is caused to flow through not unique to the LT1083. RI and down through R2 to set the overall output PPLICATIONS INFORMATION voltage. Normally this current is the specified minimum . load current of 10mA Because I,p; is very small and ‘The problem occurs with 2 heavy output load when the oe with the through Rl, j input voltage is high and the output voltage is low, such as constant Wi ee tee _ a immediately after removal of a short. The Joad line for {represents & Small error and} can usually be ignon such a load may intersect the output current curve at two points.If this happens , there are two stable output operating points for the regulator. With this double intersection , the power supply may need to be cycled va Vour down to ero and brought up again to make the output + sp ve $s recover. 1OMF oy RIPPLE REJECTION 1 Sour Re The typical curves for ripple rejection reflect values + Vowr =Vaer(1+B2 )+ioiR2 = for a bypassed adjustrient pin. This curve will be tme for all values of output voltage. For proper ADIFOL bypassing and ripple rejection approaching the values shown, the impedance of the adjust pin capacitor at the TIGURE 1.BASIC ADJUSTABLE REGULATOR ripple frequency should be less than the value of Rl, (normally 1002 to 120@). The size of the required adjust pin capacitor is a function of the inpet ripple frequency a 3-17

LT1083/LT1084/LT1085 7.5A, 5A, 3A eo: Low Dropout Positive Adjustable Regulator Because the LT1083 is a three-terminal device , it is not under overload conditions . For continuous normal load possible to provide true remote load sensing . Load conditions however, maximum junction temperature regulation will be limited by the resistance of the wire ratings must not be exceed . It is important to give careful connecting the regulator to the load. The data sheet consideration to all sources of thermal resistance from specification for load regulation is measured at the junction to ambient. This includes junction-to-case. case-to- bottom of the package. Negative side sensing is a heat sink interface,and heat sink resistance itself, New uve Kelvin connection, with the bottom of the output thermal resistance specifications have been developed to divider remumed to the negative side of the load. Although more accurately reflect device temperature and ensure it may not be immediately obvious , best load regulation safe operating temperatures. The data section for these is obtained when the top of the resistor divider RI is new regulators provides a separate thermal resistance and connected directly to the case not 10 the load. This is maximum junction temperamre for both the Control illustrated in Figure 2 . If R1 were connected to the load, Section and the Power Transistor. Previous regulators,with the effective resistance between the regulator and the a single junctionto - case thermal —resistance Toad would be: specification, used an average of + two values provided here and therefore could allow excessive PARASITIC junction temperatures under certain conditions of ambient Ve fs snows oor temperature and heat sink resistance . To avoide this fy . possibility , calculations should be made for both sections mB R toensure that both thermal limits are met. . Re" Junction-to-case thermal resistance is specified from the CONNEGT We 10 LOB IC junction to the bottom of the case directly below the << die.This is the lowest resistance path for heat flow. . Proper mounting is required to ensure the best possible ‘ADI Po2 thermal flow from this area of the package to the AGURE 2.COMRECTIONS FOR BEST LOAD heat sinkThermal compound at the case-to-heat sink REGULATION interface is strongly recommended . If the case of the conductive spacer can be used, as long as its added Connected as shown ,Rp is not multiplied by the drivider contribution to thermal resistance is considered. Note that radio, Rp is about 0.0042 per foot using 16-gauge the case of all devices in this series is electrically wire. This translates to ¢mV/M-at 1A load current, so. it connected to the output. is important to keep the positive lead between regulator and load as short as possible and use large wire or PC board ‘traces. The LT1083 series of regulators have intemal power and thermal limited circuitry designed to protect the device nn 3-18

LT1083/LT1084/LT1085 7.5A, 5A, 3A Semiconductor Low Dropout Positive Adjustable Regulator For example,using an LT1083 (TO-3P, Commercial) and assuming: Vpy (max continuous) =9V, Vour=SV, lou:=6A, TetT59 , © wearson =1YC/W @ case-rosmat sox "0.2% /W for K package with thermal compound. Power dissipation under these conditions is equal to: Po=(VarVour)(lou:)=24W Junction temperaure will be equal to:TTx*Pp (@ nearsoxe® caseomearsnx+6 1c) For the Control Section:T3=75% +26W(1% /W+0.21¢ /M#0.6%C/W)=118% 118°C <150% =Thux(Power Transistor Commercial Range) For the Power Transistor: TI=75*c +24W(1C/W+0.2% IM+1.6C/W)=142 142 <150°C =Tpaax(Power Transistor ‘Commercial Range) In both cases the junction temperature is below the maximum rating for the respective sections, ensuring reliable operation. ee PICAL APPLICATIONS 7.SVariable Regulator m C30B Lim OV TO 35V a ww ut1083 OUT ov To 358 4 $ | re ed == : inaig ox = > = [3 Sixpur we 1sv 0 Sank" 2.7K 10K . rca a K 200K Tt sd & 10K 2N3904 ° ° x] fa XT. 1sv IEE 15v -- * 1% FILM RESISTOR - L:DALE TO-5 TYPE T2: STANCOR 112-2003 GENERAL PURPOSE REGULATOR WITH SCR PREREGULATOR ‘TO LOWER POWER DISSIPATION. ABOUT 1.7V DIFFERENTIAL IS MAINTAINED ACROSS THE LT1083 INDEPENDENT OF OUTPUT ADITAIO VOLTAGE AND LOAD CURRENT ee 3-19

LT1083/LT1084/LT1085 7.5A, 5A, 3A Semiconductor Low Dropout Positive Adjustable Regulator PARALLELING REGULATORS 2 reer p30 wine AD) voor #3 25v(1+82) |= > ae eousa iN T1083 OUT J pe “THE, 136 MIRE aces Rigivegeyed IsUmiNG cum SeaReNc BISwEnN sone BEVicES Zee 1otsa’s ADITANS IMPROVING RIPPLE REJECTION “ ao Te 3 + ADL RL | OME 155: 150ur I fe 355 = 2our" SR a +1 mpnoves nipPie_ReseonoN Se SHOULD bueRI AT RIPPLE FREQUENCY Losaa’s ADITAD REMOTE SENSING Rp . Vue IN LT1083 OUT (UAX_DRQR 300m) Your aD BV i RE i Ru RETURN toasus aDsTaas ee 3-20

LT1083/LT1084/LT1085 7.5A, SA, 3A Semiconductor Low Dropout Positive Adjustable Regulator HIGH EFFICIENCY REGULATOR WITH SWITCHING PREREGULATOR im Vw IN LT71083. ovT| New: 10KS MR1122 [10,000HF, 240 aw PEt] an26 BS soe 10K < av aps Tas 1wo1a 1.2V TO 18V ADJUSTABLE REGULATOR SV REGULATOR WITH SHUTDOWK * Vor 26.57 IW Lt1089 ovr] Vour* DI Ra, Vor IN LT1083 OUT ‘Vour ‘Whoue = Four ADL F fa sy | sre il Sour 4 + Ss + ™ 3K 365 =p 100HF * Vours1.25v(1+B2) “F *OUTPUT SHUTS DOWN To 1.3V ADITAGT ADITAOB AUTOMATIC LIGHT CONTROL PROTECTED HIGH CURRENT LAMP DRIVER we BN " o-s DJ 2x TTL LOAD. a ADJ + pti 1 | 10KF 100MF cmos I -6 | i ADITAG® ADITAIO a 3-21