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查询LT1086-12供应商LT1086 Series1.5A Low Dropout PositiveRegulators Adjustable andFixed 2.85V, 3.3V, 3.6V, 5V, 12VFEATURESsssssssssDESCRIPTIO3-Terminal Adjustable or Fixed2.85V, 3.3V, 3.6V, 5V, 12VOutput Current of 1.5A (0.5A for LT1086H)Operates Down to 1V DropoutGuaranteed Dropout Voltage at Multiple Current LevelsLine Regulation: 0.015%Load Regulation: 0.1%100% Thermal Limit Functional TestRipple Rejection >75dBAvailable in 3-Pin TO-220 and 3-Pin DD PackageThe LT®1086 is designed to provide up to 1.5A outputcurrent. All internal circuitry is designed to operate downto 1V input-to-output differential and the dropout voltageis fully specified as a function of load current. Dropout isguaranteed at several operating points up to a maximumof 1.5V at maximum output current. Dropout decreases atlower load currents. On-chip trimming adjusts the refer-ence/ouput voltage to 1%. Current limit is also trimmed,minimizing the stress on both the regulator and powersource circuitry under overload LT1086 is pin compatible with older 3-terminal adjust-able regulators. A minimum 10µF output capacitor isrequired on these LT1086 offers excellent line and load regulation speci-fications and ripple rejection exceeds 75dB even at themaximum load current of 1.5A. The LT1086 is floatingarchitecture with a composite NPN output stage. All of thequiescent current and the drive current for the outputstage flows to the load increasing LT1086 is available in a 3-pin TO-220 package and aspace-saving surface mountable 3-pin DD package., LTC and LT are registered trademarks of Linear Technology Corporation.

UAPPLICATIO SssssssSCSI-2 Active TerminatorHigh Efficiency Linear RegulatorsPost Regulators for Switching SuppliesConstant Current RegulatorsBattery ChargersMicroprocessor SupplyTYPICAL APPLICATIOMINIMUM

INPUT/OUTPUT

DIFFERENTIAL

(V)25V to 3.3V RegulatorINDICATES GUARANTEED TEST POINT–55°C ≤ TJ ≤ 150°C0°C ≤ TJ ≤ 125°CVIN

≥ 4.75V

10µF*TANTALUMINLT1086-3.3OUTGND3.3V AT 1.5A10µFTANTALUM1TJ = –55°CTJ = 25°CTJ = 150°CLT1086 • TA01*MAY BE OMITTED IF INPUT SUPPLY IS WELL BYPASSED WITHIN 2" OF THE LT108600ULT1086 Dropout Voltage10.5OUTPUT CURRENT (A)1.5LT1086 • TA02U1086ff1

LT1086 SeriesABSOLUTE MAXIMUM RATINGS(Note 1)Internally LimitedInput Voltage*.........................................................30VOperating Input 25V2. 18V3.3V, 3.6V, and 25VOperating Junction Temperature Range“C” 0°C to 125°0°C to 150°C“I” –40°C to 125°–40°C to 150°C“M” –55°C to 150°–55°C to 200°CStorage –65°C to 150°CLead Temperature (Soldering, 10 sec)..................300°C* Although the device’s maximum operating voltage is limited, (18V for a2.85V device, 20V for a 5V device, and 25V for adjustable and12V devices) thedevices are guaranteed to withstand transient input voltages up to 30V. Forinput voltages greater than the maximum operating input voltage somedegradation of specifications will occur. For fixed voltage devices operating atinput/output voltage differentials greater than 15V, a minimum external loadof 5mA is required to maintain DITIONING100% Thermal Shutdown Functional E/ORDER INFORMATIONBOTTOM VIEWADJ2VIN13VOUT(CASE)ORDERPART NUMBERFRONT VIEW3TAB ISOUTPUT21M PACKAGE3-LEAD PLASTIC DDVINVOUTADJ(GND)†LT1086CHLT1086MHH PACKAGE3-LEAD TO-39 METAL CANθJA = 30°C/W****WITH PACKAGE SOLDERED TO 0.5IN2 COPPER AREAOVER BACKSIDE GROUND PLANE OR INTERNAL POWERPLANE. θJA CAN VARY FROM 20°C/W TO >40°C/WDEPENDING ON MOUNTING TECHNIQUE.θJA = 150°C/WBOTTOM VIEWVIN2CASE

IS OUTPUTORDERPART NUMBER1ADJ (GND)*K PACKAGE2-LEAD TO-3 METAL CANθJA = 35°C/WLT1086CKLT1086CK-5LT1086CK-12LT1086IKLT1086IK-5LT1086IK-12LT1086MKLT1086MK-5LT1086MK-12FRONT VIEW3TAB ISOUTPUT21T PACKAGE3-LEAD PLASTIC TO-220VINVOUTADJ(GND)†θJA = 50°C/WOBSOLETE PACKAGESConsider the T Package for Alternate Source†For fixed t LTC Marketing for parts specified with wider operating temperature ranges.2UUUUUWWWUWORDERPART NUMBERLT1086CMLT1086CM-3.3LT1086CM-3.6LT1086IMLT1086IM-3.3LT1086IM-3.6ORDERPART NUMBERLT1086CTLT1086CT-2.85LT1086CT-3.3LT1086ITLT1086IT-5LT1086IT-12LT1086CT-3.6LT1086CT-5LT1086CT-121086ff

LT1086 SeriesThe

q denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°TERReference Voltage(Note 3)Output Voltage(Note 3)CONDITIONSLT1086, LT1086HLT1086-2.85LT1086-3.3LT1086-3.6IOUT = 10mA, TJ = 25°C, (VIN – VOUT) = 3V10mA ≤ IOUT ≤ 1.5A, (0.5A for LT1086H), 1.5V ≤ (VIN – VOUT) ≤ 15VIOUT = 0mA, TJ = 25°C, VIN = 5V0V ≤ IOUT ≤ 1.5A, 4.35V ≤ VIN ≤ 18VVIN = 5V, IOUT = 0mA, TJ = 25°C4.75V ≤ VIN ≤ 18V, 0V ≤ IOUT ≤ 1.5AVIN = 5V, IOUT = 0mA, TJ = 25°C5V ≤ VIN ≤ 18V, 0 ≤ IOUT ≤ 1.5A4.75V ≤ VIN ≤ 18V, 0 ≤ IOUT ≤ 1A, TJ ≥ 0°CVIN = 4.75V, IOUT = 1.5A, TJ ≥ 0°CIOUT = 0mA, TJ = 25°C, VIN = 8V0 ≤ IOUT ≤ 1.5A, 6.5V ≤ VIN ≤ 20VIOUT = 0mA, TJ = 25°C, VIN = 15V0 ≤ IOUT ≤ 1.5A, 13.5V ≤ VIN ≤ 25VILOAD = 10mA, 1.5V ≤ (VIN – VOUT) ≤ 15V, TJ = 25°CqqqqqELECTRICAL CHARACTERISTICSMIN1.2381.2252.822.793.2673.2353.5643.5003.5003.3004.9504.900TYP1.2501.2502.852.853.3003.3003.600MAX1.2621.2702.882.913.3333.3653.6363.6723.6723.6725.0505.100UNITSVVVVVVVVVVVVVV%%mVmVmVmVmVmVmVmVmVmV%%mVmVmVmVmVmVmVmVmVmVmVmVVVLT1086-5LT1086-12Line RegulationLT1086, LT1086HLT1086-2.85LT1086-3.3LT1086-3.6LT1086-5LT1086-12Load RegulationLT1086, LT1086Hqq5.0005.00011.88012.00012.12011.76012.00012.2400.0150.0350.30.60.51.00.51.00.51.01.02.00.10.23637362451012241.30.950.20.26615250.30.421.51.25IOUT = 0mA, TJ = 25°C, 4.35V ≤ VIN ≤ 18Vq4.5V ≤ VIN ≤ 18V, IOUT = 0mA, TJ

= 25°Cq4.75V ≤ VIN ≤ 18V, IOUT = 0mA, TJ

= 25°CqIOUT = 0mA, TJ = 25°C, 6.5V ≤ VIN ≤ 20VqIOUT = 0mA, TJ = 25°C, 13.5V ≤ VIN ≤ 25Vq(VIN – VOUT) = 3V, 10mA ≤ IOUT ≤ 1.5A, (0.5A for LT1086H)TJ = 25°C (Notes 2, 3)qLT1086-2.85LT1086-3.3LT1086-3.6VIN = 5V, 0 ≤ IOUT ≤ 1.5A, TJ = 25°C (Notes 2, 3)qVIN = 5V, 0 ≤ IOUT ≤ 1.5A, TJ = 25°C (Notes 2, 3)qVIN = 5.25V, 0 ≤ IOUT ≤ 1.5A, TJ = 25°C (Notes 2, 3)qVIN = 5V, 0 ≤ IOUT ≤ 1A, TJ = 25°CqLT1086-5LT1086-12Dropout Voltage(VIN – VOUT)VIN = 8V, 0 ≤ IOUT ≤ 1.5A,

= 25°C (Notes 2, 3)qVIN = 15V, 0 ≤ IOUT ≤ 1.5A,

= 25°C (Notes 2, 3)qqqLT1086/-2.85/-3.3/-3.6/-5/-12 ∆VOUT, ∆VREF = 1%, IOUT = 1.5A (Note 4)LT1086H∆VREF = 1%, IOUT = 0.5A (Note 4)1086ff3

LT1086 SeriesELECTRICAL CHARACTERISTICSPARAMETERCurrent LimitCONDITIONSThe

q denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°qqqqqqqTYP2.000.150.7000..008MAXUNITSAAAALT1086/-2.85/-3.3/-3.6/-5/-12 (VIN – VOUT) = 5V (VIN

– VOUT) = 25VLT1086H(VIN – VOUT) = 5V(VIN

– VOUT) = 25V(VIN – VOUT) = 25V (Note 5)VIN ≤ 18VVIN ≤ 18VVIN ≤ 18VVIN ≤ 20VVIN ≤ 25V1.500.050.500.02Minimum Load CurrentQuiescient CurrentLT1086/LT1086HLT1086-2.85LT1086-3.3LT1086-3.6LT1086-5LT1086-12TA = 25°C, 30ms pulse1.04mAmAmAmAmAmA%/WdBdBdBdBdBdBThermal RegulationRipple Rejectionf = 120Hz, COUT = 25µF Tantalum, IOUT = 1.5A, (IOUT = 0.5A for LT1086H)LT1086, LT1086HCADJ = 25µF, (VIN – VOUT) = 3VLT1086-2.85VIN = 6VLT1086-3.3VIN = 6.3VLT1086-3.6VIN = 6.6VLT1086-5VIN = 8VLT1083-12VIN = 15VLT1086, LT1086HLT1086, LT1086HTJ = 25°Cqqqqqqq657272726860551200.20.50.30.00315/201.7/4.01.5/4.01.5/4.015Adjust Pin CurrentAdjust Pin CurrentChangeTemperature StabilityLong-Term StabilityRMS Output Noise(% of VOUT)Thermal ResistanceJunction-to-CaseµAµAµA%%%°C/W°C/W°C/W°C/W10mA ≤ IOUT ≤ 1.5A (0.5A for LT1086H)1.5V ≤ (VIN – VOUT) ≤ 15VqqTA = 125°C, 1000 = 25°C, 10Hz = ≤ f ≤ 10kHzH Package: Control Circuitry/Power TransistorK Package: Control Circuitry/Power TransistorM Package: Control Circuitry/Power TransistorT Package: Control Circuitry/Power TransistorNote 1: Absolute Maximum Ratings are those values beyond which the life ofa device may be 2: See Thermal Regulation specifications for changes in outputvoltage due to heating effects. Line and load regulation are measured at aconstant junction temperature by low duty cycle pulse testing. Loadregulation is measured at the output lead ≈1/8" from the 3: Line and load regulation are guaranteed up to the maximum powerdissipation of 15W (3W for the LT1086H). Power dissipation is determinedby the input/output differential and the output current. Guaranteedmaximum power dissipation will not be available over the full input/outputrange. See Short-Circuit Current curve for available output 4: Dropout voltage is specified over the full output current range ofthe device. Test points and limits are shown on the Dropout Voltage 5: Minimum load current is defined as the minimum output currentrequired to maintain regulation. At 25V input/output differential the deviceis guaranteed to regulate if the output current is greater than 10mA.1086ff4

LT1086 SeriesTYPICAL PERFORMANCE CHARACTERISTICS

LT1086 Short-Circuit Current2.5OUTPUT

VOLTAGE

DEVIATION

(%)TJ = 150°CTJ = 25°CTJ = –55°C1.50.100.050–0.05–0.10–0.15–0.20–50–25MINIMUM

OPERATING

CURRENT

(mA)SHORT-CIRCUIT

CURRENT

(A)2.01.00.50GUARANTEEDOUTPUT CURRENTINPUT/OUTPUT DIFFERENTIAL (V)30Temperature Stability2OUTPUT

VOLTAGE

CHANGE

(%)ADJUST

CURRENT

(µA)1POWER

(W)0–1–2–50–255150TEMPERATURE (°C)LT1086 • TPC04LT1086 Ripple Rejection1009080RIPPLE

REJECTION

(dB)700101001k10kFREQUENCY (Hz)100kLT1086 • TPC07VRIPPLE ≤ 3VP-PVRIPPLE ≤ 0.5VP-PRIPPLE

REJECTION

(dB)(VIN – VOUT) ≥ 3V7000VOUT = 5VCADJ = 25µFCOUT = 25µF0.25fR = 20kHzVRIPPLE ≤ 0.5VP-PRIPPLE

REJECTION

(dB)(VIN – VOUT) ≥ VDROPOUTCADJ = 200µF AT FREQUENCIES < 60HzCADJ = 25µF AT FREQUENCIES > 60HzIOUT = 1.5AUWLT1086 • TPC01LT1086 Load Regulation10Minimum Operating Current(Adjustable Device)9876543215INPUT/OUTPUT DIFFERENTIAL (V)35TJ = 150°CTJ = 25°CTJ = –55°C∆I = 1.5A5150TEMPERATURE (°C)LT1086 • TPC02LT1086 • TPC03Adjust Pin Current1403020100–50–255150TEMPERATURE (°C)LT1086 • TPC05LT1086 Maximum PowerDissipation*2015LT1086MKLT1086CT10LT1086CK55110CASE TEMPERATURE (°C)*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURELT1086 • TPC060LT1086 Ripple Rejectionvs Current1009080fR = 120HzVRIPPLE ≤ 3VP-PLT1086-5 Ripple Rejection801001.5VRIPPLE ≤ 3VP-PVRIPPLE ≤ 0.5VP-P(VIN – VOUT) ≥ 3V(VIN – VOUT) ≥ VDROPOUTIOUT = 1.5A101001k10kFREQUENCY (Hz)100kLT1086 • TPC090.751.01.250.5OUTPUT CURRENT (A)LT1086 • TPC081086ff5

LT1086 SeriesTYPICAL PERFORMANCE CHARACTERISTICS

LT1086-5 Ripple Rejectionvs Current1009080RIPPLE

REJECTION

(dB)7000VOUT = 5VCADJ = 25µFCOUT = 25µF0.251.250.751.00.5OUTPUT CURRENT (A)1.5fR = 20kHzVRIPPLE ≤ 0.5VP-PRIPPLE

REJECTION

(dB)fR = 120HzVRIPPLE ≤ 3VP-P(VIN – VOUT) ≥ 3VRIPPLE

REJECTION

(dB)LT1086 Line Transient Response600.3OUTPUT

VOLTAGEDEVIATION

(V)OUTPUT

VOLTAGEDEVIATION

(mV)40200–20–40–60VOUT = 10VIOUT = 0.2ACIN = 1µF TANTALUMCOUT = 10µF TANTALUMCADJ = 0CADJ = 1µF0.10–0.1–0.2–0.3CADJ = 1µFSHORT-CIRCUIT

CURRENT

(A)LOAD

CURRENT

(A)INPUT

VOLTAGEDEVIATION

(V)0TIME (µs)LT1086H Dropout VoltageMINIMUM

INPUT/OUTPUT

DIFFERENTIAL

(V)2INDICATES GUARANTEED TEST POINTOUTPUT

VOLTAGE

DEVIATION

(%)–55°C ≤ TJ ≤ 150°C0°C ≤ TJ ≤ 125°C1TJ = –55°CTJ = 25°CTJ = 150°CRIPPLE

REJECTION

(dB)000.10.30.40.2OUTPUT CURRENT (A)6UWLT1086-12 Ripple Rejection8010010IOUT = 1.5A1001k10kFREQUENCY (Hz)100kLT1086 • TPC11LT1086-12 Ripple Rejectionvs CurrentVOUT = 5VCADJ = 25µFCOUT = 25µF0.250.751.01.250.5OUTPUT CURRENT (A)1.5fR = 20kHzVRIPPLE ≤ 0.5VP-PfR = 120HzVRIPPLE ≤ 3VP-PVRIPPLE ≤ 3VP-PVRIPPLE ≤ 0.5VP-P(VIN – VOUT) ≥ VDROPOUTLT1086 • TPC10LT1086 • TPC12LT1086 Load Transient Response1.2CADJ = 00.2LT1086H Short-Circuit Current1.00.80.60.40.20CIN = 1µF TANTALUMCOUT = 10µF TANTALUMVOUT = 10VVIN = 13VPRELOAD = 100mA1.51.00.500GUARANTEEDOUTPUT CURRENT05101520INPUT/OUTPUT DIFFERENTIAL (V)25200LT1086 • TPC1350TIME (µs)100LT1086 • TPC14LT1086 • TPC15LT1086H Load Regulation0.10∆I = 0.5A0.050–0.05–0.10–0.15–0.20–50–251403020100.5LT1086H Ripple Rejectionvs CurrentfR = 120HzVRIPPLE ≤ 3VP-PfR = 20kHzVRIPPLE ≤ 0.5VP-PVOUT = 5VCADJ = 25µFCOUT = 25µF00.10.30.40.2OUTPUT CURRENT (A)0.55150TEMPERATURE (°C)LT1086 • TPC170LT1086 • TPC16LT1086 • TPC181086ff

LT1086 SeriesTYPICAL PERFORMANCE CHARACTERISTICS

LT1086H Ripple Rejection1009080RIPPLE

REJECTION

(dB)700101001k10kFREQUENCY (Hz)100kLT1086 • TPC19VRIPPLE ≤ 3VP-PVRIPPLE ≤ 0.5VP-P(VIN – VOUT) ≥ 3VPOWER

(W)(VIN – VOUT) ≥ VDROPOUTCADJ = 200µF AT FREQUENCIES < 60HzCADJ = 25µF AT FREQUENCIES > 60HzIOUT = 0.5ABLOCK DIAGRAMUWVADJLT1086H Maximum PowerDissipation*543LT1086MH215110CASE TEMPERATURE (°C)*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURELT1086 • TPC200WVIN+–THERMALLIMIT

1086 • BDVOUT1086ff7

LT1086 SeriesAPPLICATIOS IFORATIOThe LT1086 family of 3-terminal regulators is easy to useand has all the protection features that are expected in highperformance voltage regulators. They are short-circuitprotected and have safe area protection as well as thermalshutdown to turn off the regulator should the temperatureexceed about 165°C at the sense regulators are pin compatible with older 3-terminaladjustable devices, offer lower dropout voltage and moreprecise reference tolerance. Further, the reference stabil-ity with temperature is improved over older types ofregulators. The only circuit difference between using theLT1086 family and older regulators is that they require anoutput capacitor for ityThe circuit design used in the LT1086 family requires theuse of an output capacitor as part of the device frequencycompensation. For all operating conditions, the addition of150µF aluminum electrolytic or a 22µF solid tantalum onthe output will ensure stability. Normally capacitors muchsmaller than this can be used with the LT1086. Manydifferent types of capacitors with widely varying charac-teristics are available. These capacitors differ in capacitortolerance (sometimes ranging up to ±100%), equivalentseries resistance, and capacitance temperature coeffi-cient. The 150µF or 22µF values given will ensure using the LT1086 the adjustment terminal can bebypassed to improve ripple rejection. When the adjust-ment terminal is bypassed the requirement for an outputcapacitor increases. The values of 22µF tantalum or 150µFaluminum cover all cases of bypassing the adjustmentterminal. For fixed voltage devices or adjustable deviceswithout an adjust pin bypass capacitor, smaller outputcapacitors can be used with equally good results. The tablebelow shows approximately what size capacitors are neededto ensure ended Capacitor ValuesINPUT10µF10µFOUTPUT10µF Tantalum, 50µF Aluminum22µF Tantalum, 150µF AluminumADJUSTMENTNone20µFNormally, capacitor values on the order of 100µF are usedin the output of many regulators to ensure good transient8UWUUresponse with heavy load current changes. Output capaci-tance can be increased without limit and larger values ofoutput capacitor further improve stability and transientresponse of the LT1086 r possible stability problem that can occur in mono-lithic IC regulators is current limit oscillations. These canoccur because in current limit, the safe area protectionexhibits a negative impedance. The safe area protectiondecreases the current limit as the input-to-output is the equivalent of having a negitive resis-tance since increasing voltage causes current to ve resistance during current limit is not unique tothe LT1086 series and has been present on all power ICregulators. The value of negative resistance is a function ofhow fast the current limit is folded back as input-to-outputvoltage increases. This negative resistance can react withcapacitors or inductors on the input to cause oscillationduring current limiting. Depending on the value of seriesresistance, the overall circuitry may end up unstable. Sincethis is a system problem, it is not necessarily easy to solve;however, it does not cause any problems with the ICregulator and can usually be tion DiodesIn normal operation the LT1086 family does not need anyprotection diodes. Older adjustable regulators requiredprotection diodes between the adjustment pin and theoutput and from the output to the input to prevent over-stressing the die. The internal current paths on the LT1086adjustment pin are limited by internal resistors. Therefore,even with capacitors on the adjustment pin, no protectiondiode is needed to ensure device safety under between input and output are usually not internal diode between the input and the output pinsof the LT1086 family can handle microsecond surgecurrents of 10A to 20A. Even with large output capaci-tances, it is very difficult to get those values of surgecurrents in normal operation. Only with high value outputcapacitors such as 1000µF to 5000µF, and with the inputpin instantaneously shorted to ground, can damage occur.A crowbar circuit at the input of the LT1086 can generatethose kinds of currents and a diode from output to input isthen recommended. Normal power supply cycling or even1086ff

LT1086 SeriesAPPLICATIONS INFORMATIONplugging and unplugging in the system will not generatecurrent large enough to do any adjustment pin can be driven on a transient basis±25V, with respect to the output without any devicedegradation. Of course as with any IC regulator, exceedingthe maximum input-to-output voltage differential causesthe internal transistors to break down and none of theprotection circuitry is functional.D11N4002(OPTIONAL)VIN

INLT1086ADJOUTR1+VOUTCOUT150µF+CADJ10µFR2LT1086 • AI01Overload RecoveryLike any of the IC power regulators, the LT1086 has safearea protection. The safe area protection decreases thecurrent limit as input-to-output voltage increases andkeeps the power transistor inside a safe operating regionfor all values of input-to-output voltage. The LT1086protection is designed to provide some output current atall values of input-to-output voltage up to the power is first turned on, as the input voltage rises,the output follows the input, allowing the regulator to startup into very heavy loads. During the start-up, as the inputvoltage is rising, the input-to-output voltage differentialremains small, allowing the regulator to supply largeoutput currents. With high input voltage, a problem canoccur wherein removal of an output short will not allow theoutput voltage to recover. Older regulators such as the7800 series also exhibited this phenomenon, so it is notunique to the problem occurs with a heavy output load when theinput voltage is high and the output voltage is low, such asimmediately after a removal of a short. The load line forsuch a load may intersect the output current curve at twopoints. If this happens there are two stable output operat-ing points for the regulator. With this double intersectionUWUUthe power supply may need to be cycled down to zero andbrought up again to make the output RejectionFor the LT1086 the typical curves for ripple rejectionreflect values for a bypassed adjust pin. This curve will betrue for all values of output voltage. For proper bypassingand ripple rejection approaching the values shown, theimpedance of the adjust pin capacitor at the ripple fre-quency should equal the value of R1, (normally 100Ω to120Ω). The size of the required adjust pin capacitor is afunction of the input ripple frequency. At 120Hz the adjustpin capacitor should be 13µF if R1 = 100Ω; at 10kHz only0.16µF is circuits without an adjust pin bypass capacitor theripple rejection will be a function of output voltage. Theoutput ripple will increase directly as a ratio of the outputvoltage to the reference voltage (VOUT/VREF). For ex-ample, with the output voltage equal to 5V and no adjustpin capacitor, the output ripple will be higher by the ratioof 5V/1.25V or four times larger. Ripple rejection will bedegraded by 12dB from the value shown on the LT1086curve. Typical curves are provided for the 5V and 12Vdevices since the adjust pin is not VoltageThe LT1086 develops a 1.25V reference voltage betweenthe output and the adjust terminal (see Figure 1). Byplacing resistor R1 between these two terminals, a con-stant current is caused to flow through R1 and downthrough R2 to set the overall output voltage. Normally thiscurrent is chosen to be the specified minimum loadcurrent of 10mA. Because IADJ is very small and constantwhen compared with the current through R1, it repre-sents a small error and can usually be ignored. For fixedvoltage devices R1 and R2 are included in the T1086ADJIADJ50µAR2VOUT

= VREF 1 + + IADJ R2

R1OUTVREFR1VOUT10µFTANTALUM+( )R21086 • F01Figure 1. Basic Adjustable Regulator1086ff9

LT1086 SeriesAPPLICATIONS INFORMATIONLoad RegulationBecause the LT1086 is a 3-terminal device, it is notpossible to provide true remote load sensing. Load regu-lation will be limited by the resistance of the wire connect-ing the regulator to the load. The data sheet specificationfor load regulation is measured at the bottom of thepackage. Negative side sensing is a true Kelvin connec-tion, with the bottom of the output divider returned to thenegative side of the load. Although it may not be immedi-ately obvious, best load regulation is obtained when thetop of the resistor divider R1 is connected

directly to thecase

not to the load, as illustrated in Figure 2. If R1 wereconnected to the load, the effective resistance between theregulator and the load would be:RP

R2 + R1, RP = Parasitic Line ResistanceR1RPPARASITICLINE RESISTANCEVININLT1086ADJR1*RLR2*OUT()*CONNECT R1 TO CASE CONNECT R2 TO LOAD1086 • F02Figure 2. Connections for Best Load RegulationConnected as shown, RP is not multiplied by the dividerratio. RP is about 0.004Ω per foot using 16-gauge translates to 4mV/ft at 1A load current, so it isimportant to keep the positive lead between regulator andload as short as possible and use large wire or PC that the resistance of the package leads for the Hpackage ≈0.06Ω/inch. While it is usually not possible toconnect the load directly to the package, it is possible toconnect larger wire or PC traces close to the case to avoidvoltage drops that will degrade load fixed voltage devices the top of R1 is internally Kelvinconnected and the ground pin can be used for negativeside sensing.10UWUUThermal ConsiderationsThe LT1086 series of regulators have internal power andthermal limiting circuitry designed to protect the deviceunder overload conditions. For continuous normal loadconditions however, maximum junction temperature rat-ings must not be exceeded. It is important to give carefulconsideration to all sources of thermal resistance fromjunction to ambient. This includes junction-to-case, case-to-heat sink interface and heat sink resistance itself. Newthermal resistance specifications have been developed tomore accurately reflect device temperature and ensuresafe operating temperatures. The data section for thesenew regulators provides a separate thermal resistance andmaximum junction temperature for both the

Control Sec-tion and the

Power Transistor. Previous regulators, with asingle junction-to-case thermal resistance specification,used an average of the two values provided here andtherefore could allow excessive junction temperaturesunder certain conditions of ambient temperature and heatsink resistance. To avoid this possibility, calculationsshould be made for both sections to ensure that boththermal limits are example, using a LT1086CK (TO-3, Commercial) andassuming:VIN(max continuous) = 9V, VOUT = 5V, IOUT = 1A,TA = 75°C, θHEAT SINK = 3°C/W,θCASE-TO-HEAT SINK = 0.2°C/W for T package withthermal dissipation under these conditions is equal to:PD = (VIN – VOUT)(IOUT) = 4WJunction temperature will be equal to:TJ = TA + PD (θHEAT SINK + θCASE-TO-HEAT SINK + θJC)For the Control Section:TJ = 75°C + 4W(3°C/W + 0.2°C/W + 1.5°C/W) = 94.6°C95°C < 125°C = TJMAX (Control SectionCommercial Range)For the Power Transistor:TJ = 75°C + 4W(3°C/W + 0.2°C/W + 4°C/W) = 103.8°C103.8°C < 150°C = TJMAX (Power TransistorCommercial Range)1086ff

LT1086 SeriesAPPLICATIONS INFORMATIONIn both cases the junction temperature is below themaximum rating for the respective sections, ensuringreliable on-to-case thermal resistance for the K and T pack-ages is specified from the IC junction to the bottom of thecase directly below the die. This is the lowest resistancepath for heat flow. While this is also the lowest resistancepath for the H package, most available heat sinks for thispackage are of the clip-on type that attach to the cap of thepackage. The data sheet specification for thermal resis-tance for the H package is therefore written to reflect all cases proper mounting is required to ensure the bestpossible heat flow from the die to the heat sink. Thermalcompound at the case-to-heat sink interface is stronglyrecommended. In the case of the H package, mounting thedevice so that heat can flow out the bottom of the case willsignificantly lower thermal resistance (≈ a factor of 2). Ifthe case of the device must be electrically isolated, athermally conductive spacer can be used as long as itsadded contribution to thermal resistance is that the case of all devices in this series is electricallyconnected to the L APPLICATIONS5V, 1.5A RegulatorVIN

≥ 6.5V

IN+10µF*REQUIRED FOR STABILITY1N5817INLT1086-2.85OUTGND10µFTANTALUM4.25VTO 5.25V+UWUUULT1086ADJOUT121Ω1%5V AT 1.5A+10µF*TANTALUM365Ω1%LT1086 • AI02SCSI-2 Active TerminationTERMPWR110Ω2%110Ω+10µFTANTALUM0.1µFCERAMIC110Ω2%110Ω18 TOTAL110Ω2%110ΩLT1086 • TA031086ff11

LT1086 SeriesTYPICAL APPLICATIONS1.2V to 15V Adjustable RegulatorVININLT1086ADJC1*10µFOUTR1121ΩR25kVOUT†VIN+*NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORSR2†VOUT = 1.25V 1 +R1()Battery ChargerLT1086VININADJVOUT – 1.251 +R2R1 – RS1 +R2R1OUTIFRSVOUT1.25VR1R2LT1086 • TA06IF

=(())()(dIF=dVOUT)1 – RS1 +R2R1Regulator with ReferenceVIN

> 11.5V

+10µFINLT1086-5OUTGND5VLT1029VININ+10µFRETURN12U5V Regulator with ShutdownINLT1086ADJ10µF1kTTL1kLT1086 • TA05OUT121Ω1%5V++C2100µF+2N3904365Ω1%100µFLT1086 • TA04Adjusting Output Voltage of Fixed RegulatorsVIN

> 12V 5V TO 10V100µF+10µFINLT1086-5OUTGND++10µF*1kLT1086 • TA07*OPTIONAL IMPROVES RIPPLE REJECTIONProtected High Current Lamp Driver+10V100µFTTL ORCMOS10kLT1086 • TA08OUTLT1086ADJIN12V1A15VLT1086 • TA10Remote SensingRP(MAX DROP 300mV)LT1086ADJOUT100µF25Ω121Ω6184365Ω100pFVOUT5V21kRL5µF+VIN7–+LM301A3+25ΩRETURNLT1086 • TA091086ff

LT1086 SeriesTYPICAL APPLICATIONSHigh Efficiency Dual Linear SupplyL1285µHINHEAT SINK2N6667Q1DARLINGTONMBR36010k1k1000µF2.4k30kLT1004-2.5LT1086ADJ510kOUT124Ω*12V1.5A++MDA201+4700µF7–130VACTO 90VACSTANCORP-8685HEAT SINK2N6667Q2DARLINGTONMBR36010k1k++MDA201+4700µF7–*1% FILM RESISTORS MDA = MOTOROLA L1 = PULSE ENGINEERING, INC. #PE-92106VINSWITCHINGREGULATOR*1% FILM RESISTORSLT1086 • TA12U+20k*30.1k*1.07k*100µFD11N40028LT1011+–234L1285µHIN1000µF510k2.4k30k8LT10112LT1004-2.5LT1086ADJOUT124Ω*+20k*30.1k*1.07k*100µFD21N4002+–3–12V1.5A4LT1086 • TA11High Efficiency Dual SupplyFEEDBACK PATHMUR4105V OUTPUT(TYPICAL)+470µFMUR410INLT1086ADJ470µFOUT124Ω*12V1.5A++10µF+10µF1N40021.07k*MUR410INLT1086ADJ470µFOUT124Ω*++10µF+10µF1N4002–12V1.5A1086ff1.07k*13

LT1086 SeriesTYPICAL APPLICATIONSBattery Backed Up Regulated SupplyVININ10µFLT1086-5OUTGND50ΩSELECT FORCHARGE RATE5.2V LINE5V BATTERY++6.5V10µFINLT1086-5OUTGNDAutomatic Light ControlVININLT1086ADJ10µFOUT1.2k100µF+PACKAGE DESCRIPTIONH Package3-Lead TO-39 Metal Can(Reference LTC DWG # 05-08-1330)0.350 – 0.370(8.890 – 9.398)0.305 – 0.335(7.747 – 8.509)0.050(1.270)MAXREFERENCEPLANE0.165 – 0.185(4.191 – 4.699)*0.029 – 0.045(0.737 – 1.143)0.028 – 0.034(0.711 – 0.864) 0.016 – 0.021**(0.406 – 0.533)DIA

0.500

(12.700)MIN0.200(5.080)TYP0.100(2.540)14UUImproving Ripple RejectionVIN ≥ 6.5VINLT1086ADJ10µFOUTVOUT

= 5V+R1121Ω1%R2365Ω1%150µF+C110µF*LT1086 • TA14+100µFLT1086 • TA13*C1 IMPROVES RIPPLE REJECTION.

XC SHOULD BE ≈ R1 AT RIPPLE FREQUENCYLow Dropout Negative SupplyVININLT1086-12OUTGND+10,000µF+100µFVOUT = –12VLT1086 • TA15FLOATING INPUTLT1086 • TA16PIN 10.100(2.540)45°H3(TO-39) 1098OBSOLETE PACKAGE*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE

AND 0.045" BELOW THE REFERENCE PLANE0.016 – 0.024**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS(0.406 – 0.610)1086ff

LT1086 SeriesPACKAGE DESCRIPTIONK Package2-Lead TO-3 Metal Can(Reference LTC DWG # 05-08-1310)0.320 – 0.350(8.13 – 8.89)0.760 – 0.775(19.30 – 19.69)0.060 – 0.135(1.524 – 3.429)0.420 – 0.480(10.67 – 12.19)0.210 – 0.220(5.33 – 5.59)0.425 – 0.435(10.80 – 11.05)0.067 – 0.077(1.70 – 1.96)0.256(6.502)0.060(1.524)0.060(1.524)0.183(4.648)0.075(1.905)0.300(7.620)BOTTOM VIEW OF DD PAKHATCHED AREA IS SOLDER PLATEDCOPPER HEAT SINK+0.0120.143–0.020+0.3053.632–0.5080.090 – 0.110(2.286 – 2.794)0.050

(1.270)BSC0.013 – 0.023(0.330 – 0.584)Information furnished by Linear Technology Corporation is believed to be accurate and r, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.U0.038 – 0.043(0.965 – 1.09)1.177 – 1.197(29.90 – 30.40)0.655 – 0.675(16.64 – 17.15)0.151 – 0.161(3.86 – 4.09)DIA, 2PLCS0.167 – 0.177(4.24 – 4.49)R0.490 – 0.510(12.45 – 12.95)RK2 (TO-3) 1098OBSOLETE PACKAGEM Package3-Lead Plastic DD Pak(Reference LTC DWG # 05-08-1460)0.060(1.524)TYP0.390 – 0.415(9.906 – 10.541)15° TYP0.059(1.499)TYP0.165 – 0.180(4.191 – 4.572)0.045 – 0.055(1.143 – 1.397)+0.0080.004–0.0040.330 – 0.370(8.382 – 9.398)(+0.2030.102–0.102)0.095 – 0.115(2.413 – 2.921)0.050 ± 0.012(1.270 ± 0.305)()M (DD3) 10981086ff15

LT1086 SeriesPACKAGE DESCRIPTIONT Package3-Lead Plastic TO-220(Reference LTC DWG # 05-08-1420)0.390 – 0.415(9.906 – 10.541)0.147 – 0.155(3.734 – 3.937)DIA0.230 – 0.270(5.842 – 6.858)0.460 – 0.500(11.684 – 12.700)0.570 – 0.620(14.478 – 15.748)0.330 – 0.370(8.382 – 9.398)0.165 – 0.180(4.191 – 4.572)0.980 – 1.070(24.892 – 27.178)0.520 – 0.570(13.208 – 14.478)0.100(2.540)BSC0.028 – 0.038(0.711 – 0.965)RELATED PARTSPART NUMBERLT1129LT1528LT1585LT1761LT1762LT1763DESCRIPTION700mA, Micropower, LDO3A LDO for Microprocessor Applications4.6A LDO , with Fast Transient Response100mA, Low Noise Micropower, LDO150mA, Low Noise Micropower, LDO500mA, Low Noise Micropower, LDOCOMMENTSVIN = 4.2V to 30V, VOUT(MIN) = 3.75V, IQ = 50µA, ISD = 16µA,DD, SOT-223, S8, TO-220, TSSOP-20 PackagesVIN = 4V to 15V, VOUT(MIN) = 3.30V, IQ = 400µA, ISD = 125µA,Fast Transient Response, DD, TO-220 PackagesVIN = 2.5V to 7V, VOUT(MIN) = 1.25V, IQ = 8mA,Fast Transient Response, DD, TO-220 PackagesVIN = 1.8V to 20V, VOUT(MIN) = 1.22V, IQ = 20µA, ISD = <1µA,Low Noise < 20µVRMS P-P, Stable with 1µF Ceramic Capacitors, ThinSOTTM PackageVIN = 1.8V to 20V, VOUT(MIN) = 1.22V, IQ = 25µA, ISD = <1µA,Low Noise < 20µVRMS P-P, MSOP PackageVIN = 1.8V to 20V, VOUT(MIN) = 1.22V, IQ = 30µA, ISD = <1µA,Low Noise < 20µVRMS P-P, S8 PackageVIN = 2.7V to 20V, VOUT(MIN) = 1.21V, IQ = 1mA, ISD = <1µA, Low Noise< 40µVRMS P-P, “A” Version Stable with Ceramic Capacitor, DD, TO-220 PackagesVIN = 1.8V to 20V, VOUT(MIN) = 1.22V, IQ = 30µA, ISD = <1µA,Low Noise < 20µVRMS P-P, MS8 PackageVIN = 2.1V to 20V, VOUT(MIN) = 1.21V, IQ = 1mA, ISD = <1µA,Low Noise < 40µVRMS P-P,“A” Version Stable with Ceramic Capacitor,DD, TO-220, SOT-223, S8 PackagesVIN = –0.9V to –20V, VOUT(MIN) = –1.21V, IQ = 30µA, ISD = 3µA,Low Noise < 30µVRMS P-P, Stable with Ceramic Capacitors, ThinSOT Package1086ffLT1764/LT1764A3A, Low Noise, Fast Transient Response, LDOsLT1962300mA, Low Noise Micropower, LDOLT1963/LT1963A1.5A, Low Noise, Fast Transient Response, LDOsLT1964200mA, Low Noise Micropower, Negative LDOThinSOT is a trademark of Linear Technology Corporation.16Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417(408) 432-1900

q FAX: (408) 434-0507

0.045 – 0.055(1.143 – 1.397)0.218 – 0.252(5.537 – 6.401)0.013 – 0.023(0.330 – 0.584)0.050(1.270)TYP0.095 – 0.115(2.413 – 2.921)T3 (TO-220) 1098 LT/TP 0703 1K REV F • PRINTED IN USA© LINEAR TECHNOLOGY CORPORATION 1988

2024年2月16日发(作者：潮姮)

INPUT/OUTPUT

DIFFERENTIAL

(V)25V to 3.3V RegulatorINDICATES GUARANTEED TEST POINT–55°C ≤ TJ ≤ 150°C0°C ≤ TJ ≤ 125°CVIN

≥ 4.75V

LT1086 SeriesThe

= 25°Cq4.75V ≤ VIN ≤ 18V, IOUT = 0mA, TJ

= 25°C (Notes 2, 3)qVIN = 15V, 0 ≤ IOUT ≤ 1.5A,

= 25°C (Notes 2, 3)qqqLT1086/-2.85/-3.3/-3.6/-5/-12 ∆VOUT, ∆VREF = 1%, IOUT = 1.5A (Note 4)LT1086H∆VREF = 1%, IOUT = 0.5A (Note 4)1086ff3

LT1086 SeriesELECTRICAL CHARACTERISTICSPARAMETERCurrent LimitCONDITIONSThe

– VOUT) = 25VLT1086H(VIN – VOUT) = 5V(VIN

LT1086 SeriesTYPICAL PERFORMANCE CHARACTERISTICS

LT1086 Short-Circuit Current2.5OUTPUT

VOLTAGE

DEVIATION

(%)TJ = 150°CTJ = 25°CTJ = –55°C1.50.100.050–0.05–0.10–0.15–0.20–50–25MINIMUM

OPERATING

CURRENT

(mA)SHORT-CIRCUIT

CURRENT

(A)2.01.00.50GUARANTEEDOUTPUT CURRENTINPUT/OUTPUT DIFFERENTIAL (V)30Temperature Stability2OUTPUT

VOLTAGE

CHANGE

(%)ADJUST

CURRENT

(µA)1POWER

(W)0–1–2–50–255150TEMPERATURE (°C)LT1086 • TPC04LT1086 Ripple Rejection1009080RIPPLE

REJECTION

(dB)700101001k10kFREQUENCY (Hz)100kLT1086 • TPC07VRIPPLE ≤ 3VP-PVRIPPLE ≤ 0.5VP-PRIPPLE

REJECTION

(dB)(VIN – VOUT) ≥ 3V7000VOUT = 5VCADJ = 25µFCOUT = 25µF0.25fR = 20kHzVRIPPLE ≤ 0.5VP-PRIPPLE

REJECTION

LT1086 SeriesTYPICAL PERFORMANCE CHARACTERISTICS

LT1086-5 Ripple Rejectionvs Current1009080RIPPLE

REJECTION

(dB)7000VOUT = 5VCADJ = 25µFCOUT = 25µF0.251.250.751.00.5OUTPUT CURRENT (A)1.5fR = 20kHzVRIPPLE ≤ 0.5VP-PRIPPLE

REJECTION

(dB)fR = 120HzVRIPPLE ≤ 3VP-P(VIN – VOUT) ≥ 3VRIPPLE

REJECTION

(dB)LT1086 Line Transient Response600.3OUTPUT

VOLTAGEDEVIATION

(V)OUTPUT

VOLTAGEDEVIATION

(mV)40200–20–40–60VOUT = 10VIOUT = 0.2ACIN = 1µF TANTALUMCOUT = 10µF TANTALUMCADJ = 0CADJ = 1µF0.10–0.1–0.2–0.3CADJ = 1µFSHORT-CIRCUIT

CURRENT

(A)LOAD

CURRENT

(A)INPUT

VOLTAGEDEVIATION

(V)0TIME (µs)LT1086H Dropout VoltageMINIMUM

INPUT/OUTPUT

DIFFERENTIAL

(V)2INDICATES GUARANTEED TEST POINTOUTPUT

VOLTAGE

DEVIATION

(%)–55°C ≤ TJ ≤ 150°C0°C ≤ TJ ≤ 125°C1TJ = –55°CTJ = 25°CTJ = 150°CRIPPLE

REJECTION

LT1086 SeriesTYPICAL PERFORMANCE CHARACTERISTICS

LT1086H Ripple Rejection1009080RIPPLE

REJECTION

(dB)700101001k10kFREQUENCY (Hz)100kLT1086 • TPC19VRIPPLE ≤ 3VP-PVRIPPLE ≤ 0.5VP-P(VIN – VOUT) ≥ 3VPOWER

1086 • BDVOUT1086ff7

= VREF 1 + + IADJ R2

R1OUTVREFR1VOUT10µFTANTALUM+( )R21086 • F01Figure 1. Basic Adjustable Regulator1086ff9

directly to thecase

not to the load, as illustrated in Figure 2. If R1 wereconnected to the load, the effective resistance between theregulator and the load would be:RP

Control Sec-tion and the

≥ 6.5V

=(())()(dIF=dVOUT)1 – RS1 +R2R1Regulator with ReferenceVIN

> 11.5V

0.500

(12.700)MIN0.200(5.080)TYP0.100(2.540)14UUImproving Ripple RejectionVIN ≥ 6.5VINLT1086ADJ10µFOUTVOUT

= 5V+R1121Ω1%R2365Ω1%150µF+C110µF*LT1086 • TA14+100µFLT1086 • TA13*C1 IMPROVES RIPPLE REJECTION.

AND 0.045" BELOW THE REFERENCE PLANE0.016 – 0.024**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS(0.406 – 0.610)1086ff

q FAX: (408) 434-0507

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