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LT1965 Series1.1A, Low Noise,Low Dropout Linear t Current: 1.1ADropout Voltage: 310mVLow Noise: 40µVRMS (10Hz to 100kHz)500µA Quiescent Current (Adjustable Version)Wide Input Voltage Range: 1.8V to 20VNo Protection Diodes NeededControlled Quiescent Current in DropoutAdjustable Output from 1.20V to 19.5VFixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V 1µA Quiescent Current in ShutdownStable with 10µF Output CapacitorStable with Ceramic or Tantalum CapacitorsReverse-Battery ProtectionNo Reverse CurrentCurrent Limit with Foldback ProtectionThermal Limiting5-Lead TO-220, DD-Pak, Thermally Enhanced 8-LeadMSOP and 8-Lead 3mm 3mm DFN PackagesApplicationsnnnThe LT 1965 series are low noise, low dropout linear regulators. The devices supply 1.1A of output current with a310mV typical dropout voltage. Operating quiescent currentis 500µA for the adjustable version, reducing to 1µA inshutdown. Quiescent current is well controlled; it does notrise in dropout as with many other regulators. The LT1965regulators have very low output noise which makes themideal for sensitive RF and DSP supply applications.Output voltage ranges from 1.20V to 19.5V. The LT1965regulators are stable with output capacitors as low as10µF. Internal protection circuitry includes reverse-batteryprotection, current limiting with foldback, thermal limiting and reverse-current protection. The LT1965 seriesare available in fixed output voltages of 1.5V, 1.8V, 2.5V,3.3V, and as an adjustable device with a 1.20V referencevoltage. The package offerings include the 5-lead TO-220,5-lead DD-Pak as well as the thermally enhanced 8-leadMSOP and low profile (0.75mm) 8-lead 3mm 3mm DFN.L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks andThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the propertyof their respective owners.Logic Power SuppliesPost Regulator for Switching SuppliesLow Noise InstrumentationTypical ApplicationDropout Voltage4003.3V to 2.5V RegulatorTJ 25 CVIN 3VTO 20V IN10µF*OUTLT1965-2.5SHDN 2.5V1.1A10µF*SENSEGND*CERAMIC OR TANTALUM1965 TA01DROPOUT VOLTAGE (mV)35030025020015010050000.20.60.80.4OUTPUT CURRENT (A)11.21965 TA01b1965fbFor more information www.linear.com/LT19651
LT1965 SeriesAbsolute Maximum Ratings(Note 1)IN Pin Voltage. 22VOUT Pin Voltage. 22VInput to Output Differential Voltage (Note 2) . 22VSENSE Pin Voltage. 22VADJ Pin Voltage. 9VSHDN Pin Voltage. 22VOutput Short-Circuit Duration. IndefiniteOperating Junction Temperature Range (Notes 3, 5, 13)E-, I-Grades. –40 C to 125 CH-Grade. –40 C to 150 CStorage Temperature Range. –65 C to 150 CLead Temperature (Soldering, 10 sec)(Only for MSOP, TO-220, DD-Pak Packages). 300 CPin ConfigurationTOP VIEWOUT 1OUT 2SENSE/ADJ* 39GND 48IN7IN6SHDN5GNDTOP VIEWOUTOUTSENSE/ADJ*GND1234ININSHDNGNDMS8E PACKAGE8-LEAD PLASTIC MSOPDD PACKAGE8-LEAD (3mm 3mm) PLASTIC DFNTJMAX 150 C, θJA 65 C/W, θJC 3 C/WEXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB*PIN 3 SENSE FOR LT1965-1.5/LT1965-1.8/LT1965-2.5/LT1965-3.3*PIN 3 ADJ FOR LT1965TJMAX 125 C, θJA 60 C/W, θJC 10 C/WEXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB*PIN 3 SENSE FOR LT1965-1.5/LT1965-1.8/LT1965-2.5/LT1965-3.3*PIN 3 ADJ FOR LT1965FRONT VIEWTAB ISGND87659FRONT VIEW5SENSE/ADJ*4OUT3GND2IN1SHDNTAB ISGNDQ PACKAGE5-LEAD PLASTIC DD-PAK5SENSE/ADJ*4OUT3GND2IN1SHDNT PACKAGE5-LEAD PLASTIC TO-220TJMAX 150 C, θJA 30 C/W, θJC 3 C/W*PIN 5 SENSE FOR LT1965-1.5/LT1965-1.8/LT1965-2.5/LT1965-3.3*PIN 5 ADJ FOR LT1965TJMAX 150 C, θJA 50 C/W, θJC 3 C/W*PIN 5 SENSE FOR LT1965-1.5/LT1965-1.8/LT1965-2.5/LT1965-3.3*PIN 5 ADJ FOR LT1965Order InformationLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT1965EDD#PBFLT1965EDD#TRPBFLCXW8-Lead (3mm 3mm) Plastic DFN–40 C to 125 CLT1965IDD#PBFLT1965IDD#TRPBFLCXW8-Lead (3mm 3mm) Plastic DFN–40 C to 125 CLT1965EDD-1.5#PBFLT1965EDD-1.5#TRPBFLDKW8-Lead (3mm 3mm) Plastic DFN–40 C to 125 CLT1965IDD-1.5#PBFLT1965IDD-1.5#TRPBFLDKW8-Lead (3mm 3mm) Plastic DFN–40 C to 125 CLT1965EDD-1.8#PBFLT1965EDD-1.8#TRPBFLDKY8-Lead (3mm 3mm) Plastic DFN–40 C to 125 CLT1965IDD-1.8#PBFLT1965IDD-1.8#TRPBFLDKY8-Lead (3mm 3mm) Plastic DFN–40 C to 125 CLT1965EDD-2.5#PBFLT1965EDD-2.5#TRPBFLDMB8-Lead (3mm 3mm) Plastic DFN–40 C to 125 CLT1965IDD-2.5#PBFLT1965IDD-2.5#TRPBFLDMB8-Lead (3mm 3mm) Plastic DFN–40 C to 125 CLT1965EDD-3.3#PBFLT1965EDD-3.3#TRPBFLDMD8-Lead (3mm 3mm) Plastic DFN–40 C to 125 C21965fbFor more information www.linear.com/LT1965
LT1965 Seriesorder informationLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE d (3mm 3mm) Plastic DFN–40 C to 125 CLT1965EMS8E#PBFLT1965EMS8E#TRPBFLTCXX8-Lead Plastic MSOP–40 C to 125 CLT1965IMS8E#PBFLT1965IMS8E#TRPBFLTCXX8-Lead Plastic MSOP–40 C to 125 ad Plastic MSOP–40 C to 125 ad Plastic MSOP–40 C to 125 ad Plastic MSOP–40 C to 125 ad Plastic MSOP–40 C to 125 ad Plastic MSOP–40 C to 125 ad Plastic MSOP–40 C to 125 ad Plastic MSOP–40 C to 125 ad Plastic MSOP–40 C to 125 CLT1965EQ#PBFLT1965EQ#TRPBFLT1965Q5-Lead Plastic DD-Pak–40 C to 125 CLT1965IQ#PBFLT1965IQ#TRPBFLT1965Q5-Lead Plastic DD-Pak–40 C to 125 CLT1965HQ#PBFLT1965HQ#TRPBFLT1965Q5-Lead Plastic DD-Pak–40 C to 150 ad Plastic DD-Pak–40 C to 125 ad Plastic DD-Pak–40 C to 125 ad Plastic DD-Pak–40 C to 125 ad Plastic DD-Pak–40 C to 125 ad Plastic DD-Pak–40 C to 125 ad Plastic DD-Pak–40 C to 125 ad Plastic DD-Pak–40 C to 125 ad Plastic DD-Pak–40 C to 125 CLT1965ET#PBFN/ALT1965T5-Lead Plastic TO-220–40 C to 125 CLT1965IT#PBFN/ALT1965T5-Lead Plastic TO-220–40 C to 125 CLT1965HT#PBFN/ALT1965T5-Lead Plastic TO-220–40 C to 150 CLT1965ET-1.5#PBFN/ALT1965T-1.55-Lead Plastic TO-220–40 C to 125 CLT1965IT-1.5#PBFN/ALT1965T-1.55-Lead Plastic TO-220–40 C to 125 CLT1965ET-1.8#PBFN/ALT1965T-1.85-Lead Plastic TO-220–40 C to 125 CLT1965IT-1.8#PBFN/ALT1965T-1.85-Lead Plastic TO-220–40 C to 125 CLT1965ET-2.5#PBFN/ALT1965T-2.55-Lead Plastic TO-220–40 C to 125 CLT1965IT-2.5#PBFN/ALT1965T-2.55-Lead Plastic TO-220–40 C to 125 CLT1965ET-3.3#PBFN/ALT1965T-3.35-Lead Plastic TO-220–40 C to 125 CLT1965IT-3.3#PBFN/ALT1965T-3.35-Lead Plastic TO-220–40 C to 125 CConsult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container.Consult LTC Marketing for information on nonstandard lead based finish parts.For more information on lead free part marking, go to: http://www.linear.com/leadfree/For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/1965fbFor more information www.linear.com/LT19653
LT1965 SeriesElectrical CharacteristicsThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA 25 C. (Note 3)PARAMETERCONDITIONSMINMinimum Input Voltage(Notes 4, 12)ILOAD 0.5AILOAD 1.1A (TJ 125 C)ILOAD 1A (H-Grade, TJ 125 C)Regulated Output Voltage(Note 5)LT1965-1.5, VIN 2.1V, ILOAD 1mALT1965-1.5, 2.5 VIN 20V, 1mA ILOAD 1.1Al1.4771.455LT1965-1.8, VIN 2.3V, ILOAD 1mALT1965-1.8, 2.8 VIN 20V, 1mA ILOAD 1.1AlLT1965-2.5, VIN 3V, ILOAD 1mALT1965-2.5, 3.5 VIN 20V, 1mA ILOAD 1.1ALT1965-3.3, VIN 3.8V, ILOAD 1mALT1965-3.3, 4.3 VIN 20V, 1mA ILOAD LT1965-1.5, VIN 2.1V to 20V, ILOAD 1mALT1965-1.8, VIN 2.3V to 20V, ILOAD 1mALT1965-2.5, VIN 3V to 20V, ILOAD 1mALT1965-3.3, VIN 3.8V to 20V, ILOAD 1mALT1965, VIN 2.1V to 20V, ILOAD 1mA (E-, I-Grades) (Note 4)LT1965, VIN 2.1V to 20V, ILOAD 1mA (H-Grade) (Note 4)llllllLoad RegulationLT1965-1.5, VIN 2.5V, ILOAD 1mA to 1.1ALT1965-1.5, VIN 2.5V, ILOAD 1mA to 1.1AlLT1965-1.8, VIN 2.8V, ILOAD 1mA to 1.1ALT1965-1.8, VIN 2.8V, ILOAD 1mA to 1.1AlLT1965-2.5, VIN 3.5V, ILOAD 1mA to 1.1ALT1965-2.5, VIN 3.5V, ILOAD 1mA to 1.1AlLT1965-3.3, VIN 4.3V, ILOAD 1mA to 1.1ALT1965-3.3, VIN 4.3V, ILOAD 1mA to 1.1AllILOAD 1mAILOAD 1mAlILOAD 100mAILOAD 100mAlILOAD 500mAILOAD 500mAlILOAD 1.1AILOAD 1.1A (TJ 125 C)ILOAD 1A (H-Grade, TJ 125 C)GND Pin CurrentVIN VOUT(NOMINAL) 1V(Notes 6, 8)ILOAD 0mAILOAD 1mAILOAD 100mAILOAD 500mAILOAD 1.1A (TJ 125 C)ILOAD 1A (H-Grade, TJ 125 C)Output Voltage NoiseCOUT 10µF, ILOAD 1.1A, BW 10Hz to 100kHzllllll40ADJ Pin Bias Current(Notes 4, 9)Shutdown Threshold4VOUT Off to OnVOUT On to OffUNITSVVVLine RegulationDropout VoltageVIN VOUT(NOMINAL)(Notes 6, 7, 12)MAX2.32.3lLT1965, VIN 2.3V, ILOAD 1mA to 1.1A (Note 4)LT1965, VIN 2.3V, ILOAD 1mA to 1.1A (TJ 125 C)LT1965, VIN 2.3V, ILOAD 1mA to 1A (H-Grade, TJ 125 C)1.651.8lVIN 2.1V, ILOAD 1mA2.3V VIN 20V, 1mA ILOAD 1.1A (TJ 125 C)2.3V VIN 20V, 1mA ILOAD 1A (H-Grade, TJ 125 C)ADJ Pin Voltage (Notes 4, 5)TYPll0.2µVRMS1.34.5µA0.850.452VV1965fbFor more information www.linear.com/LT1965
LT1965 SeriesElectrical CharacteristicsThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA 25 C. (Note 3)PARAMETERCONDITIONSSHDN Pin Current (Note 10)VSHDN 0VVSHDN 20VQuiescent Current in ShutdownVIN 6V, VSHDN 0VRipple RejectionVIN – VOUT 1.5V (AVG), VRIPPLE 0.5VP-P,fRIPPLE 120Hz, ILOAD 0.75ACurrent LimitVIN 7V, VOUT 0VIN VOUT(NOMINAL) 1V, VOUT –0.1V (TJ 125 C) (Note 6)VIN VOUT(NOMINAL) 1V, VOUT –0.1V, (H-Grade, TJ 125 C) (Note 6)Input Reverse-Leakage CurrentMIN57l1.21.1TYPMAX0.015.51100.011Note 1: Stresses beyond those listed under Absolute Maximum Ratingsmay cause permanent damage to the device. Exposure to any AbsoluteMaximum Rating condition for extended periods may affect devicereliability and lifetime.Note 2: Absolute maximum input to output differential voltage is notachievable with all combinations of rated IN pin and OUT pin voltages.With the IN pin at 22V, the OUT pin may not be pulled below 0V. The totalmeasured voltage from IN to OUT must not exceed 22V.Note 3: The LT1965 regulators are tested and specified under pulseload conditions such that TJ @ TA. The LT1965E regulators are 100%tested at TA 25 C and performance is guaranteed from 0 C to 125 C.Performance of the LT1965E over the full –40 C to 125 C operatingjunction temperature range is assured by design, characterization andcorrelation with statistical process controls. The LT1965I regulators areguaranteed over the full –40 C to 125 C operating junction temperaturerange. The LT1965H is tested at 150 C operating junction temperature.High junction temperatures degrade operating lifetimes. Operating lifetimeis derated at junction temperatures greater than 125 C.Note 4: The LT1965 adjustable version is tested and specified for theseconditions with the ADJ connected to the OUT pin.Note 5: Maximum junction temperature limits operating conditions. Theregulated output voltage specification does not apply for all possiblecombinations of input voltage and output current. Limit the output currentrange if operating at the maximum input voltage. Limit the input-to-outputvoltage differential if operating at the maximum output current.µAµAµA75dB2.4AAAVIN –20V, VOUT 0Reverse-Output Current (Note 11) LT1965-1.5, VOUT 1.5V, VIN 0LT1965-1.8, VOUT 1.8V, VIN 0LT1965-2.5, VOUT 2.5V, VIN 0LT1965-3.3, VOUT 3.3V, VIN 0LT1965 (Note 4), VOUT 1.2V, VIN AµANote 6: To satisfy minimum input voltage requirements, the LT1965adjustable version is tested and specified for these conditions with anexternal resistor divider (bottom 4.02k, top 4.32k) for an output voltage of2.5V. The external resistor divider adds 300µA of output DC load current.This external current is not factored into GND pin current.Note 7: Dropout voltage is the minimum input-to-output voltagedifferential needed to maintain regulation at a specified output current. Indropout, the output voltage equals: (VIN – VDROPOUT)Note 8: GND pin current is tested with VIN VOUT(NOMINAL) 1V and acurrent source load. GND pin current increases slightly in dropout. Forthe fixed output versions, an internal resistor divider will typically add100µA to the GND pin current. See GND pin current curves in the TypicalPerformance Characteristics section.Note 9: ADJ pin bias cur
1.1A, Low Noise, Low Dropout Linear Regulator The LT 1965 series are low noise, low dropout linear regu-lators. The devices supply 1.1A of output current with a 310mVtypicaldropoutvoltage. Operatingquiescentcurrent is 500µA for the adjustable version, reducing to 1µA in shutdown. Quiescent current is well controlled; it does not rise in dropout as with many other regulators. The LT1965 .
