LT3083 - Adjustable 3A Single Resistor Low …

1 LT308313083faTYPICAL APPLICATIONDESCRIPTIONA djustable 3A Single Resistor Low Dropout RegulatorThe LT 3083 is a 3a low dropout linear regulator that can be paralleled to increase output current or spread heat on surface mounted boards. Architected as a precision current source and voltage follower, this new regulator finds use in many applications requiring high current, adjustability to zero, and no heat sink. The device also brings out the collector of the pass transistor to allow low dropout opera-tion down to 310mV when used with multiple key feature of the LT3083 is the capability to supply a wide output voltage range. By using a reference current through a Single Resistor , the output voltage is programmed to any level between zero and 23V (DD-PAK and TO-220 packages).

2 The LT3083 is stable with 10 F of capacitance on the output, and the IC is stable with small ceramic ca-pacitors that do not require additional ESR as is common with other protection circuitry includes current limiting and thermal limiting. The LT3083 is offered in the 16-lead TSSOP (with an exposed pad for better thermal character-istics), 12-lead 4mm 4mm DFN (also with an exposed pad), 5-lead TO-220, and 5-lead surface mount DD-PAK , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective to at 3A Supply (Using VCONTROL)FEATURESAPPLICATIONSn Outputs May be Paralleled for Higher Current and Heat Spreadingn Output Current: 3An Single Resistor Programs Output Voltagen 50 A Set Pin Current: 1% Initial Accuracyn Output Adjustable to 0Vn Low Output Noise: 40 VRMS (10Hz to 100kHz)n Wide Input Voltage Range: to 23V (DD-Pak and TO-220 Packages)n Low Dropout Voltage: 310mVn <1mV Load Regulationn < Line Regulationn Minimum Load Current.

3 1mAn Stable with Minimum 10 F Ceramic Capacitorn Current Limit with Foldback and Overtemperature Protectionn Available in 16-Lead TSSOP, 12-Lead 4mm 4mm DFN, 5-Lead TO-220 and 5-Lead Surface Mount DD-PAK Packagesn High Current All Surface Mount Supplyn High Efficiency Linear Regulatorn Post Regulator for Switching Suppliesn Low Parts Count Variable Voltage Supplyn Low Output Voltage Power SuppliesSet Pin Current Distribution49513083 PIN CURRENT DISTRIBUTION ( A)N = 10523083 TA01aVCONTROLOUTINLT3083 SETRMIN909 *10 F10 FVOUT = = F*OPTIONAL FOR MINIMUM 1mA LOAD REQUIREMENTLT308323083faABSOLUTE MAXIMUM RATINGSCONTROL Pin Voltage .. 28 VIN Pin Voltage (T5, Q Packages) ..18V, No Overload or Short-Circuit ..23V, Pin Voltage (DF, FE Packages).

4 8V, No Overload or Short-Circuit ..14V, SET Pin Current (Note 7) .. 25mA SET Pin Voltage (Relative to OUT) .. 10 V (Note 1) All Voltages Relative to VOUTTOP VIEW13 OUTDF PACKAGE12-LEAD (4mm 4mm) PLASTIC DFN1211891045321 ININININVCONTROLVCONTROLOUTOUTOUTOUTOUTS ET67 TJMAX = 125 C, JA = 37 C/W, JC = 8 C/W EXPOSED PAD (PIN 13) IS OUT, MUST BE SOLDERED TO PCBFE PACKAGE16-LEAD PLASTIC TSSOP12345678 TOP VIEW161514131211109 OUTOUTOUTOUTOUTOUTSETOUTOUTININININVCONT ROLVCONTROLOUT17 OUT TJMAX = 125 C, JA = 25 C/W, JC = 8 C/W EXPOSED PAD (PIN 17) IS OUT, MUST BE SOLDERED TO PCBQ PACKAGE5-LEAD PLASTIC DD-PAKTAB ISOUTFRONT VIEWINVCONTROLOUTSETNC54321 TJMAX = 125 C, JA = 15 C/W, JC = 3 C/WT PACKAGE5-LEAD PLASTIC TO-220 INVCONTROLOUTSETNCFRONT VIEW54321 TAB ISOUT TJMAX = 125 C, JA = 40 C/W, JC = 3 C/WPIN CONFIGURATIONO utput Short-Circuit Duration.

5 Indefinite Operating Junction Temperature Range (Notes 2, 10) E-, I-grades .. 40 C to 125 C MP-grade .. 55 C to 125 C Storage Temperature Range .. 65 C to 150 C Lead Temperature (Soldering, 10 sec) T, Q, FE Packages Only ..300 CLEAD FREE FINISH TAPE AND REEL PART MARKING*PACKAGE DESCRIPTION TEMPERATURE RANGE LT3083 EDF#PBFLT3083 EDF#TRPBF308312-Lead (4mm 4mm) Plastic DFN 40 C to 125 CLT3083 EFE#PBFLT3083 EFE#TRPBF3083FE16-Lead Plastic TSSOP 40 C to 125 CLT3083EQ#PBFLT3083EQ#TRPBFLT3083Q5-Lead Plastic DD-PAK 40 C to 125 CLT3083ET#PBFLT3083ET#TRPBFLT3083T5-Lead Plastic TO-220 40 C to 125 CLT3083 IDF#PBFLT3083 IDF#TRPBF308312-Lead (4mm 4mm) Plastic DFN 40 C to 125 CLT3083 IFE#PBFLT3083 IFE#TRPBF3083FE16-Lead Plastic TSSOP 40 C to 125 CORDER INFORMATIONLT308333083faORDER INFORMATIONLEAD FREE FINISH TAPE AND REEL PART MARKING*PACKAGE DESCRIPTION TEMPERATURE RANGE LT3083IQ#PBFLT3083IQ#TRPBFLT3083Q5-Lead Plastic DD-PAK 40 C to 125 CLT3083IT#PBFLT3083IT#TRPBFLT3083T5-Lead Plastic TO-220 40 C to 125 CLT3083 MPDF#PBFLT3083 MPDF#TRPBF308312-Lead (4mm 4mm)

6 Plastic DFN 55 C to 125 CLT3083 MPFE#PBFLT3083 MPFE#TRPBF3083FE16-Lead Plastic TSSOP 55 C to 125 CLT3083 MPQ#PBFLT3083 MPQ#TRPBFLT3083Q5-Lead Plastic DD-PAK 55 C to 125 CLT3083 MPT#PBFLT3083 MPT#TRPBFLT3083T5-Lead Plastic TO-220 55 C to 125 CLEAD BASED FINISH TAPE AND REEL PART MARKING*PACKAGE DESCRIPTION TEMPERATURE RANGE LT3083 EDF LT3083 EDF#TR308312-Lead (4mm 4mm) Plastic DFN 40 C to 125 CLT3083 EFELT3083 EFE#TR3083FE16-Lead Plastic TSSOP 40 C to 125 CLT3083 EQLT3083EQ#TRLT3083Q5-Lead Plastic DD-PAK 40 C to 125 CLT3083 ETLT3083ET#TRLT3083T5-Lead Plastic TO-220 40 C to 125 CLT3083 IDFLT3083 IDF#TR308312-Lead (4mm 4mm) Plastic DFN 40 C to 125 CLT3083 IFELT3083 IFE#TR3083FE16-Lead Plastic TSSOP 40 C to 125 CLT3083 IQLT3083IQ#TRLT3083Q5-Lead Plastic DD-PAK 40 C to 125 CLT3083 ITLT3083IT#TRLT3083T5-Lead Plastic TO-220 40 C to 125 CLT3083 MPDFLT3083 MPDF#TR308312-Lead (4mm 4mm) Plastic DFN 55 C to 125 CLT3083 MPFELT3083 MPFE#TR3083FE16-Lead Plastic TSSOP 55 C to 125 CLT3083 MPQLT3083 MPQ#TRLT3083Q5-Lead Plastic DD-PAK 55 C to 125 CLT3083 MPTLT3083 MPT#TRLT3083T5-Lead Plastic TO-220 55 C to 125 CConsult LTC Marketing for parts specified with wider operating temperature ranges.

7 *The temperature grade is identified by a label on the shipping more information on lead free part marking, go to: For more information on tape and reel specifications, go to: The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C (Note 2).ELECTRICAL CHARACTERISTICSPARAMETERCONDITIONSMINTYP MAXUNITSSET Pin Current ISETVIN = 1V, VCONTROL = 2V, ILOAD = 1mA, TJ = 25 C VIN 1V, VCONTROL 2V, 5mA ILOAD 3A (Note 9) 4950 51 A AOutput Offset Voltage (VOUT VSET) VOS VIN = 1V, VCONTROL = 2V, ILOAD = 1mADF, FE Packages l 3 40 03 4mV mVT, Q Packages l 4 60 04 6mV mVLoad Regulation (DF, FE Packages) ISET VOS ILOAD = 1mA to 3A ILOAD = 5mA to 3A (Note 8) l 10 1nA mVLoad Regulation (T, Q Packages) ISET VOS ILOAD = 1mA to 3A ILOAD = 5mA to 3A (Note 8) l 10 4nA mVLine Regulation (DF, FE Packages)

8 ISET VOS VIN = 1V to 14V, VCONTROL = 2V to 25V, ILOAD = 1mA VIN = 1V to 14V, VCONTROL = 2V to 25V, ILOAD = mV/VLine Regulation (T, Q Packages) ISET VOS VIN = 1V to 23V, VCONTROL = 2V to 25V, ILOAD = 1mA VIN = 1V to 23V, VCONTROL = 2V to 25V, ILOAD = mV/VMinimum Load Current (Notes 3, 9)VIN = 1V, VCONTROL = 2V VIN = 14V (DF/FE) or 23V (T/Q), VCONTROL = 25Vl l350500 1 A mALT308343083fa The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C (Note 2).ELECTRICAL CHARACTERISTICSNote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

9 Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: Unless otherwise specified, all voltages are with respect to VOUT. The LT3083 is tested and specified under pulse load conditions such that TJ TA. The LT3083E is 100% tested at TA = 25 C. Performance of the LT3083E over the full 40 C to 125 C operating junction temperature range is assured by design, characterization, and correlation with statistical process controls. The LT3083I regulators are guaranteed over the full 40 C to 125 C operating junction temperature range. The LT3083MP is 100% tested and guaranteed over the 55 C to 125 C operating junction temperature range. Note 3: Minimum load current is equivalent to the quiescent current of the part.

10 Since all quiescent and drive current is delivered to the output of the part, the minimum load current is the minimum current required to maintain regulation. Note 4: For the LT3083 , dropout is caused by either minimum control voltage (VCONTROL) or minimum input voltage (VIN). Both parameters are specified with respect to the output voltage. The specifications represent the minimum input-to-output differential voltage required to maintain regulation. Note 5: The VCONTROL pin current is the drive current required for the output transistor. This current will track output current with roughly a 1:60 ratio. The minimum value is equal to the quiescent current of the device. Note 6: Output noise is lowered by adding a small capacitor across the voltage setting Resistor .