LT3092 – 200mA 2-Terminal Programmable Current …

1 LT309213092fcFor more information applicaTionDescripTion200mA 2-Terminal Programmable Current SourceThe LT 3092 is a Programmable 2-Terminal Current source. It requires only two resistors to set an output Current between and 200mA . A multitude of analog techniques lend themselves to actively programming the output Current . The LT3092 is stable without input and output capacitors, offering high DC and AC impedance. This feature allows operation in intrinsically safe applications. The SET pin features 1% initial accuracy and low tem-perature coefficient. Current regulation is better than 10ppm/V from to LT3092 can operate in a 2-Terminal Current source configuration in series with signal lines. It is ideal for driv-ing sensors, remote supplies, and as a precision Current limiter for local protection circuitry includes reverse-battery and reverse- Current protection, Current limiting and thermal limiting.

2 The LT3092 is offered in the 8-lead TSOT-23, 3-lead SOT-223 and 8-lead 3mm 3mm DFN 2-Terminal Current SourceFeaTuresapplicaTionsn Programmable 2-Terminal Current Sourcen Maximum Output Current : 200mA n Wide Input Voltage Range: to 40Vn Input/Output Capacitors Not Requiredn Resistor Ratio Sets Output Currentn Initial Set Pin Current Accuracy: 1%n Reverse-Voltage Protectionn Reverse- Current Protectionn < / V Line Regulation Typicaln Current Limit and Thermal Shutdown Protectionn Available in 8-Lead SOT-23, 3-Lead SOT-223 and 8-Lead 3mm 3mm DFN Packagesn 2-Terminal Floating Current Sourcen GND Referred Current Sourcen Variable Current Sourcen In-Line Limitern Intrinsic Safety CircuitsSET Pin Current vs Temperature3092 TA01aINSETOUT+ LT309210 AROUTRSETVIN VOUT = TO 40 VISOURCE=10 A RSETROUTTEMPERATURE ( C) PIN Current ( A) TA01bL, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation.

3 All other trademarks are the property of their respective more information conFiguraTionabsoluTe MaxiMuM raTingsIN Pin Voltage Relative to SET, OUT .. 40 VSET Pin Current (Note 6) .. 15mASET Pin Voltage (Relative to OUT, Note 6) .. 10 VOutput Short-Circuit Duration ..Indefinite(Note 1) All Voltages Relative to VOUTTOP VIEWDD PACKAGE8-LEAD (3mm 3mm) PLASTIC DFN567894321 OUTOUTNCSETININNCNC TJMAX = 125 C, JA = 28 C/W, JC = 10 C/W EXPOSED PAD (PIN 9) IS OUT, MUST BE SOLDERED TO OUT ON THE PCB. SEE THE APPLICATIONS INFORMATION VIEWTAB IS OUTINOUTSETST PACKAGE3-LEAD PLASTIC SOT-223 TJMAX = 125 C, JA = 24 C/W, JC = 15 C/W TAB IS OUT, MUST BE SOLDERED TO OUT ON THE PCB. SEE THE APPLICATIONS INFORMATION 1 OUT 2 OUT 3 OUT 48 IN7 IN6 NC5 SETTOP VIEWTS8 PACKAGE8-LEAD PLASTIC TSOT-23 TJMAX = 125 C, JA = 57 C/W, JC = 15 C/WOperating Junction Temperature Range (Notes 2, 8) E, I Grades .. 40 C to 125 C MP Grade.

4 55 C to 125 C Storage Temperature Range .. 65 C to 150 CLead Temperature (ST, TS8 Packages Only) Soldering, 10 sec ..300 C LT309233092fcFor more information inForMaTionLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT3092 EDD#PBFLT3092 EDD#TRPBFLFJD8-Lead (3mm 3mm) Plastic DFN 40 C to 125 CLT3092 IDD#PBFLT3092 IDD#TRPBFLFJD8-Lead (3mm 3mm) Plastic DFN 40 C to 125 CLT3092 EST#PBFLT3092 EST#TRPBF30923-Lead Plastic SOT-223 40 C to 125 CLT3092 IST#PBFLT3092 IST#TRPBF30923-Lead Plastic SOT-223 40 C to 125 CLT3092 MPST#PBFLT3092 MPST#TRPBF3092MP3-Lead Plastic SOT-223 55 C to 125 CLT3092 ETS8#PBFLT3092 ETS8#TRPBFLTFJW8-Lead Plastic SOT-23 40 C to 125 CLT3092 ITS8#PBFLT3092 ITS8#TRPBFLTFJW8-Lead Plastic SOT-23 40 C to 125 CLEAD BASED FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT3092 EDDLT3092 EDD#TRLFJD8-Lead (3mm 3mm) Plastic DFN 40 C to 125 CLT3092 IDDLT3092 IDD#TRLFJD8-Lead (3mm 3mm)

5 Plastic DFN 40 C to 125 CLT3092 ESTLT3092 EST#TR30923-Lead Plastic SOT-223 40 C to 125 CLT3092 ISTLT3092 IST#TR30923-Lead Plastic SOT-223 40 C to 125 CLT3092 MPSTLT3092 MPST#TR3092MP3-Lead Plastic SOT-223 55 C to 125 CLT3092 ETS8LT3092 ETS8#TRLTFJW8-Lead Plastic SOT-23 40 C to 125 CLT3092 ITS8LT3092 ITS8#TRLTFJW8-Lead Plastic SOT-23 40 C to 125 CConsult LTC Marketing for parts specified with wider operating temperature ranges. *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: Some packages are available in 500 unit reels through designated sales channels with #TRMPBF #orderinfoLT309243092fcFor more information characTerisTicsNote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. 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.

6 The LT3092E is tested and specified under pulse load conditions such that TJ @ TA. The LT3092E is 100% tested at TA = 25 C. Performance at 40 C and 125 C is assured by design, characterization, and correlation with statistical process controls. The LT3092I is guaranteed to meet all data sheet specifications over the full 40 C to 125 C operating junction temperature range. The LT3092MP is 100% tested and guaranteed over the 55 C to 125 C operating junction temperature 3: Minimum load Current is equivalent to the quiescent Current of the part. 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 Pin Current ISETVIN = 2V, ILOAD = 1mA 2V VIN 40V, 1mA ILOAD 200mA A AOffset Voltage (VOUT VSET) VOSVIN = 2V, ILOAD = 1mA VIN = 2V, ILOAD = 1mA l 2 42 4mV mVCurrent Regulation (Note 7) ISET VOS ILOAD = 1mA to 200mA ILOAD = 1mA to 200mA l 2nA mVLine Regulation ISET VOS VIN = 2V to 40V, ILOAD = 1mA VIN = 2V to 40V, ILOAD = mV/VMinimum Load Current (Note 3)2V VIN 40Vl300500 ADropout Voltage (Note 4)ILOAD = 10mA ILOAD = 200mAl VCurrent LimitVIN = 5V, VSET = 0V, VOUT = Current RMS Output Noise (Note 5)

7 10Hz f Rejectionf = 120Hz, VRIPPLE = , ILOAD = , CSET = F, COUT = F f = 10kHz f = 1 MHz90 75 20dB dB dBThermal Regulation ISET10ms W The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25 C. (Note 2)Note 4: For the LT3092 , dropout is specified as the minimum input-to-output voltage differential required supplying a given output Current . Note 5: Adding a small capacitor across the reference Current resistor lowers output noise. Adding this capacitor bypasses the resistor shot noise and reference Current noise (see the Applications Information section).Note 6: Diodes with series 1k resistors clamp the SET pin to the OUT pin. These diodes and resistors only carry Current under transient 7: Current regulation is Kelvin-sensed at the 8: This IC includes overtemperature protection that protects the device during momentary overload conditions.

8 Junction temperature exceeds the maximum operating junction temperature when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device more information ( C) 50 VOLTAGE (mV) G03 INPUT-TO-OUTPUT VOLTAGE (V)0 VOLTAGE (mV) G05 IOUT = 1mATEMPERATURE ( C) PIN Current ( A) 2525100125150 SET PIN Current DISTRIBUTION ( A) = 1326 VOS DISTRIBUTION (mV)23092 G04 101 2N = 1326 LOAD Current (mA)0 400 OFFSET VOLTAGE ( V) 350 250 200 150100 501003092 G06 300050 10050150200 Typical perForMance characTerisTicsOffset Voltage DistributionOffset VoltageOffset VoltageCurrent RegulationSET Pin CurrentSET Pin Current DistributionOffset Voltage (VOUT VSET)TEMPERATURE ( C) 50 80 CHANGE IN REFERENCE CURRENTWITH LOAD (nA) 70 50 40 3020 10050753092 G07 60010 20 2525100125150 IOUT = 1mA TO 200mAVIN VOUT = 3 VLT309263092fcFor more information ( C) 500 MINIMUM OUTPUT Current ( A)

9 200300400600050753092 G08100500 2525100125150TJ = 55 CTJ = 25 CTJ = 125 CLOAD Current (mA) VOLTAGE (VIN VOUT) (V)3092 G09 ILOAD = 200mAILOAD = 10mATEMPERATURE ( C) 50 VOLTAGE (VIN VOUT) (V)3092 G10 INPUT-TO-OUTPUT DIFFERENTIAL VOLTAGE (V)00 Current LIMIT (mA)100200300246810400501502503503092 G11TJ = 25 CTEMPERATURE ( C) 500 Current LIMIT (mA)50150200250500350050753092 G12100400450300 2525100125150 VIN = 7 VVOUT = 0 VTypical perForMance characTerisTicsCurrent LimitLine Transient ResponseLine Transient ResponseDropout VoltageDropout VoltageCurrent LimitMinimum Output CurrentTIME ( s)03092 G130 INPUT VOLTAGE (V)OUTPUT CURRENTDEVIATION (mA)820406046 Current SOURCECONFIGURATIONTIME ( s)103092 G140 INPUT VOLTAGE (V)OUTPUT CURRENTDEVIATION (mA)820406046 100 5510210308010050709010mA Current SOURCECONFIGURATIONLT309273092fcFor more information ( )0 OUTPUT VOLTAGE (mV)80070060050040030020010003092 G1720001000 VIN = 36 VVIN = 5 VSET PIN = 0 VVINVOUTRTESTFREQUENCY (Hz) CURRENTNOISE SPECTRAL DENSITY (pA/ Hz)10010k100k100101k3092 perForMance characTerisTicsResidual Output for Less Than Minimum Output CurrentOutput ImpedanceNoise Spectral DensityTurn-On ResponseTurn-On ResponseFREQUENCY (Hz)OUTPUT IMPEDANCE ( )1001k10k100k1M10M101001k100M10M1011G100 k10k1M3092 G18 ISOURCE = 100mAISOURCE = 10mAISOURCE = 1mAVRSET = 100mVTIME ( s)83092 G150 INPUT VOLTAGE (V)OUTPUTCURRENT (mA) Current SOURCECONFIGURATIONTIME ( s)83092 G160 INPUT VOLTAGE (V)OUTPUTCURRENT (mA)6102030240510150515405025354510mA Current SOURCECONFIGURATIONLT309283092fcFor more information FuncTions(DD/ST/TS8)IN (Pins 7, 8/Pin 3/Pins 7, 8): Input.

10 This pin supplies power to bias internal circuitry and supply output load Current . For the device to operate properly and regulate, the voltage on this pin must be to above the OUT pin (depending on output load Current see the dropout voltage specifications in the Electrical Characteristics table).NC (Pins 3, 5, 6/NA/Pins 1, 6): No Connection. These pins have no connection to internal circuitry and may be tied to IN, OUT, GND or (Pins 1, 2/Pin 2/Pins 2, 3, 4): Output. This is the power output of the device. The minimum Current source value to which the LT3092 can be set is or the device will not (Pin 4/Pin 1/Pin 5): Set. This pin is the error ampli-fier s noninverting input and also sets the operating bias point of the circuit. A fixed 10 A Current source flows out of this pin. Two resistors program IOUT as a function of the resistor ratio relative to 10 A. Output Current range is to the maximum rated 200mA Pad/Tab (Pin 9/Tab/NA): Output.