lt3080 Linear Technology Corporation, lt3080 Datasheet
lt3080
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lt3080 Summary of contents
Page 1
... A key feature of the LT3080 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 36V. The LT3080 is stable with 2.2μ ...
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... LEAD BASED FINISH TAPE AND REEL LT3080EDD LT3080EDD#TR LT3080EMS8E LT3080EMS8E#TR LT3080ET LT3080ET#TR LT3080EST LT3080EST#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ...
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... Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Unless otherwise specifi ed, all voltages are with respect to V The LT3080 is tested and specifi ed under pulse load conditions such that T ≈ The LT3080 is 100% tested 25° ...
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... LT3080 W U TYPICAL PERFOR A CE CHARACTERISTICS Set Pin Current 10.20 10.15 10.10 10.05 10.00 9.95 9.90 9.85 9.80 –50 – 100 125 150 TEMPERATURE (°C) 3080 G01 Offset Voltage Distribution N = 13250 –2 – DISTRIBUTION (mV) OS 3080 G04 Load Regulation 0 ΔI = 1mA TO 1.1A LOAD V – –0.1 IN OUT CHANGE IN REFERENCE CURRENT – ...
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... I = 10mA LOAD 2.2μF OUT CERAMIC 0.1μF SET CERAMIC 100 TIME (μs) 3080 G17 LT3080 Dropout Voltage (Minimum V Pin Voltage) CONTROL 1 1.1A LOAD 1.4 1.2 1 1mA LOAD 0.8 0.6 0.4 0.2 0 –50 – 100 125 150 TEMPERATURE (°C) ...
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... LT3080 W U TYPICAL PERFOR A CE CHARACTERISTICS V Pin Currrent CONTROL 1.1A 20 LOAD DEVICE IN CURRENT LIMIT 1mA LOAD 36* INPUT-TO-OUTPUT DIFFERENTIAL (V) *SEE NOTE 9 IN ELECTRICAL 3080 G18 CHARACTERISTICS TABLE Ripple Rejection - Single Supply 100 CONTROL ...
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... Dropout specifi cations). IN (Pins 7, 8/Pins 7, 8/Pin 5/Pin 3): This is the collector to the power device of the LT3080. The output load current is supplied through this pin. For the device to regulate, the voltage at this pin must be more than 0.1V to 0.5V greater than the output voltage (see Dropout specifi ...
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... BLOCK DIAGRA U U APPLICATIO S I FOR ATIO The LT3080 regulator is easy to use and has all the pro- tection features expected in high performance regulators. Included are short-circuit protection and safe operating area protection, as well as thermal shutdown. The LT3080 is especially well suited to applications needing multiple rails ...
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... SET Figure 1. Basic Adjustable Regulator Output Voltage The LT3080 generates a 10μA reference current that fl ows out of the SET pin. Connecting a resistor from SET to ground generates a voltage that becomes the reference point for the error amplifi er (see Figure 1). The reference voltage is a straight multiplication of the SET pin current and the value of the resistor ...
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... Paralleling Devices LT3080’s may be paralleled to obtain higher output current. The SET pins are tied together and the IN pins are tied together. This is the same whether it’s in three terminal mode or has separate input supplies. The outputs are connected in common using a small piece of PC trace as a ballast resistor to equalize the currents ...
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... Even with an output voltage as low as 1V, this only adds 1% to the regulation. Of course, more than two LT3080’s can be paralleled for even higher output current. They are spread out on the PC board, spreading the heat. Input resistors can further spread the heat if the input-to-output difference is high ...
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... Load Regulation Because the LT3080 is a fl oating device (there is no ground pin on the part, all quiescent and drive current is delivered to the load not possible to provide true remote load sensing ...
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... Kelvin connection, with the bottom of the voltage setting resistor returned to the negative side of the load (see Figure 7). Connected as shown, system load regula- tion will be the sum of the LT3080 load regulation and the parasitic line resistance multiplied by the output current important to keep the positive connection between the regulator and load as short as possible and use large wire or PC board traces ...
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... V IN Power dissipation in the LT3080 now equals ʹ TOTAL The LT3080’s power dissipation is now only 30% compared to no series resistor. R OUT V OUT appropriate wattage resistors to handle and dissipate the C2 power properly. 3080 F08 + P • θ (approximated using tables) ...
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... OUT(MAX) sipate the power properly. With this confi guration, the carries no more P LT3080 supplies only 0.36A. Therefore, load current can increase by 0.64A to 1.64A while keeping the LT3080 in its normal operating range CONTROL LT3080 IN + – ...
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... OUT 1Ω SET 100k Low Dropout Voltage LED Driver V C1 CONTROL D1 LT3080 IN + – OUT SET R1 24.9k Adding Shutdown IN LT3080 CONTROL + – SET 3080 TA04 Q1 R1 VN2222LL SHUTDOWN * Q2 INSURES ZERO OUTPUT IN THE ABSENCE OF ANY OUTPUT LOAD. I OUT 4.7μF 3080 TA03 ...
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... SET C2 R1 0.01μF 332k Coincident Tracking V CONTROL LT3080 IN V CONTROL + – OUT SET R2 80.6k V OUT1 OUT 2. 4.7μF LT3080 V OUT 0.5V TO 10V V = 0.5V + 1mA • R OUT SET C OUT 4.7μF V OUT OUT 3. OUT 4.7μF 3080 TA07 IN LT3080 + – OUT V OUT3 5V SET 4.7μ ...
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... V CONTROL + 10μF – SET + 4.7μF R SET 15μF 2MEG Ramp Generator IN LT3080 V CONTROL + 1μF – OUT SET VN2222LL 1μF LT3080 + – OUT V OUT 0V TO 10V + SET 4.7μF 100μF R4 1MEG 3080 TA09 V OUT OUT 20V OUT V = 10μA • R OUT SET ...
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... U TYPICAL APPLICATIO S 5V 10μF *4mV DROP ENSURES LT3080 IS OFF WITH NO LOAD MULTIPLE LT3080’S CAN BE USED Reference Buffer IN LT3080 CONTROL + – OUT INPUT SET OUTPUT LT1019 C1 GND 1μF Ground Clamp IN LT3080 CONTROL + – OUT 1μF 1N4148 5k 3080 TA13 Boosting Fixed Output Regulators ...
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... Low Voltage, High Current Adjustable High Effi ciency Regulator † 2. 2× LTC3414 2.2MEG 100k 100μF PGOOD RUN/SS 1000pF SYNC/MODE SGND *DIFFERENTIAL VOLTAGE ON LT3080 IS 0.6V SET BY THE V † MAXIMUM OUTPUT VOLTAGE IS 1.5V BELOW INPUT VOLTAGE 20 0.47μ 2× I 100μF TH 12.1k 470pF R T 2N3906 ...
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... TYPICAL APPLICATIO S CMDSH-4E † 4.5V TO 25V V IN 10μF 1μF LT3493 100k SHDN 0.1μF *DIFFERENTIAL VOLTAGE ON LT3080 ≈ 1.4V SET BY THE TPO610L P-CHANNEL THRESHOLD. † MAXIMUM OUTPUT VOLTAGE IS 2V BELOW INPUT VOLTAGE Adjustable High Effi ciency Regulator* BOOST 0.1μF 10μH SW 68μF MBRM140 TP0610L ...
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... LT3080 PACKAGE DESCRIPTIO 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH ...
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... MAX .024 – .033 .012 (0.60 – 0.84) (0.31) MIN .181 (4.60) BSC LT3080 .165 – .180 (4.191 – 4.572) .045 – .055 (1.143 – 1.397) .620 (15.75) TYP .700 – .728 (17.78 – 18.491) .095 – .115 (2.413 – 2.921) .155 – .195* (3.937 – ...
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... FAX: (408) 434-0507 ● Paralleling Regulators IN LT3080 V CONTROL + – OUT 20mΩ SET IN LT3080 V CONTROL + – OUT 20mΩ 1μF SET 165k COMMENTS Fixed 2.85V, 3.3V, 3.6V, 5V and 12V Output 1V Dropout, Adjustable or Fixed Output, DD-Pak, SOT-223 Packages OK for Sinking and Sourcing, S0-8 and SOT-223 Packages 340mV Dropout Voltage, Low Noise: 40μ ...