LT3082 LINER [Linear Technology], LT3082 Datasheet
LT3082
Available stocks
Related parts for LT3082
LT3082 Summary of contents
Page 1
... The LT3082 withstands reverse input voltages and reverse output-to-input voltages without reverse-current fl ow. A key feature of the LT3082 is the capability to supply a wide output voltage range. A precision “0” TC 10μA ref- erence current source drives a single resistor to program the output voltage to any level between zero and 38.5V. The LT3082 is stable with only 2.2μ ...
Page 2
... LT3082ITS8#PBF LT3082ITS8#TRPBF LEAD BASED FINISH TAPE AND REEL LT3082EDD LT3082EDD#TR LT3082IDD LT3082IDD#TR LT3082EST LT3082EST#TR LT3082IST LT3082IST#TR LT3082MPST LT3082MPST#TR LT3082ETS8 LT3082ETS8#TR LT3082ITS8 LT3082ITS8#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. ...
Page 3
... Pulse Note 4: For the LT3082, dropout is specifi 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 ...
Page 4
... LT3082 TYPICAL PERFORMANCE CHARACTERISTICS SET Pin Current 10.100 10.075 10.050 10.025 10.000 9.975 9.950 9.925 9.900 –50 100 125 150 – TEMPERATURE (°C) Offset Voltage Distribution N = 1326 –2 – DISTRIBUTION (mV) OS 3082 G04 Load Regulation 100 ΔI = 1mA TO 200mA ...
Page 5
... Turn-On Response 2.0 1.5 1.0 0 450 500 300 350 400 0 = 0.1μF C SET OUT = 10mA R LOAD SET 3082 G14 LT3082 Current Limit 400 350 300 250 200 150 100 INPUT-TO-OUTPUT DIFFERENTIAL VOLTAGE (V) 3082 G10 250 0 200 450 500 50 100 150 ...
Page 6
... LT3082 TYPICAL PERFORMANCE CHARACTERISTICS Residual Output for Less Than Minimum Load Current 800 SET PIN = 0V 700 OUT V = 36V IN 600 R TEST 500 400 300 200 100 0 0 1000 2000 R (Ω) TEST 3082 G16 Noise Spectral Density 10k 1k 100 100 ...
Page 7
... IN, OUT, GND or fl oated. OUT (Pins 1, 2/Pin 2/Pins 2, 3, 4): Output. This is the power output of the device. The LT3082 requires a 0.5mA minimum load current or the output will not regulate. BLOCK DIAGRAM SET (Pin 4/Pin 1/Pin 5): Set. This pin is the error ampli- fi ...
Page 8
... LT3082 APPLICATIONS INFORMATION Introduction The LT3082 regulator is easy to use and has all the pro- tection features expected in high performance regulators. Included are reverse-input, reverse-output and reverse input-to-output protection for sensitive circuitry and loads. Additional protection includes short-circuit protection and thermal shutdown with hysteresis. ...
Page 9
... Stability and Output Capacitance The LT3082 requires an output capacitor for stability designed to be stable with most low ESR capacitors (typically ceramic, tantalum or low ESR electrolytic). A minimum output capacitor of 2.2μF with an ESR of 0.5Ω or less is recommended to prevent oscillations. Larger ...
Page 10
... Low ESR, ceramic input bypass capacitors are acceptable for applications without long input leads. However, applica- tions connecting a power supply to an LT3082 circuit’s IN and GND pins with long input wires combined with a low ESR, ceramic input capacitors are prone to voltage spikes, reliability concerns and application-specifi ...
Page 11
... The worst-case room temperature offset, only ±2mV between the SET pin and the OUT pin, allows the use of very small ballast resistors. As shown in Figure 5, each LT3082 has a small 50mΩ ballast resistor, which at full output current gives better than 80% equalized sharing of the current. The external resistance of 50mΩ ...
Page 12
... Load Regulation The LT3082 is a fl oating device. No ground pin exists on the packages. Thus, the IC delivers all quiescent current and drive current to the load. Therefore not possible to provide true remote load sensing ...
Page 13
... Junction temperature equals: 20°C/W 20°C 24°C 50°C + (1.02W • 30°C/W) = 80.6°C J 29°C/W In this example, junction temperature is below the maxi- mum rating, ensuring reliable operation. LT3082 = (V – OUT OUT = 16.5 (15V + 10%) = 11.4V (12V – 5%) = (16.5 – 11.4V)(200mA) = 1.02W • θ TOTAL ...
Page 14
... IN, is less than 1mA (typically under 100μA), protecting the LT3082 and sensitive loads. Clamping diodes and 1k limiting resistors protect the LT3082’s SET pin relative to the OUT pin voltage. These protection components typically only carry current under transient overload conditions. These devices are sized to handle ± ...
Page 15
... C1 1N4148 1μF – SET C2 R1 0.01μF 332k Coincident Tracking LT3082 IN 10μA + – SET OUT R2 80.6k V OUT1 2.5V OUT 0.2A C2 4.7μF LT3082 V OUT 0.5V TO 10V V = 0.5V + 1mA • R OUT SET R2 499Ω OUT 4.7μF 3082 TA04 V OUT 3.3V OUT 0.2A C OUT 4.7μF 3082 TA05 LT3082 IN 10μA + – ...
Page 16
... BUZ11 10μA + 10μF – SET OUT + R SET 15μF 2MEG Ramp Generator LT3082 IN 10μA + 1μF – SET 1nF VN2222LL Reference Buffer LT3082 IN 10μA + – SET OUT INPUT V OUTPUT C2 4.7μF C1 GND 1μF * MINIMUM LOAD 0.5mA 20V OUT OUT 0. 10μA • R ...
Page 17
... ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE LT3082 R = 0.115 0.38 ± 0.10 TYP 5 8 ...
Page 18
... LT3082 PACKAGE DESCRIPTION (6.30 – 6.71) (2.90 – 3.15) .264 – .287 (6.70 – 7.30) .130 – .146 (3.30 – 3.71) .0905 (2.30) BSC .071 (1.80) MAX (0.60 – 0.84 Package 3-Lead Plastic SOT-223 (Reference LTC DWG # 05-08-1630) .248 – .264 .114 – .124 .059 MAX .033 – .041 (0.84 – 1.04) 10° – 16° ...
Page 19
... TS8 Package 8-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1637) 0.65 REF 1.22 REF 1.50 – 1.75 2.80 BSC 1.4 MIN (NOTE 4) 0.65 BSC 0.80 – 0.90 1.00 MAX 0.09 – 0.20 (NOTE 3) LT3082 2.90 BSC (NOTE 4) PIN ONE ID 0.22 – 0.36 8 PLCS (NOTE 3) 0.01 – 0.10 1.95 BSC TS8 TSOT-23 0802 3082f 19 ...
Page 20
... Low Dropout Linear Regulator LT3085 500mA, Parallelable, Low Noise, Low Dropout Linear Regulator ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 20 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● Active-Driven Regulator LT3082 10μA + – OUT SET R1, 100k V1 2.2μF ...