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LT3080EST Datasheet(PDF) 10 Page - Linear Technology |
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LT3080EST Datasheet(HTML) 10 Page - Linear Technology |
10 / 26 page LT3080 10 3080fb available in higher values. Care still must be exercised when using X5R and X7R capacitors; the X5R and X7R codes only specify operating temperature range and maximum capacitance change over temperature. Capacitance change due to DC bias with X5R and X7R capacitors is better than Y5V and Z5U capacitors, but can still be significant enough to drop capacitor values below appropriate levels. Capaci- tor DC bias characteristics tend to improve as component case size increases, but expected capacitance at operating voltage should be verified. Voltage and temperature coefficients are not the only sources of problems. Some ceramic capacitors have a piezoelectric response. A piezoelectric device generates voltage across its terminals due to mechanical stress, similar to the way a piezoelectric microphone works. For a ceramic capacitor the stress can be induced by vibrations in the system or thermal transients. 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. PC trace resistance in milliohms/inch is shown in Table 1. Only a tiny area is needed for ballasting. Table 1. PC Board Trace Resistance WEIGHT (oz) 10 mil WIDTH 20 mil WIDTH 1 54.3 27.1 2 27.1 13.6 Trace resistance is measured in mOhms/in The worse case offset between the set pin and the output of only ± 2 millivolts allows very small ballast resistors to be used. As shown in Figure 4, the two devices have a small 10 milliohm ballast resistor, which at full output current gives better than 80 percent equalized sharing of the current. The external resistance of 10 milliohms + – LT3080 VIN VCONTROL OUT SET 10mΩ + – LT3080 VIN VIN 4.8V TO 28V VOUT 3.3V 2A VCONTROL OUT 10μF 1μF SET 165k 3080 F04 10mΩ Figure 4. Parallel Devices APPLICATIONS INFORMATION DC BIAS VOLTAGE (V) 3080 F02 20 0 –20 –40 –60 –80 –100 0 4 8 10 26 12 14 X5R Y5V 16 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10μF Figure 2. Ceramic Capacitor DC Bias Characteristics TEMPERATURE (°C) –50 40 20 0 –20 –40 –60 –80 –100 25 75 3080 F03 –25 0 50 100 125 Y5V X5R BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10μF Figure 3. Ceramic Capacitor Temperature Characteristics |
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