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LT3085EDCB-TR Datasheet(PDF) 11 Page - Linear Technology |
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LT3085EDCB-TR Datasheet(HTML) 11 Page - Linear Technology |
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11 / 28 page  LT3085 11 3085fb APPLICATIONS INFORMATION DC BIAS VOLTAGE (V) 3085 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 3085 F03 –25 0 50 100 125 Y5V X5R BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10μF Figure 3. Ceramic Capacitor Temperature Characteristics in a small package, but they tend to have strong voltage and temperature coefficients as shown in Figures 2 and 3. When used with a 5V regulator, a 16V 10μF Y5V capacitor can exhibit an effective value as low as 1μF to 2μF for the DC bias voltage applied and over the operating temperature range. The X5R and X7R dielectrics result in more stable characteristics and are more suitable for use as the output capacitor. The X7R type has better stability across temperature, while the X5R is less expensive and is 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. Capacitor 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, ceramic capacitor the stress can be induced by vibrations in the system or thermal transients. Paralleling Devices LT3085’s may be paralleled with other LT308X devices 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 mΩ/in |
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