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LT3010EMS8E-5 Datasheet(PDF) 9 Page - Linear Technology |
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LT3010EMS8E-5 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LT3010/LT3010-5 3010f Extra consideration must be given to the use of ceramic capacitors. Ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior across temperature and applied voltage. The most common di- electrics used are Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics are good for providing high capacitances in a small package, but exhibit strong voltage and tem- perature coefficients as shown in Figures 3 and 4. When used with a 5V regulator, a 10 µF Y5V capacitor can exhibit an effective value as low as 1 µF to 2µF 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. 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 accelerometer or micro- phone works. For a ceramic capacitor the stress can be induced by vibrations in the system or thermal transients. Thermal Considerations The power handling capability of the device will be limited by the maximum rated junction temperature (125 °C). The power dissipated by the device will be made up of two components: 1. Output current multiplied by the input/output voltage differential: IOUT • (VIN – VOUT) and, 2. GND pin current multiplied by the input voltage: IGND • VIN. The GND pin current can be found by examining the GND Pin Current curves in the Typical Performance Character- istics. Power dissipation will be equal to the sum of the two components listed above. APPLICATIO S I FOR ATIO Figure 3. Ceramic Capacitor DC Bias Characterics Figure 4. Ceramic Capacitor Temperature Characterics DC BIAS VOLTAGE (V) 3010 F03 20 0 –20 –40 –60 –80 –100 0 4 8 10 26 12 14 X5R Y5V 16 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10 µF TEMPERATURE ( °C) –50 40 20 0 –20 –40 –60 –80 –100 25 75 3010 F04 –25 0 50 100 125 Y5V X5R BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10 µF |
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