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LT3009 Datasheet(PDF) 14 Page - Linear Technology |
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LT3009 Datasheet(HTML) 14 Page - Linear Technology |
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14 / 20 page  LT3009 Series 14 3009fd Figure 4. Noise Resulting from Tapping on a Ceramic Capacitor 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. The resulting voltages produced can cause appreciable amounts of noise, especially when a ceramic capacitor is used for noise bypassing. A ceramic capacitor produced Figure 4’s trace in response to light tapping from a pencil. Similar vibration induced behavior can masquerade as increased output voltage noise. APPLICATIONS INFORMATION Thermal Considerations The LT3009’s maximum rated junction temperature of 125°C limits its power-handling capability. Two components comprise the power dissipated by the device: 1. Output current multiplied by the input/output voltage differential: IOUT • (VIN – VOUT) 2. GND pin current multiplied by the input voltage: IGND • VIN GND pin current is found by examining the GND Pin Cur- rent curves in the Typical Performance Characteristics section. Power dissipation equals the sum of the two components listed prior. The LT3009 regulator has internal thermal limiting designed to protect the device during overload conditions. For con- tinuous normal conditions, do not exceed the maximum junction temperature rating of 125°C. Carefully consider all sources of thermal resistance from junction to ambi- ent including other heat sources mounted in proximity to the LT3009. For surface mount devices, heat sinking is accomplished by using the heat spreading capabilities of the PC board and its copper traces. Copper board stiffeners and plated through-holes can also be used to spread the heat generated by power devices. 100ms/DIV VOUT 500μV/DIV 3009 F04 VOUT = 0.6V COUT = 22μF ILOAD = 10μA |
Similar Part No. - LT3009_12 |
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Similar Description - LT3009_12 |
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