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LT3023 Datasheet(PDF) 11 Page - Linear Technology |
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LT3023 Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page LT1965 11 1965f APPLICATIONS INFORMATION The following tables list thermal resistance for several different board sizes and copper areas. All measurements were taken in still air on 1/16" FR-4 board with one ounce copper. Table 1. Measured Thermal Resistance for DFN Package Copper Area Thermal Resistance Topside* Backside Board Area (Junction-to-Ambient) 2500mm2 2500mm2 2500mm2 60°C/W 1000mm2 2500mm2 2500mm2 62°C/W 225mm2 2500mm2 2500mm2 65°C/W 100mm2 2500mm2 2500mm2 68°C/W 50mm2 2500mm2 2500mm2 70°C/W *Device is mounted on topside Table 2. Measured Thermal Resistance for MSOP Package Copper Area Thermal Resistance Topside* Backside Board Area (Junction-to-Ambient) 2500mm2 2500mm2 2500mm2 55°C/W 1000mm2 2500mm2 2500mm2 57°C/W 225mm2 2500mm2 2500mm2 60°C/W 100mm2 2500mm2 2500mm2 65°C/W 50mm2 2500mm2 2500mm2 68°C/W *Device is mounted on topside Table 3. Measured Thermal Resistance for DD-PAK Package Copper Area Thermal Resistance Topside* Backside Board Area (Junction-to-Ambient) 2500mm2 2500mm2 2500mm2 25°C/W 1000mm2 2500mm2 2500mm2 30°C/W 125mm2 2500mm2 2500mm2 35°C/W *Device is mounted on topside Measured Thermal Resistance for TO-220 Package Thermal Resistance (Junction-to-Case) = 3°C/W Calculating Junction Temperature Example: Given an output voltage of 2.5V, an input voltage range of 3.3V ± 5%, an output current range of 0mA to 500mA and a maximum ambient temperature of 85°C, what will the maximum junction temperature be? The power dissipated by the device equals: IOUT(MAX) • (VIN(MAX) – VOUT) + IGND • VIN(MAX) where: IOUT(MAX) = 500mA VIN(MAX) = 3.465V IGND at (IOUT = 500mA, VIN = 3.465V) = 8.2mA So, P = 500mA(3.465V – 2.5V) + 8.2mA(3.465V) = 0.511W Using a DFN package, the thermal resistance will be in the range of 60°C/W to 70°C/W depending on the cop- per area. So the junction temperature rise above ambient approximately equals: 0.511W • 65°C/W = 33.22°C The maximum junction temperature equals the maximum ambient temperature plus the maximum junction tempera- ture rise above ambient or: TJMAX = 85°C + 33.22°C = 118.22°C |
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