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IRU1260CP Datasheet(PDF) 6 Page - International Rectifier |
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IRU1260CP Datasheet(HTML) 6 Page - International Rectifier |
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6 / 12 page  IRU1260 6 Rev. 2.1 09/19/02 www.irf.com Layout Consideration The IRU1260 like all other high speed linear regulators need to be properly laid out to insure stable operation. The most important component is the output capacitor, which needs to be placed close to the output pin and connected to this pin using a plane connection with a low inductance path. IRU1260 in Ultra LDO, Single Output Application The IRU1260 can also be used in single supply applica- tions where the difference between input and output is much lower than the standard 1.5V dropout that is ob- tainable with standard LDO devices. The schematic in Figure 7 shows the application of the IRU1260 in a single supply with the second LDO being disabled. In this application, the IRU1260 is used on the VGA card to convert 3.3V supply to 2.7V to power the Intel 740 chip rather than the conventional LDO which due to its 1.5V minimum dropout spec must use the 5V supply to achieve the same result. The difference is a substan- tial decrease in the power dissipation as shown below. The maximum power dissipation of the Intel 740 chip is 5.8W, which at 2.7V results in: a) Using standard LDO, the power dissipated in the de- vice is: Using surface mount TO-263 package with 25 8C/W junction to air thermal resistance results in: This is very close to the thermal shutdown of the IC. b) Using IRU1260, the power dissipated in the device is drastically reduced by using 3.3V supply instead of 5V. Using surface mount TO-263 package with 25 8C/W junction to air thermal resistance results in: A reduction of 91 8C in junction temperature. Io = = 2.15A 5.8 2.7 PD = (VIN - Vo) 3Io = (5 - 2.7)32.15 = 4.94W TJ = PD 3uJA + TA = 4.94325 + 25 = 1488C PD = (VIN - Vo) 3Io = (3.3 - 2.7)32.15 = 1.3W TJ = PD 3uJA + TA = 1.3325 + 25 = 578C |
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