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MIC5259-3.0YML Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC5259-3.0YML Datasheet(HTML) 9 Page - Micrel Semiconductor |
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9 / 11 page  Micrel, Inc. MIC5259 September 2006 9 M9999-091406 The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT) IOUT + VIN IGND Substituting PD(max) for PD and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the MIC5259-2.8BML at 70°C with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ° ° − ° = C/W 90 C 70 C 125 PD(max) PD(max) = 611mW The junction-to-ambient thermal resistance for the minimum footprint is 90°C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 2.8V and an output current of 200mA, the maximum input voltage can be determined. Because this device is CMOS and the ground current is typically 110µA over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. 611mW = (VIN – 2.8V) 200mA 611mW = VIN × 200mA – 560mW 1171mW = VIN × 200mA VIN(max) = 5.85V Therefore, a 2.8V application at 200mA of output current can accept a maximum input voltage of 5.85V in an MLF package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the “Regulator Thermals” section of Micrel’s Designing with Low-Dropout Voltage Regulators handbook. |
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