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MIC5256-3.0YM5 Datasheet(PDF) 11 Page - Micrel Semiconductor |
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MIC5256-3.0YM5 Datasheet(HTML) 11 Page - Micrel Semiconductor |
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11 / 13 page  Micrel, Inc. MIC5256 August 2010 11 M9999-080510 TJ(max) is the maximum junction temperature of the die, 125°C, and TA is the ambient operating temperature. θJA is layout dependent; Table 1 shows examples of junction-to-ambient thermal resistance for the MIC5256. Package θ JA Recommended Minimum Footprint θ JA 1” Square Copper Clad θ JC SOT23-5 (M5 or D5) 235°C/W 185°C/W 145°C/W Table 1. SOT-23-5 Thermal Resistance 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 MIC5256-3.0BM5 at 50°C with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ° ° − ° = C/W 235 C 50 C 125 PD(max) PD(max) = 315mW The junction-to-ambient thermal resistance for the minimum footprint is 235°C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.0V and an output current of 150mA, the maximum input voltage can be determined. Because this device is CMOS and the ground current is typically 100µA over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. 315mW = (VIN – 3.0V) 150mA 315mW = VIN·•150mA – 450mW 810mW = VIN·•150mA VIN(max) = 5.4V Therefore, a 3.0V application at 150mA of output current can accept a maximum input voltage of 5.4V in a SOT- 23-5 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. Fixed Regulator Applications Figure 1. Low-Noise Fixed Voltage Application Figure 1 shows a standard low-noise configuration with a 47kΩ pull-up resistor from the error flag to the input voltage and a pull-down capacitor to ground for the purpose of fault indication. EN (Pin 3) is connected to IN (Pin 1) for an application where enable/shutdown is not required. COUT = 1.0µF minimum. |
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