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MIC5233YM5 Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MIC5233YM5 Datasheet(HTML) 10 Page - Micrel Semiconductor |
10 / 12 page Micrel, Inc. MIC5233 July 2012 10 M9999-071212-B Maximum input voltage for a 10mA load current at 50°C ambient temperature is 34.9V, utilizing virtually the entire operating voltage range of the device. Total power dissipation is calculated using the following equation: PD = (VIN − VOUT)IOUT + VIN × IGND Eq. 4 Adjustable Regulator Application The MIC5233BM5 can be adjusted from 1.24V to 20V by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation: Due to the potential for input voltages up to 36V, ground current must be taken into consideration. If we know the maximum load current, we can solve for the maximum input voltage using the maximum power dissipation calculated for a 50°C ambient, 319mV. ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + = R2 R1 1 V V REF OUT Eq. 8 PD(MAX) = (VIN − VOUT)IOUT + VIN × IGND where VREF = 1.24V. 319mW = (VIN − 3V)100mA + VIN × 2.8mA Eq. 5 Feedback resistor R2 should be no larger than 300k Ω. Ground pin current is estimated using the typical characteristics of the device. 619mW = VIN (102.8mA) VIN = 6.02V Eq. 6 For higher current outputs only a lower input voltage will work for higher ambient temperatures. Assuming a lower output current of 10mA, the maximum input voltage can be recalculated: Figure 1. Adjustable Voltage Application 319mW = (VIN − 3V)10mA + VIN × 0.1mA 349mW = VIN × 10.1mA VIN = 34.9V Eq. 7 |
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