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MIC49150-0.9BR Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MIC49150-0.9BR Datasheet(HTML) 10 Page - Micrel Semiconductor |
10 / 12 page MIC49150 Micrel MIC49150 10 January 2002 Quick Method Determine the power dissipation requirements for the design along with the maximum ambient temperature at which the device will be operated. Refer to Figure 3, which shows safe operating curves for three different ambient temperatures: 25 °C, 50°C and 85°C. From these curves, the minimum amount of copper can be determined by knowing the maxi- mum power dissipation required. If the maximum ambient temperature is 50 °C and the power dissipation is as above, 513mW, the curve in Figure 3 shows that the required area of copper is less than 100mm2. The θ JA of this package is ideally 80°C/W, but it will vary depending upon the availability of copper ground plane to which it is attached. Adjustable Regulator Design The MIC49150 adjustable version allows programming the output voltage anywhere between 0.9Vand 5V. Two resistors are used. The resistor value between V OUT and the adjust pin should not exceed 10k Ω. Larger values can cause instability. The resistor values are calculated by: R1 R2 V OUT =× 09 1 . – Where V OUT is the desired output voltage. Enable The fixed output voltage versions of the MIC49150 feature an active high enable input (EN) that allows on-off control of the regulator. Current drain reduces to “zero” when the device is shutdown, with only microamperes of leakage current. The EN input has TTL/CMOS compatible thresholds for simple logic interfacing. EN may be directly tied to V IN and pulled up to the maximum supply voltage |
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