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MIC5206-3.8BMM Datasheet(PDF) 7 Page - Micrel Semiconductor |
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MIC5206-3.8BMM Datasheet(HTML) 7 Page - Micrel Semiconductor |
7 / 8 page MIC5206 Micrel January 2000 7 MIC5206 Resistor values are not critical because ADJ (adjust) has a high input impedance, but for best results use resistors of 470k Ω or less. A capacitor from ADJ to ground provides greatly improved noise performance. 1 2 3 4 8 7 6 5 2.2µF VOUT Flag Output (optional) 47k R1 R2 MIC5206BMM VIN CBYP 470pF ADJ Figure 3. Ultra-Low-Noise Adjustable Voltage Application Figure 3 also includes a 470pF capacitor for lowest-noise operation and shows EN (pin 7) connected to IN (pin 8) for an application where enable/shutdown is not required. C OUT = 2.2 µF minimum. The error flag is shown with a 47kΩ pullup resistor. Thermal Considerations Layout The MIC5206-x.xBM5 (5-lead SOT-23 package) has the following thermal characteristics when mounted on a single layer copper-clad printed circuit board. Multilayer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity. PC Board θθθθθ JA Dielectric FR4 220 °C/W Ceramic 200 °C/W SOT-23-5 Thermal Characteristics The “worst case” value of 220 °C/W assumes no ground plane, minimum trace widths, and a FR4 material board. The MIC5206-xxBMM (8-lead MSOP) has a thermal resis- tance of 200 °C/W when mounted on a FR4 board with minimum trace widths and no ground plane. PC Board θθθθθ JA Dielectric FR4 200 °C MSOP Thermal Characteristics Nominal Power Dissipation and Die Temperature The MIC5206-x.xBM5 at a 25 °C ambient temperature will operate reliably at over 450mW power dissipation when mounted in the “worst case” manner described above. At an ambient temperature of 40 °C, the device may safely dissi- pate over 380mW. These power levels are equivalent to a die temperature of 125 °C, the maximum operating junction tem- perature for the MIC5206. For additional heat sink characteristics, please refer to Micrel Application Hint 17, “Calculating P.C. Board Heat Sink Area For Surface Mount Packages”. |
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