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MIC5159-3.0BM6 Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC5159-3.0BM6 Datasheet(HTML) 9 Page - Micrel Semiconductor |
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9 / 23 page  April 2004 9 M9999-041204 MIC5159 Micrel Layout Considerations Input and output capacitor placement should be as close as possible to the input and output, respectively. Trace resis- tance between the current sense and the MOSFET source should be minimized. Trace resistance will increase dropout voltage. This is more of a factor at higher output currents. Also, a minimum amount of distance between the gate pin, on the MIC5159, and the P-Channel MOSFET gate is recom- mended. A long trace can create a small parasitic inductor. This, coupled to the gate capacitance of the MOSFET, can create a high frequency tank circuit. A small 50 Ω resistor in series with the gate may be required to eliminate high- frequency noise. Adjustable Regulator Design The MIC5159 allows programming the output voltage any- where between 1.235V to V IN. Two resistors are used. See Figure 4. The resistor values are calculated by: R1= R2 V 1.235 1 OUT × − Where V OUT is the desired output voltage. VIN RS R1 R2 VOUT COUT = 10µF ceramic Si3445 IS ADJ IN EN GND GATE MIC5159-x.x Figure 4. Adjustable Regulator Design |
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