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MP2212DQ Datasheet(PDF) 10 Page - Monolithic Power Systems |
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MP2212DQ Datasheet(HTML) 10 Page - Monolithic Power Systems |
10 / 14 page MP2212 – 16V, 3A, 600kHz SYNCHRONOUS STEP-DOWN CONVERTER MP2212 Rev. 1.01 www.MonolithicPower.com 10 2/22/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. Output Capacitor Selection The output capacitor keeps output voltage ripple small and ensures regulation loop stable. The output capacitor impedance shall be low at the switching frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended. If electrolytic capacitor is used, pay attention to output ripple voltage, extra heating, and the selection of feedback resistor R1 (refer to “Output Voltage Setting” section) due to large ESR of electrolytic capacitor. The output ripple ∆VOUT is approximately: OUT IN OUT OUT IN OSC OSC Vx(V V ) 1 V x(ESR ) V xf xL 8xf xC3 − Δ≤ + The output capacitance is recommended to be less than 100μF. External Schottky Diode For this part, an external schottky diode is recommended to be placed close to "SW" and "GND" pins, especially when the output current is larger than 2A. With the external schottky diode, the voltage spike and negative kick on "SW" pin can be minimized; moreover, the conversion efficiency can also be improved a little. For the external schottky diode selection, it's noteworthy that the maximum reverse voltage rating of the external diode should be larger than the maximum input voltage. As for the current rating of this diode, 0.5A rating should be sufficient. PCB Layout Guide PCB layout is very important to achieve stable operation. It is highly recommended to duplicate EVB layout for optimum performance. If change is necessary, please follow these guidelines as follows. Here, the typical application circuit is taken as an example to illustrate the key layout rules should be followed. 1) For MP2212DQ, a PCB layout with more than (or) four layers is recommended. 2) The high current paths (GND, IN and SW) should be placed very close to the device with short, direct and wide traces. 3) For MP2212DQ, two input ceramic capacitors (2 x (10μF~22μF)) are strongly recommended to be placed on both sides of the MP2212DQ package and keep them as close as possible to the “IN” and “GND” pins. For MP2212DN, an input ceramic capacitor should be placed as close as possible to “IN” and “GND” pins. 4) A RC low pass filter is recommended for VCC supply. The VCC decoupling capacitor must be placed as close as possible to “VCC” pin and “GND” pin. 5) The external feedback resistors shall be placed next to the FB pin. Keep the FB trace as short as possible. 6) Keep the switching node SW short and away from the feedback network. Top Layer Inner Layer1 |
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