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MIC2165YMME Datasheet(PDF) 22 Page - Micrel Semiconductor |
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MIC2165YMME Datasheet(HTML) 22 Page - Micrel Semiconductor |
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22 / 28 page  Micrel, Inc. MIC2165 September 2010 22 M9999-092410-E PCB Layout Guidelines Warning!!! To minimize EMI and output noise, follow these layout recommendations. PCB Layout is critical to achieve reliable, stable and efficient performance. A ground plane is required to control EMI and minimize the inductance in power, signal and return paths. The following guidelines should be followed to insure proper operation of the MIC2165 converter. IC • Place the IC and MOSFETs close to the point of load (POL). • Use fat traces to route the input and output power lines. • Signal and power grounds should be kept separate and connected at only one location. • The exposed pad (ePad) on the bottom of the IC must be connected to the ground through several vias. • The feedback resistors should be placed close to the FB pin. The top feedback resistor should connect directly to the output node. Run this trace away from the switch node (SW). Input Capacitor • Place the VIN input capacitor next. • Place the VIN input capacitors on the same side of the board and as close to the MOSFETs as possible. • Keep both the VIN and PGND connections short. • Place several vias to the ground plane close to the VIN input capacitor ground terminal. • Use either X7R or X5R dielectric input capacitors. Do not use Y5V or Z5U type capacitors. • Do not replace the ceramic input capacitor with any other type of capacitor. Any type of capacitor can be placed in parallel with the input capacitor. • If a Tantalum input capacitor is placed in parallel with the input capacitor, it must be recommended for switching regulator applications and the operating voltage must be derated by 50%. • In “Hot-Plug” applications, a Tantalum or Electrolytic bypass capacitor must be used to limit the over- voltage spike seen on the input supply with power is suddenly applied. • The 2.2µF (minumum) capacitors, which connect to the VDD terminal, must be located right at the IC. The VDD terminal is very noise sensitive and placement of the capacitor is very critical. Connections must be made with wide trace. Inductor • Keep the inductor connection to the switch node (SW) short. • Do not route any digital lines underneath or close to the inductor. • Keep the switch node (SW) away from the feedback (FB) pin. • The SW pin should be connected directly to the drain of the low-side MOSFET to accurate sense the voltage across the low-side MOSFET. • To minimize noise, place a ground plane underneath the inductor. Output Capacitor • Use a wide trace to connect the output capacitor ground terminal to the input capacitor ground terminal. • Phase margin will change as the output capacitor value and ESR changes. Contact the factory if the output capacitor is different from what is shown in the BOM. • The feedback trace should be separate from the power trace and connected as close as possible to the output capacitor. Sensing a long high current load trace can degrade the DC load regulation. Schottky Diode • Place the Schottky diode on the same side of the board as the MOSFETs and VIN input capacitor. • The connection from the Schottky diode’s Anode to the input capacitors ground terminal must be as short as possible. • The diode’s Cathode connection to the switch node (SW) must be keep as short as possible. RC Snubber • Place the RC snubber on the same side of the board and as close to the MOSFETs as possible. MOSFETs • Low-side MOSFET gate drive trace (DL pin to MOSFET gate pin) must be short and routed over a ground plane. The ground plane should be the connection between the MOSFET source and PGND. • Chose a low-side MOSFET with a high CGS/CGD ratio and a low internal gate resistance to minimize the effect of dv/dt inducted turn-on. • Do not put a resistor between the LSD output and the gate. • Use a 4.5V VGS rated MOSFET. Its higher gate threshold voltage is more immune to glitches than a 2.5V or 3.3V rated MOSFET. MOSFETs that are rated for operation at less than 4.5V VGS should not be used. |
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