MP2932 - 6-PHASE PWM CONTROLLER WITH 8-BIT ADC CODE

MP2932 Rev.1.02

www.MonolithicPower.com

18

4/30/2012

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Low

capacitance,

high-frequency

ceramic

capacitors are needed in addition to the bulk

capacitors to suppress leading and falling edge

voltage spikes. Select low ESL ceramic

capacitors and place one as close as possible

to each upper MOSFET drain to minimize board

parasitic

impedances

and

maximize

suppression.

PC Board Layout

For best performance of the MP2932, the

following guidelines should be strictly followed:

Within the allotted implementation area, place

the switching components first. Switching

component placement should take into account

power dissipation. Align the output inductors

and MOSFETs such that space between the

components is minimized while creating the

PHASE plane. If possible, duplicate the same

placement of these components for each phase.

Next, place the input and output capacitors.

Position one high frequency ceramic input

capacitor next to each upper MOSFET drain.

Place the input capacitors as close to the upper

MOSFET drains as dictated by the component

size and dimensions. Locate the output

capacitors between the inductors and the load,

while keeping them in close proximity to the

microprocessor socket.