Datasheet Summary
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4/3/2/1-Phase PWM Controller for AMD AM2/AM2+ CPUs
General Description
The RT8855 is a 4/3/2/1-phase synchronous buck controller with two integrated MOSFET drivers for CPU power application and a single-phase buck with integrated MOSFET driver for North-Bridge (NB) chipset.The RT8855 uses differential inductor DCR current sense to achieve phase current balance and active voltage positioning. Other Features include adjustable operating frequency, power good indication, external error-amp pensation, over voltage protection, over current protection and enable/ shutdown for various applications. The RT8855 es to a small footprint with WQFN-48L 7x7 package.
Applications
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