The RT8803A is a 2/3-phase synchronous buck controller
specifically designed to power Intel? / AMD next generation
microprocessors. It implements an internal 8-bit DAC that is
identified by VID code of microprocessor directly. RT8803A
generates VID table that conform to Intel? VRD10.x and
VRD11 core power with 6.25mV increments and 0.5%
accuracy.
RT8803A adopts innovative time-sharing DCR current sensing
technique to sense phase currents for phase current balance,
load line setting and over current protection. Using a common
GM to sense all phase currents eliminates offset and linearity
variation between GMs in conventional current sensing
methods. As sub-milli-ohm-grade inductors are widely used
in modern motherboards, slight offset and linearity mismatch
will cause considerable current shift between phases. This
technique ensures good current balance at mass production.
Other features include over current protection, programmable
soft start, over voltage protection, and output offset setting.
RT8803A comes to a small footprint package with
VQFN-32L 5x5.