SC2643VX Datasheet | SEMTECH

Description The SC2643VX provides a solution for microprocessor core voltage regulation with up to 4 paralleled PWM channels. The solution can also be configured as 2, 3, or 4-phase form. This multi-phase buck regulator utilizes the phaseshift timing control to allow interleaved switching of the power switches. This architecture minimizes the core voltage ripple and the input current ripple, which leads to optimized voltage regulator design for power density, transient responses, and the thermal performances. To satisfy the highly dynamic nature of the modern microprocessors, the SC2643VX adopts peak current mode control topology which ensures wide control loop bandwidth and fast transient responses. The current mode control provides intrinsic phase current matching. The maximum ripple frequency is greater than 2.8MHz. One of the outstanding Features of the SC2643VX is its voltage regulation accuracy. Not only does it provide better than 0.5% set point accuracy, but also the accuracy to be fully pliant with stringent load line slope specifications mandated by the modern microprocessors. Lossless output current sensing ensures the regulator output voltage is accurately positioned according to the load current condition, and an internal temperature pensation technology further enhances the performance of voltage accuracy. The patented bi-Sense TM topology is employed by SC2643VX. The MOSFET Rds(on) and the output inductor winding resistance are used to generate the phase current information. The bi-Sense TM MOSFET driver plus the SC2643VX enables the plete solution. The SC2643VX is a multi-platform controller. It conforms to Intel VRM/VRD10.X, VRM9.X, and AMD K-8 (Opteron TM) VID specifications. With very minor changes of the schematic and the layout, the SC2643VX based solution can be ported form one platform to another. This greatly benefits system manufactures by reducing design cycle times and streamlining inventory management. The SC2643VX supports VID-on-Fly...