SC2646B
SC2646B is Combi-Sense PWM Controller manufactured by SEMTECH.
Features
2, 3 or 4 Phase PWM Controller
POWER MANAGEMENT Description
The SC2646B controller provides a microprocessor core voltage regulation solution for up to 4 paralleled PWM channels. The solution can be configured in 2, 3, or 4phase form. This multi-phase buck regulator utilizes phase-shift timing control to allow interleaved switching of the power switches. The product’s architecture minimizes the core voltage ripple and the input current ripple, which leads to optimized voltage regulator design for power density, transient responses, and thermal performances. To satisfy the highly dynamic nature of the modern microprocessors, the SC2646B 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 2MHz. One of the outstanding Features of the SC2646B device is its voltage regulation accuracy. Not only does it provide 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. Semtech’s patented bi-Sense TM topology is employed by SC2646B controller. The MOSFET Rds(on) and the output inductor winding resistance is used to generate the phase current information. Semtech’s SC1211 bi Sense TM MOSFET driver works with the SC2646B to enable a plete solution. The cycle-by-cycle current limit plus the intelligent over current shut down provide the maximum versatility of the system without false tripping under all possible changes of VID and load conditions. The differential voltage feedback sense eliminates the error caused by high load current on the ground plane. External offset is easy to achieve for the VID settings. The enable function...
