MAX17080

19-4175; Rev 1; 5/09 AMD 2-/3-Output Mobile Serial VID Controller General Description The MAX17080 is a triple-output, step-down, fixedfrequency controller for AMD’s serial VID interface (SVI) CPU and northbridge (NB) core supplies. The MAX17080 consists of two high-current SMPSs for the CPU cores and one 3A internal switch SMPS for the NB core. The two CPU core SMPSs run 180° out-of-phase for true interleaved operation, minimizing input capacitance. The 3A internal switch SMPS runs at twice the switching frequency of the core SMPS, reducing the size of the external components. The MAX17080 is fully AMD SVI compliant. Output voltages are dynamically changed through a 2-wire SVI, allowing the SMPSs to be individually programmed to different voltages. A slew-rate controller allows controlled transitions between VID codes and controlled soft-start. SVI also allows each SMPS to be individually set into a low-power pulse-skipping state. Transient phase repeat improves the response of the fixed-frequency architecture, reducing the total output capacitance for the CPU core. A thermistor-based temperature sensor provides a programmable thermal-fault output (VRHOT). The MAX17080 includes output overvoltage protection (OVP), undervoltage protection (UVP), and thermal protection. When any of these protection features detect a fault, the controller shuts down. True differential current sensing improves current limit and load-line accuracy. The MAX17080 has an adjustable switching freque...