General Description
The MAX17480 is a triple-output, step-down, fixed frequency controller for AMD’s serial VID interface (SVI) CPU and northbridge (NB) core supplies. The MAX17480 consists of two high-current SMPSs for the CPU cores and one 4A 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 4A internal switch SMPS runs at twice the switching frequency of the core SMPS, reducing the size of the external components.
The MAX17480 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.

Features
♦ Dual-Output Fixed-Frequency Core Supply Controller
   Split or Combinable Outputs Detected at Power-Up
   Dynamic Phase Selection Optimizes
   Active/Sleep Efficiency
   Transient Phase Repeat Reduces Output Capacitance
   True Out-of-Phase Operation Reduces Input Capacitance
   Programmable AC and DC Droop
   Accurate Current Balance and Current Limit
   Integrated Drivers for Large Synchronous
   Rectifier MOSFETs
   Programmable 100kHz to 600kHz Switching Frequency
   4V to 26V Battery Input Voltage Range
♦ 4A Internal Switch Northbridge SMPS
   2.7V to 5.5V Input Voltage Range
   2x Programmable Switching Frequency
   75mΩ/40mΩPower Switches
♦ ±0.5% VOUTAccuracy over Line, Load, and
   Temperature
♦ AMD SVI-Compliant Serial Interface with
   Switchable Address
♦ 7-Bit On-Board DAC: 0 to +1.550V Output Adjust Range
♦ Integrated Boost Switches
♦ Adjustable Slew-Rate Control
♦ Power-Good (PWRGD) and Thermal-Fault
   (VRHOT) Outputs
♦ System Power-OK (PGD_IN) Input
♦ Overvoltage, Undervoltage, and Thermal-Fault
   Protection
♦ Voltage Soft-Startup and Passive Shutdown
♦ < 1µA Typical Shutdown Current

Applications
   Mobile AMD SVI Core Supplies
   Multiphase CPU Core Supplies
   Voltage-Positioned, Step-Down Converters
   Notebook/Desktop Computers