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
1. Dual-Output Fixed-Frequency Core Supply Controller
2. Core SMPS
(1) Split or Combinable Outputs Detected at Power-Up
(2) Dynamic Phase Selection Optimizes Active/Sleep Efficiency
(3) Transient Phase Repeat Reduces Output Capacitance
(4) True Out-of-Phase Operation Reduces Input Capacitance
(5) Programmable AC and DC Droop
(6) Accurate Current Balance and Current Limit
(7) Integrated Drivers for Large Synchronous
(8) Rectifier MOSFETs
(9) Programmable 100kHz to 600kHz Switching Frequency
(10) 4V to 26V Battery Input Voltage Range
2. 4A Internal Switch Northbridge SMPS
(1) 2.7V to 5.5V Input Voltage Range
(2) 2x Programmable Switching Frequency
(3) 75mΩ/40mΩPower Switches
3. ±0.5% VOUTAccuracy over Line, Load, and Temperature
4. AMD SVI-Compliant Serial Interface with Switchable Address
5. Bit On-Board DAC: 0 to +1.550V Output Adjust Range
6. Integrated Boost Switches
7.Adjustable Slew-Rate Control
8. Power-Good (PWRGD) and Thermal-Fault (VRHOT) Outputs
9. System Power-OK (PGD_IN) Input
10. Overvoltage, Undervoltage, and Thermal-Fault Protection
11. Voltage Soft-Startup and Passive Shutdown
12. < 1µA Typical Shutdown Current
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Datasheet