The AOZ73004CQI from Alpha & Omega Semiconductor is a Multi-Phase Buck Controller that is ideal for GPU and CPU power, graphic cards, and desktop and notebook applications. It requires an input voltage of 2.7 - 20 V. This power management IC (PMIC) has been designed to meet NVIDIA's OpenVReg (OVR-4-22) power supply specifications. It offers one output rail and supports the PWMVID interface for allowing dynamic adjustment of the output voltage. This buck controller utilizes Alpha and Omega Semiconductor's novel AOS advanced transient modulator (A2TM), which combines an advanced variable frequency hysteretic peak current mode control with a proprietary phase current sensing scheme for fast transient response and low system cost. It integrates a high-performance operational error amplifier and includes an autonomous phase management function for power optimization at lighter loads.
This PMIC employs differential remote sensing to achieve a regulated load output voltage accuracy of 1%. It allows pairing and supports multi-sourced industry-standard driver-MOSFET (DrMOS) modules to ensure design compatibility. This PMIC combines automatic phase shedding (APS), diode emulation mode (DEM), and a power-saving interface (PSI) to improve energy efficiency. It includes protection features such as over-voltage protection (OVP), under-voltage protection (UVP), thermal warning, and cycle-by-cycle current limit. This multi-phase buck controller is available in a surface-mount package that measures 4 x 4 mm.
