RICHTEK RT8884BGQW

RT8884B is a 4/3/2/1 multiphase synchronous buck controller designed to meet VR12.5-compatible CPU specifications with a serial VID control interface. The controller employs the proprietary G-NAVP (Green Native AVP) topology, derived from an error amplifier with finite DC gain combined with current mode control, which simplifies droop setting to satisfy the AVP (Adaptive Voltage Positioning) requirements of all CPUs. Based on the G-NAVP topology, the RT8884B also incorporates a fast response mechanism to optimize AVP performance during load transients. The RT8884B supports mode transition functionality with multiple operating states. A built-in SVID interface enables communication with VR12.5-compliant CPUs. Dynamic VID is supported with three distinct slew rates: fast, slow, and decay. By leveraging the G-NAVP topology, the RT8884B's operating frequency varies with VID, load current, and input voltage to further improve efficiency, even in CCM. In addition to G-NAVP, CCRCOT (Constant Current Ripple Constant On-Time) technology delivers excellent output voltage ripple across the full input/output range.

• VR12.5 serial VID interface compatible
• 4/3/2/1-phase PWM controller
• G-NAVP topology
• 0.5% DAC accuracy
• Differential remote voltage sensing
• Integrated ADC for platform programming
• Precise current balancing
• System thermal compensated AVP
• Diode emulation mode for single-phase operation at light load
• Fast transient response
• VR ready indicator
• Thermal throttling
• Current monitor output
• OVP, UVP, OCP, negative voltage protection, UVLO
• External no-load offset setting
• DVID enhancement
• Compact 32-pin WQFN package
• RoHS compliant and halogen-free

• VR12.5 core power supply
• Notebook/desktop/server multiphase CPU core power supply
• AVP buck converter