IC Multi-Phase PWM Controller RT8802A

RT8802A is an IC Multi-Phase PWM Controller that include a  2/3/4/5-phase synchronous buck controller specifically designed to power Intel/AMD next generation microprocessors. It's used in an internal 8-bit DAC that is identified by VID code of microprocessor directly. RT8802A generates VID table that conform to Intel® VRD10.x and VRD11 core power with 6.25mV increments and 0.5% accuracy.RT8802A adopts innovative time-sharing DCR current sensing technique to sense phase currents for phase current balance, load line setting and over current protection. Using a common GM to sense all phase currents eliminates offset and linearity variation between GMs in conventional current sensing methods. As sub-milli-ohm-grade inductors are widely used in modern motherboards, slight offset and linearity mismatch will cause considerable current shift between phases. This technique ensures good current balance in mass production.

 

This IC use together with IC RT9605B in a motherboard and some of mosfet n-channel like APM2518N and APM2558N.

Features :
• Power Supply +5 V
• 2/3/4/5-Phase Power Conversion with Automatic Phase Selection
• 8-bit VID Interface, Supporting Intel VRD11/VRD10.x and AMD K8, K8_M2 CPUs
• VR_HOT and VR_FAN Indication
• Precision Core Voltage Regulation
• Power Stage Thermal Balance by DCR Current Sensing
• Adjustable Soft-start
• Over-Voltage Protection
• Adjustable Frequency and Typical at 300kHz per Phase
• Power Good Indication
• 40-Lead VQFN Package
• RoHS Compliant and 100% Lead (Pb)-Free