RT9247 Datasheet | Richtek

Description The RT9247 is a multi-phase buck DC/DC controller integrated with all control functions for GHz CPU VRM. The RT9247 controls 2 or 3 buck switching stages operating in interleaved phase set automatically. The multi-phase architecture provides high output current while maintaining low power dissipation on power devices and low stress on input and output capacitors. The high equivalent operating frequency also reduces the ponent dimension and the output voltage ripple in load transient. RT9247 controls both voltage and current loops to achieve good regulation, response & power stage thermal balance. Precise current loop using RDS(ON) as sense ponent builds precise load line for strict VRM DC & transient specification and also ensures thermal balance of different power stages. The settings of current sense, droop tuning, VCORE initial offset and over current protection are independent to pensation circuit of voltage loop. The feature greatly facilitates the flexibility of CPU power supply design and tuning. The DAC output of RT9247 supports VRD10 by 6-bit VID input, precise initial value & smooth VCORE transient at VID jump. The IC monitors the VCORE voltage for PGOOD and over-voltage protection. Soft-start, over-current protection and programmable under-voltage lockout are also provided to assure the safety of microprocessor and power system. Features z Multi-Phase Power Conversion with Automatic Phase Selection VRD10 DAC Output with Active Droop pensation for Fast Load Transient Smooth VCORE Transition at VID Jump Power Stage Thermal Balance by RDS(ON) Current Sense Hiccup Mode Over-Current Protection Programmable Switching Frequency (50k Hz to 400k Hz per Phase), Under-Voltage Lockout and Soft-Start High Ripple Frequency Times Channel Number Ro HS pliant and 100% Lead (Pb)-Free z z z z z z z Applications z z z Intel® Processors Voltage Regulator: VRD10 Low Output Voltage, High Current DC-DC Converters Voltage Regulator Modules Pin Configurations (TO...