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RT9246

Richtek Technology
Part Number RT9246
Manufacturer Richtek Technology
Description Multi-Phase PWM Controller
Published Dec 2, 2007
Detailed Description www.DataSheet4U.com RT9246 Multi-Phase PWM Controller for CPU Core Power Supply General Description The RT9246 is a mul...
Datasheet PDF File RT9246 PDF File

RT9246
RT9246

Overview
www.
DataSheet4U.
com RT9246 Multi-Phase PWM Controller for CPU Core Power Supply General Description The RT9246 is a multi-phase buck DC/DC controller integrated with all control functions for GHz CPU VRM.
The RT9246 controls 2 or 3 buck switching stages operating in interleaved phase set automatically.
The multiphase 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 component dimension and the output voltage ripple in load transient.
RT9246 controls both voltage and current loops to achieve good regulation, response & power stage thermal balance.
Precise current loop using RDS(ON) as sense component 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 compensation circuit of voltage loop.
The feature greatly facilitates the flexibility of CPU power supply design and tuning.
The DAC output of RT9246 supports K8 CPU by 5-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 z z z z z z z Multi-Phase Power Conversion with Automatic Phase Selection K8 DAC Output with Active Droop Compensation 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 (50kHz to 400kHz per Phase), Under-Voltage Lockout and Soft-Start High Ripple Frequency Times Channel Number RoHS Compliant and 100% Lead (Pb)-Free Applications AMD® AthlonTM 64 and OpteronTM Processors Voltag...


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