资 源 简 介
RT9245A is a mulTI-phase buck DC/DC controllerintegrated with all control funcTIons for AMD K8 CPU orIntel® GHz CPU which is VRD10.x-compliant. TheRT9245A could be operated with 2, 3 or 4 buck switchingstages operaTIng in interleaved phase set automaTIcally.The multiphase architecture provides high output currentwhile maintaining low power dissipation on power devicesand low stress on input and output capacitors. The highequivalent operating frequency also reduces thecomponent dimension and the output voltage ripple in loadtransient.RT9245A implements both voltage and current loops toachieve good regulation, response and power stagethermal balance.RT9245A applies the DCR sensing technology newly. TheRT9245A extracts the DCR of output inductor as sensecomponent to deliver a precise load line regulation andgood thermal balance for next generation processorapplication.Current sense setting, droop tuning, VCORE initial offsetand over current protection are independent oncompensation circuit of voltage loop. The feature greatlyfacilitates the flexibility of CPU power supply design andtuning. The DAC output of RT9245A supports AMD K85-bit VID and Intel® VRD10.x with 6-bit VID input, preciseoffset value & smooth VCORE transient at VID jump. TheIC monitors the VCORE voltage for PGOOD and over-voltageprotection. Soft-start, over-current protection andprogrammable under-voltage lockout are also provided toassure the safety of microprocessor and power system.The RT9245A comes to a small footprint packageTSSOP-28.
