資料介紹
RT9245A is a multi-phase buck DC/DC controller
integrated with all control functions for AMD K8 CPU or
Intel? GHz CPU which is VRD10.x-compliant. The
RT9245A could be operated with 2, 3 or 4 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.
RT9245A implements both voltage and current loops to
achieve good regulation, response and power stage
thermal balance.
RT9245A applies the DCR sensing technology newly. The
RT9245A extracts the DCR of output inductor as sense
component to deliver a precise load line regulation and
good thermal balance for next generation processor
application.
Current sense setting, droop tuning, VCORE initial offset
and over current protection are independent on
compensation circuit of voltage loop. The feature greatly
facilitates the flexibility of CPU power supply design and
tuning. The DAC output of RT9245A supports AMD K8
5-bit VID and Intel? VRD10.x with 6-bit VID input, precise
offset 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.
The RT9245A comes to a small footprint package
TSSOP-28.
integrated with all control functions for AMD K8 CPU or
Intel? GHz CPU which is VRD10.x-compliant. The
RT9245A could be operated with 2, 3 or 4 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.
RT9245A implements both voltage and current loops to
achieve good regulation, response and power stage
thermal balance.
RT9245A applies the DCR sensing technology newly. The
RT9245A extracts the DCR of output inductor as sense
component to deliver a precise load line regulation and
good thermal balance for next generation processor
application.
Current sense setting, droop tuning, VCORE initial offset
and over current protection are independent on
compensation circuit of voltage loop. The feature greatly
facilitates the flexibility of CPU power supply design and
tuning. The DAC output of RT9245A supports AMD K8
5-bit VID and Intel? VRD10.x with 6-bit VID input, precise
offset 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.
The RT9245A comes to a small footprint package
TSSOP-28.
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