RT8881A – Multi-Phase PWM Controller

Part Number : RT8881A

Function : Multi-Phase PWM Controller

Manufactures : Richtek

Images :

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RT8881A image

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Description :

® RT8881A Dual-Channel, Multi-Phase PWM Controller with I2C Interface for AMD SVI2 CPU Power Supply General Description The RT8881A is a multi-phases PWM controller. Moreover, it is compliant with AMD SVI2 Voltage Regulator Specification to support both CPU core (VDD) and Northbridge portion (VDDNB) of the CPU. The RT8881A adopts the G-NAVPTM (Green-Native AVP), which is a Richtek’s proprietary topology. The G-NAVP makes it an easy setting controller to meet all AMD AVP (Adaptive Voltage Positioning) requirements. The droop is easily programmed by setting the DC gain of the error amplifier. With proper compensation, the load transient response can achieve optimized AVP performance. The RT8881A uses SVI2 interface to control 8-bit DAC to set output voltage and operation mode, and support a dynamic platform master. An I2C interface is available for advanced power configuration and monitoring. The RT8881A also features programmable power states with different sets of operating phase number, over clocking offset, switching frequency, load-line and protection setting. The platform master can optimize the performance and efficiency of the power according to different working scenarios via the I2C interface. The RT8881A also provides power good indication, over-current indication and dual OCP mechanism for AMD SVI2 CPU core and NB. It also features complete fault protection functions including overvoltage, under-voltage and negative-voltage protections. Features  Dual Outputs :  4/3/2/1-Phase for VDD  2/1/0-Phase for VDDNB  G-NAVPTM Topology  Support Dynamic Load-Line and Zero Load-Line  Diode Emulation Mode at Light Load Condition  SVI2 Interface to Comply with AMD Power Management Protocol  I2C Interface for Platform Configuration  Build-in ADC for VOUT and IOUT Reporting  Immediate OV, UV and NV Protections and UVLO  Programmable Dual OCP Mechanism  Accurate Current Balance  Fast Transient Response  Dynamic Phase Up/Down Control  Programmable Power State Control  Power Good Indicator  Over-Current Indicator  Over Clocking Offset Capabilities  52-Lead WQFN Package  RoHS Compliant and Halogen Free Applications  AMD SVI2 CPU  Desktop Computer Simplified Application Circuit To CPU To SMBUS RT8881A OCP_L PHASE1 SVC PHASE2 SVD PWM3 SVT PWM4 SCL PWMA1 SDA PWMA2 MOSFET MOSFET RT9624A MOSFET RT9624A MOSFET RT9624A MOSFET RT9624A MOSFET VVDD VVDDNB Copyright ©2014 Richtek Technology Corporation. All rights reserved. DS8881A-01 January 2014 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT8881A Ordering Information RT8881A Package Type QW : WQFN-52L 6×6 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are :  RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering processes. Marking Information RT8881A GQW YMDNN RT8881AG […]

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RT8881A Datasheet

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