RT8857

RT8857/A 4/3/2/1-Phase PWM Controller with Embedded Drivers for CPU Core Power Supply General Description The RT8857/A is a 4/3/2/1-phase synchronous buck controller with 2 integrated MOSFET drivers for Intel VR11.1/VR10.x and AMD K8/K8_M2 CPUs power application. RT8857/A uses differential inductor DCR current sense to achieve phase current balance and active voltage positioning. Other features include adjustable operating frequency, adjustable soft start, power good indication, external error-amp compensation, over voltage protection, over current protection, VRHOT sensing and IMON for various applications. RT8857/A comes to a small footprint with WQFN-48L 7x7 package Features      12V Power Supply Voltage 4/3/2/1-Phase Power Conversion 2 Embedded MOSFET Drivers Internal Regulated 5V Output VID table for INTEL VR11.1/VR10.x and AMD K8/ K8_M2 CPUs Continuous Differential Inductor DCR Current Sense Adjustable Soft Start Adjustable Frequency Power Good Indication Adjustable Over Current Protection Over Voltage Protection VRHOT Sensing with External Thermistor IMON Output Current Indication Power State Indicator (PSI) Support MOSFET Power Stage Input Voltage (VIN) Down to 5V (RT8857A Only) Small 48-Lead WQFN Package RoHS Compliant and Halogen Free       Ordering Information RT8857/A Package Type QW : WQFN-48L 7x7 (W-Type) Operating Temperature Range G : Green (Halogen Free with Commercial Standard) Support VIN : 5/12V Support VIN : 12V Note :         Pi...