RT8857/A特性及典型应用电路

4/3/2/1-相脉冲宽带调制器(PWM) RT8857/A特性及典型应用电路



4/3/2/1-Phase PWM Controller with Embedded Drivers for CPU Core Power Supply



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(特点)



• 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



Application (应用)



• Desktop CPU Core Power

• Low Voltage, High Current DC/ DC Converter

RT8857典型应用电路

点击查看:RT8857/A datasheet