APW7046

APW7046 Dual Advanced PWM and Source-Sink Linear Controller Features 3 Regulated Voltages are provided General Description The APW7046 provides the power controls and protections for three output voltages on AGP/PCI Graphic Card applications. It integrates two PWM controllers , one SOURCE-SINK linear controller, as well as the monitor and protection functions into a single package. One PWM converter (PWM1) supplies the VCORE(1.5V) for the GPU with a standard buck converter. The other standard buck converter (PWM2) regulates the VMEM(2.5V) for the power of DDR memory. The SOURCE-SINK linear controller control two external MOSFETs to be a linear regulator with the capability of sourcing and sinking current. It regulates the VTT (1.25V) power for DDR Termination voltage. Additional built-in over-voltage protection (OVP) will be started when the VCORE or VMEM output is above 115% of each DAC setting (VCORE and VMEM). OVP function will shutdown the all output voltages until re-powering on the IC. For each PWM converter, the over-current function monitors the output current by sensing the voltage drop across the MOSFET‘s rDS(ON) , eliminating the need for a current sensing resistor. − Standard Buck Converter for VCORE (1.15~1.50V) www.DataSheet4U.com − Standard Buck Converter for VMEM (2.40~3.15V) −Linear Controller with SOURCE-SINK Regulation for VTT(1.25V) Simple Single-Loop Control Design − Voltage-Mode PWM Control Excellent Output Voltage Regulation − VCORE Outpu...