The uP9508Q is an IMVP8 compliant desktop CPU voltage regulator controller that integrates a 3-phase PWM controller for Vcore and a 2-phase PWM controller for VccGT. The Vcore controller can be configured as 3/2/1-phase, and the VccGT controller can be configured as 2/1-phase for platform power design flexibility. This part outputs PWM signal to external MOSFET driver to drive the buck power stage. The integrated SMBus interface programmability makes this part with high performance and easy design. Designer can define different power scenario for different current states to optimize the performance and efficiency.

The uP9508Q combines true differential output voltage sense, differential inductor DCR current sense, input voltage feedforward sense and adaptive voltage positioning to provide accurately regulated power for desktop CPU. It adopts uPI’s proprietary RCOT+TM (Robust Constant On-Time) topology to have fast transient response and smooth mode transition. Similar to digital based PWM controller, the loop gain is also programmable by SMBus interface to achieve design flexibility.

The uP9508Q provides system input power monitor (PSYS) ADC, VR_RDY indicator and selectable VR parameters, such as SVID VR address, SMBus device address and Vboot voltage. It also provides complete fault protection functions, including over voltage, under voltage, over current, over temperature and under voltage lockout. The uP9508Q is available in VQFN6x6 – 52L package.

• Desktop PC CPU Power Supplies