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uP9521R

Dual Output 4+3-Phase PWM Controller with SMBus Digital Interface Control for IMVP8

Datasheets PDF

General Description

The uP9521R is an IMVP8 compliant desktop CPU voltage regulator controller that integrates a 4-phase PWM controller for Vcore and a 3-phase PWM controller for VccGT. The Vcore controller can be configured as 4/3/2/1-phase and the VccGT controller can be configured as 3/2/1-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 uP9521R combines the 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 uP9521R provides the VR_RDY indicator and selectable VR parameters, such as SMBus device address and Vboot voltage. It also provides complete fault protection functions, including over voltage, under voltage, over current and under voltage lockout. The uP9521R is available in VQFN6x6 – 52L package.

Pin Configuration & Typical Application Circuit


4+3 Phase

4+2 Phase

5+2 Phase

6+1 Phase

Feature

  • Intel® IMVP8 Compatible
    • Support S-Line Desktop CPU
    • Thermal Sense with VRHOT# Indication
  • RCOT+TM Control Topology
    • Easy Setting
    • Smooth Mode Transition
    • Fast Transition Response
  • External MOSFET Driver Enable Control
  • Support Operation Phase Disable Function
    • Vcore: 4/3/2/1-Phase PWM Outputs
    • VccGT: 3/2/1-Phase PWM Outputs
  • Built-in ADC for Platform Parameter Setting
    • Selectable SMBus Device Address
    • Selectable Vboot Voltage
    • Operation Phase Extension Function
  • SMBus Interface for Performance and Efficiency Optimization
    • Dynamic Programmable VR Parameters
    • Programmable Protection Thresholds
    • VR Output Reporting
    • Programmable Loop Gain
  • Enable Control and VR_RDY Indicator
  • System Thermal Management
  • Differential Remote Voltage Sense
  • Differential Current Balance Sense Amplifier
  • OCP/OVP/UVP
  • RoHS Compliant and Halogen Free

Application

  • Desktop PC CPU Power Supplies