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Multiple Phase Buck Controller

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uP9556

4/3/2/1-Phase Synchronous-Rectified Buck Controller for GPU Power Supply

Datasheets PDF

General Description

The uP9556 is a 4/3/2/1-phase PWM controller specifically designed to work with VDD=5V, input voltage VIN=3V to 20V to deliver high quality output voltage for high performance graphic processor power. This part is designed to be paired with DrMOS module or smart power stage (SPS) for maximum application flexibility.
The uP9556 supports NVIDIA Open Voltage Regulator Type-4-22 with PWMVID interface. The PWMVID input is buffered and filtered to generate accurate reference voltage and the output voltage is precisely regulated to the reference input. The device adopts uPI’s proprietary RCOT+TM (Robust Constant On-Time) technology to have fast transient response and smooth operation mode transition. The power saving input (PSI) is designed with updated off states, which allow the graphic processor to control the voltage regulator more efficiently.
The uP9556 supports three types of phase current sense technique: low-side MOSFET RDS(ON) current sensing, lossless inductor DCR current sensing, and smart power stage (SPS) IMON current sensing. Other features include adjustable switching frequency, adjustable Vout soft start slope, total output current limit, under voltage protection, over voltage protection, power good indication and the input for thermal protection. The uP9556 is available in a WQFN4x4-32L package.

Pin Configuration & Typical Application Circuit

WQFN4x4-32L

Note
  1. Package Outline Unit Description:
    • MIN: Minimum dimension specified.
    • NOM: Nominal. Provided as a general value.
    • MAX: Maximum dimension specified.
    • BSC: Basic. Represents theoretical exact dimension or dimension target.
    • REF: Reference. Represents dimension for reference use only. This value is not a device specification.
  2. Dimensions in Millimeters.
  3. Drawing not to scale.
  4. These dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.15mm.

Feature

  • Support NVIDIA Open VReg Type-4-22 with PWMVID Interface
  • Flexible 4/3/2/1 Operation Phase Configuration
  • Support Up to 1MHz Operation Frequency
  • Support DrMOS and SPS Application
  • Support MOSFET RDS(ON), Inductor DCR, and SPS IMON Current Sensing Application
  • Total Output Current Limit
  • Support Output Voltage Active Discharge
  • Power Saving Input with Updated off States
  • Support Auto-Phase Shedding Operation
  • OVP, UVP, THWRN# for Thermal Protection
  • RoHS Compliant and Halogen Free

Application

  • Middle-High End GPU Core Power Supplies
  • Graphic Card Memory Power Supplies