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Multiple Phase Buck Controller

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uP1674

3/2-Phase SDPWM Controller with SMBus for VR12

Datasheets PDF

General Description

The uP1674 is a Simulated Digital PWM controller that integrates a 3/2-phase PWM controller. uP1674 accurately reports output voltages and output currents to comply with VR12 specification. The uP1674 integrates 2 bootstrapped drivers that support 12V + 12V driving capability. 3/2 phase operation is enabled by a logic level PWM output, achieving optimal balance between cost and flexibility. The uP1674 supports phase adding/dropping that is activated by PSI command from SVID or by PS state from SMBUS. The uP1674 operates in diode emulation mode at extreme light load condition and achieves maximum efficiency over entire load current range.

Other features include adjustable soft start, transient boost function, under/over voltage protection and over current protection. The uP1674 is available in VQFN5x5-32L package.

Pin Configuration & Typical Application Circuit

Feature

  • Intel VR12/IMVP7 Compliant
    • IOUT and VOUT Reporting
    • Programmable IMAX, VBOOT, and SVID/SMBUS Address
  • Selectable 3/2 Phase Operation
  • RCOTTM Control Topology
    • Easy Setting
    • Smooth Mode Transition
    • Fast Transient Response
  • Simulated Digital PWM Control
  • Transient Boost Technology
  • High Accuracy DAC
  • Programmable Operation Frequency
  • Adjustable Soft-Start
  • OCP/UVP/OVP
  • RoHS Compliant and Halogen Free

Application

  • Desktop and Notebook PC Core Power Supplies