TPS53681 Multiphase Step-Down Controller

TPS53681 Multiphase Step-Down Controller

Texas Instruments' TPS53681 is a multiphase step-down controller with dual channels, built-in non-volatile memory (NVM), and PMBus interface, and is fully compatible with TI NexFET™ power stage. Advanced control features such as D-CAP+ architecture with undershoot reduction (USR) provide fast transient response, low output capacitance, and high efficiency. The device also provides novel phase interleaving strategy and dynamic phase shedding for efficiency improvement at different loads. The device supports fast dynamic voltage transitions with adjustable slew rate. In addition, the device supports the PMBus communication interface for reporting the telemetry of voltage, current, power, temperature, and fault conditions to the systems. All programmable parameters can be configured by the PMBus interface and can be stored in NVM as the new default values to minimize the external component count.

The TPS53681 device is offered in a thermally enhanced 40-pin QFN packaged and is rated to operate from -40°C to +125°C.

  • Conversion input voltage range: 4.5 V to 17 V
  • 8-bit DAC with selectable 5 mV or 10 mV resolution and output ranges from 0.25 V to
  • 1.52 V or 0.5 to 2.8125 V for dual channels
  • Phase configurations
    • Maximum (6-phase + 2-phase) or (5-phase + 3-phase)
    • Minimum (1-phase + 1-phase)
  • Driverless configuration for efficient high-frequency switching 
  • Dynamic output voltage transitions with programmable slew rates via PMBus interface
  • Frequency selections with closed-loop frequency control: 300 kHz to 1 MHz 
  • Programmable internal loop compensations
  • Individual phase current calibrations and reports 
  • Configurable with NVM for low external component counts 
  • Dynamic phase shedding with programmable current threshold for optimizing
  • Efficiency at light and heavy loads 
  • Fast phase-adding for USR
  • Fully compatible with TI NexFET power stage for high-density solutions
  • Accurate, adjustable voltage positioning 
  • Patented AutoBalance™ phase balancing 
  • Selectable, 16-level per-phase current limit 
  • PMBus system interface for telemetry of voltage, current, power, temperature, and fault conditions 
  • Low quiescent current 
  • 5 mm x 5 mm, 40-pin, QFN PowerPad™ package
  • ASIC needs dual power rails
  • High-performance processor power
  • Networking processor power (Broadcom®, Cavium®)
  • High-current FPGA power (Intel®, Xilinx®)
  • High-performance ARM® processor power

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