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Dual-Channel 6+2/5+3 D-CAP+TM Multiphase Step-Down Controller with PMBus and NVM


Package | PIN: RSB | 40
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $10.31
10-24 $9.27
25-99 $8.66
100-249 $7.77
250-499 $7.25
500-749 $6.31
750-999 $5.46
1000+ $5.35


  • 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
  • Configurable with Non-Volatile Memory (NVM) for Low External Component Counts
  • Individual Phase Current Calibrations and Reports
  • Dynamic Phase Shedding with Programmable Current Threshold for Optimizing Efficiency at Light and Heavy Loads
  • Fast Phase-Adding for Undershoot Reduction (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 × 5 mm, 40-Pin, QFN PowerPad™ Package

All trademarks are the property of their respective owners.

Texas Instruments  TPS53681RSBT

The TPS53681 is a multiphase step-down controller with dual channels,built-in non-volatile memory (NVM), and PMBus™ interface, and isfully compatible with TI NexFET ™power stage. Advanced controlfeatures such as D-CAP+™ architecture with undershoot reduction(USR) provide fast transient response, low output capacitance, and high efficiency. The device alsoprovides novel phase interleaving strategy and dynamic phase shedding for efficiency improvement atdifferent loads. The device supports fast dynamic voltage transitions with adjustable slew rate. Inaddition, the device supports the PMBus communication interface for reporting the telemetry ofvoltage, current, power, temperature, and fault conditions to the systems. All programmableparameters can be configured by the PMBus interface and can be stored in NVM as the new defaultvalues to minimize the external component count.

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