TPS546C23 Stackable Synchronous Buck Converter

By Texas Instruments 46

TPS546C23 Stackable Synchronous Buck Converter

Texas Instruments' TPS546C23 devices are PMBus 1.3 compliant, non-isolated DC-DC converters with integrated FETs, capable of high-frequency operation and 35 A current output from a 5 mm x 7 mm package. Two TPS546C23 devices can be paralleled together to provide up to 70 A load. Current sensing is realized by sampling a small portion of the power stage current and independent on the device temperature. High-frequency, low-loss switching, provided by an integrated NexFET™ power stage and optimized drivers, allows for very high-density power solutions. The PMBus interface enables the AVS functions through VOUT_COMMAND, flexible converter configuration, as well as key parameters monitoring, including output voltage, current, and internal die temperature. Response to fault conditions can be set to either restart, latch-off, or ignore depending on system requirements.

Features
  • PMBus 1.3 compliant converters: 35 A
  • 2-device stackable for up to 70 A with current sharing
  • Input voltage range: 4.5 V to 18 V
  • Output voltage range: 0.35 V to 5.5 V
  • 5 mm x 7 mm LQFN package
  • Single thermal pad
  • Integrated 3.2 mΩ and 1.4 mΩ stacked NexFET power stage
  • 350 mV to 1650 mV reference for adaptive voltage scaling (AVS) function and margining through PMBus
  • 0.5% reference accuracy at 600 mV and above
  • Lossless low-side MOSFET current sensing
  • Voltage mode control with input feed-forward
  • Differential remote sensing
  • Monotonic start-up into pre-biased output
  • Output voltage and output current reporting
  • Internal die temperature monitoring
  • 64 programmable PMBus addresses via ADDR0 and ADDR1 pins
  • Programmable via the PMBus interface
  • VOUT_COMMAND and AVS VOUT transition rate
  • Overcurrent protection with thermal compensation
  • UVLO, soft-start, and soft-stop
  • PGOOD, OV, UV, and OT levels
  • Fault responses
  • Turn-on and turn-off delays
  • Thermal shutdown
  • Pin strapping for switching frequency: 200 kHz to 1 MHz
  • Frequency synchronization to an external clock or output clock to sync out

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