Texas Instruments

TPS546D24A Stackable 40 A SWIFT™ Synchronous Buck Converter

Texas Instruments' 2.95 V to 16 V input PMBus® converter uses a fixed-frequency, proprietary current-mode control

Image of Texas Instruments' TPS546D24A SWIFT™ Synchronous Buck ConverterTexas Instruments' TPS546D24A is a highly integrated, non-isolated DC/DC converter capable of high-frequency operation and 40 A current output from a 7 mm × 5 mm package. Two, three, and four TPS546D24A devices can be interconnected to provide up to 160 A on a single output. The device has an option to overdrive the internal 5 V LDO with an external 5 V supply via the VDD5 pin to improve efficiency and reduce the power dissipation of the converter. The device uses a proprietary fixed-frequency current-mode control with input feed-forward and selectable internal compensation components for minimal size and stability over a wide range of output capacitance.

The PMBus interface with 1 MHz clock support gives a convenient, standardized digital interface for converter configuration and monitoring of key parameters including output voltage, output current, and internal die temperature. Response to fault conditions can be set to restart, latch off, or ignore, depending on the system requirements. Back-channel communication between stacked devices enables the TPS546D24A converters powering a single output rail to share a single address, simplifying the system software/firmware design. Key parameters including output voltage, switching frequency, soft-start time, and overcurrent fault limits can be configured through BOM selection without PMBus communication to support program free power-up.

Features
  • Split rail support: 2.95 VPVIN to 16 VPVIN, 2.95 VAVIN to 18 VAVIN (4 VIN VDD5 for switching)
  • Integrated 4.5 mΩ / 0.9 mΩ MOSFETs
  • Average current-mode control with selectable internal compensation
  • 2x, 3x, and 4x stackable with current sharing up to 160 A, supporting a single address per output
  • Selectable 0.6 V to 5.5 V output via pin strap or 0.25 V to 6.0 V using PMBus VOUT command
  • Extensive PMBus command set with telemetry for VOUT, IOUT, and internal die temperature
  • Differential remote sensing with an internal FB divider for <1% VOUT error -40°C to +150°C TJ
  • AVS and margining capabilities through PMBus
  • MSEL pins pin programming PMBus defaults
  • 12 selectable switching frequencies: 225 kHz to 1.5 MHz (Eight pin-strap options)
  • Frequency sync in/sync out
  • Supports a pre-biased output
  • Supports a strongly coupled inductor
  • Package: 7 mm × 5 mm × 1.5 mm, 0.5 mm pitch, 40-pin QFN
Applications
  • Datacenter switches and rack servers
  • Active antenna systems, remote radios, and baseband units
  • Automated test equipment: CT, PET, and MRI
  • ASIC, SoC, FPGA, DSP core, and I/O voltage

TPS546D24A SWIFT™ Synchronous Buck Converter

ImageManufacturer Part NumberDescriptionOutput ConfigurationTopologyOutput TypeAvailable QuantityPriceView Details
IC REG BUCK ADJ 40A 40LQFNTPS546D24ARVFRIC REG BUCK ADJ 40A 40LQFNPositiveBuckAdjustable12329 - Immediate$8.38View Details

Evaluation Board

ImageManufacturer Part NumberDescriptionOutputs and TypePower - OutputVoltage - OutputAvailable QuantityPriceView Details
EVAL BOARD FOR TPS546D24ATPS546D24AEVM-2PHEVAL BOARD FOR TPS546D24A1 Non-Isolated Output-0.8V5 - Immediate$91.16View Details
Published: 2020-04-27

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