Texas Instruments TPS546D24A SWIFT™ Synchronous Buck Converter
Texas Instruments TPS546D24A SWIFT™ Synchronous Buck Converter is a highly integrated, non-isolated DC/DC converter capable of high-frequency operation and 40A current output from a 7mm×5mm package. Two, three, and four TPS546D24A devices can be interconnected to provide up to 160A on a single output. The device can overdrive the internal 5V LDO with an external 5V supply via the VDD5 pin to improve efficiency and reduce the power dissipation of the converter. The Texas Instruments TPS546D24A uses a proprietary fixed-frequency current-mode control with input feedforward and selectable internal compensation components for minimal size and stability over a wide range of output capacitances.
The PMBus interface with 1MHz clock support gives a convenient, standardized digital interface for converter configuration. It also monitors key parameters, including output voltage, current, and internal die temperature. Depending on system requirements, response to fault conditions can be set to restart, latch off, or ignore. Back-channel communication between stacked devices enables all TPS546D24A converters to power 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 also be configured through BOM selection without PMBus communication to support program-free power-up.
Features
- Split rail support: 2.95V to 16V PVIN; 2.95V to 18V AVIN (4VIN VDD5 for switching)
- Integrated 4.5mΩ/0.9mΩ MOSFETs
- Average current mode control with selectable internal compensation
- 2x, 3x, 4x stackable with current sharing up to 160A, supporting a single address per output
- Selectable 0.6V to 5.5V output via pin strap or 0.25V to 6.0V using PMBus VOUT_COMMAND
- Extensive PMBus command set with telemetry for VOUT, IOUT, and internal die temperature
- Differential remote sensing with 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 from 225kHz to 1.5MHz (8 pin-strap options)
- Frequency sync in/sync out
- Supports pre-biased output
- Supports strongly coupled inductor
- 7mm x 5mm x 1.5mm, QFN40, Pitch = 0.5mm
Applications
- Datacenter switches, rack servers
- Active antenna system, remote radio, and baseband unit
- Automated test equipment, CT, PET, and MRI
- ASIC, SoC, FPGA, DSP core, and I/O voltage
Functional Block Diagram
Related Product
Texas Instruments TPS546D24S SWIFT™ Step-Down PMBus® Converter
Highly integrated with manufacturer-specific PMBus commands and extended write protect and Passkey.
Related Development Tool
Texas Instruments TPS546D24AEVM-2PH Converter Evaluation Module
Demonstrates the stacking operation of TPS546D24A in a two-phase, low-output voltage application.