SWIFT DC/DC Buck Converters Reduce EMI

Texas Instruments recently launched the industry’s first 20-A and 30-A synchronous DC/DC buck converters with frequency synchronization for low-noise and reduced EMI/EMC and a PMBus interface for adaptive voltage scaling (AVS). The SWIFT 20-A TPS544B25 and 30-A TPS544C25 converters integrate MOSFETs and feature small PowerStack QFN packages to drive ASICs in space-constrained and power-dense applications. When used with TI’s WEBENCH online design tools, the converters simplify power conversion and speed the power supply design process. TI Swift

The highly integrated converters feature 0.5% reference-voltage accuracy, as well as full differential remote-voltage sensing. Frequency synchronization to an external clock eliminates beat noise and reduces EMI. Moreover, the TPS544B25 and TPS544C25 offer pin-strapping that enables the devices to start up without PMBus commands to an output voltage set by a single resistor. Programmability, real-time monitoring of the output voltage, current and external temperature, and fault reporting via PMBus simplify power-supply design, increase reliability, and reduce component count and system cost.

Together, the TPS544C25 and UCD90240 provide a complete PMBus point-of-load (POL) and sequencing solution. Download the Complete PMBus Power System for Enterprise Ethernet Switches TI Designs reference design.

TPS544B25 and TPS544C25 key features and benefits:

  • Integrated power MOSFETs support 20-A and 30-A of continuous output current.
  • On-chip PMBus interface and non-volatile memory simplify power-supply design and enable customization. Read a blog post on “PMBus – what is the value anyway?”
  • Voltage-control mode with input feed-forward improves noise margin and responds instantly to input voltage changes.
  • Other features include internal soft start, input under-voltage protection, thermal shutdown and a reset function.

The TPS544B25 costs $4.08 in 1,000-unit quantities. The TPS544C25 is $4.49 in 1,000-unit quantities. Evaluation modules are available.

Source: Texas Instruments