12A synchronous buck regulator with PMBus interface

18th March 2014
Nat Bowers

Featuring a tiny PowerStack QFN package and integrated NexFET MOSFETs, the SWIFT TPS53915 converter drives ASICs in space-constrained and power-dense applications in including wired and wireless communications, enterprise/cloud computing and storage systems. TI claim that this is the industry’s smallest 12A, synchronous DC/DC buck converter with PMBus interface.

When used in conjunction with TI's award-winning WEBENCH online design tools, the TPS53915 simplifies power conversion and speeds the design process. The highly integrated converter features 0.5% reference voltage accuracy to meet voltage requirements of deep sub-micron processors. D-CAP3 adaptive on-time control mode is easy to use, provides very fast load transient response and reduces external component count. Programmability and fault reporting via PMBus simplifies power supply design and further reduces component count.

The TPS53915 features an on-chip PMBus interface to simplify power supply design and an auto-skipping Eco-mode to provide high light-load efficiency. The 28-pin, 3.5x4.5x1mm PowerStack QFN package features TI's NexFET power MOSFETs stacked on a grounded lead frame and connected using copper clips. The unique combination of stacking and bonding allows for a smaller, more integrated quad flat no-lead (QFN) package compared to other solutions that place MOSFETs side by side.

Other features include no external compensation, internal soft start, input under-voltage protection, internal bootstrap capacitor and thermal shutdown.

The TPS53915 DC/DC converter is available in volume now from TI and authorised distributors. It is  priced at $3.51 (USD) in 1,000 unit quantities.

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