DC/DC converters with size and cost reductions

27th November 2020
Alex Lynn

Silanna Semiconductor has announced the launch of their newest family of wide voltage, high-frequency point of load DC/DC converters targeting USB-PD applications.  Silanna Semiconductor focuses on ultimate Power Management challenges with best in class power density and efficiency performance that brings BoM savings.   

SZPL3102A/3103A family of two DC/DC converters (Buck Regulators) operate up to 2MHz.  Delivering wide input and output range converters that support up to 24VDC input in a tiny 3x3mm QFN.  

Tim Wilhelm, Director of Marketing, explained: “Higher switching frequency means a smaller, lower cost output filter that has delighted the clients we have sampled.  The SZPL3102/3103 have ground-breaking efficiencies in the smallest size and weight designs. Our support tools give customers the flexibility and confidence to quickly increase the performance efficiency which ultimately increases the power density in their designs approaching 12% of the volume required by low-frequency competitive solutions.  The SZPL3102/3103 significantly reduce BOM cost, design cycles and time to market.”  

The SZPL3102A and SZPL3103A have features that optimise their performance in USB port power supply applications. Extremely low operating power dissipation enables very low no-load power that is an important specification for regulatory certification. Furthermore, the SZPL3102A contains a momentary internal feedback path that allows for clean and well controlled start-up operation until external USB-PD controllers can bias themselves and take over control of the output voltage.  

“At Silanna Semiconductor we have the mantra ‘Power Management Re-Imagined’ and this family of DC/DC converters is one more example, we approached the size cost challenge completely differently than our competitors,” said Mark Drucker, CEO of Silanna Semiconductor. “Our design team increased the frequency to 2MHz and maintained the highest efficiency and power density which allowed unheard of size and cost reductions.  We are witnessing some fantastic customer reactions, which have resulted in a great deal of early design wins particularly in USB-PD applications.”  

Silanna incorporated internal and external Resistor Divider flexibility for custom design support.  The SZPL3102 Includes a momentary internal FB Resistor Divider that allows time for some PD controllers to power up and take smooth control.  The SZPL3103 allows for an external FB Resistor divider for stand-alone operation and co-operation with other USB port controllers using an external divider network. 

Key features:  

  • Optimal for USB PD and fast charging 
  • 18, 27, 45 and up to 65W PD-ports  
  • Up to 2MHz switching frequency for compact designs
  • 3.3 to 21V output at 3.25A (covers USB-PD 3.0 and PPS applications) 
  • Eight to 27V input    
  • Dual input LDOs (VIN and VOUT) for product bias optimises overall efficiency  
  • Space saving 3x3mm QFN package   

 Key applications  

  • USB-PD and fast charging power adapters 
  • High power density DC/DC power supplies 
  • High efficiency power adapters 
  • Battery chargers for mobile devices  

SZPL3102A/3103A family are being sampled to key accounts and will be fully released later this year.

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