Home > ST’s patented diode technology makes battery chargers faster and smaller

ST’s patented diode technology makes battery chargers faster and smaller

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article image ST’s FERD diodes enable designers of battery chargers and notebook adaptors to meet stringent energy-efficiency standard requirements

STMicroelectronics Pty Ltd has introduced a new family of Field-Effect Rectifier Diodes (FERD) designed to offer a unique trade-off between low forward voltage drop (VF) and low leakage current (IR), enabling designers of battery chargers and notebook adaptors to meet stringent energy-efficiency standard requirements without the expense of using synchronous rectification techniques.

Standards such as Energy Star 6.0 test the limit of what can be achieved with conventional Schottky diodes in battery chargers and notebook adaptors. Synchronous rectification provides superior performance but at significantly greater cost.

Providing an attractive alternative, the ST FERD diode family meets the efficiency levels required by the energy-savings standards applicable to off-line Switch Mode Power Supplies while costing about 30% less than a synchronous rectification kit.

Available in ranges from 15A to 2x30A and from 45V to 60V, the FERD diodes are based on a patented ST technology that achieves best-in-class VF/IR for a given silicon surface area.

With its lower forward voltage drop and better managed leakage current, the ST technology increases the current that can flow for a given package power-dissipation capability. Benefits include faster charging of smart phones and tablets, reduced notebook charger size and weight, and increased lifetime of the equipment as the FERD diodes operate at a lower temperature.

The FERD technology is also well suited for applications and systems in segments such as freewheeling or reverse battery protection in automotive applications; OR-ing in telecom power supplies; or rectification in industrial systems. It could also be offered in FERD devices with various voltage and current ratings to support the needs of the different markets. 

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