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Power Electronics Europe News
Supply lowers power dissipation with no inductors

It takes a single positive input and generates 5.0 and 3.3V step-down supplies with high efficiency and no inductors. There is a wide 5.5 to 38V input voltage range and includes independently enabled dual outputs: a 5V 100mA supply, and a 250mA 3.3V low-dropout regulator, for a total of 350mA available output current. According to the company, this combination offers much lower power dissipation than a dual-low dropout version. For example at 12V VIN and maximum load on both outputs, power dissipation is decreased by over 2W with the supply, reducing significant heat and input current.  The supply is engineered for diagnostic coverage in ISO 26262 systems. It can be used for applications requiring low noise, low power rails from a high voltage input such as automotive ECU/CAN transceiver supplies, industrial/ telecomms housekeeping supplies, and general-purpose low-power 12 to 5.0 and 3.3V conversion.

To mazimize efficiency, the supply runs the charge pump in 2:1 mode, over as wide an operating range as possible, and automatically switches to 1:1 mode as needed, consistent with VIN and load conditions. Controlled input current and soft switching minimize conducted and radiated EMI. The device offers low quiescent current of only 20μA with both outputs regulating (no load) and 0.5µA in shutdown. The integrated watchdog timer, independent power good outputs and reset input ensure reliable system operation and enable fault monitoring. A buffered 1.1V reference output enables system self-testing diagnostics for safety critical applications. Safety features including over-current fault protection, over-temperature protection and tolerance of 38V input transients.

The power supply is available in a thermally enhanced 16-lead MSOP, with a backside thermal pad. The E- and I-grade operating junction temperature range is -40 to 125°C, the H grade operates from -40 to 150°C, and the MP grade operates from -55 to 150°C.

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