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High Efficiency, 28V Input Single Inductor Synchronous Step Up/Down Regulator


  • The SY9228 is a high voltage buck-boost converter for USB power delivery applications. With userselectable source mode and sink mode, it features bidirectional power delivery. In source mode, the output voltage VVBUS can be controlled in 0.1V per step from 3.6V to 21V. In sink mode, the output voltage VBAT is adjustable with an external resistor divider. The four integrated low RDS(on) switches minimize the conduction loss. The SY9228 integrates an I2C compatible interface for mode selecting, output voltage setting, frequency setting, protection setting, and etc. The device is available in compact QFN5×5-32 package.

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