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TECHNICAL NOTE
System Power Supply LSIs for use in automotive electronics
System Power Supply IC with Connunication Function (Master Type)
BD9400BFP
Description The BD9400BFP can be combined with the BD9401FM/BD9403FV to create application-specific system power supplies. It can be controlled using an I2C BUS. The BD9400BFP is a main control chip featuring an I2C BUS bidirectional communications function, a VDD LDO (for microcontroller use), a VDD reset, and BD9401FM/BD9403FV control circuits. The IC's I2C BUS communications function allows switching regulator and high-side switch on/off control, as well as switching regulator frequency adjustment, using a maximum of 3 channels.