BD9400BFP

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. The I2C BUS read function can be used to send power supply overvoltage and undervoltage detection signals, as well as switching regulator output short detection signals. Features 1) The IC can be combined with the BD9401FM/BD9403FV to provide design flexibility. 2) On/off control of up to 6 outputs with I2C BUS control 3) Broad input voltage range: 7 V to 36 V 4) Built-in LDO regulator for use with microcontrollers 5) LDO regulator: 3.3 V, 250 mA (±2% precision) 6) Built-in regulator voltage detection reset circuit 7) Built-in power supply overvoltage and undervoltage detection circuits 8) Dual reference voltage sources for BD9401FM/BD9403FV (VREF, VREG), and built-in triangular waveform oscillator 9) VREF reference voltage precision: ±1% 10) The triangular waveform oscillator frequency can be changed ...