The solution includes the RAA271050, a 42V synchronous buck ‘pre-regulator’ that accepts the vehicle’s 12V supply and steps it down to an intermediate supply voltage of 3.3V or 5.0V.
The RAA271000, a seven-channel PMIC (power management IC), then takes the RAA271050’s output and steps it down further to the various supply voltages needed by R-Car V3H and its peripherals such as LPDDR4 memory.
Both devices have been developed in accordance with the ISO-26262 standard, and can support system safety requirements up to ASIL D and the solution has been designed to satisfy all the power and functional safety requirements for the R-Car V3H. It provides supply voltages with the current capability to meet all power specifications, including sequence, voltage accuracy, and load step response. For safety, it provides all the necessary power and digital monitoring functions.
Renesas’ new solution provides power loss reductions of up to 33 percent compared to competitive PMICs under comparable operating conditions. Lower power loss enables operation at higher temperatures, reducing cooling costs and delivering better reliability.
In addition, the RAA271050 and RAA271000 were designed to match R-Car requirements with no unnecessary overhead, reducing component cost and PCB area. Renesas is providing a reference hardware solution that includes the new components, speeding design time and reducing testing requirements for customers.
