FTM Board Club
Rohm
REFRPT001-EVK-001
CISPR25 Class5 compliant 8 rails power tree Reference Design for Automotive ADAS/Infotainment application

This reference design is a power tree solution board developed for infotainment devices such as automotive clusters and center information displays and for ECUs for ADAS application.

The power system that can support functional safety is integrated on a single board to achieve the optimal configuration as a power tree. Excellent EMC performance that meets CISPR25 Class 5 even at all power supply rails are enabled, and reduces heat generation of each device by distributing high-efficiency DCDCs. In addition, two supervisor ICs with self-diagnosis functions can monitor the output of all power rails and contribute to a higher level of functional safety.

These parts are on the evaluation board:

Part No.SpecificationsPower Supply Configuration in the REFRPT001-EVK-001
Vin [V]Vout [V]Iout [A]
BD9P105EFV-C For Automotive 3.5V to 40V Input,
1A Single 2.2MHz Buck DC/DC Converter
9.0~16.0 5.0 1.0
BD9S201NUX-C For Automotive 2.7V to 5.5V Input,
2A Single Synchronous Buck DC/DC Converter
(Internal 5.0V) 1.25 1.25
BD00IA5MEFJ-M For Automotive 0.5A,
0.8~4.5V Variable Output LDO Regulator
(Internal 5.0V) 3.3 0.2
BD9P205EFV-C For Automotive 3.5V to 40V Input,
2A Single 2.2MHz Buck DC/DC Converter
9.0~16.0 3.3 2.0
BD9S400MUF-C For Automotive 2.7V to 5.5V Input,
4A Integrated MOSFET Single Synchronous Buck DC/DC Converter
(Internal 3.3V) 1.0 1.5
BD9S300MUF-C For Automotive 2.7V to 5.5V Input,
3A Integrated MOSFET Single Synchronous Buck DC/DC Converter
(Internal 3.3V) 1.5 1.0
BD9S201NUX-C For Automotive 2.7V to 5.5V Input,
2A Single Synchronous Buck DC/DC Converter
(Internal 3.3V) 1.8 0.5
RV4C020ZPHZG 20V, 2A Pch MOSFET (Internal 3.3V) 3.3 0.15
RBR3LAM60BTF For Automotive
Low VF, 60V, 3A, SOD-128, Schottky Barrier Diode
9.0~16.0 - -
BD39040MUF-C For Automotive
System Power Good + Watchdog Timer + Reset
(Internal 5.0V) - -
BD39040MUF-C For Automotive
System Power Good + Watchdog Timer + Reset
(Internal 3.3V) - -

 

Features
  • Automotive Infotainment/ADAS 8-channels power tree reference design
  • Verified to satisfy EMC CISPR 25 class 5 standard without common mode filter
  • In order to avoid the AM radio frequency bands All DC/DC converters operate at a switching frequency of 2.2 MHz or higher.
  • Thermal characteristics tested
  • voltage monitoring for 8-channel power tree to improve the functional safety ASIL level
  • Space saving by integrating multiple power trees