New automotive designs are adopting 48V power systems in order to reduce power loss in the vehicle’s cable harnesses and reduce their weight. However, this presents a challenge when trying to comply with EMC regulations. Success is possible through thoughtful component placement and PCB layout, together with techniques like frequency spread-spectrum (FSS).

This reference design showcases a 48V to 12V buck converter, capable of delivering 15A of current and complying with CISPR-25 Class 5 EMC standard.

• AEC-Q100 Qualified
• Wide 4V to 60V Operating Input Range
• Dual N-Channel MOSFET Driver
• 0.8V Voltage Reference with ±1.5% Accuracy Over Temperature
• Low Dropout Operation: Maximum Duty Cycle at 99.5%
• Programmable Frequency Range: 100kHz – 1000kHz
• External Sync Clock Range: 100kHz – 1000kHz
• 180º Out-of-Phase SYNCO Pin
• Programmable Soft Start (SS)
• Power Good (PG) Output Voltage Monitor
• Selectable Cycle-by-Cycle Current Limit
• Output Over-Voltage Protection (OVP)
• Over-Current Protection (OCP)
• Internal LDO with External Power Supply Option
• Programmable Forced CCM and AAM
• Available in TSSOP20-EP and QFN-20 (3mmx4mm) Packages
• Available in a Wettable Flank Package
• External Frequency Spread-Spectrum modulation (FSS)
• External Input Over-Voltage Protection (OVP)
• External Reverse-Polarity Protection (RPP)

Buck converter with 48V nominal input, 12V 15A output capability, input EMI filter, RPP and OVP, FSS modulation.

• Automotive Power Systems
• Industrial Systems

Courtesy: https://www.monolithicpower.com/en/reference-design-mpq2908-automotive-systems