System Level reference design for 30W ADAS system with required Automotive Protections

PMP10652 is a System optimized (CISPR 25 Class 3) 30W design for Surround View ADAS system.

The design has various protections such as Load dump through TVS (ISO pulse testing), Reverse Voltage (Innovative Smart diode with very low Iq), Battery Disconnect Switch with OVP protection (PFET) and is EMI optimized to meet Conductive EMI limits of CISPR25 Class3 (overall) and Class5 upto 30MHz Range.

Input voltage range is between 4.5V to 30V with OVP at 20V and hence will operate in most Cold Cranking conditions.

LM74610 is used for Battery reverse protection which utilizes a charge pump to drive an N-channel FET to provide a resistive path for the bypass current to flow. LM53603Q1 is used as front end DC/DC Buck converter which is 2.2MHz switching, Synchronous rectified Wide Vin Buck Converter which can take transient upto 42V. TPS57114Q1 is used to provide power to the cores and it is a high current 2,2MHz switching buck converter. LM26420 is a dual 2.2MHz switching buck converter which is used for generating other required supplies.

LM3880 sequencer is used for all the power up and power down sequencing requirements. 

Features

• Designed for most Cold Crank and Start Stop conditions
• In compliance with the ISO pulse test / CISPR 25 Class 3 conducted emissions standard, passing both AM & FM radio band tests
• All devices Switching frequency at 2.1MHz (AM Band Avoidance)
• Reverse Protection through Smart diode
• Series Fault protection FET with OVP
• Power up and Power Down sequencing through integrated sequencer

Parts Include:

LM26420-Q1  Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator 
LM3880          Power Supply Sequencer 
LM53603-Q1   Zero Iq Reverse Polarity Protection Smart Diode Controller
LM74610-Q1  Low-Voltage Adjustable Precision Shunt Regulator 
TPS57114-Q1  Automotive 2.95V to 6V Input, 4A, 2MHz Synchronous Step-Down SWIFT™ DCDC Converter  
TPS60150       140mA, 5V Charge Pump in 2×2 SON 
TPS717          Single Output LDO, 150mA, Fixed (3.0V), High PSRR, Low Quiescent Current, Low Noise

Learn more by downloading the reference design below