Automotive Infotainment Power Solution

Application

Description

This automotive power solution provides all necessary voltage rails for modern infotainment systems. It features load dump protection, wide input voltage range for cold crank conditions, and multiple regulated outputs for processors, displays, and peripherals. All components are AEC-Q100 qualified.

Core Advantages

AEC-Q100 qualified components for automotive reliability
Load dump protection up to 40V transient
Cold crank operation down to 4.5V input
Multiple regulated rails for system power
Comprehensive diagnostics and protection

Recommended Bill of Materials (BOM)

Item Part Number Description Quantity Datasheet
1 JW5359 Synchronous Buck Converter (AEC-Q100) 1 📄 Download
2 JW5060 High-Current Buck Converter (AEC-Q100) 1 📄 Download
3 JW5220 High PSRR LDO (AEC-Q100) 2 📄 Download
4 JW5116 Gate Driver (AEC-Q100) 1 📄 Download
5 4.7μH 6A Inductor, 4.7μH, 6A, Shielded 1 📄 Download
6 2.2μH 10A Inductor, 2.2μH, 10A, Shielded 2 📄 Download
7 22μF 50V Ceramic Capacitor, 22μF, 50V, X7R 10 📄 Download
8 TVS 40V TVS Diode, 40V, Load Dump Protection 1 📄 Download

Applications

Head units
Rear seat entertainment
Digital instrument clusters
Telematics systems
ADAS processors

Technical Specifications

Input Voltage
4.5V - 40V (load dump protected)
Output Rails
5V, 3.3V, 1.8V, 1.2V
Total Power
Up to 50W
Efficiency
Up to 95%
Qualification
AEC-Q100 Grade 2
Operating Temperature
-40°C to +105°C
Load Dump
ISO 16750-2 compliant
E M C
CISPR 25 Class 5

Customer Success Stories

AutoTech Infotainment

Automotive Electronics | Head Unit Power

Challenge

Required automotive-qualified power solution for next-generation head unit with multiple processors and strict EMC requirements.

Solution

Implemented JoulWatt automotive power solution with AEC-Q100 qualified components and comprehensive load dump protection.

Results

Passed all automotive qualification tests including load dump, cold crank, and EMC. System operates reliably across full automotive temperature range.

DriveSafe Systems

Automotive Safety | ADAS Processor Power

Challenge

Needed high-reliability power supply for ADAS processor with multiple voltage rails and fast transient response.

Solution

Designed multi-rail power system using JW5359 and JW5060 with JW5220 LDOs for sensitive analog circuits.

Results

Achieved excellent transient response for processor load steps. System qualified for ASIL-B safety level. Deployed in production vehicles.

FAE Expert Insights

R

Robert Zhang

Senior FAE - Automotive Power

12 years

Professional Insights

Key considerations: Wide input range eliminates need for separate protection circuits; AEC-Q100 qualification is mandatory for automotive applications; Fast transient response critical for processor power; Thermal management crucial in compact automotive enclosures. Common pitfalls to avoid: Insufficient load dump protection causing component damage; Inadequate cold crank voltage hold-up; Poor thermal design leading to overtemperature shutdowns; Missing AEC-Q100 qualification for automotive use.

Key Takeaways

  • Wide input range eliminates need for separate protection circuits
  • AEC-Q100 qualification is mandatory for automotive applications
  • Fast transient response critical for processor power
  • Thermal management crucial in compact automotive enclosures

Decision Framework

Decision Framework
Steps:
  1. Evaluate requirements
  2. Compare solutions
  3. Consult FAE

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Frequently Asked Questions

Are all components AEC-Q100 qualified?

Yes, all JoulWatt components in this solution (JW5359, JW5060, JW5220, JW5116) are available in AEC-Q100 qualified versions. Ensure you order the automotive grade variants which are tested and qualified for automotive temperature range and reliability requirements.

All components AEC-Q100 qualified; order automotive grade variants explicitly.

What is load dump protection?

Load dump is a transient condition where the alternator generates a high voltage spike (up to 40V) when the battery is disconnected while the engine is running. This solution includes TVS protection and the JW5359's wide input range (up to 40V) to survive these transients without damage.

TVS + wide input range (40V) protects against load dump; ISO 16750-2 compliant.

What is cold crank operation?

Cold crank occurs when starting the engine, causing battery voltage to drop as low as 4.5V for short periods. The JW5359 operates down to 4.5V input, ensuring continuous operation during cold crank conditions. This eliminates the need for backup power or hold-up circuits.

4.5V minimum input handles cold crank; no backup power needed.

What is the operating temperature range?

The solution operates from -40°C to +105°C ambient (AEC-Q100 Grade 2). This covers the full automotive temperature range including extreme cold starts and hot engine compartment conditions. Proper thermal management is required at high temperatures.

-40°C to +105°C Grade 2; covers full automotive temperature range.

Does this solution meet automotive EMC requirements?

The solution is designed to meet CISPR 25 Class 5 EMC requirements for automotive applications. Proper PCB layout, shielded inductors, and input filtering are essential. Pre-compliance testing and potential design iterations are recommended for final EMC certification.

Designed for CISPR 25 Class 5; proper layout and shielding essential.

Can this solution support ASIL functional safety requirements?

The power architecture supports ASIL applications when combined with appropriate monitoring and safety mechanisms. The converters provide power-good indicators for voltage monitoring. For higher ASIL levels (C/D), additional external monitoring and redundancy may be required.

Supports ASIL with monitoring; higher ASIL may need additional redundancy.