Power Input and Supply Requirements

Solution focus

Power source, known input range and the supply needs of different functions are basic inputs for a circuit board solution discussion.

Engineering basis

TI power-layout guidance shows that the placement of input capacitors, power devices and ground return paths affects parasitics, stability and noise, so nominal voltage alone is not enough for a design handoff.

Design focus

• Separate external input, conversion rails and sensitive analog rails
• List input range, polarity, protection and startup conditions
• Document voltage rails, peak loads and power-up relationships

Recommended information

• Power source and connector
• Known input range
• Supply needs of different functional sections

Handoff and verification

• Power-tree or rail list
• Input connector and protection requirements
• Load, power-up and open-condition notes

Next collaboration step

After the information for power input and supply requirements is confirmed, align the functional, interface, material, assembly and revision information before the next solution discussion.