The LTC3637 features a feedback voltage reference of 0.8V with ±1% tolerance. This means that the output voltage accuracy is primarily determined by this reference and the external resistor divider used to set the output voltage.
So, the output voltage tolerance depends on:
1. The internal reference accuracy: ±1%.
2. The tolerance of the external feedback resistors: typically 1% or better is recommended for tighter regulation.
3. PCB layout and thermal effects, which can introduce minor variations.
For example, if you're using precision 1% resistors, the total output voltage tolerance could be roughly ±2% or slightly better, depending on layout and component quality.