Bob K: indeed. This actually happened to me recently: the (ceramic) input capacitor was ringing so badly due to the inductance of a long power supply cable that the switcher was experiencing a significant overvoltage at switch-on. I have never seen this phenomenon given adequate treatment in data sheets or application notes.
What would be a big help is a discussion of how the ESR of the bulk capacitor can be use to control the Q of the input filter. The drawing show an input inductor with VIN on the input side. Since a buck converter exhibits negative resistance the input filter can easily "Ring". This frequency can be quite low, down to 10Ks of Hz and the VIN source can be low Z at low frequencies. Load power transients at the resonate frequency can produce high ringing voltages that can blow the power FET or IC. Worse yet many of these little converters are mounted on a PCB with plenty of bypass caps. That makes a the Z of VIN even lower, the Q higher, and ringing worse.
Designing an input filter that has a low Q for any input Z is difficult. This task is impossible for "Digital Engineers" schooled only in digital design.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.