Microsoft recently published a great piece on why microfluidics are the future of liquid cooling for AI chips. They rightly point out that to handle massive Neural Processing Units (NPUs), the industry has to get the cooling fluid directly to the silicon.
We completely agree: liquid cooling is the definitive solution for AI. But here is the catch—AI isn't staying in the datacenter.
Edge AI is bringing heavy, datacenter-level workloads directly into smartphones, laptops, and smart glasses. If consumer devices are going to run these intensive local AI models, they need serious Edge AI thermal management.
This creates a massive engineering disconnect. The current liquid cooling technology used for server racks is simply not built for consumer devices. You can build the most advanced microchannels in the world to cool a mobile chip, but you still need a way to push fluid through them without ruining the form factor.
I asked Cedric Leclerc, our liquid cooling expert at Boréas Technologies, for his take on the shift toward micropump liquid cooling. Here is why he argues that piezo-actuation is the only practical way to scale this technology down for consumer hardware.
1. Mechanical pumps simply don't fit
The biggest issue with direct-to-chip cooling in consumer devices is stack height. You cannot cram standard pumps into a 7mm thick smartphone or a pair of AR glasses.
When designing high TDP cooling compact devices, you urgently need reliable alternatives to passive cooling electronics. Cedric explains why the fundamental mechanics of traditional pumps are already obsolete:
"Etching channels in silicon is only half the battle; you need a heart to move the coolant. Traditional mechanical pumps are fossils that cannot fit within the tight 1.2mm stack heights required for direct-to-chip or side-mounted cooling. Piezo-actuated microfluidics are the only logical path for compact Edge AI devices, providing the necessary pressure heads in a solid-state form factor to move heat to cooler zones within the device without the mechanical failure points of bearings or seals."
You can't rely on moving parts, seals, and bearings in ultra-compact consumer tech. You need solid-state reliability that actually fits the form factor.
2. AI compute spikes. Your cooling should too.
Whether on a server or a smartphone, AI workloads don't run at a constant speed. They come in heavy, sudden bursts. If your cooling pump only has a basic "on/off" setting, the system will lag behind the thermal spike.
To achieve true high heat flux cooling small form factor, the system must be dynamic. Cedric points out how the BOS1921 piezo driver fixes this lag:
"The BOS1921 acts as the high-resolution 'throttle' for these systems. Because AI workloads are inherently spiky, cooling cannot be binary. Our driver allows for on-the-fly modulation of both frequency and amplitude, giving engineers the ability to finely tune flow rates in real-time. This ensures that the coolant velocity is always matching to the instantaneous heat load of the SoC , preventing thermal lag during sudden compute bursts."
Real-time control allows you to match fluid velocity to the dynamic power load of the mobile chip at any given millisecond. That stops thermal throttling before it ruins the user experience.
3. Active cooling shouldn't kill the battery
In a datacenter, efficiency is about lowering the power bill. In consumer tech, it's about battery life. Every watt spent running the cooling system is a watt stolen from the device's runtime.
If you want effective compact active thermal management, the driver cannot generate its own heat. Cedric explains how our piezo architecture flips this power dynamic:
"Efficiency is the ultimate constraint in battery-powered devices. It is counterproductive to cool a mobile processor using a pump driver that adds its own significant thermal load to the system. By utilizing CapDrive™ technology to recover energy during the piezo's discharge cycle, we ensure the power budget is spent on compute, not on the cooling overhead. We are essentially making the pumping mechanism electrically 'invisible' to the overall system efficiency."
Energy recovery matters just as much in a smartphone as it does in a server rack. Your thermal management system has to be electrically invisible.
The Next Step in Active Micro-Cooling
If you are designing thermal solutions for the next generation of compact consumer devices, legacy mechanics are hitting a wall. Miniaturized active cooling systems are the only way to get serious heat transfer with a minimal power draw.
Explore how we are shrinking micro liquid cooling for electronics to fit the future of Edge AI at Boréas Technologies.
Leave a comment