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Synchronous BOOST, LM5122, Hakko T12 portable power module, 9~20V input, 24V output.

Overview

It uses the LM5122, featuring peak current control and fast response. The application scenario is using a 3S~6S lithium battery to power the T12 soldering iron in emergencies or while in motion, maximizing the capabilities of the Hakko T12 soldering iron.
Below is a picture of the actual product:

I didn't notice when drawing it that I used the more expensive LM5122MH model. Those who can afford it can replace it with the cheaper LM5122z model; the only difference is the pinout. I already have one and am too lazy to change it.
With the T12 soldering iron:

Operating diagram:

Measured at 9V input, the output can reach 120W at 24V.

Design Files

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Update:2026-03-26 22:59:24

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