Reworking the 6-PQFN: what to watch
The 2x2 mm PQFN with an exposed pad is a compact package, but its small size and fine pitch mean the thermal pad under the part must be well-soldered to the PCB copper pour for both heat sinking and electrical drain connection. Under a hot-air station, preheat the board to 100–120 °C to avoid warping the small package; use a fine tip and tack one corner first to confirm alignment — the exposed pad is the main heat path, and a cold joint there will cook the part under load.