Battery protection IC for 3-4 series Li-ion packs
The Texas Instruments BQ7790400PW is a battery protection IC designed for 3 to 4 series-connected lithium-ion cells, integrating overcurrent, overtemperature, and over/under-voltage fault protection into a single 20-TSSOP package.
Package variant and ordering code
This ordering code ships in a Tube — the PW suffix on the BQ7790400PW signals the 20-TSSOP package in tube format, not tape-and-reel.
ROHS3 compliant, so no RoHS exemption expiry to manage for EU-market equipment. The protection set covers the three failure modes that dominate Li-ion pack field returns: overcurrent (short-circuit or excessive load), overtemperature (thermal runaway prevention), and over/under-voltage (cell imbalance or charger fault).