Single-cell Li-ion fuel gauge with HDQ
The BQ27000DRKRG4 from Texas Instruments is a single-cell battery monitor in the bqJUNIOR™ series, designed to track charge and discharge in Lithium Ion/Polymer packs. It communicates over a single-wire HDQ interface, keeping the pin count low on a 10-VSON (3x4 mm) package.
10-VSON exposed-pad — layout and thermal path
The 10-VFDFN exposed pad (10-VSON) package requires a thermal land pattern on the PCB that matches the pad dimensions for heat sinking. The exposed paddle is the primary thermal path for the monitor during high-rate charge/discharge cycles. The 3x4 mm footprint fits tight battery-pack layouts.
Temperature grade — consumer portable gear
It is not specified for automotive under-hood or industrial extended-temperature environments.
