It delivers a programmable charge current up to 1A from a supply up to 16.5V, making it a straightforward fit for USB-powered or 5V wall-wart portable designs. The charge current is set with an external resistor, and a safety timer provides backup termination if the battery never reaches the 4.36V regulation voltage. Short-circuit protection on the output is built in — no external crowbar needed.
10-VSON (3x3) with exposed pad — layout and rework notes
The BQ24018DRCT comes in a 10-VSON package measuring 3x3 mm with an exposed thermal pad (supplier device package 10-VSON). That pad is the main heat path — the linear regulator drops the difference between input and battery voltage as heat, so at 1A charge current with a 5V input and a 3.7V battery, you are dissipating about 1.3W. For rework, the small VSON footprint is doable with a hot-air station and a fine tip; the exposed pad makes alignment obvious once you tin the pad. No lab bench required, just a steady hand.
Temperature range and environment — where this part lives
The wide range means the charge termination accuracy stays tight across temperature, which matters for Li-Polymer cells that are less tolerant of overvoltage at low temperature.
Active and ROHS3 — no LTB clock ticking
No last-time-buy notice on the horizon.