500 mA single-cell Li-Ion charger with USB interface
The Texas Instruments BQ24022DRCR is a linear battery charge manager from the bqTINY™-II series, designed for single-cell Lithium-Ion or Lithium-Polymer packs. It accepts power from a USB port or a regulated wall adapter and delivers a programmable constant-current / constant-voltage charge up to 500 mA, terminating at 4.2 V battery voltage. Key features include programmable charge current and safety timer, over-temperature fault protection, and a status output for charge indication.
Package and thermal footprint
The BQ24022DRCR is offered in a 10-VFDFN exposed-pad package, also designated as 10-VSON (3x3 mm). The small footprint (3x3 mm) and 0.50 mm pitch demand careful fan-out; a two-layer board with a solid ground plane under the pad is typical for this class of charger.