Linear charger for single-cell Li-Ion, now obsolete
The Texas Instruments BQ24205DGNR is a linear charger IC designed for single-cell Lithium Ion or Lithium Polymer battery packs. It delivers a constant charge current up to 500 mA and terminates at a 4.1 V battery pack voltage. The part integrates over-temperature and short-circuit fault protection, and offers programmable charge current and timer via external components.
The 500 mA maximum charge current sets the ceiling for how fast a single-cell Li-Ion pack can be charged.
8-HVSSOP with exposed pad — rework and thermal reality
The 8-HVSSOP package (3.00 mm width, exposed pad) is a small-outline package with a thermal pad underneath. For rework, the exposed pad means you need a hot-air station with a nozzle that covers the whole pad; a standard soldering iron won't get the pad hot enough to reflow. The pin 1 indicator is on the top side — a small dot — so orientation is clear under magnification.
Supply voltage and operating range
The IC accepts a maximum supply voltage of 13.5 V, which covers typical 5 V USB or 12 V wall-adapter inputs. The surface-mount package and tape-and-reel delivery are standard for automated assembly.
Obsolete — sourcing through independent distribution
That means the manufacturer no longer produces the part and has no planned last-time-buy window. New designs should not use this part. No official replacement or pin-compatible successor is listed by TI; any substitute would require a board redesign.