Single-cell Li-Ion linear charger with programmable current and timer
The BQ24202DGN is a constant-current linear charger for single-cell Li-Ion or Li-Polymer batteries, delivering up to 500 mA charge current from a supply rail as high as 13.5 V. Charge current and safety timer are programmable via external resistors, giving the BOM engineer control over charge profile without a digital interface. Fault protection includes over-temperature shutdown and short-circuit detection, both essential for battery-powered portable equipment where a runaway charge event risks cell damage.
Thermal and package considerations for layout
The device is housed in an 8-TSSOP/8-MSOP (0.118-inch, 3.00 mm width) package with an exposed pad — the 8-HVSSOP supplier device package. Surface-mount assembly with the exposed pad requires a solder stencil aperture covering at least 50% of the pad area for reliable void-free reflow.
The base product number BQ24202 covers multiple package and tape options; the DGN suffix identifies this specific 8-HVSSOP variant.