Single-cell Li-Ion charger with 28V input tolerance
The NXP MC34676BEPR2 is a single-cell constant-current, constant-voltage Li-Ion battery charger IC in a 12-lead DFN2514-12 package with an exposed thermal pad. It accepts a supply voltage up to 28V, making it suitable for systems that need to survive unregulated adapters or 24V industrial rails without an external pre-regulator. The charge current is programmable up to 1.2A, and the IC includes over-voltage fault protection on the input.
Package and mounting
The 28V maximum supply voltage is the headline number for this part. It means you can connect a 24V industrial power supply or a 12V automotive rail directly to the input without a series regulator or a high-voltage buck front end — the charger handles it. The 1.2A maximum charge current is programmable, so you can set a lower current for smaller cells or for thermal management in the DFN package. At 1.2A the exposed pad needs a good thermal via stitch to the ground plane; without it the junction temperature climbs fast in a 85°C ambient.
Package and footprint for the rework bench
The MC34676BEPR2 comes in a 12-UFDFN with exposed pad, supplier device package DFN2514-12. That is a 2.5 mm × 1.4 mm body with a thermal pad underneath. The pad must be soldered to the PCB ground plane — a hot-air station or reflow oven is needed; hand-soldering with an iron is tricky because the pad is hidden. Orientation is marked by pin 1 chamfer on the top, but the package is tiny, so a magnifier or microscope is recommended for placement.
Production status and sourcing
It is ROHS3 compliant.