The MC34674 is a fully integrated single-cell Li-Ion and Li-Polymer battery charger optimized for travel charger applications.
The MC34674 is a fully integrated single‑cell Li‑Ion and Li‑Polymer charger optimized for travel‑charger applications. It requires only a few external components such as a dual‑color LED, an NTC thermistor, and decoupling capacitors. The device supports a high input voltage of up to 28 V, selectable charge current from 50 mA to 1.05 A, and a fixed 4.2 V constant‑voltage mode with ±0.4 % accuracy over –20 °C to 70 °C.
The datasheet provides pin definitions, internal block diagrams, static and dynamic electrical characteristics, and safety features such as input over‑voltage protection, thermal foldback, and battery‑connection verification. Variants MC34674A‑D allow different charge‑current settings, and the part is supplied in an 8‑lead 2 × 3 mm UDFN package.
| Input voltage range | -0.3 V to 28 V |
|---|---|
| Charge current range (CC mode) | 50 mA to 1.05 A |
| Constant‑voltage output | 4.2 V (±0.4 %) |
| Operating temperature range | -20 °C to 70 °C (voltage accuracy) |
| Package | 8‑lead 2 × 3 mm UDFN |
The device is rated for a maximum input voltage of 28 V, with an 11 V over‑voltage protection threshold.
The charge current is factory programmable and can be selected in steps of 50 mA from 50 mA up to 1.05 A.
The CV output voltage is accurate to ±0.4 % over a temperature range of –20 °C to 70 °C.
It is supplied in a small 8‑lead 2 × 3 mm UDFN package.