BD2041AFJ/BD2051AFJ is a single channel high side switch IC for USB port. It is a high side switch with over current protection used in power supply line of universal serial bus (USB). N-channel power MOSFET of low on resistance and low supply current are realized in this IC. And, over current detection circuit, thermal shutdown circuit, under voltage lockout and soft start circuit are built in.
The BD2041AFJ and BD2051AFJ are single‑channel high‑side switch ICs designed for USB power‑supply lines. They integrate a low‑on‑resistance N‑channel MOSFET, over‑current detection, thermal shutdown, UVLO, and soft‑start circuitry.
Key specifications include a 2.7 V–5.5 V input range, 0.5 A continuous current, 80 mΩ typical ON resistance, and operation from –40 °C to +85 °C. The devices are offered in SOP‑J8 packages and feature active‑low (BD2041AFJ) or active‑high (BD2051AFJ) control logic. Application examples such as USB hubs and car accessories are provided along with typical performance curves and mounting precautions.
| Input voltage range | 2.7 V to 5.5 V |
|---|---|
| Continuous current load | 0.5 A (Typ.) |
| Over‑current threshold | 0.7 A min., 1.6 A max. |
| Operating temperature range | -40 °C to +85 °C |
| Control input logic | Active‑Low for BD2041AFJ, Active‑High for BD2051AFJ |
| Enable input voltage levels | High > 2.0 V, Low < 0.8 V |
| Storage temperature range | -55 °C to 150 °C |
The devices operate with an input voltage from 2.7 V to 5.5 V.
BD2041AFJ uses active‑low control, while BD2051AFJ uses active‑high control.
The devices are rated for operation from –40 °C to +85 °C.