ROHM's highly efficient step-up/down switching regulator BD8301MUV produces step-up/down output including 3.3 V from 1 cell of lithium battery with just one coil. This IC adopts an original step-up/down drive system and creates a higher efficient power supply than conventional Sepic-system or H-bridge system switching regulators. It is suitable for general portable equipment like portable audio or DSC/DVC.
The BD8301MUV integrates a step‑up/down DC/DC converter and a built‑in power MOSFET, allowing a single‑inductor solution for portable equipment such as audio devices or DSC/DVC. It operates from a 1‑cell lithium battery and delivers a regulated 3.3 V output at 1 A.
The technical note provides electrical characteristics, pin descriptions, block diagrams, example circuits, layout guidelines, and ordering information. It also outlines absolute maximum ratings, operating conditions, and protection features such as soft‑start and timer‑latch short‑circuit protection.
| Input voltage range | 2.5 V to 5.5 V |
|---|---|
| Output voltage range | 2.8 V to 5.2 V |
| Maximum output current | 1 A at 3.3 V |
| Soft‑start function | Enabled |
| Timer latch short‑circuit protection | Enabled |
| Package | VQFNO020V4040 (QFN 4 × 4 mm) |
| Maximum input voltage | 7.0 V |
| Power dissipation | 700 mW |
| Operating temperature range | -25 °C to +85 °C |
It operates from 2.5 V to 5.5 V supply voltage.
The device can deliver up to 1 A at a 3.3 V output.
Yes, a soft‑start function is incorporated to limit in‑rush current.
It is supplied in a VQFNO020V4040 QFN package (4 × 4 mm).