This document introduces the BD6721FS product from ROHM, which is a single-phase full-wave fan motor driver. It includes a driver with power DMOS FET and features speed control through DC / direct PWM input, PWM soft switching, quick start, current limit, lock protection, and automatic restart. It is suitable for fan motors in general consumer equipment such as desktop PCs and projectors.
The BD6721FS is a single‑chip driver that integrates a power DMOS FET H‑bridge in an SSOP‑A16 package (6.60 mm × 6.20 mm × 1.71 mm). It includes a level amplifier for easy temperature control via a thermistor and offers PWM speed control, current limiting, lock protection, and status outputs (FG and AL).\n\nThe datasheet lists absolute maximum ratings, recommended operating conditions, pin assignments, electrical characteristics, and typical performance curves. It also contains mounting and handling precautions for reliable use in fan motor applications such as desktop PCs and projectors.
| Supply voltage (Veco) | 20 V |
|---|---|
| Power dissipation (Pd) | 812.51 mW |
| Operating temperature range | -40 to +100 °C |
| Output current (Ilo) | 1.07 A |
| Supply voltage operating range | 4.5 to 17.0 V |
| Package type | SSOP‑A16 (6.60 mm × 6.20 mm × 1.71 mm) |
The recommended supply voltage range is 4.5 V to 17.0 V.
The FG pin provides an open‑drain speed pulse signal output.
It is housed in an SSOP‑A16 package measuring 6.60 mm × 6.20 mm × 1.71 mm.
The device can operate up to +100 °C.