2 A adjustable buck with a wide input range
The BD9B200MUV-E2: The BD9B200MUV-: The ROHM BD9B200MUV- is a synchronous step-down (buck) regulator delivering up to 2 A from an input rail between 2.7 V and 5.5 V.
Switching frequency: 1 MHz or 2 MHz — a sizing lever
The BD9B200MUV- lets you select between 1 MHz and 2 MHz switching frequency. At 2 MHz the inductor can be roughly half the value needed at 1 MHz, which shrinks the footprint for space-constrained boards. At 1 MHz the switching losses drop, improving efficiency at lighter loads. The choice is a trade-off between inductor size and efficiency that the designer controls with a single pin or resistor — no external compensation network is required.
Package and thermal management for 2 A
The exposed pad also provides a low-impedance ground return for the switch node, which helps control EMI.
The - suffix indicates a lead-free / ROHS-compliant variant; the base part BD9B200MUV shares the same electrical specifications but may not carry the same compliance level — verify the suffix when cross-referencing.