Fixed 7V rail at 300 mA — the exposed-pad thermal story
The BD70GA3WEFJ-E2: The BD70GA3WEFJ- from ROHM is a single-output linear regulator delivering a fixed 7V at up to 300 mA from a maximum 14V input rail. The 0.9V dropout at full load means the input must stay above 7.9V to maintain regulation — a 12V bus with 5% tolerance clears this with margin. The -25°C to 85°C operating range covers most industrial and telecom ambient conditions, but the junction temperature at 300 mA depends on the PCB copper area under the pad.
6 µA quiescent — what that means for always-on loads
Quiescent current sits at 6 µA typical, with supply current maxing at 900 µA. For a microcontroller or sensor that spends most of its life in sleep, the regulator's own draw is the floor on standby power — a battery-powered design sees meaningful runtime extension at this Iq level. The Enable and Soft Start control features let the system power up the 7V rail in a controlled ramp, reducing inrush into capacitive loads. Over-current and over-temperature protection are on-die — no external watchdog needed for basic fault handling.
Active production — sourcing and compliance posture
ROHM lists the BD70GA3WEFJ- as Active with RoHS3 compliance.