2.8V fixed LDO for automotive sensor rails
The ROHM BU28SD2MG-MTR is a single-output, positive fixed linear regulator delivering 2.8V at up to 200 mA.
Maximum dropout is 0.15 V at 100 mA output. That headroom lets the regulator hold 2.8V regulation when the input dips toward 2.95V — relevant during engine cranking when the battery bus sags below 6V. PSRR is 68 dB at 1 kHz. That attenuation cleans up alternator ripple and switching-regulator noise on the input bus, which matters for analog sensor supplies and CAN transceiver bias rails where conducted noise couples into the signal path.
Protection and quiescent draw
Built-in over-current and over-temperature protection let the part survive a shorted output or a stalled load without external clamp diodes. Quiescent current is 80 µA typical, low enough for always-on modules in a vehicle that must not drain the battery during key-off. The enable pin (Control Features) allows the system MCU to gate the regulator output for sequenced power-up or sleep-mode power-down, cutting Iq to near zero when the rail is not needed.
Package and board-fit
Housed in a 5-pin SOT-753 (SC-74A) package, surface-mount. The enable and output pins sit on a standard 0.95 mm pitch — no fine-pitch rework required.