ROHM provides a reference layout and thermal design guide in the BU4926F-TR application note (AN1915). It recommends a 4-layer PCB with a thermal pad connected to a GND plane to reduce thermal resistance and ensure efficient heat dissipation.
The BU4926F-TR has an internal POR and BOD. The POR threshold is typically 1.5V, and the BOD threshold is around 2.2V. When VCC falls below the POR threshold, the device resets. When VCC falls below the BOD threshold, the device enters a brown-out state. You can use external components to adjust the POR and BOD thresholds or use the internal defaults.
Yes, the BU4926F-TR is rated for operation up to 125°C (TJ). However, it's essential to consider the thermal management and derate the device accordingly to ensure reliable operation. ROHM provides a junction-to-ambient thermal resistance (RθJA) value of 42.5°C/W, which can help with thermal design considerations.
ROHM recommends following good PCB design practices, such as using a solid GND plane, minimizing trace lengths, and using EMI filters. Additionally, the BU4926F-TR has an internal EMI filter, and ROHM provides guidelines for external EMI filter design in the application note (AN1915).
ROHM recommends a pi-type filter (L-C-R) or a T-type filter (L-C-L) for input filtering. The component values depend on the specific application and requirements. ROHM provides general guidelines for input filter design in the application note (AN1915).
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