A good PCB layout for the SBL1045 should prioritize thermal management, minimize parasitic inductance, and ensure a low-impedance return path for the high-frequency switching node. A 2-layer or 4-layer board with a solid ground plane and a separate power plane is recommended. Place the SBL1045 near the input capacitors and ensure a short, direct path for the input and output connections.
Choose input capacitors with low ESR (Equivalent Series Resistance) and high ripple current rating to minimize voltage ripple and ensure stable operation. Output capacitors should have low ESR and high capacitance to filter the output voltage. Consider using ceramic or polymer capacitors with X7R or X5R dielectrics for their high reliability and low ESR.
While the datasheet specifies an operating temperature range of -40°C to 125°C, the maximum ambient temperature for reliable operation depends on the specific application and cooling conditions. As a general guideline, keep the ambient temperature below 85°C to ensure a junction temperature below 125°C and prevent thermal shutdown.
To ensure EMC, follow good design practices such as using a shielded enclosure, keeping the SBL1045 and associated components away from the enclosure edges, and using a common-mode choke or ferrite bead on the input and output lines. Additionally, consider using a spread-spectrum clock or frequency hopping to minimize electromagnetic interference (EMI).
The SBL1045 is designed to operate efficiently over a wide input voltage range of 2.7V to 5.5V. However, for optimal efficiency, it's recommended to operate within the 3.3V to 4.2V range, where the device achieves its highest efficiency and lowest dropout voltage.
SBL1045 datasheet
by Diodes Incorporated
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