The UC3625Q requires careful layout and placement to ensure proper operation. TI recommends placing the IC close to the input capacitors, using a solid ground plane, and keeping the high-current paths short and wide. A 4-layer PCB with a dedicated power plane is recommended.
To minimize standby power consumption, ensure that the input voltage is removed during shutdown, and the EN pin is pulled low. Additionally, use a low-leakage capacitor for the VCC pin, and consider using a low-quiescent-current voltage regulator for the VCC supply.
The maximum allowed voltage on the VCC pin is 15V, but TI recommends keeping it below 12V for reliable operation. Exceeding this voltage may damage the IC.
The UC3625Q has a built-in overcurrent protection feature that limits the output current to prevent damage. If an overcurrent condition is detected, the IC will shut down and restart after a brief delay. To handle overcurrent protection, ensure that the output current is within the specified limits, and consider adding external overcurrent protection circuitry if necessary.
TI recommends using a low-ESR capacitor with a value between 10uF to 22uF, and a voltage rating of at least 25V. A ceramic or film capacitor is recommended, as they have lower ESR and ESL compared to electrolytic capacitors.
UC3625Q datasheet
by Texas Instruments
