STMicroelectronics provides a recommended PCB layout in the application note AN4553, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
The input capacitor selection depends on the input voltage, output voltage, and output current. A general guideline is to choose a capacitor with a capacitance value between 10uF to 22uF, and a voltage rating of at least 1.5 times the input voltage. Additionally, consider the capacitor's ESR, ripple current, and temperature rating.
While the datasheet specifies an operating temperature range of -40°C to 150°C, the maximum ambient temperature for reliable operation is typically considered to be around 125°C. Exceeding this temperature may lead to reduced performance, increased thermal stress, and potentially affect the device's lifespan.
Proper biasing involves ensuring the input voltage is within the recommended range (typically 4.5V to 18V), and the enable pin is properly driven. A pull-up resistor on the enable pin is recommended to prevent unwanted shutdown. Additionally, ensure the output voltage is within the specified range (typically 0.8V to 15V) and the output current is within the recommended limits.
To minimize EMI and noise, consider using a shielded inductor, placing the input capacitor close to the device, and using a ground plane to reduce radiation. Additionally, ensure proper PCB layout, use of decoupling capacitors, and consider adding EMI filters or common-mode chokes if necessary.
L5300AH7TR datasheet
by STMicroelectronics
