A thermal pad is recommended under the IC to improve heat dissipation. A 2-layer or 4-layer PCB with a solid ground plane and thermal vias can help reduce thermal resistance. Refer to onsemi's application note AND8393/D for more details.
To ensure stable output voltage regulation, it's essential to follow the recommended input and output capacitor values and types, as well as the suggested PCB layout. Additionally, ensure that the input voltage is within the recommended range, and the output current is within the specified limits.
The maximum allowed input voltage ripple is not explicitly stated in the datasheet. However, as a general guideline, it's recommended to keep the input voltage ripple below 1% of the nominal input voltage to ensure stable operation.
The LB11851FA-BH is rated for operation up to 125°C. However, the maximum junction temperature (Tj) should not exceed 150°C. Ensure that the device is properly heatsinked, and the thermal design is adequate for the specific application.
The power dissipation of the regulator can be calculated using the formula: Pd = (Vin - Vout) x Iout + (Vin x Iq), where Vin is the input voltage, Vout is the output voltage, Iout is the output current, and Iq is the quiescent current. Refer to the datasheet for the specific values.
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