What is the output current of ADP3335 MSOP ?

Hi Kiyoung SON,

It is unlikely that the part goes into thermal shutdown as the load current goes above 100mA. To help you with the calculation, the theta-ja for a 2-layer MSOP board is around 220degC/W. At 110mA load, the power dissipated in the die is (5.0V-3.3V) x 110mA, which gives about 0.187W. Therefore, the junction temperature rises to ( 35degC + 220 x 0.187 ), which is about  76.14degrees. At 200mA load, the junction temp rises to only about 109.8degrees which is still far from the thermal shutdown threshold.

I suggest that you double check the solder condition of your components, and make sure that the input and output caps are placed close to the ADP3335, try also to swap out parts to check if you're seeing the issue with multiple ICs.

Best regards,

Jess

Hi Kiyoung SON,

It is unlikely that the part goes into thermal shutdown as the load current goes above 100mA. To help you with the calculation, the theta-ja for a 2-layer MSOP board is around 220degC/W. At 110mA load, the power dissipated in the die is (5.0V-3.3V) x 110mA, which gives about 0.187W. Therefore, the junction temperature rises to ( 35degC + 220 x 0.187 ), which is about  76.14degrees. At 200mA load, the junction temp rises to only about 109.8degrees which is still far from the thermal shutdown threshold.

I suggest that you double check the solder condition of your components, and make sure that the input and output caps are placed close to the ADP3335, try also to swap out parts to check if you're seeing the issue with multiple ICs.

Best regards,

Jess