The datasheet for pico's chip lists the current characteristics in Table 12.
Output current sunk/sourced by any I/O and control pin 25mA. Total
output current sunk/sourced by sum of all I/O and control pins
12omA
This current consumption must be correctly distributed over all I/Os
and control pins. The total output current must not be sunk/sourced
between two consecutive power supply pins referring to high pin count
LQFP packages.
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The datasheet for pico's chip lists the current characteristics in Table 12.