The TLC555QDRG4 can operate up to 2.1 MHz, but the maximum frequency is dependent on the values of the external resistors and capacitors used in the circuit.
To ensure stability and oscillation at the desired frequency, it's essential to follow the recommended component values and layout guidelines in the datasheet, and to minimize parasitic capacitance and inductance in the circuit.
The TLC555QDRG4 can source or sink up to 200 mA of output current, but the maximum current is dependent on the supply voltage and the impedance of the load.
While the TLC555QDRG4 can be used as a voltage regulator, it's not the most suitable application due to its limited output current and voltage regulation capabilities. A dedicated voltage regulator IC would be a better choice for most applications.
To reduce power consumption, consider using a lower supply voltage, reducing the frequency of operation, and optimizing the values of the external resistors and capacitors to minimize power losses.