Boosting LED Power with the MAX44000 and MAX4729

To achieve the best combination with the MAX44000, an additional circuit stage is added. The analog switch sends the set voltage to the op amp current driver. The normally closed input is connected to ground and the normally open input is connected to the corresponding voltage. By connecting a pull-up resistor to the control pin, it is possible to switch the analog switch from the NC input to the NO input.

Figure 3. Using current regulation circuit to increase LED power.

This method is just one way to increase the transmitter output power, and other similar Maxim devices can be used. Other methods include using a pullup on DRV to send a voltage signal to the controller, which switches the DAC output between 0V and the voltage corresponding to the desired current.