Do MAX77839 B & D variants work in FPWM mode or auto-skip mode by default?

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Accepted Answer

MAX77839 A & C variants can be forced to operate in PWM mode or auto-skip mode using a GPIO. This GPIO acts as digital input enable pin to force the IC in either mode, i.e. it will be forced to operate in the mode configured by this GPIO regardless of the load conditions. 
 Whereas, MAX77839 B & D variants cannot be forced to operate in either mode. Instead, they will follow the waveform below on startup and work in auto-skip mode generally.

- The "auto-skip" feature allows the converter to switch between different modes automatically by monitoring load conditions etc - It reduces effective switching frequency and eliminates switching losses by not generating a switching pulse when the load is light, preventing the output voltage from rising too high. This results in reduced power consumption and better efficiency under low-load conditions. 
 
 The same GPIO on the B & D variant is a POK open drain output that needs to be pulled up with 15kΩ resistor to IO voltage. it is an output pin which pulls LOW if the output reaches within ±10% of the target voltage. This feature in these variants is used in applications for controlling the power-up sequence.

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MAX77839: FAQ