Stackable controllers for multiphase switching converters and power supply system thereof

A controller for a multiphase switching converter, wherein the multiphase switching converter has a plurality of switching circuits coupled in parallel to provide an output voltage, the controller comprising:

• a turn-on control pin, wherein when the controller is configured as a master controller, the turn-on control pin is configured to provide a turn-on control signal based on the output voltage, and when the controller is configured as a slave controller, the turn-on control pin is configured to receive the turn-on control signal from another controller;
• and
• a plurality of switching control pins, wherein the controller is configured to provide a plurality of switching control signals at the plurality of switching control pins to successively turn ON the plurality of switching circuits.

A control method for a multiphase switching converter, wherein the multiphase switching converter has a controller and a plurality of switching circuits coupled in parallel to provide an output voltage, the control method comprising:

• providing or receiving a turn-on control signal at a turn-on control pin, wherein when the controller is configured as a master controller, providing the turn-on control signal at the turn-on control pin, and when the controller is configured as a slave controller, receiving the turn-on control signal provided by the master controller at the turn-on control pin;
• and
• providing a plurality of switching control signals at a plurality of switching control pins to turn ON the plurality of switching circuits successively.