The mini2440’s power system utilizes a voltage step-down chip to generate three kinds of voltages: 3.3V, 1.8V and 1.25V which connected to an external 5V power supply. The following picture shows 1.25V Mini2440 Power Supply System Schematic Diagram.
This Mini2440 power supply system doesn’t have a full featured power management circuit, also it is not under software control.
(source: microarmsystems.com)
