Pololu Pololu 9V, 2.3A Step-Down Voltage Regulator D24V22F9

Switching frequency: ~400 kHz; Integrated reverse-voltage protection, over-current protection, over-temperature shutoff, and soft-start; 1 mA typical no-load quiescent current; this can be reduced to approximately 5 µA to 10 µA per volt on VIN by disabling the board; Typical maximum continuous output current: >2 A