LTC1879? High Efficiency: Up to 95%Low Quiescent Current: Only 15µA with No Load550kHz Constant Frequency Operation2.65V to 10V Input Voltage RangeVOUTfrom 0.8V to VIN, IOUTto 1.2ATrue PLL Frequency Locking from 350kHz to 750kHzPower Good Output Voltage MonitorLow Dropout Operation: 100% Duty Cycle
开关芯片,效率不错,不过1.2A电流好像仍然有点不够.
这个不错: LM1085: 3A Low Dropout Positive Regulators !
The LM1085 is a series of low dropout positive voltage
regulators with a maximum dropout of 1.5V at 3A of load
current. It has the same pin-out as National Semiconductor’s
industry standard LM317.