Cxsd6161 is a high efficiency, 1.5MHz fixed frequency, current mode PWM single-chip voltage regulator, the chip has adjustable output version. The working current of the regulator is 300uA when there is no load; when it is in off state, the working current drops below 1uA. The input operating voltage range is 2.5V to 6.5V, making the cxsd6161 very suitable for electronic products powered by a single lithium-ion battery or two to four dry cells. The duty cycle of cxsd6161 can reach 100% in the low-voltage differential operation mode, which extends the battery life of portable devices. When the output load becomes low, the cxsd6161 works in pulse hopping mode, which ensures low output ripple voltage and is conducive to the application environment sensitive to noise. The switching frequency of 1.5MHz makes the peripheral inductance and capacitance miniaturized. Aps2415 is equipped with built-in power switch and synchronous rectifier switch, without external Schottky diode. When the feedback terminal voltage is set to 0.6V, the output voltage can be reduced to 0.6V