Cxsd6149 is a high efficiency, 1.5MHz fixed frequency, current mode PWM single-chip voltage regulator, which can provide adjustable output voltage and 1.2V, 1.8V fixed output voltage. The working current of the voltage regulator is 300uA when there is no load; when it is turned off, the working current drops below 1uA. The input working voltage range is 2.5V to 6.5V, which is very suitable for electronic products powered by single lithium-ion battery or two to four dry batteries. The duty cycle of cxsd6149 can be up to 100% in low-voltage differential operation mode, which extends the battery life of portable devices. When the output load becomes low, the cxsd6149 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. The cxsd6149 has 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. Small sot23-5l package saves the area of PCB.