The MT3820 is a dual high-efficiency Pulse-Width-Modulated (PWM) step-down DC/DC converter. It is capable of delivering 1.2A output current over a wide input voltage range from 2.4V to 5.5V, the MT3820 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources within the range such as cellular phones, PDAs and other handheld devices. Two operational modes are available. PWM/Low-Dropout auto-switch and shutdown modes. Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application. The MT3820 enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper PMOS. The MT3820 enter shutdown Mode And consumes less than 0.1μA when EN pin is pulled low. 

             应用

z Cellular and Smart Phones 

z Personal Information Appliances

z Wireless and DSL Modems 

z MP3 Players 

z Digital Still and Video Cameras​