MT3820

Dual High-Efficiency PWM Step-Down DC/DC Converter MT3820 GENERAL DESCRIPTION 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. FEATURES z High Efficiency: Up to 96% z 1.5MHz Constant Frequency Operation z 1.2A Output Current z No Schottky Diode Required z 2.4V to 5.5V Input Voltage Range z Output Voltage as Low as 0.6V z Low Quiescent Current: 30µA z Slope Compensated Current Mode Control for Excellent Line and Load Transient Response z Thermal Fault Protection z Inrush Current Limit and Soft Start z <1µA Shutdown Current z Small 12-Lead WDFN package APPLICATIONS z Cellular and Smart Phones z Personal Information Appliances z Wireless and DSL Modems z MP3 Players z Digi...