YB1680

YB1680 1.5MHz, 600mA Synchronous Step-Down Converter Description The YB1680 is a 1.5MHz constant frequency, slope compensated current mode PWM step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. It is ideal for powering portable equipment that runs from a single cell lithium-Ion (Li+) battery. The YB1680 can supply 600mA of load current from a 2.5V to 5.5V input voltage. The output voltage can be regulated as low as 0.6V. The YB1680 can also run at 100% duty cycle for low dropout operation, extending battery life in portable system. Idle mode operation at light loads provides very low output ripple voltage for noise sensitive applications. The YB1680 is offered in a low profile 5-pin, SOT package, and is available in an adjustable version. Features „ „ „ „ „ „ „ „ „ „ „ „ „ „ High Efficiency : Up to 94% 1.5MHz Constant Switching Frequency 600mA Output Current at VIN=3V Integrated Main Switch and Synchronous Rectifier. No Schottky Diode Required 2.5V to 5.5V Input Voltage Range Output Voltage as Low as 0.6V 100% Duty Cycle in Dropout Low Quiescent Current : 300μA Slope Compensated Current Mode Control for Excellent Line and Load Transient Response Short Circuit Protection Thermal Fault Protection <1μA Shutdown Current Space Saving 5-Pin SOT23 Package Pb-free Package Applications „ „ „ „ „ „ „ Cellular and Smart Phones Microprocessors and DSP Core Supplies Wireless and DSL Modems PDAs ...