Dual 1A 1.5MHz Synchronous Step-Down Converters

The RT8056 is a high efficiency synchronous dual step-down converter. Capable of delivering two independent 1A output current over a wide input voltage range from 2.8V to 5.5V. The RT8056 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources such as cellular phones, PDAs and hand-held devices. The RT8056 provides two operation modes including PWM/Low- Dropout auto switch and shutdown modes. The internal synchronous rectifier with low R_DS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical applications. The RT8056 enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. The RT8056 enters shut-down mode and consumes less than 0.1μA when EN pin is pulled low. The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operating frequency of 1.5MHz.