E910.27A

www.DataSheet4U.com - Preliminary - E910.27A External Adjustable High Efficiency PFM Step-Down Converter Features Brief Functional Description The easy to use hysteretic step-down converter provides high efficiency over a wide load and input range with few external components. An advanced PFM control scheme gives this device the benefits of a PWM converter with high efficiency at heavy loads, while using very low operating current at light loads to maintain an excellent behaviour over load variation. Maximum switching frequency of 300kHz permits small external components and operation to 100% duty cycle allows the lowest possible dropout voltage. For optimal flexibility an external shunt resistor sets the maximum output current. The converter contains a selectable internal reference with high or low voltage to regulate a wide range of output voltage or output current. The reference for output regulation can also be provided from an external source, like DAC. A selectable power good, reset or watchdog signal is provided. An external capacitor sets the reset output pulse duration and / or watchdog trigger time. An optional internal short delay timeout can greatly reduce the losses of the whole application in case of short or overload. Very low shutdown and quiescent currents and the wide input voltage range makes the converter ideal for battery powered systems. More than 90% efficiency and 100% duty cycle Wide input voltage range from 5V to 40V ...