型号：LTC3548AEMSE

现货，原厂进口全新原装，假一赔十！

LTC3548AEMSE

LTC3548AEMSE

LTC3548AEMSE

he LTC®3548A is a dual, constant frequency, synchronous step-down DC/DC converter. Intended for low power ap-plications, it operates from a 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, enabling the use of tiny, low cost capacitors and inductors 1mm or less in height. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 0.7A/1.2A power switches provide high effi ciency without the need for external Schottky diodes.A user-selectable mode input is provided to allow the user to trade-off ripple noise for low power effi ciency. Burst Mode® operation provides the highest effi ciency at light loads, while pulse-skipping mode provides the lowest ripple noise at light loads

To further maximize battery life, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent current of only 40μA. In shutdown, the device draws <1μA

The LTC3548A uses a constant frequency, current mode architecture. The operating frequency is set at 2.25MHz and can be synchronized to an external oscillator. Both channels share the same clock and run in phase. To suit a variety of applications, the selectable MODE/SYNC pin allows the user to trade-off noise for effi ciency. The output voltage is set by an external divider returned to the VFB pins. An error amplifi er compares the divided output voltage with a reference voltage of 0.6V and adjusts the peak inductor current accordingly. Overvoltage and undervoltage comparators will pull the POR output low if the output voltage is not within ±8.5%. The POR output will go high after 65,536 clock cycles (about 29ms in pulse-skipping mode) of achieving regulation.