LTC3440EDD#TRPBF

LTC®3440 is a high efficiency, fixed frequency, buck boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single lithium-ion, multicell alkaline or NiMH applications where the output voltage is within the battery voltage range. The device includes two 0.19ohm N-channel MOSFET switches and two 0.22ohm P-channel switches. Switching frequencies up to 2MHz are programmed with an external resistor and the oscillator can be synchronized to an external clock. Quiescent current is only 25µA in burst mode operation, maximizing battery life in portable applications. Other features include a 1µA shutdown, soft-start control, thermal shutdown and current limit. Typical applications are palmtop computers, handheld instruments, MP3 players, digital cameras.