SP6641BEK-L-3-3

The SP6641BEK-L-3-3 is an ultra-low quiescent current high efficiency DC-to-DC Boost Converter designed for single and dual cell alkaline or Li-ion battery applications. The SP6641 features a 10µA quiescent current, a 0.3R N-channel charging switch, 0.9V input startup and a 0.33A or 1.0A inductor current limiting feature. It is preset to 3.3V and can be controlled by a 1nA active low shutdown pin. It combines a fixed inductor peak current limit, a feed-forward minimum OFF-time one-shot and a precision loop comparator to regulate the output voltage. Under light-load conditions the loop operates as a standard PFM converter. The frequency of fixed amplitude inductor current triangles is modulated to regulate the load. Under heavy load conditions, the converter adjusts the number of successive continuous mode current pulses to regulate the load. Refer to the block diagram for the following explanation of operating modes in loop regulation.