The SP6681 is a charge pump ideal for converting a +3.6V Li-Ion battery input to a +5.0V regulated output. An input voltage range of +2.7V to +5.5V is converted to a regulated output of 5.0V. The SP6681 device will operate at three different switching frequencies corresponding to three different output resistances and load current ranges. An external 32.768kHz nominal clock signal is used to produce three synchronized pump frequencies through the use an internal phase lock loop to drive the charge pump. Two control inputs can adjust the internal pump frequency on the fly to 8.192kHz (fINPUT / 4), 32.768kHz (fINPUT x 1), or 262.14kHz (fINPUT x 8). The charge pump configuration dynamically changes to optimize power efficiency. At low input voltages the charge pump doubles the input while at higher inputs the output is 1.5 times the input. The SP6681 can deliver high power efficiencies up to 96% with low quiescent currents from 175A to 800A. The SP6681 is offered in a 10-Pin SOIC package. 2.2F