The LM2771 is a switched capacitor step-down regulator that produces a 1.5V output
without the use of an inductor. It is capable of supplying loads up to 250mA. The LM2771 operates
with an input voltage from 2.7V to 5.5V, and requires only 3 low-cost ceramic capacitors.
The LM2771 uses a regulated 0.5x charge pump to give power conversion efficiencies nearly
twice as high as an LDO. Pre-regulated 1.1MHz fixed-frequency switching results in very low ripple
and noise on both the input and the output. When output currents are low (<30mA typ.), the part
automatically switches to a low-ripple PFM regulation mode to maintain high efficiency over the
entire load range. At input voltages below 3.5V (Typ), the charge pump goes into pass mode, with
efficiencies similar to an LDO.
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