The LM27762 delivers very low-noise positive and negative outputs that are adjustable
between ±1.5 V and ±5 V. Input-voltage range is from 2.7 V to 5.5 V, and output current goes up to
±250 mA. With an operating current of only 390 µA and 0.5-µA typical shutdown current, the
LM27762 provides ideal performance for power amplifier and DAC bias and other high-current,
low-noise negative voltage needs. The device provides a small solution size with few external
Negative voltage is generated by a regulated inverting charge pump followed by a
low-noise negative LDO. The inverting charge pump of the LM27762 device operates at 2-MHz (typical)
switching frequency to reduce output resistance and voltage ripple. Positive voltage is generated
from the input by a low-noise positive LDO.
Positive and negative outputs of LM27762 have dedicated enable inputs. These outputs
support independent timing for the positive and negative rails for specific system power-sequence
needs. Enable inputs can be also shorted together and connected to the input voltage. The LM27762
has an optional Power Good feature.
For all available packages, see the orderable addendum at the
end of the data sheet.
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