Texas Instruments' LM27762 delivers very-low-noise positive and negative outputs that are adjustable between ±1.5 V and ±5 V. The input-voltage range is from 2.7 V to 5.5 V and the output current goes up to ±250 mA. With an operating current of only 390 µA and a 0.5 µA typical shutdown current, the LM27762 provides ideal performance for power amplifier and DAC bias along with other high-current, low-noise, negative-voltage needs. The device provides a small solution size with few external components.

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 the 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 also be shorted together and connected to the input voltage. The LM27762 has an optional power good feature.