The TPS7A39 device is a dual, monolithic, high-PSRR, positive and negative low-dropout
(LDO) voltage regulator capable of sourcing (and sinking) up to 150 mA of current. The regulated
outputs can be independently and externally adjusted to symmetrical or asymmetrical voltages,
making this device an ideal dual, bipolar power supply for signal conditioning.
Both positive and negative outputs of the TPS7A39 ratiometrically track each other during
startup to mitigate floating conditions and other power-supply sequencing issues common in
dual-rail systems. The negative output can regulate up to 0 V, extending the common-mode range for
single-supply amplifiers. The TPS7A39 also features high PSRR to eliminate power-supply noise, such
as switching noise, that can compromise signal integrity.
Both regulators are controlled with a single positive logic enable pin for interfacing
with standard digital logic. A capacitor-programmable soft-start function controls in-rush current
and start-up time. The internal reference voltage of the TPS7A39 can be overridden with an external
reference to enable precision outputs, output voltage margining, or to track other power supplies.
Additionally, the TPS7A39 has a buffered reference output that can be used as a voltage reference
for other components in the system.
These features make the TPS7A39 a robust, simplified solution to power operational
amplifiers, digital-to-analog converters (DACs), and other precision analog circuitry.
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