Texas Instruments TPS7A3301RGWT Adjustable Negative LDO Voltage Regulator, 1A

The Texas Instruments TPS7A3301RGWT is an ultralow-noise, low-dropout (LDO) linear voltage regulator engineered for high-precision applications. Capable of sourcing a maximum load of 1A with a minimal dropout voltage of just 325mV, it efficiently regulates negative voltage rails from inputs between -36V and -3V down to an adjustable output from -33V to -1.18V.

Designed using advanced bipolar technology, this regulator delivers exceptional performance where clean, stable voltage rails are critical. It features an exceptionally low noise floor of 16µVRMS (10Hz to 100kHz) and offers a high power-supply ripple rejection of 72dB at 10kHz. These specifications make it the ideal choice for powering sensitive analogue components such as operational amplifiers, analogue-to-digital converters (ADCs), digital-to-analogue converters (DACs), and other high-performance circuitry.

Key Features & Protection

The device includes a CMOS logic-level-compatible enable (EN) pin, facilitating sophisticated, user-customisable power management schemes within a system. For robust operation, built-in current-limit and thermal shutdown protection safeguards both the regulator and the wider system during fault conditions. It is designed for stability with modest, space-saving ceramic output capacitors of 10µF or greater.

Applications

This linear regulator is perfectly suited for post-regulation of DC-DC converters, where it filters out the inherent switching noise to ensure maximum system performance. Its ultralow-noise characteristics are critical in demanding fields including professional audio equipment, sensitive instrumentation, medical devices, RF communication systems, and industrial sensing.

As a green product, it is manufactured without antimony or brominated flame retardants (no Sb/Br), aligning with modern environmental standards for electronic components.