LP5900TLX-1.9/NOPB

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The Texas Instruments LP5900 family of low-dropout (LDO) linear voltage regulators consists of devices offering low-noise, low-power operation with a wide variety of features. The devices offer several features for enhanced flexibility, such as input voltage range from 2.5 V to 5.5 V, output voltage range from 0.9 V to 5 V, and current limit protection from 1 A to 2.5 A. TheLP5900TLX-1.9/NOPB is a high-accuracy, low-noise, low-dropout linear regulator with an output voltage of 1.9 V.

Application Field

The LP5900TLX-1.9 regulators are designed to satisfy a wide range of low-voltage applications such as microprocessors (MPUs), digital signal processors (DSPs), analog/digitalsignal conditioners, RF transceivers and SRAMs. For applications requiring low quiescent current and high accuracy, the LP5900TLX-1.9 familyoffers fast transient response with a low-noise performance over the device\'s entire operating range. The LP5900TLX-1.9 family also offers high maximum output current.

Working Principle

The LP5900TLX-1.9 Series achieves these low-noise performance attributes by incorporating a low-power P-Channel MOSFET pass transistor in its output stage. The pass transistor is configured in a series regulator pass configuration that provides excellent transient response and low quiescent current operation. This series regulator circuit acts as a current source which allows the regulator to maintain a constant output current. This mode of operation eliminates the need to store energy during a load transient, thereby allowing the regulator to be fast and efficient.

The LP5900TLX-1.9 Series also includes several FET-debounce circuits which serve to reduce the power dissipation of the pass transistor. These FET-debounce circuits also reduce the output noise generated by the pass transistor during transient load steps. The LP5900TLX-1.9 Series also includes both current-limit protection and internal thermal shutdown protection.

The LP5900TLX-1.9 Series utilizes a voltage detector circuit in order to quickly detect when the output voltage is out of regulation. The voltage detector circuit also ensures that the output voltage is not significantly undershoot before the device can enter its current limit protection mode. The voltage reference used in the LP5900TLX-1.9 Series is extremely stable and is designed to provide good accuracy and temperature stability.

Conclusion

The LP5900TLX-1.9/NOPB is a high-accuracy, low-noise, low-dropout linear regulator with an output voltage of 1.9 V, designed to satisfy a wide range of low-voltage applications. The LP5900TLX-1.9 family offers fast transient response with a low-noise performance over the device\'s entire operating range, and features current-limit protection, internal thermal shutdown protection and FET-debounce circuits for reduced output noise. All of these features combine to make the LP5900TLX-1.9/NOPB an ideal choice for a variety of applications.

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