TPS79919YZUR

The TPS79919YZUR is a low-dropout voltage regulator that provides accurate, adaptive low quiescent current, low-voltage solutions for space-restricted and current-sensitive systems that require accurate tracking.The single-chip solution is ideal for small and always-on, energy-saving applications, where low-dropout voltage regulation is needed to maintain accuracy and save power. It is designed to provide a low-loss, non-insulated, linear regulated output for a wide range of input voltages and currents.

The TPS79919YZUR voltage regulator integrates an error amplifier, a precision bandgap reference, an ultra-low quiescent current low-dropout (LDO) regulator and a high-side current source (HCSS). It can regulate output voltages as low as 0.8V up to 2.5V, and it features an input/output voltage difference (or dropout voltage) of only 80mV maximum. The operating quiescent current is only 2.5μA, allowing the device to operate in battery backup and energy saving modes.

The TPS79919YZUR has a high-side constant current source for series accuracy and Trimma capability when the output voltage needs to be controlled. The device also has a low-side feed-forward feature that compensates for quiescent current variations as a result of supply fluctuations, as well as a slew rate control pin to adjust the regulator’s switching frequency for noise sensitivity. Finally, the device also has an open-drain output for a controlled shutdown operation.

The TPS79919YZUR can be used in a variety of application fields. It is an ideal solution for low-loss, linear-regulated applications such as CMOS/BIOS RAM applications, as well as battery-powered and embedded applications. It also offers improved performance by reducing system-level power dissipation and noise, such as in DDR2/3 memory modules, or in mobile phones or PDAs. Additionally, the device can be used to power embedded processors in portable devices, or in energy harvesters, lighting control systems, and general sensor systems that require precision power.

The working principle of the TPS79919YZUR low-dropout voltage regulator is fairly simple. It uses a bandgap voltage reference, error amplifier, and a low-dropout pass-transistor regulator to deliver a regulated output from an unregulated input. The current from the input voltage is converted to a voltage by the device’s sense resistor and then compared to the adjustable voltage reference. The bandgap reference provides a known reference voltage for the comparator. The error amplifier then compares the input with the reference voltage and outputs a signal to the pass-transistor regulator to adjust the output voltage as needed.

In conclusion, the TPS79919YZUR low-dropout voltage regulator is an ideal solution for space-restricted and current-sensitive systems that require accurate voltage tracking. It offers a single-chip solution with low quiescent current, high accuracy, and low-dropout performance that is suitable for low-loss applications such as CMOS/BIOS RAM applications, battery-powered applications, and embedded processor applications. Additionally, the device has a slew rate control pin for noise sensitivity, as well as a high-side constant current source for series accuracy. Understanding its working principle helps designers implement the device for their specific applications.