Essential for Low-Noise Power Design: 5 Key Factors for Selecting the Right LDO

Richtek offers a wide range of low-noise industrial-graded LDOs with the following key features:

1. High Precision, Low Output Voltage：Richtek’s industrial-graded LDOs support an input voltage range from 1.1V to 6.5V, requiring only a single power input without additional power sources, simplifying system design. Some products provide an ultra-low output voltage down to 0.5V with high accuracy of ±1%.
2. Superior Noise Immunity：With high Power Supply Rejection Ratio (PSRR) of approximately 40dB at 500kHz and excellent noise immunity of 6.8 µVRMS, our industrial-graded LDOs effectively reduce noise interference.
3. Ultra-Low Dropout：Ultra-low dropout voltage reduces power consumption. For example, the RTQ2540H achieves a maximum dropout of just 145mV at 4A load, minimizing heat dissipation while improving efficiency, ideal for high-power applications.
4. Compact Packaging for Space-Constraint Designs：Richtek provides some LDOs housed in ultra-small WQFN 2.2mm × 2.5mm packages, optimized for high-density PCB layouts.
5. Flexible Design Options：Some LDOs feature an NR/SS pin for enhanced noise reduction via an external bypass capacitor. Additionally, our easy-out LDO series allows output voltage setting via pin strapping without resistors, ideal for I/O power and GPIO applications.

When selecting a low-noise LDO, key factors such as input/output range, PSRR, dropout voltage, packaging, and functionality must be considered. Richtek’s industrial-graded LDOs ensure reliable and stable power for diverse applications.