The TPS79518DCQR from Texas Instruments is a low-dropout (LDO) voltage regulator designed for high-performance portable applications. This device offers a wide input voltage range of 1.25V-5.5V, output current of 500mA, high power-supply ripple rejection (PSRR) of 80 dB, fast RF high-enable response, and low dropout 16mV at 500mA. It also features low quiescent current, low no-load current, and fast transient response. This device is ideal for ultra-low power RF applications in mobile platforms, such as cellular handsets, portable media players, and PDAs.