A low dropout regulator with quick transient response is the LT ? 1764A. The device has a 340mV dropout voltage and can deliver 3A of output current. Operating quiescent current is 1mA, while shutdown quiescent current is 1A. Quiescent current is tightly controlled; unlike many other regulators, it does not increase during dropout. Fast transient response and extremely low output voltage noise make the LT1764A the perfect choice for delicate RF supply applications.