Adjustable Micropower Low-dropout Voltage Regulators

The LP2952 and LP2953 are micropower voltage Regulators with very low quiescent current (130 A typical at 1 mA load) and very low dropout voltage (typ. 60 mV at light load and 470 mV at 250 mA load current). They are ideally suited for battery-powered systems. Furthermore, the quiescent cur- rent increases only slightly at dropout, which prolongs bat- tery life. The LP2952 and LP2953 retain all the desirable character- istics of the LP2951 but offer increased output current, additional features, and an improved shutdown function. The internal crowbar pulls the output down quickly when the shutdown is activated. The error flag goes low if the output voltage drops out of regulation. By National Semiconductor Corporation