资 源 简 介
The LT®1121/LT1121-3.3/LT1121-5 are micropower lowdropout regulators with shutdown. These devices are capableof supplying 150mA of output current with a dropoutvoltage of 0.4V. Designed for use in battery-powered systems,the low quiescent current, 30μA operaTIng and 16μAin shutdown, makes them an ideal choice. The quiescentcurrent is well-controlled; it does not rise in dropout as itdoes with many other low dropout PNP regulators.Other features of the LT1121/LT1121-3.3/LT1121-5 includethe ability to operate with very small output capacitors. Theyare stable with only 0.33μF on the output while most olderdevices require between 1μF and 100μF for stability. Smallceramic capacitors can be used, enhancing manufacturability.Also the input may be connected to ground or areverse voltage without reverse current fl ow from outputto input. This makes the LT1121 series ideal for backuppower situaTIons where the output is held high and theinput is at ground or reversed. Under these condiTIons only16μA will fl ow from the output pin to ground.
