Regulators_with_ultra_low_dropout

Published:2009/7/24 8:22:00 Author:Jessie | From:SeekIC

Battery life is significantly affected by the dropout performance of linear regulators. These circuits offer lower dropout voltage than any monolithic regulator (below 50 mV at 1 A, increasing to only 450 mA at 5 A). Line and load regulation are within 5 mV, and initial output accuracy is inside 1%. The circuits are fully short-circuit protected, and have no-load quiescent current of 600μA. Figure 4-37B shows a simple way to add shutdown to the regulator of Fig. 4-37A.A CMOS inverter or gate biases Q2 to control LT1123 bias. When Q2 is driven, the loop functions normally. With Q2 unbiased, the circuit goes into shutdown and pulls no current.



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