Ultra_low_dropout_regulator

Published:2009/7/24 4:06:00 Author:Jessie | From:SeekIC

This simple regulator has only 85-mV dropout at 2.5 A. The low dropout makes the circuit particularly suitable for battery-driven laptop computers. The 12V required for the Q1 gate is found (on laptop computers) as the power source for disk drives and other peripherals. The shunt across the A1 inputs provides short-circuit protection. Figure 8-52C shows construction details for the shunt (both PC and wire versions). Figure 8-52D shows resistance versus size for various copper wire sizes. Figure 8-52B shows dropout characteristics for the circuit.



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