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5_V_MICROPOWER_LINEAR_REGULATOR

2015-03-23 20:22  
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5_V_MICROPOWER_LINEAR_REGULATOR
In battery systems where high load current is required intermittently and the system must remain in standby mode between uses, a linear regulator with micropower quiescent current and shut-down capability is needed. These situations arise in powering laptop disk drives, portable radio transmission modems, and peripheral motors, which are intermittently used. The LT1529 has 3 A current capability, 50 μA quiescent current, and just 16μA shutdown current. As shown in the circuit and chart, the LT1529-5 is a low-component-count solution with a very low dropout voltage of 0.6 V at 3-A output current. This low dropout is ideal for battery-powered systems in which extracting the maximum energy from the battery is important. In dropout, the output voltage will decrease smoothly, following the input. The quiescent current of the LT1529 increases only slightly in dropout, unlike the situation with many other low-dropout PNP regulators.