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Automotive Linear Regulators Minimize Quiescent Current

Authored on: Apr 25, 2007

Technical Paper / Application Note

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Many automotive mechanical functions have been replaced or amended by electronic circuits in recent years. One consequence has been a rapid increase in the number of microcontrollers per car, producing a similar increase in the total current drawn from the car battery. Even when all passengers have left the car, many systems draw a keep-alive current to be ready for wake-up when their service is next required. Keeping these quiescent currents as low as possible requires linear regulators with low quiescent current as well as combinations of linear and switch-mode regulators. This article discusses the problem of minimizing quiescent current and introduces some solutions.

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