Methods for Aachieving microamp quiescent current in switching regulators are discussed.
Many battery-powered applications require very wide ranges of power supply output current. Normal conditions require currents in the ampere range, while standby or “sleep” modes draw only microamperes. A typical laptop computer may draw 1 to 2amperes running while needing only a few hundred microamps for memory when turned off. In theory, any switching regulator designed for loop stability under no-load conditions will work. In practice, a regulator’s relatively large quiescent current may cause unacceptable battery drain ...