INDUCTORLESS_SWITCHING_REGULATOR

Published:2009/6/25 2:37:00 Author:May | From:SeekIC

In conventional applications, switching-regulator ICs regulate 6,, by controlling the current through an external inductor. The IC in A, however, driving a diode-capacitor network in place of the inductor, offers comparable performance for small loads. The network can double, triple, or quadru-ple the input voltage. Feedback from the R1/R2 voltage divider enables IC1 to set the regulated-output level. (As shown, the circuit derives 12 V from a 5- to 12-V input and provides as much as 2 mA of output cur-rent.) Adding a noninverting MOS driver (B) boosts the available output current to 20 mA. Substi-tuting the diode-capacitor network shown for an inductor allows this switching-regulator IC to deliver 2 mA at comparable line and load regulation, with somewhat reduced efficiency.



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