Dostal's Designs: Why You Need Level Shifting in Buck-Boost Circuits (Download)

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The magnitude of the negative voltage generated by inverting buck-boost circuits can be higher or lower than that of the available positive voltage. For example, –8 V or even –14 V can be generated from +12 V. When working with a switching-regulator IC that has an inverting buck-boost circuit, communications pins may be needed in the system design. If they are required, it’s essential for designers to remember adequate level shifting so that synchronization and enable signals can be utilized.