A single inductor multiple output converter with adaptive delta current mode control

The authors propose a single inductor multiple output converter (SIMO) with adaptive delta current mode control. A new time multiplexing scheme is also proposed for this type of control. With this control, the need of off-chip components for stability is eliminated. Use of single inductor for all outputs further eliminates additional magnetic components. This control makes the converter free from line and load regulation problems. It gives a good transient performance and reduces cross-regulation. To the best of authors' knowledge, no multiple output converter has been reported with adaptive delta current mode control. At the switching frequency of 500KHz, it achieves 80% efficiency for 1.5W of output power. The two outputs are regulated to 1.1V and 15V with an input supply of 3.3V. Excluding the inductor and capacitors, it is a fully integrated monolithic circuit, designed in a 3.3V, 0.4 mum, CMOS process