DC/DC Conversion, the key to low power consumption
Currently the development of rechargeable batteries is concentrated on lithium-type chemistries, which provide a maximum open output voltage of 4.2 V, while the voltage limit in silicon VLSI technology is about 2 Volt as a maximum usable supply voltage. Optimization towards low power consumption will require a multitude of supply voltages, depending on the application. High efficient DC/DC converters will bridge the gap, using either a coil or a capacitor for intermediate energy storage. Efficiency of capacitive converters is strongly dependent on the ratio between the switched capacitor and its parasitics, as well as the discharge ratio of the capacitor. Inductive converters are preferred as they allow an arbitrary ratio of input and output voltage. Both types can show about 90% efficiency.
KeywordsOutput Voltage Supply Voltage Pulse Width Modulation Battery Voltage Discontinuous Mode
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