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Advances in Radio Science An open-access journal of the U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V.

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Adv. Radio Sci., 9, 263-267, 2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
01 Aug 2011
Fully-integrated LDO voltage regulator for digital circuits
M. Lüders1, B. Eversmann2, D. Schmitt-Landsiedel1, and R. Brederlow2 1Munich University of Technology, Munich, Germany
2Texas Instruments Deutschland, Freising, Germany
Abstract. Low-dropout (LDO) voltage regulators are widely used to supply low-voltage digital circuits. For recent ultra-low-power microcontroller systems, a fully-integrated LDO without any external capacitance is preferred in order to achieve a fast and energy-efficient wake-up.

Commonly, an LDO is specified, designed and verified for DC load currents. In contrast, a digital load creates large current spikes. As an LDO designed for low quiescent current is too slow to react on fast current spikes, a minimum on-chip capacitance is required to keep the supply voltage within a certain error window. Different fully-integrated LDO topologies are investigated regarding their suitability to supply low-voltage digital circuits. The any-load stable LDO topology is selected and implemented on a 0.13 μm test-chip. The LDO is able to provide a maximum load current of 2.5 mA while consuming a quiescent current of 17 μA.

Citation: Lüders, M., Eversmann, B., Schmitt-Landsiedel, D., and Brederlow, R.: Fully-integrated LDO voltage regulator for digital circuits, Adv. Radio Sci., 9, 263-267,, 2011.
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