Abstract
In this paper, we propose a fully integrated switched-capacitor DC–DC converter with low ripple and fast transient response for portable low-power electronic devices. The proposed converter reduces the output ripple by filtering the control ripple via combining a low-dropout regulator with a main switched-capacitor DC–DC converter with a four-bit digital capacitance modulation control. In addition, the four-phase interleaved technique applied to the main converter reduces the switching ripple. The proposed converter provides an output voltage ranging from 1.2 to 1.5 V from a 3.3 V supply. Its peak efficiency reaches 73% with ripple voltages below 55 mV over the entire output power range. The transient response time for a load current variation from 100 μA to 50 mA is measured to be 800 ns. Importantly, the converter chip, which is fabricated using 0.13 μm complementary metal–oxide–semiconductor (CMOS) technology, has a size of 2.04 mm2. We believe that our approach can contribute to advancements in power sources for applications such as wearable electronics and the Internet of Things.
Highlights
Rapid advances in the Internet of Things and wearable electronic devices have led to an increasing demand for various types of sensors [1]
Certain off-chip passive components such as inductors and capacitors are required for external support of the power management integrated circuits (ICs) because they cannot be integrated into the chip
Here, we propose a low-ripple fast-transient SC DC–DC converter operating over the output current range, which integrates all the active and passive components on a single chip
Summary
Rapid advances in the Internet of Things and wearable electronic devices have led to an increasing demand for various types of sensors [1]. Certain off-chip passive components such as inductors and capacitors are required for external support of the power management IC because they cannot be integrated into the chip In this regard, multichip configurations are convenient for a sensor module design, the cost and size of the resulting modules increase. The power management unit normally comprises a high-efficiency switching DC–DC converter and a linear low-dropout regulator. Integrated SC DC–DC converters require additional techniques to suppress the ripple due to the size limitations of the load and flying capacitors. This method modulation controls the time for which the flying capacitor is connected to the load This method reduces the ripple by regulating the amount of charge delivered to the load per clock cycle [22].
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