The amount of charge transferred depends upon the load current and the switching frequency. During the time the pump capacitor is charged by the input voltage, the output capacitor C2 must supply the load current. The load current flowing out of C2 causes a droop in the output voltage which corresponds to a component of output voltage ripple.
Note that this circuit is neither a doubler nor inverter, but only a voltage replicator. The pump capacitor is C1, and the initial charge on C2 is zero. The pump capacitor is initially charged to VIN. When it is connected to C2, the charge is redistributed, and the output voltage is VIN/2 (assuming C1 = C2).
The two most common switched capacitor voltage converters are the voltage inverter and the voltage doublercircuit shown in Figure 4.1. In the voltage inverter, the charge pump capacitor, C1, is charged to the input voltage during the first half of the switching cycle.
The most fundamental charge-pump converter is the boost, while the charge-pump doubler is the most basic of boost configurations. In this topology, the switching capacitor is charged from the input voltage to ground in the first phase, and then connected between the input voltage and output voltage.
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Figure 1 is a simplified circuit diagram of an unregulated charge pump. The charge pump operates in two phases: During the charge phase, switches S1 and S4 are open and …
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A charge pump circuit, or charge pump regulator, is a kind of DC-DC converter that leverages switched-capacitor techniques to either increase or decrease an input voltage level.
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By creatively charging and discharging the switching capacitor (also called a flying capacitor) through the connection of an array of internal MOSFET switches, a charge pump …
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Charge-pump basics Operation Through the use of a few small and inexpensive external capacitors, a charge-pump converter can convert one DC voltage just like a magnetic …
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The fundamental mode of operation of a charge-pump can be understood by considering the two primary functions it performs: charge transfer and voltage conversion. In …
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The voltage doubler works similarly to the inverter; however, the pump capacitor is placed in series with the input voltage during its discharge cycle, thereby accomplishing the …
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A charge pump circuit, or charge pump regulator, is a kind of DC-DC converter that leverages switched-capacitor techniques to either …
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The LM2776 CMOS charge-pump voltage converter inverts a positive voltage in the range from 2.7 V to 5.5 V to the corresponding negative voltage. The LM2776 uses three low-cost …
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The output voltage ripple results primarily from the charging and discharging of the storage capacitor as well as the ESR if the capacitance is large enough. Using a ceramic …
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Inverter/Doubler Description The CAT661 is a charge−pump voltage converter. It can invert a positive input voltage to a negative output. Only two external capacitors are needed. With a …
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Conventional charge pumps utilize hard‐switching charge transfer from one capacitor to another. This results in inrush currents and high current spikes if the voltage …
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