In the gain phase, SW1 and SW2 are closed while SW3 and SW4 are open. The operation of this circuit is in two phases: the gain phase and the common phase. To get a better understanding of how charge pumps work, we’ll now look at a fundamental example: the voltage doubler circuit.Īs shown in Figure 2, our voltage doubler circuit consists of one single capacitor controlled by four surrounding switches.įigure 2. Charge pumps work to exploit this behavior in order to manipulate the voltage across a capacitor through the use of carefully timed switches.Ĭharge Pump Voltage Doubler Circuit Example Since this is not physically possible, we see that a capacitor cannot abruptly change the voltage across its terminals. As defined by the capacitor I-V equation, in order for a capacitor to change its voltage instantaneously, it would require an infinite amount of current. Through alternatively charging and discharging capacitors, a charge pump can increase or decrease a given input voltage to the desired level.įrom a lower-level perspective, charge pump circuits work on the basic principle that the voltage across a capacitor cannot change instantaneously. Schematic of a simple charge pump circuit. With that in mind, let's explore charge pump circuits, the fundamentals of how they work, and their applications.Ī 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.Īs shown in Figure 1, these circuit blocks generally consist of nothing but capacitors and switches (i.e clock-controlled field-effect transistors or FETs) and work by carefully timing and controlling these switches to exploit the charge transfer characteristics of capacitors. Discrete designs usually use diodes rather than transistors to implement the required switching operation.įigure 1. While there are many applications and use cases for switched-capacitor circuits, one of the most fundamental is the charge pump circuit. The product is designated with the ear99 code number.įor more information please check the datasheets.In a previous article, we introduced the concept of switched capacitor circuits, how they work, and why they’re a valuable technique in analog circuit design. Moreover, it corresponds to ecw-f2823, a base product number of the product. It is assigned with 0.591" (15.00mm) of lead spacing. The product ecw-f(b), is a highly preferred choice for users. The product is available in through hole configuration. Its typical moisture sensitivity level is 1 (unlimited). The product features pc pins termination style. The product is widely employed in high frequency, switching. Moreover, the product is constructed from highly polypropylene (pp), metallized dielectric material. It has the maximum seated height of 0.591" (15.00mm). The product has -25°c ~ 85°c operating temperature range. It provides a 0.082 µf of capacitance value. It is assigned with possible HTSUS value of 85. The manufacturer part number is ECW-F2823JB. This is manufactured by Panasonic Electronic Components.
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