Contents
What is a charge-pump converter?
Charge-pump voltage converters accomplish energy transfer and voltage conversion using charges stored on capacitors, thus the name, charge-pump. Using switching techniques, charge pumps convert supply voltage of one polarity to a higher or lower voltage, or to an alternate polarity (at either higher or lower voltage).
How does a charge-pump work?
The charge pump uses capacitors as the energy-storage element. In the basic execution of this power-conversion technique, current (charge) is alternately switched and directed between two capacitors arranged so the circuit output is twice the input, and thus functioning as a voltage-doubling boost converter.
Why do we use charge pump in PLL?
Charge pump make use of switching devices for controlling the connection of voltage to the capacitor. Charge pump is one of the important parts of PLL which converts the phase or frequency difference information into a voltage, used to tune the VCO.
Which is better charge pump or boost converter?
Both charge pumps and boost converters seem to serve the same purpose. Would charge pumps be preferable given that it does not use inductors? What are the pros and cons of charge pumps versus boost converters as DC-DC converters? Boost converters can be efficient at a continuous range of voltage ratios.
Why are charge pumps used as voltage converters?
Charge pumps are inherently inefficient when used as voltage converters: charging (or discharging) a capacitor loses some energy. Always. Even with ideal components. An ideal inductor-based voltage converter can be lossless. An inductor-based current converter has the same problem as a capacitor-based voltage converter.
How is the max1573 charge pump Maxim Integrated?
The MAX1573 obtains its class-leading efficiency by including 1x pass-through and 1.5x boost charge-pump modes, adaptive mode switchover, and very low-dropout linear current regulators to stay in the more efficient 1x mode for as long as possible as while the battery declines.