Charge pump system and charge pump protection circuit
A charge pump system may include a charge pump including a plurality of boosting units boosting an input voltage input to an input terminal multiple times depending on clock signals and outputting the boosted voltage to an output terminal; and a charge pump protection circuit including a series resistor unit disposed between the output terminal and a ground and including a plurality of resistors connected to each other in series. A portion of the plurality of resistors are disposed in parallel to a portion of the plurality of boosting units.
1. A charge pump system comprising:
a charge pump including a plurality of boosting units boosting an input voltage input to an input terminal multiple times depending on clock signals and outputting the boosted voltage to an output terminal; and
a charge pump protection circuit including a series resistor unit disposed between the output terminal and a ground and including a plurality of resistors connected to each other in series,
wherein a portion of the plurality of resistors are connected to a portion of the plurality of boosting units, in parallel.
2. The charge pump system of claim 1 , wherein a high voltage generating circuit generating a high voltage is connected to the output terminal, and the charge pump and the high voltage generating circuit are selectively driven.
3. The charge pump system of claim 1 , wherein boosting units, except for a boosting unit connected to the input terminal among the plurality of boosting units, correspond to a portion of the plurality of resistors, respectively, in a one-to-one scheme and are connected to a portion of the plurality of resistors, respectively, in parallel.
4. The charge pump system of claim 2 , wherein the charge pump protection circuit further includes a switch unit including a first switch disposed between the ground and one end of the series resistor unit and a second 5 switch disposed between the output terminal and the other end of the series resistor unit.
5. The charge pump system of claim 4 , wherein the charge pump protection circuit further includes a controlling unit providing a switching signal to the switch unit depending on a control signal input from the outside.
6. The charge pump system of claim 5 , wherein the controlling unit controls the first and second switches to be turned on in the case in which the high voltage generating circuit is operated and controls the first and second switches to be turned off in the case in which the charge pump is operated.
7. A charge pump protection circuit of protecting a charge pump including a plurality of boosting units boosting an input voltage input to an input terminal multiple times depending on clock signals and outputting the boosted voltage to an output terminal, comprising:
a series resistor unit disposed between the output terminal and a ground and including a plurality of resistors connected to each other in series,
wherein a portion of the plurality of resistors are connected to a portion of the plurality of boosting units, in parallel.
8. The charge pump protection circuit of claim 7 , wherein a high voltage generating circuit generating a high voltage is connected to the output terminal, and the charge pump and the high voltage generating circuit are selectively driven.
9. The charge pump protection circuit of claim 8 , wherein boosting units, except for a boosting unit connected to the input terminal among the plurality of boosting units, correspond to a portion of the plurality of resistors, respectively, in a one-to-one scheme and are disposed in parallel to a portion of the plurality of resistors, respectively.
10. The charge pump protection circuit of claim 9 , further comprising a switch unit including a first switch disposed between the ground and one end of the series resistor unit and a second switch disposed between the output terminal and the other end of the series resistor unit.
11. The charge pump protection circuit of claim 10 , further comprising a controlling unit providing a switching signal to the switch unit depending on a control signal input from the outside.
12. The charge pump protection circuit of claim 11 , wherein the controlling unit controls the first and second switches to be turned on in the case in which the high voltage generating circuit is operated and controls the first and second switches to be turned off in the case in which the charge pump is operated.