Patent ID: 7417491
Filing Date: 2008-08-26
Classification: H02M

Abstract:
1. A constant current output charge pump comprising: a switch module configured to compare a reference voltage with a load voltage, and output a switch signal; a voltage margin control module configured to compare a first voltage and a second voltage with an output voltage, and output a voltage margin control signal; a clock control module configured to capture the switch signal by the switch module and the voltage margin control signal by the voltage margin control module and output a first clock signal and a second clock signal based on a system clock; a charge pump module configured to capture the first clock signal and the second clock signal outputted by the clock control module so as to boost an input voltage for outputting the output voltage; a current control module configured to capture the output voltage outputted by the charge pump module so as to adjust current for outputting the load voltage; and a load module having an anode which is electrically connected to the load voltage of the current control module, and a cathode which is electrically connected to a ground level.