| 摘要 |
PURPOSE: A circuit device including a control-type charge pump is provided to use difference between the output voltage of a charge pump and a supply voltage, thereby controlling a closed loop. CONSTITUTION: A charge pump(100) is connected to a supply voltage connector in order to create a pump voltage(ULP) from a supply voltage(UBAT). Input terminals(201,204) of a closed loop control circuit(200) are connected to the output terminal(106) of the charge pump and the supply voltage connector in order to detect difference as a control variable from the pump voltage and the supply voltage. The closed loop control circuit compares a reference variable with the control variable. According to the comparison result, the output terminal(206) of the closed loop control circuit is connected to the control input terminal(101) of the charge pump in order to control the charge pump.
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