STARTING CIRCUIT OF POWER MANAGEMENT CHIP, AND POWER MANAGEMENT CHIP

摘要

A starting circuit (10) of a power management chip, comprising: a starting capacitor (C3) which is used for connecting a power supply via an external resistor (R2) to perform charging; a switch circuit (100) which is connected between the external resistor (R2) and the starting capacitor (C3); a voltage detection circuit (200) which is used for detecting a voltage on the starting capacitor (C3) and is connected to the switch circuit (100) so as to control the on/off switching of the switch circuit (100); and a voltage maintaining circuit (300) which is connected between the starting capacitor (C3) and an operating circuit of the power management chip and is used for acquiring a voltage that maintains the starting capacitor (C3) from the operating circuit of the power management chip, wherein when the voltage detection circuit (200) detects that the starting capacitor (C3) reaches the starting voltage of the power management chip, the broken circuit of the switch circuit (100) is controlled. Further provided is a power management chip including the above-mentioned starting circuit (10). Disconnecting an external power source from the starting capacitor after the operating circuit of the power management chip is started can reduce the electric energy consumption.

主权项

1. A starting circuit of a power supply management chip, comprising:
a starting capacitor configured to be connected to a power supply through an external resistor to be charged; a switching circuit configured to be connected between the external resistor and the starting capacitor; a voltage detecting circuit to detect a voltage on the starting capacitor, and configured to be connected to the switching circuit to control on/off of the switching circuit; a voltage maintaining circuit configured to be connected between the starting capacitor and a work circuit of the power supply management chip to obtain a voltage for maintaining the starting capacitor from the work circuit of the power supply management chip; wherein when detecting a voltage of the starting capacitor reaches a starting voltage of the power supply management chip, the voltage detecting circuit controls the switching circuit to turn off.