Enabling circuit of power management chip

Abstract

The invention discloses an enabling circuit of a power management chip. The enabling circuit comprises N-type field effect transistors MN0, MN1, MN2, MN3, MN4 and MN5, diodes D1 and D2, resistors R1, R2 and R3, N-type field effect transistors MNE<1>... MNE<n-1> and MNE<n> and a power chip functional circuit; source electrodes of the N-type field effect transistors MNE<1>... MNE<n-1> and MNE<n> are grounded, drain electrodes are connected with a power supply after being connected with a power supply chip function circuit, and grid electrodes are connected with a grid electrode of the N-type field effect transistor MN0 after being connected. According to the invention, a conventional CMOS process design is adopted, the enabling circuit directly takes power from a chip power supply, and whether a power supply chip functional circuit needs to work normally or not is rapidly determined; a enabling control tube can adopt a field-effect tube with a low-voltage framework, the grid capacitance is small, the input control state of the chip can be quickly responded, the mask cost can be reduced during production, and the chip area can be saved.

Description

technical field [0001] The invention relates to an enabling circuit, in particular to an enabling circuit of a power management chip. Background technique [0002] There are many kinds of power management chips, including LDO, DC-DC, AC-DC and other different types, which are widely used in consumer electronics, home appliances, industrial applications and other fields. In the application process of the power management chip, in order to facilitate the control of the power management chip by the system, an enable pin is generally set outside the chip to realize different functions such as switching of the power chip and sleep wake-up. [0003] The traditional method of enabling the control circuit of the power management chip is to supply power from the internal regulated power supply of the chip, and the power comes from the converted regulated power supply inside the chip, and it takes a certain amount of time to establish it. In extreme cases, the power management chip n...

AI Technical Summary

Problems solved by technology

In extreme cases, the power management chip needs to respond quickly to the external enable control signal, otherwise the output of the chip may endanger the safety of the load carried by the chip

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