Low-voltage power-generating circuit and device thereof

Abstract

The invention discloses a low-voltage power-generating circuit and a device thereof, pertaining to the technical field of integrated circuits. The low-voltage power-generating circuit comprises a starting circuit, an error amplifying circuit, a current controlling circuit and a current-to-voltage converting and sampling circuit. The starting circuit generates starting signals to start the circuit,generates bias current control signals and starts the current signals; the bias current needed by the error amplifying circuit during the starting and the operation is controlled by the bias currentcontrol signals, the input end thereof receives the sampling and start voltage signals from the current-to-voltage converting and sampling circuit, and the output end thereof outputs the current control signals; the current control circuit controls the size of the current signals by the current control signals; and the current-to-voltage converting and sampling circuit samples the generated low-voltage output working power supply according to the requisite low-voltage output working power supply generated by the current signals to form sampled voltage signals which are fed back to the input end of the error amplifying circuit. The circuit and the device do not need external reference voltage or high temperature resistant metal oxide semiconductor (PMOS) elements after being specially connected.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a generating circuit of an internal low-voltage working power supply of a high-voltage integrated circuit and a low-voltage power generating device having the circuit. Background technique [0002] In the high-voltage integrated circuit IC (Integrated circuit), the vast majority of ICs, such as liquid crystal driver chips and switching power supply chips, have the situation of using multiple withstand voltage devices at the same time. The drive circuit is implemented with high-voltage devices, such as 20V, while the internal digital logic circuit is implemented with low-voltage devices, such as 5V. [0003] In the above-mentioned high-voltage ICs where multiple working power sources coexist, generally only the highest working power supply voltage of the IC needs to be provided externally, and then the required low-voltage power supply is generated through ...

AI Technical Summary

Problems solved by technology

[0006] There are two disadvantages in the circuit of the LDO structure: (1) The LDO needs other reference circuits to provide a reference voltage as the reference voltage VREF, so the reference circuit needs to generate a reference voltage first and input it to the LDO; (2) the current high-voltage IC integrated circuits mostly use CMOS (Complementary metal-oxide semiconductor) manufacturing process, therefore, in the LDO circuit of this structure, the PMOSFET and NMOSFET (Positive / Negative metal-oxide semiconductor filed effect transistor, PMOSFET / NMOSFET) devices in the error amplifier EA circuit are required to be both High Voltage Devices

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