Multi-operating-mode charge pump overshoot current limiting device

Abstract

The invention discloses a multi-operating-mode charge pump overshoot current limiting device, and mainly solves the problem that a charge pump is over high in overshoot current and low in battery durability in the starting stage and the mode converting process. The device comprises a starting circuit (1), a current segmenting circuit (2), an error amplifier (3), a logic control and drive circuit (4) and an output and feedback circuit (5). In the starting stage, constant load current Ibias is supplied by the starting circuit (1) to limit input current; and in the normal operating stage, a constant current source in the starting circuit (1) is shut down, the error amplifier (3) is controlled to output an adjustable current signal Igm according to a logic control signal SC output by the current segmenting circuit (2), and the adjustable current signal Igm is enlarged in four segments, so that the overshoot current in the mode converting process is limited. By adding the starting circuit into a charge pump circuit, overshoot current of an input end of the charge pump in the starting stage and the mode converting process is low, the durability of a battery is improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a multi-working mode charge pump overshoot current limiting device, which can be used for analog integrated circuits. Background technique [0002] The charge pump circuit is a very important power management circuit widely used in portable products such as mobile phones, digital cameras, notebook computers, and tablet computers, as drivers for LED displays, USB, SD cards, etc. Compared with other commonly used power management circuits, it has obvious advantages: compared with linear regulators, its biggest advantage is high efficiency and large load current; compared with switching power management circuits, its biggest advantage is output The voltage ripple is small, the peripheral circuit is simple, and no inductance device is used. The charge pump circuit has a very significant advantage in applications that need to provide stable output voltage and output curre...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of current overshoot of the traditional charge pump, and provide a multi-working mode charge pump overshoot current limiting device, so that the charge pump has a small input current and a long battery working time during the start-up phase and the mode conversion phase. , good durability

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