Power management circuit, integrated circuit and overcurrent protection method thereof
An integrated circuit and circuit technology, applied in battery overcurrent protection, battery circuit devices, circuits, etc., can solve the problems of falling, unable to meet the power supply standards of Apple's mobile products, etc., and achieve the effect of meeting the power supply standards
Active Publication Date: 2021-04-09
CHENGDU MONOLITHIC POWER SYST
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- Description
- Claims
- Application Information
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Problems solved by technology
However, in the prior art, when the constant current control loop starts to work, the output voltage Vout will start to drop, which cannot meet the power supply standard of Apple's mobile products
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[0017] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.
[0018] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...
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The invention discloses a power management circuit, an integrated circuit and an overcurrent protection method thereof. The control circuit of the integrated circuit comprises a current limiting circuit, an over-current indicating circuit and an over-current threshold selection circuit. The current limiting circuit compares a current feedback signal representing the output current of the power supply management circuit with a current threshold signal, and generates a square wave signal at the output end. On the basis of the square wave signal, the over-current indicating circuit outputs an over-current indicating signal at the output end. On the basis of the over-current indicating signal, the over-current threshold selection circuit selects a first over-current threshold or a second over-current threshold as an over-current threshold, where the first over-current threshold is greater than the second over-current threshold. When the current feedback signal reaches an over-current threshold value, a constant-current control loop is adopted to control the output current to be constant, and when the current feedback signal does not reach the over-current threshold value, a constant-voltage control loop is adopted to control the output voltage to be constant.
Description
technical field [0001] The invention relates to an electronic circuit, in particular to a power management circuit, an integrated circuit and an overcurrent protection method thereof. Background technique [0002] figure 1 is a schematic diagram of a power management circuit 100 in the prior art. The integrated circuit 10 of the power management circuit 100 includes a power terminal IN, a power terminal PMID, a switch node terminal SW, a battery terminal BATT, a first switch Q1 and main power switches QH and QL. The power supply terminal IN is connected to an external power supply or an external load through a USB interface, so as to input a power supply voltage to the power management circuit 100 or output a power supply voltage to the external load by the power management circuit 100 . [0003] When it is detected that there is an external power supply voltage at the power supply terminal IN, the first switch Q1 is turned on, so that the voltage of the power supply termi...
Claims
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IPC IPC(8): H02M3/158H02M1/32H02J7/00
CPCH02M3/158H02M1/32H02J7/00304H02J7/0068H02J2207/20H03K17/0822H02M1/008H02M1/0009H02H3/006H02H3/087H02H3/023H02H1/0007H02H9/02H02M3/155H03K3/037
Inventor 曹海港易生勇
Owner CHENGDU MONOLITHIC POWER SYST