Power management circuit and chip thereof

Abstract

The invention provides a power management circuit and a chip thereof. The power management circuit comprises a pre-voltage stabilizing module, a linear voltage stabilizing module, and a bias current generation module. Input voltages sequentially pass through the pre-voltage stabilizing module, the linear voltage stabilizing module, and the bias current generation module to generate a pre-stabilized voltage VPR, a voltage stabilizing voltage VREG, and a bias current Ibias separately. The power management circuit in the chip provides a power supply voltage and a current bias for modules in the chip. The invention has the advantages that the circuit can generate stable voltages at high input voltage conditions to provide stable power supply for each module in a power management IC (IntegratedCircuits); output currents are stable, and the driving capacity is large; the power consumption of the power management circuit is low, helping to control the overall power consumption of the chip; and the circuit structure is easy to realize so as to be suitable for engineering application.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a power management circuit and a chip thereof. Background technique [0002] As we all know, the power supply voltage required by the functional modules in the battery management system is low, often below 5V. However, in some applications, the total voltage of the input series battery pack is higher, for example: 36V, 48V for electric bicycles, 400V for electric vehicles, etc. Therefore, how to convert the higher voltage of the battery pack into a low voltage suitable for the auxiliary power supply of the battery management system is the difficulty of the main system design. [0003] The analog, digital, control logic and other modules in the battery management chip (BMIC) need to work at a lower voltage, which requires converting the above-mentioned high voltage into a voltage or current suitable for the operation of these modules. And this requires a corresponding power ma...

AI Technical Summary

Problems solved by technology

[0005] 1) In the process of reducing the high-voltage input to the power supply voltage that can be used by the analog, digital, control logic and other modules in the BMIC, the complexity of the circuit design is often high, and large power consumption will be generated;

[0006] 2) Changes in the high-voltage input power supply often have an impact on the size of the regulated output, and at the same time, the circuit is often more complicated when the circuit realizes functions such as over-current and over-temperature protection under high input voltage;

[0007] 3) Changes in ambient temperature will affect the bias current provided by the circuit, resulting in inaccurate current bias

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