Low dropout regulator and voltage stabilization method

A low-dropout linear and voltage regulator technology, applied in the power supply field, can solve problems such as power supply system instability, and achieve the effect of power supply system stability

Inactive Publication Date: 2018-11-13
VIVO MOBILE COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a low-dropout linear regulator and a voltage stabilizing method to solve the problem in the prior art that the input voltage of external equipment changes with the load current, resulting in an unstable power supply system

Method used

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  • Low dropout regulator and voltage stabilization method

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Embodiment 1

[0024] refer to figure 1 , shows a schematic structural diagram of a low dropout linear regulator LDO provided by an embodiment of the present invention. The LDO includes a voltage compensation circuit 11 and a voltage stabilizing circuit 12, and the output terminal of the voltage stabilizing circuit 12 is connected to an external device 22 through a circuit board connection 21;

[0025] The voltage compensation circuit 11 is configured to determine the loss voltage of the circuit board connection 21, and compensate the first reference voltage according to the loss voltage to obtain a second reference voltage;

[0026] The voltage stabilizing circuit 12 is configured to adjust the output voltage of the LDO according to the second reference voltage.

[0027] In this embodiment, the LDO is connected to the external device 22 through the circuit board connection 21. Due to the resistance of the circuit board connection 21, the operating current of the external device 22, that is...

Embodiment 2

[0050] refer to Figure 4 , shows a flowchart of steps of a method for stabilizing voltage provided by an embodiment of the present invention. Applied to the LDO as described in Embodiment 1, the LDO includes a voltage compensation circuit 11 and a voltage stabilizing circuit 12, and the output terminal of the voltage stabilizing circuit 12 is connected to an external device 22 through a circuit board connection 21; the method includes:

[0051] Step 201, according to the voltage compensation circuit 11, determine the loss voltage of the circuit board connection 21, and compensate the first reference voltage according to the loss voltage to obtain a second reference voltage.

[0052] In this embodiment, the voltage compensation circuit 11 determines the loss voltage Vab of the circuit board connection 21, specifically, detects the load current of the LDO, and obtains the resistance value of the circuit board connection; according to the load current and the Calculate the loss...

Embodiment 3

[0057] refer to Figure 5 , an embodiment of the present invention provides a structural block diagram of a power management chip. The power management chip includes a plurality of LDOs as described in the first embodiment.

[0058] In this implementation, the power management chip 30 may include multiple LDOs, for example, LDO1, LDO2, LDO3, and LDO4, and the LDOs are connected to external devices through circuit board connections. Considering the loss voltage on the connection line of the circuit board, the first reference voltage of the LDO is compensated to obtain the second reference voltage, so that the LDO can adjust the output voltage of the LDO according to the second reference voltage, thereby ensuring the stability of the input voltage of the external device, and The load current is independent of the resistance of the board wiring.

[0059] To sum up, in the embodiment of the present invention, the power management chip includes a plurality of LDOs, the input volt...

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Abstract

The invention provides a low dropout regulator (LDO) and a voltage stabilization method. The LDO comprises a voltage compensation circuit and a voltage stabilization circuit, and the output end of thevoltage stabilization circuit is connected with external equipment through a circuit board connecting wire; the voltage compensation circuit is used for determining the loss voltage of the circuit board connecting wire and compensating for first reference voltage according to the loss voltage to obtain second reference voltage; the voltage stabilization circuit is used for adjusting the output voltage of the LDO according to the second reference voltage. In the embodiment of the LDO, no matter how a working current of the external equipment changes, in other words, no matter how a load current of the LDO changes, stable input voltage can be obtained at the input end of the external equipment, and accordingly it is ensured that a power supply system is stable and reliable.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a low-dropout linear regulator and a voltage stabilizing method. Background technique [0002] In the power supply system of the mobile terminal, the PMIC (Power Management IC, power management integrated circuit) provides multiple LDOs (Low dropout regulators, low dropout linear regulators) with different output voltages, and the output of each LDO passes through the PCB (Printed Circuit Board, printed circuit board) traces are connected to external devices to supply power to external devices. [0003] Under normal circumstances, the voltage input from the LDO to the external device is stable. However, due to the resistance of the PCB traces, when the load current of the external device changes, the voltage input to the external device will also change accordingly, thus causing the instability of the power supply system. Contents of the invention [0004] Embodiments ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 王志升
Owner VIVO MOBILE COMM CO LTD
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