Low Dropout Regulator Circuit with Auxiliary Circuit
A low-dropout voltage regulator and circuit technology, applied in the field of circuits, can solve problems such as poor performance of the low-dropout voltage regulator circuit
Active Publication Date: 2018-01-26
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology
[0006] The problem solved by the present invention is that the performance of the low dropout voltage regulator circuit in the prior art is not good
Method used
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Embodiment Construction
[0030] It can be seen from the background art that the low dropout voltage regulator circuit in the prior art has poor performance.
[0031] The embodiment of the present invention provides a low-dropout voltage regulator circuit with an auxiliary circuit. In addition to the low-dropout voltage regulator circuit, it also includes an auxiliary circuit composed of a sampling circuit, a mirror circuit and a current source circuit. The low dropout voltage regulator circuit includes a power MOS transistor, and the drain of the power MOS transistor is used as an output terminal of the low dropout voltage regulator circuit to output a regulated voltage; the power MOS transistor is connected to the sampling circuit, The mirror circuit is connected to the current source circuit, so that the current of the power MOS transistor has a set proportional relationship with the current of the current source circuit, and the current source circuit is greater than the preset voltage The current ...
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The invention provides a low dropout voltage regulator circuit with an auxiliary circuit, comprising: a low dropout voltage regulator, a sampling circuit, a mirror circuit and a current source circuit, the low dropout voltage regulator includes a power MOS transistor, the power The drain of the MOS transistor outputs a regulated voltage; the sampling circuit is connected to the gate of the power MOS transistor, and the current of the power MOS transistor is sampled, and the current of the sampling circuit is consistent with that of the power MOS transistor. The current has a first proportional relationship; the mirror circuit connects the sampling circuit and the current source circuit, and makes the current of the sampling circuit and the current of the current source circuit have a second proportional relationship; the current source circuit The current value when the regulated voltage is greater than the preset reference voltage is greater than the current value when the regulated voltage is lower than the preset reference voltage. The low drop voltage stabilizer circuit with auxiliary circuit of the present invention can realize the functions of short circuit protection, soft start and current limit.
Description
technical field [0001] The invention relates to the field of circuits, in particular to a low-dropout regulator circuit with an auxiliary circuit. Background technique [0002] In electronic equipment, the power supply voltage may usually vary within a large range. For example, a lithium-ion battery in a portable device can provide a voltage of 4.2 volts when it is fully charged, and can only provide a voltage of 2.3 volts after discharge. The range of variation is very large. Big. The working circuit of electronic equipment usually requires a stable power supply voltage. Therefore, at present, a low dropout regulator (LDO: Low Dropout Regulator) circuit is usually added to the output of the power supply. Since the low dropout regulator has a set voltage regulation, It first converts the actual power supply voltage into the set regulated voltage, and then provides the converted regulated voltage to the working circuit, thus ensuring that when the power supply voltage of the...
Claims
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IPC IPC(8): G05F1/56
Inventor 柯可人
Owner SPREADTRUM COMM (SHANGHAI) CO LTD