Low Dropout Linear Regulator with High Power Supply Rejection Ratio
A high power supply rejection ratio, low dropout linear technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve the problem of affecting circuit stability, increasing the instantaneous current of power transistors, and damage to power transistors and subsequent loads, etc. question
Active Publication Date: 2022-04-01
SG MICRO
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Problems solved by technology
When the output voltage Vout rises from low, the N-type MOSFETMn1 and Mn2 will go through a start-up process. When the N-type MOSFET Mn1 and Mn2 are turned on, the output voltage will change suddenly, and the instantaneous voltage will be extremely large. Increase the instantaneous current in the power transistor, causing damage to the power transistor and the post-stage load, seriously affecting the stability of the circuit
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[0023] Various embodiments of the invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.
[0024] It should be understood that in the following description, a "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connections. When an element or circuit is said to be "connected to" another element or an element / circuit is said to be "connected between" two nodes, it can be directly coupled or connected to the other element or there can be intervening elements and the connection between elements can be be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled to" or "directly connected to" another element, there are no intervening e...
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The application discloses a low-dropout linear voltage regulator with high power supply rejection ratio, including an error amplifier and a power transistor, wherein the error amplifier includes a first input stage, a second input stage and a control circuit, and the first input stage includes a circuit for receiving A first transistor pair for outputting a voltage and a reference voltage, the second input stage includes a second transistor pair for receiving the output voltage and a reference voltage, the first transistor pair and the second transistor pair have different conduction types, and the control circuit is used according to The reference voltage controls the opening and closing of the first input stage, and turns on the first input stage when the reference voltage is less than the set threshold, so that the error amplifier can work normally, ensuring that the output voltage can change smoothly, and when the reference voltage is greater than the set threshold When the threshold is set, the first input stage is turned off, and only the second input stage works, so that the power supply rejection ratio of the low dropout linear regulator will not be affected.
Description
technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a low-dropout linear regulator with high power supply rejection ratio. Background technique [0002] A low dropout regulator (Low Dropout Regulator, LDO) converts an unstable input voltage into an adjustable DC output voltage, so as to be used as a power supply for other systems. Because linear regulators have the characteristics of simple structure, low static power consumption, and small output voltage ripple, linear regulators are often used for on-chip power management of mobile consumer electronics chips. [0003] Such as figure 1 A schematic circuit diagram of a high power supply rejection ratio low dropout linear regulator according to the prior art is shown. Such as figure 1 As shown, the low dropout linear regulator 100 includes a power transistor Mnp, an error amplifier 110 and a buffer 120 . The power transistor Mnp is used for providing the output volt...
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IPC IPC(8): G05F1/56
CPCG05F1/56G05F3/30G05F3/26
Inventor 林宇
Owner SG MICRO