Since it is used as a low dropout voltage regulator, the first feature is the extremely low input and output voltage difference, and secondly, it also has stable voltage output, low noise, small ripple, small size, and simple peripheral circuits. If an LDO regulator is used when planning a circuit, it is generally necessary to consider at least four factors: quiescent current, input and output voltage dropout, noise, and ripple ratio.
(1) Quiescent current IQ: IQ is an important planning parameter of a low-dropout linear regulator, which can be understood as the current consumed by the IC itself without signal output, and now the products are becoming more and more miniaturized, and at the same time require lower power consumption, such as STM32 high-performance chips, its power consumption can be as low as 2μA. Based on this, many portable electronic products, especially those with batteries, prefer to use low-power LDO products, which have a long use time due to low standby power consumption;
(2) Input and output voltage difference VDROP: LDO requires that the input voltage should be slightly greater than the output voltage, that is, VDROP=Vin - Vout, this difference should not be too large, otherwise the voltage stabilization accuracy will be affected, and it can be seen that LDO can only step down but not boost;
(3) Noise: Noise is actually a general term, which is an important reference element to measure the excellence of a power supply product, including coupling, resonance, etc.;
(4) Ripple press ratio: The ratio of the change amount of the power supply to the change of the output is the ratio of the output signal affected by the power supply, which reflects the ability of the LDO to press the signal source.
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