Low dropout regulator
A low-dropout linear voltage regulator technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as long stabilization time, excessive output voltage jump fluctuations, etc., to reduce static power consumption, circuit Simple structure, the effect of improving transient response speed and accuracy
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[0020] Such as figure 2 The low dropout linear regulator (LDO) of the present invention shown includes a feedback circuit 100 and a reference voltage unit Vref connected to the negative electrode of the error amplifier EA. The reference voltage unit Vref is a bandgap reference circuit. The feedback circuit 100 is composed of a P-type MOS transistor structure first conductive element MP, a first resistor R1 and a second resistor R2. The gate of the first conduction element MP is connected to the output terminal of the error amplifier EA, the source of the first conduction element MP is connected to the power supply Vin, and the drain is connected to the output terminal Vout of the voltage regulator. A resistor branch and an external capacitor branch are connected in parallel between the output terminal Vout of the regulator and the ground. A first resistor R1 and a second resistor R2 are connected in series in the resistor branch, and a feedback signal Vfb is tapped between th...
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