The invention relates to a power-on overshoot suppression circuit applied to a
linear regulator. The power-on overshoot suppression circuit comprises a power-on
delay control module, an inverse ratio pull-down module and a
positive feedback module, wherein the power-on
delay control module comprises a switching tube, a second field-effect tube, a first
resistor, a second
resistor and an external regulation
capacitor, the source
electrode of the switching tube is connected with a power supply
system, the drain
electrode of the switching tube is connected with the source
electrode of the second field-effect tube, the grid electrode of the second field-effect tube is grounded after passing through the second
resistor and the external regulation
capacitor which are connected in series, the first resistor is connected between the source electrode and the grid electrode of the second field-effect tube in parallel, the inverse ratio pull-down module is connected between the drain electrode of the second field-effect tube and the ground, the
positive feedback module is connected between the drain electrode of the second field-effect tube and the grid electrode of the switching tube, and the drain electrode of the switching tube is connected with the input end of the
linear regulator. The power-on overshoot suppression circuit has the advantages of enabling the
linear regulator to work after a power supply becomes stable and effectively suppressing power-on overshoot, being convenient for being interfaced with a linear
regulator circuit and being convenient to apply.