NCP303LSN34T1G Integrated Circuits (ICs)

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Power managementintegrated circuit (PMIC), also known as Power Chip, is a devicethat combines several functions of power management intoa single integrated circuit. Among the various power chips, Supervisors,as one of the most important components, are usually usedto regulate and supervise the operation of the circuits andmachines in the entire power system by controlling the workingstate of the device, providing independent reset signals andmonitoring power supply voltages. Among them, NCP303LSN34T1G,developed by ON Semiconductor, is a Supervisors with bothPowerOK and low voltage detect functions.

NCP303LSN34T1G is a linear Supervisors, which is generallyused as a support power supply circuit. It has a minimum operatingvoltage of 2.0V and a maximum operating voltage of 6.25V.It is available in two packages, SOT23-3 and SOT-23-5. It can beused in a variety of situations, including clocked logic circuits,microprocessor systems, digital systems and analog circuits.Its main function is to provide a signal to the system whenthe power supply is stable and meets the requirements, aswell as to provide another reset signal when the voltage istoo low.

The reset signal generated by NCP303LSN34T1G can bedivided into two types: power off reset (POR) and lowvoltage reset (LVR). POR is usually used when the systemis turned on, and the signal will be set when the power isapplied. On the other hand, LVR is an independentstep-down reset signal when the voltage of the powersupply is too low, and the signal will be set when thevoltage drops below a certain threshold. In addition, thePowerOK signal is issued when the power supply meetsthe requirements, so that the system can control thepower supply status by judging the PowerOK signal.The delayed reset signal consists of two components:assert delay and hold delay.

The structure of NCP303LSN34T1G is like an operationalamplifier, and it can be viewed as a voltage-controlledcomparator. For example, the power-on reset function isrealized by setting a silicon amplifier to the invertinginput terminal of the operational amplifier. With a pull-upresistor, the voltage at the non-inverting input terminal ofthe amplifier can be adjusted, and the output terminal canbe maintained at high state when the power supply voltageof the system is higher than the required value.

The working principle of NCP303LSN34T1G is simple,but effective,and its rigorous protection of the power supply can reducethe damage caused by voltage fluctuations, ensuring thesafe and reliable operation of the system and electronicdevices. Furthermore, its current consumption is alsorelatively small, which is conducive to reduce powerconsumption and extend battery life. Therefore, NCP303LSN34T1Gis widely used in a variety of applications, includingportable electronic products, automotive electronics,smartphones and wearable terminals.

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