NCP1400ASN33T1G

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NCP1400ASN33T1G application field and working principle

NCP1400ASN33T1G is a high performance, low cost, low quiescent current voltage regulator for externally powered, high efficiency step down conversion applications. It is mainly used in the design and development of portable applications, mobile phones, and other battery powered products, as well as LED lighting, digital and audio systems, portable medical equipment and power supply applications.

NCP1400ASN33T1G belongs to PMIC - Voltage Regulators - DC DC Switching Regulators. It mainly originates from the buck converter. The buck converter is connected to the input voltage source and the load in series, and a diode is connected in parallel with the load. An inductor is connected between the output and the ground. The output voltage of the buck converter is generally lower than that of the input voltage.

The basic working principle of NCP1400ASN33T1G is that when the switch is turned on, the inductor stores energy, the current increases, and the coil voltage drops. When it drops to a certain voltage and the switch is automatically turned off, the energy stored in the inductor is released. Finally, the diode prevents the current from flowing backwards when the switch is turned off, so that the voltage sent to the load is kept constant.

NCP1400ASN33T1G is a monolithic integrated circuit (IC) which includes a high performance operating amplifier for voltage regulation, error amplifier and current mirror for over-current protection, low on-resistance switch with power up/enable/shutdown functions and control inputs. With the ultra-low quiescent current and low input voltage, it provides very efficient voltage conversion. The output voltage accuracy of NCP1400ASN33T1G is within ±1%, which can meet the requirements of most portable devices and other products.

In addition, NCP1400ASN33T1G offers two soft start modes, one is to use external capacitors to generate rising and falling ramp waveforms, and the other is to control the first time to enter the feedback resistor and dynamically adjust the feedback voltage to reduce the peak current impact. These features make NCP1400ASN33T1G a suitable choice for low power systems.

In conclusion, NCP1400ASN33T1G has many features such as low quiescent current and high efficiency, which makes it very suitable for mobile applications, portable electronic devices, LED lighting, digital and audio systems, portable medical equipment, etc. With its external capacitor or internal feedback resistor soft start function, it can provide periodic start stability and current limitations to protect the output from high reverse current.

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