The correct selection of the power adapter ic chip plays a crucial role in the adapter, which is related to the stability and service life of the power adapter. The correct selection of the power adapter ic chip can not only prolong the service life of the product, but also reduce the failure of the product. The choice of power IC is not only to meet the requirements of circuit performance, but also to consider the volume of the product.

The following editor will tell you how to choose the power adapter ic chip?

1. Use the best LDO conditions: the boost DC/DC converter has high efficiency but large ripple and noise voltage, and the low dropout linear regulator has low efficiency but the smallest noise. The combination of the two forms a dual-output power supply IC It can better solve the problems of efficiency and noise. When the ripple and noise in the output voltage are required to be particularly small, the input and output voltage difference is not large, and the output current is not greater than 100mA, using micro power consumption, low dropout (LDO) linear stabilization. A voltage regulator is the most suitable and suitable for most portable product applications.

2. When a negative power supply is required, try to use a charge pump: most portable instruments require a negative power supply, and the current demand is not large. It is the simplest to use a charge pump IC to form a voltage inversion circuit. If low noise or output voltage regulation is required, it can be used Charge pump IC with LDO linear regulator.

3. Avoid high-precision selection of appropriate IC chips: Generally speaking, the accuracy of power supply ICs is between 2% and 4%, and some high-precision ones can reach 0.5% to 1%. A suitable power supply IC chip can not only reduce costs but also reduce costs. It can improve the stability of the circuit. If your circuit does not use the power-off function, and there is no microprocessor or microcontroller in the switching power supply structure, you may not choose a device with a power-off function or output power supply working status signal, which not only can Reducing the size of the power IC can also reduce the overall cost, so why not.

4. Select the matching power adapter IC chip: The three main parameters of the power IC are the input voltage VIN, the output voltage Vo and the maximum output current Iomax. Through these three requirements, the line‘s demand for the power supply IC can be determined to avoid taxis To pull the trolley and avoid the problem of overloading the power supply IC, in the operation of the power adapter, the maximum current value is preferably 70-90% of the maximum output current lomaxde of the power adapter IC chip.