BP5122

BP5122 is a low temperature operating, low input voltage, high efficiency DC-DC switching regulator chip. It belongs to power supply integrated circuit (PMIC), and is classified under voltage regulators and DC-DC switching regulators. Thisdocument will discuss BP5122 application fields and working principle.

Application Fields
BP5122 is a DC-DC step-down switching regulator with low power, which is suitable for applications such as digital devices, IoT and digital home applicatiosn, automotive, industrial control and consumer electronics. For example, it can be used in the power supply of digital products such as WiFi and BT devices, bringing better stability. And it is also applicable for automotive, industrial and low voltage motor control systems, greatly improving the output accuracy and stability.

Working Principle
The principal operation of the BP5122 converts DC input voltage to a steady output voltage, which is accomplished by switching the current at a high frequency to obtain the desired switching effect. The BP5122 contains two voltage regulators, a high side one and a low side one, that switch on and off together to supply current to the load. When the high side circuit is closed, the current flows from the input voltage to the load, and when the low side circuit is closed, the input current flows back to the input where the energy is stored for future use.This process is repeated multiple times, each time the current is switched, some energy is transferred from the input to the output voltage. At the same time, the output voltage is kept steady by the integrated pulse width modulation (PWM) controller. By adjusting the duty cycle of the switching, the output voltage can be adjusted accordingly.

The BP5122 also provides a wide input voltage range of 4.5V to 24V and is available in either an adjustable output voltage option or a fixed output voltage option. It features a current limitation of 3A, low ripple noise, and high power efficiency of up to 95%. Furthermore, the chip also includes over-current protection, over-temperature shutdown and short circuit protection, improving safety and reliability of power supplies.

In conclusion, BP5122 is suitable for applications such as digital devices, IoT and digital home applications, automotive, industrial control and consumer electronics. Its working principle relies on controlling the pulse width modulation (PWM) which enables the switch to transfer current from the power supply to the load. Furthermore, its wide input voltage range and high power efficiency make it a reliable and safe choice for many different applications.