BM2P249Q-Z

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Power Management Integrated Circuit (PMIC) is a complex integrated circuit used for managing the power and electrical systems on a device to fulfill performance, energy efficiency, and reliability requirements. PMICs combine a variety of power and energy management functions such as voltage regulation, current regulation, power-on reset, and over-power protection into one integrated circuit. In this article, we will look at the application field and working principle of the BM2P249Q-Z, one of the latest PMICs from Bosch.

The BM2P249Q-Z is a PMIC designed for AC/DC converters and offline switchers that are used in a wide range of applications such as LED lighting, adapters and chargers, server and IT, and industrial, among others. The PMIC features output currents up to 1.5A and features ultra-fast and precise current-mode control to ensure minimal harmonic distortion. It also supports over-voltage, over-temperature and short-circuit protection, making it ideal for high-performance, cost-effective switch mode power supply designs.

The BM2P249Q-Z has two integrated power transistors: one for the PWM and one for the reference cycle. The PWM module includes three PWM switching elements as well as an overvoltage protection element. The reference cycle module is used to fine-tune the operating frequency of the device, ensuring optimal operation under varying load conditions. In addition, the PMIC includes an integrated on/off switch and an integrated pseudo-RC oscillator.

The working principle of the BM2P249Q-Z is based on current-mode control, which ensures stable and highly efficient operation. This type of control tracks the output current and compares it with the configured reference current. When the output current is lower than the reference current, the module behaves like an open loop system, increasing the switching frequency and output voltage until the correct output current is reached. When the output current is higher than the reference current, the module behaves like a closed loop system, decreasing the switching frequency and output voltage until the correct output current is reached.

The BM2P249Q-Z features an integrated current-mode loop compensation network, allowing for precise control of the frequency as well as precise adjustment of the output voltage. In addition, the device includes an integrated frequency scaling circuit which can reduce the switching frequency during light load conditions, further improving efficiency.

The BM2P249Q-Z PMIC is suitable for a wide range of AC/DC converter and offline switcher applications, providing designers with an efficient, reliable and cost-effective solution. The PMIC provides ultra-fast current-mode control, ensuring high power conversion efficiency, while the integrated frequency scaling circuit helps to optimize system performance in light load conditions. In addition, the device is equipped with overvoltage, over-temperature and short-circuit protection, making it a reliable and safe choice for switch mode power supply designs.

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