BU4335F-TR

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Power management integrated circuit (PMIC) is an electronic device that provides an interface between the power supply system and the electronic device, and is widely used in the field of electronic products. PMIC is mainly divided into DC/DC converter, linear regulator, switch-mode power supply, regulator and driver, supervisor, etc., of which the supervisor is used to monitor power supply voltage and protect chip from excessive voltage or current. The article introduces the application field and working principle of BU4335F-TR, which is a type of supervisor.

The Application Field of BU4335F-TR

BU4335F-TR is a system-level power supervisor developed by ROHM, which can be used in both main systems and sub-systems. As a system-level power supervisor, BU4335F-TR can monitor multiple power rails, providing accurate voltage and current monitoring functions. The BU4335F-TR is suitable for various system power supervision applications, including high-end mobile phones, tablet PCs, laptop computers, automotive electronics and industrial control equipment.

Features of BU4335F-TR

Generally speaking, the working voltage range of BU4335F-TR is from 2.4V to 5.5V, with a typical operating voltage of 3.3V, which can be applied to various voltage power management systems. Moreover, it has advanced features, such as over current protection, over temperature protection and soft start circuit, which can provide over current protection and temperature protection to the system to make it work safely. In addition, the built-in soft start circuit can reduce the inrush current to prolong the life of the system.

Functional Block Diagram of BU4335F-TR

The functional block diagram of BU4335F-TR is shown in Figure 1. BU4335F-TR is composed of chip enable, voltage supervisor, power-on reset (POR), programmable supply monitor, programmable reset timer, interrupt request (IRQ) and reset pulse generator functions.

Figure 1: The Functional Block Diagram of BU4335F-TR

The central unit of BU4335F-TR is chip enable block, which is used to enable or disable the whole chip through an external signal. The voltage supervisor block is used to monitor the voltage of power rail and generate reset signal when power rail voltage is lower than the threshold. The power-on reset (POR) can detect the power rail voltage and generate reset signal to initialize the system when the voltage rises to a certain level. The programmable supply monitor can be used to monitor the voltage of system supply rail and generate reset signal to protect system when the voltage is lower than the preset limit. The programmable reset timer can generate "watchdog" reset signal to protect the system when an unexpected system reset occurs.

Working Principle of BU4335F-TR

The working principle of BU4335F-TR is shown in Figure 2. Firstly, when the external power supply is turned on, the chip enable signal is turned on. The power rail voltage is monitored by the programmable supply monitor, and the voltage supervisor will generate a reset signal when the voltage is lower than the low-voltage detection threshold. Simultaneously, the POR will detect the rising of power supply voltage and generate reset signal to initialize the system. After that, the programmable reset timer detects the system running status and generate reset signal to protect system when an unexpected system reset occurs.

Figure 2: The Working Principle of BU4335F-TR

BU4335F-TR also has over current protection function, which can be enabled by configuring the OCP settings. When the current exceeds the set limit, the OCP module will generate an interrupt request signal to notify the system that the current is too high. At the same time, it will also reduce the current to protect the system from damage.

Conclusion

In conclusion, BU4335F-TR is a powerful and multi-functional system power supervisor, which can be used in various system power supervision applications. It has advanced features, such as over current protection, over temperature protection and soft start circuit. Moreover, it can accurately monitor the voltage and current of system power rails, and generate reset signals to protect the system from damage. Therefore, BU4335F-TR is a powerful and reliable supervisor for various power management system applications.

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