BU4347FVE-TR

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The BU4347FVE-TR is a member of ROHM Semiconductor’s Power Management IC (PMIC) series of Supervisors. It is a highly integrated circuit designed to monitor the regulated voltage from an external source and protect the main power voltage from outages.

The BU4347FVE-TR is suited for use in a wide range of applications, such as a battery powered device, an always-on standby system, or a system that is sensitive to power outages. The BU4347FVE-TR provides an output voltage accuracy within ±1%, and an output voltage range from 0.8V to 16V.

The BU4347FVE-TR is a multi-functional Power Management IC (PMIC), and includes the following features:

• VOUT_DIS - Output disconnect function to prevent inrush current
• UVLO (Under Voltage Lock Out) with hysteresis to avoid overloads
• HSLED (High Side LED) - A dedicated pin that can be used as a PWR LED
• Integrated watchdog timer - Detects any failures and reset system
• Low power standby mode - Allows the system to run at the lowest power possible
• Active power down enabling - Auto power down enables the system to go into sleep mode when the system is not in use
• Fixed frequency PWM mode - Reduces the EMI and allows for a higher voltage accuracy

The BU4347FVE-TR employs a hysteretic PWM (pulse-width modulation) controller, which works by measuring the output voltage of the main power source and controlling the pulse width of the output voltage to maintain the output voltage within a certain range. This reduces the EMI (electromagnetic interference) and provides a higher accuracy compared to the feedback control of other PWM controllers.

The BU4347FVE-TR also has an integrated watchdog timer and power down enable. The watchdog timer is used to detect any failures in the system, and reset the system if a failure is detected. The power down enable allows the system to go into sleep mode when the system is not in use, reducing the power consumption and extending the battery life of the device.

In addition, the BU4347FVE-TR has an output disconnect function, which prevents any inrush currents when the system is turned on, as well as an Over Voltage Lock Out (OVLO) which works by shutting down the system if the output voltage goes above a certain threshold.

Overall, the BU4347FVE-TR is an excellent member of the Power Management IC (PMIC) series of Supervisors, and provides an accurate output voltage, with low EMI, and an extended battery life. The integrated Watchdog timer, Output Disconnect and the Over Voltage Lock Out provide a level of protection, ensuring the system is always running at optimum performance.

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