BU4224F-TR

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Introduction

The BU4224F-TR is a CMOS voltage supervisor and voltage detector IC from ROHM that suits the needs of portable and car electronics providing power supply reset and low voltage detection. It offers flexible detection levels, reset outputs and active-high/active-low selections. This IC is found in CD players, DVD players, digital cameras, portable and car electronics and various other types of devices.

Application Field

The BU4224F-TR voltage supervisor IC finds use in CD and DVD players, digital cameras, several types of portable and car electronics, games, HDD and software protection circuits, interrupt circuits and various other types of applications that require power supply reset or low voltage detection. With wide operating power supply voltage of 2V to 20V, the IC can quickly reset itself upon the detection of a low voltage. The detection voltage and reset threshold can be programmed using external resistor and capacitor, respectively.

Working Principle

The BU4224F-TR voltage supervisor IC integrates high-side P-channel MOSFET and low-side N-channel MOSFET, which enables it to support power supply voltage from a wide range of 2V to 20V. The IC includes an oscillator and a voltage detector circuit that performs power supply reset signals when the input voltage decreases. It is capable of maintaining a stable output even when there is a large current variation or temperature change, making it suitable for today\'s electronic products. The external resistor is connected to the REF pin and the voltage detector senses the input voltage applied to GND pin at every oscillation frequency. If this input voltage is lower than the detection voltage, the RESET pin output terminals (RESET pin and RESETB pin) toggle, resetting any internal and external devices upon the detection of a low voltage.The reset voltage can also be set using an external capacitor connected to the RST pin. The capacitor must be charged then discharged to the VREF point or the GND point. The RST pin output terminals (RST pin and RSTB pin) will also toggle depending on the time taken for the capacitor to become charged or discharged.

Conclusion

The BU4224F-TR voltage supervisor and voltage detector IC from ROHM is ideal for portable and car electronics requiring power supply reset and low voltage detection. It offers flexible detection levels, reset outputs and active-high/active-low selections. The IC finds usage in CD players, DVD players, digital cameras, games, HDD and software protection circuits, interrupt circuits and various other types of applications.

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