BU4343F-TR

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Supervisors are typically ICs for supervising power supplies and controlling power-sequencing and system-reset functions. In that gauge, the BU4343F-TR from ROHM Group is a supervisor IC designed for systems where low voltage operation and high-speed reset are required. It offers a reset operation of a maximum of 0.5 μs and reset detection voltage of 0.9V, while boasting an industry leading low operating voltage of 0.5V (typ. 0.45V).

Its ideal applications are advanced industrial equipment and home appliances such as refrigerators, washing machines, and air conditioners. Any application that requires an extended input voltage range, which cannot be provided by a traditional micro-controller reset circuit and requires highly efficient operation can be managed by the BU4343F-TR without any problems or complications.

Features

• Minimum reset detection voltage: 0.9V (typ.)
• Minimum operating voltage: 0.45V (typ.)
• External voltage: 4.5V to 20V
• Maximum reset operating time: 0.5 μs (typ.)
• Various reset conditions: Primary power monitor and 0.4V-reference condition
• Overvoltage protection: UVLO detection, UVLO hysteresis, OVLO detection
• Current Consumption: 0.8μA (max.)
• Input Hysteresis

The BU4343F-TR monitors and controls the power-sequencing needs of the system and it features a built-in circuit called Power-on Reset (POR) in order to guarantee stable operation. It also features a UVLO (Under-voltage lock-out) function which prevents the IC from operating when the primary supply voltage falls below the lower limit. In addition, it has an OVLO (Over-voltage lock-out) function which prevents the IC from operating when the primary supply voltage goes above the upper limit. It is available in a small, 10pin TSOPJW package and is ideal for designing products with a minimal number of external components.

The BU4343F-TR features an adjustable reset delay time, adjustable reset hold time and the ability to generate push-pull output, open drain output or both types to provide pulse reset in digital systems. This integrated circuit also offers detection circuits such as manual reset input (HR) and digital reset input (DT) as well as an accurate reset circuit for early detection. In addition, a watchdog timer (WDT) function is available with a variety of time ranges from several hundred milliseconds to several minutes.

Working Principle

The BU4343F-TR monitors the input voltage of the primary power supply, raises the reset signal when the voltage drops below the specified level and generates an interface signal for the system Reset. This signal changes the logic state to “low” and demands a Restart. The restart is initiated by the POR circuit. After a slight delay, the signal returns to logic “High”, resuming normal operation. The signal is delayed by a combined reset delay time and reset hold time.

The reset hold time is available in two different forms: fixed time and adjustable time. The difference between the two is in the pulse width of the reset signal; in the fixed time setting, the pulse width is determined by an external capacitor, while in the adjustable time setting, it is determined by the BU4343F-TR IC itself.

Furthermore, the BU4343F-TR is designed to detect various reset conditions such as primary power monitor (1V to 20V) and 0.4V reference voltage to insure stable system operation. This IC also has a current consumption of 0.8μA (max.) to reduce power consumption and increase energy efficiency of the product.

In summary, the BU4343F-TR is a superior supervisor IC for managing power supply, power sequencing and system reset functions. It can supply various reset conditions, low voltage operation and fast reset operation and is therefore perfect for advanced industrial equipment and home appliances.

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