BD46261G-TR Integrated Circuits (ICs)

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The BD46261G-TR is a member of the BD46261G/BD46261 series of dual voltage supervisors targeted at system reset applications in various digital consumer and industrial products such as hot swap boards and battery-powered systems. It has two independent power supplies (analog and digital), a voltage-input level detector, an active-low reset output, and adjustable voltage detect (VDET) and reset (RESET) threshold levels.

The BD46261G-TR is designed to provide system reset functions, minimizing the chances of accidental device reset and protecting against system malfunctions. The device contains two supervisory circuits and has two RESET outputs: RESET1 (resuming normal operation) and RESET2 (powering up in case of trouble).

The BD46261G-TR operates in two modes: latch reset and delay reset. In latch reset mode, it automatically reset the system when the power source drops below a predetermined voltage value. In delay reset mode, it keeps the system in reset state until the power source recovers above a predetermined value, and then releases reset after a specific amount of time to allow the system to boot properly.

The BD46261G-TR has high-speed detection, up to 10 mV/µs. In addition, it has a wide operating voltage range, 2.5 V to 16 V, allowing the system to be reset at any voltage in the range. Furthermore, the device is designed with a low current consumption in standby mode and fast operation in active mode. It has a very low quiescent current of 300 nA and a typical active current consumption of 3 mA.

The active-low RESET output of the BD46261G-TR has a maximum sinking current of 10 mA. It\'s also designed with an open-drain reset output, allowing for an easy connection to a pull-up resistor. This makes the device particularly useful for system reset applications in hot-swap boards, where the output can be connected to a low-voltage pull-up resistor aboard the board.

The dual voltage detector in the device allows it to monitor both digital and analog power sources, providing reliability. The detector features two independent adjustable thresholds, VDET and RESET, as well as hysteresis to ensure proper reset operation. The VDET threshold can be adjusted to detect a voltage drop anywhere between 2.5 V and 16 V. The VDET level is used to detect whether the power source is within a safe range and to possibly generate a reset output.

The BD46261G-TR also has a start-up delay control for both VDET and RESET. The start-up delay time is adjustable, allowing for a 30 ms to 3 s delay before the RESET output releases. This helps to prevent false resets when the reset threshold is reached and to ensure that the system has time to boot properly. It also has an adjustable VDET delay time, preventing RESET if the voltage falls below the VDET threshold, but recovers before the VDET delay time expires.

In summary, the BD46261G-TR is an ideal choice for system reset applications. It has two independent adjustable thresholds, with hysteresis to ensure proper function. It is designed with a low current consumption in standby mode and fast operation in active mode. The device also has an open-drain reset output, fast response time, wide operating voltage range, and adjustable delay times, making it highly reliable in various applications.

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