RT9819B-15GU3

RT9819B-15GU3 is a low dropout linear regulator (LDO) supervisor with a built-in power-on reset (POR) circuit and interrupt output that is well-suited for 3.3/5V systems. It incorporates an accurate voltage monitor (continuously monitors the output voltage of the regulator) with a delay setting of 10ms to 10s, making it ideal for applications such as microcomputers, digital consumer products, and telecommunications devices. The RT9819B-15GU3 can be used for monitoring the voltage of the LDO regulator, and will issue an interrupt when the voltage drops below a preset threshold. It provides adjustable under voltage lockout (UVLO) detection levels, which can be programmed to switch on and off at specific values, ensuring that the system will stay in a safe operating range.

The RT9819B-15GU3 is a dedicated supervisor IC that includes UVLO, soft-start, POR, and a wide reset output voltage range of ±5%, all integrated into a 5-pin TO-92 package. It can be used to detect lower than normal output voltage conditions, while the adjustable soft-start circuit eliminates output voltage overshoot at power-on. The IC monitors and tracks the system\'s main power supply, shutting it off if it falls outside an acceptable range. The power-on reset (POR) circuit is used to reset the system after the power supply rises to a specific voltage level. The adjustable delay time for reset production, which can range from 10ms to 10s, allows for easy system booting.

The RT9819B-15GU3 is designed to aid in the design and safety of power supplies. It can be used in systems that use LDOs to regulate the supply voltage, as the IC monitors and tracks the voltage, switching off the supply if it falls outside an acceptable range. The interrupt output of the IC issues a signal if the input voltage falls below the preset threshold, which can be used to inform the system to take corrective action, such as calling for an additional PSU, or entering into a low power standby mode.

The working principle of RT9819B-15GU3 is based on the voltage drop across a specific resistor. The internal voltage monitor compares the voltage drop across this resistor against the preset threshold, and issues an interrupt when it drops below the preset threshold. The built-in POR circuitry initializes the system when the voltage on the input pin rises above the preset level. In addition, the adjustable UVLO detection level protects the system from being damaged due to a low input voltage.

RT9819B-15GU3 is mainly used in 3.3V/5V systems and has a wide range of applications including computers, digital consumer electronics, and telecommunications. It is an ideal supervisor IC, providing several important protection and monitoring functions such as accurate voltage monitoring, an adjustable delay for reset production, under voltage lockout (UVLO) detection, and integration into a 5-pin TO-92 package. By providing these features, the RT9819B-15GU3 can be used to safely manage, monitor, and adjust system power supplies.