AG933-07E

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The AG933-07E is a voltage monitor IC intended for use in monitoring circuits in electronic circuits. The device is a voltage monitor dedicated to lithium-ion battery protection, and it can detect an overvoltage, an undervoltage, and an overcurrent based on a voltage signal from a battery, which is sent through an external amplifier circuit.

The AG933-07E is designed for the protection of lithium-ion batteries in automotive, industrial and consumer electronic applications. It calibrates accurately, with a fast response to a wide range of battery voltage levels. The Ag933-07E can replace traditional discrete solution designs, which typically require more components and can be more expensive and difficult to maintain and debug.

The AG933-07E performs three protection modes:

• Undervoltage Monitoring: The device monitors the battery’s terminal voltage and when the voltage drops below a preset threshold (UV), the AG933-07E will detect the undervoltage condition and output an interrupt or shut down signal.
• Overvoltage Monitoring: The device monitors the battery’s terminal voltage and if the voltage exceeds a preset threshold (OV), the AG933-07E will detect an overvoltage condition and output an interrupt or shut down signal.
• Overcurrent Detection: The AG933-07E has an internal current sensor to detect if the current drawn from the battery exceeds a preset threshold (OC). If the current goes beyond the preset threshold, the AG933-07E will detect an overcurrent condition and output an interrupt or shut down signal.

The AG933-07E is designed to be connected in series with the battery. It has two external influences, the battery voltage and the input current, both of which are measured by the internal sensors. The measured information is compared to the programmed thresholds and the operation of the device is determined by the comparison result. The output signal will be generated for either an overvoltage, undervoltage, or overcurrent event, and the device will send a signal to the system to shut down or generate an interrupt. The AG933-07E has a low quiescent current (25 to 50mA) which makes it suitable for all types of applications where current consumption needs to be kept to a minimum.

Because the AG933-07E is designed to directly measure the battery voltage and current on board, it eliminates the need for external voltage and current sensing components. This reduces the cost and complexity of the circuit.

The AG933-07E also features a total current sense accuracy of 1%, which is critical in many lithium-ion applications, and a low voltage detection accuracy of 1.5%. The AG933-07E also features a reset warning indication, which will alert the user when the device is about to reset itself.

Overall, the AG933-07E is an ideal solution for applications that require protection against overvoltage, undervoltage and overcurrent conditions, such as vehicle power supplies, industrial batteries and a variety of consumer electronics. The device’s wide range of features (low quiescent current, internal sensing, and accurate sensing accuracy) make it an attractive solution for a number of applications requiring protection from overvoltage, undervoltage and overcurrent.

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