BD99A41F-E2

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The BD99A41F-E2 is an integrated protection IC designed to protect lithium-ion/polymer battery charging and discharging circuits by monitoring voltage, current and temperature. This device is an ideal alternative for making the charging and discharging safety of lithium-ion/polymer battery packs and to prevent them from damage or destruction when used in various applications. Moreover, this device supports wide range of cell numbers, voltage and temperature monitoring, and external NTC or PTC temperature sensors.

This device has a wide variety of applications, such as charging and discharging protection of consumer electronics, smart phones, toys, solar energy storage, automotive power system and more. This device can also be used to control switching with a lower power consumption, which helps to save energy and reduce the cost of manufacturing.

BD99A41F-E2 provides five programmable over-voltage protection thresholds, one over-current threshold, and one over-temperature threshold. It employs a switch configuration, which includes CMOS transistors and save power by allowing these transistors to rest.

In terms of working principle, the BD99A41F-E2 uses a comparator and a digital control circuit to detect the corresponding over-voltage, over-current, and over-temperature conditions and control the corresponding transistor. This device is designed with a 600 mV power supply.The over-voltage protection allows users to program five independent thresholds for each of the cell outputs, thus providing users with higher accuracy and safety in different use conditions.

The over-current protection block is a classic source-coupled comparator circuit. It is designed to compare the voltage between current sense resistor and the VREF pin. The current sense resistor can be placed in different places to provide different protection levels.

The over-temperature protection block includes a temperature sensor, NTC or PTC, and a dual-input comparator on the same chip. The user can choose either to place a NTC/PTC external resistor on the TSADJ pin to set temperature threshold, or to adjust the temperature threshold by programming register.

When any of the above conditions is detected, BD99A41F-E2 controls its output transistor which turns off the power supply. Moreover, it disables the over-voltage, over-current and over-temperature protection after a power off, thus avoiding unexpected abnormal operations.

All the main functions of BD99A41F-E2 are protected by a lock bit, reset circuit and over-current protection features, allowing it superior level of protection. The lock bit is used to prevent tampering and unauthorized power on. The reset circuit can automatically reset when the IC is powered on. And the over-current protection feature can limit the current going through the output transistor and offering extra protection.

In conclusion, the BD99A41F-E2 is a highly integrated protection IC designed to protect lithium-ion/polymer battery charging and discharging circuits. It offers wide range of applications, such as charging and discharging protection for consumer electronics, smart phones, toys, solar energy storage, and automotive power systems. It executes five programmable over-voltage protection thresholds, one over-current threshold, one over-temperature threshold, reset circuit and lock bit to further protect the system from tampering or unauthorized power on.

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