MAX8867EUK40+T

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MAX8867EUK40+T Application Field and Working Principle

The MAX8867EUK40+T is a linear voltage regulator designed for integrated system and battery pack management applications. It guarantees up to 40V input voltage in a fully integrated solution, as well as an efficient solution to provide up to 4.5A output current. A simplified version is available that offers up to 36V input voltage without the need of an external reference, while providing up to 4A output current.

The main application field of this regulator is the integrated management of the system and battery in automotive, portable and industrial applications. Configured for either single or multiple battery systems, this regulator not only offers a high current mode to quickly charge most battery types, but also a dual-voltage-level protection monitoring feature to protect the system as well as the connected device from damage. With respect to the battery protection features, the MAX8867EUK40+T offers an integrated over-voltage, over-temperature and even an over-charged protection.

Overview

At a high level, the MAX8867EUK40+T contains 4 distinct components including a current limit, a voltage protection monitor, and two voltage regulators, one of which is configured to provide a reference voltage (VREF). The current limit consists of two parts; a resistor and a switch. The resistor is used to limit the current flow, while the switch is used to turn off the voltage regulator when the current exceeds a pre-set limit. The voltage protection monitor monitors the voltage at the output to detect and prevent any over-voltage or under-voltage, ensuring that the connected device is not damaged. Finally, the two voltage regulators are configured to provide the input voltage (VIN) and the reference voltage (VREF).

Working Principle

The MAX8867EUK40+T voltage regulator is a forward converter topology, which is a type of switched-mode regulator. In this type of regulator, energy is transferred from the input (VIN) to the output (VOUT) in steps. First, the current limit and voltage protection monitor are used to ensure that the current and voltage are at safe levels. Once the safe level is determined, the switch is then opened and closed in a specific pattern that transfers energy from the input to the output, with the voltage regulator controlling the amount of energy transferred. The voltage regulator is used to maintain the output voltage at the desired level.

The voltage regulator controls the duty cycle of the switch, as well as the switching frequency. The voltage regulator is adjusted by the reference voltage (VREF). When the output voltage exceeds the VREF, the voltage regulator will reduce the duty cycle of the switch, reducing the amount of energy transferred and lowering the output voltage. Conversely, when the output voltage drops below the VREF, the voltage regulator will increase the duty cycle of the switch, increasing the amount of energy transferred and raising the output voltage.

In addition to the voltage regulator, the MAX8867EUK40+T operates with an external resistor, which is used to set the current limit. This current limit protects against excessive current in the system, as well as from over-charging the connected device. Finally, the voltage protection monitor monitors the voltage at the output, detecting and preventing any over-voltage or under-voltage, ensuring that the connected device is not damaged.

Conclusion

The MAX8867EUK40+T is a high performance, integrated voltage regulator designed for integrated system and battery pack management applications. The main application field of this device is the integrated management of the system and battery in automotive, portable and industrial applications. Configured for either single or multiple battery systems, it offers a high current mode to quickly charge most battery types, as well as a dual-voltage-level protection monitoring feature to protect the system as well as the connected device from damage. At its core, the device operates with a forward converter topology, which utilizes a voltage regulator to maintain the output voltage at the desired level, as well as an external resistor to set the current limit.

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