LM3622M-8.4/NOPB

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Linear Technology Corporation\'s LM3622M-8.4/NOPB is an advanced power management integrated circuit (PMIC) designed to drive six strings of up to eight cells. It is classified under the PMIC – Battery Chargers and is specifically designed for electric vehicle battery charging applications. LM3622M-8.4/NOPB enables a cost-effective and power efficient charger system by providing the required power management features in a single package.

The LM3622M-8.4/NOPB PMIC contains a maximum peak current limit (400mA) and a high-side current sensing device that measures and computes the total current up to 400mA, accurately and with low power dissipation. This regulated peak current limit facilitates simultaneous charging of multiple strings while limiting peak to minimize stress on the power source, especially in settings with high total current demand.

In addition, the device includes built-in protection features such as cell under voltage lockout (UVLO), cell over voltage lockout (VOV) and cell overtemperature lockout (OTP). It also has an intelligent cell balancing circuit designed to improve end-of-charge accuracy, and ensure that full advantage is taken from the available battery capacity.

The basic principle of operation for the LM3622M-8.4/NOPB is to provide accurate charging current and voltage control for each battery string. During normal charging operation, the high-side current sensing device measures the total current from all strings of charging batteries and sends a signal to the peak current regulation logic. The peak current regulation logic then adjusts the voltage on the peak control pin (FC), thus controlling the total current.

Moreover, the LM3622M-8.4/NOPB includes on-chip Charge Gas Guage (CGG) registers and comparators that accurately measure cell voltage and current. This data is then used to compute available cell capacity and the time required to complete the charging process. Additionally, the device includes an integrated temperature sensor that provides protection against overtemperature conditions during charging. This data is then sent to the CGG registers to adjust the charging voltage and current as needed.

The LM3622M-8.4/NOPB functions as a highly efficient and cost effective PMIC for Electric Vehicle (EV) battery charging applications. It combines low power consumption with a peak current limit feature that allows for simultaneous charging of multiple strings of EV batteries. Additionally, the integrated temperature sensors and high-side current sensing device provide protection against overtemperature conditions and accurately measure total current. By combining all of these features into a single package, the LM3622M-8.4/NOPB provides a cost-effective and power efficient charging solution for any EV battery charging application.

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