LC709202FRD-01-2H

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Power Management ICs (PMICs) are an incredibly useful device for efficiency and optimization in electrical systems. They make it possible for system designers to minimize power consumption, reduce noise and EMI, and increase system reliability. One such device is the LC709202FRD-01-2H, one of the newest members in the family of Battery Management System (BMS) PMICs from Sanyo. This device is a system-on-chip with a built-in boost converter, making it a highly integrated solution for designing automotive battery management systems. It is also a three-channel monitoring IC (for over, under, and temperature monitoring) that provides an additional layer of safety to automotive battery management systems.

The LC709202FRD-01-2H is a System-in-Package (SiP) device that combines an LSI and an I.C. package. Its embedded analog block circuits and built-in linear regulator provide a medium voltage battery supply voltage of 4.0V to 32.7V, helping to ensure a stable voltage output even when the input voltage fluctuates. To ensure safety, the device also has a logic block circuit with a built-in EEPROM that stores and updates safety data, including temperature information. In addition, the device operates from a wide temperature range from -40 to 125 C.

The device is used in a wide range of applications, including automotive, electronic control units (ECU), hybrid system, and more. Its main mode of operation is as a battery protection IC, used to monitor over-voltage/under-voltage, evaporation/low-voltage, over-temperature and reverse battery conditions. It also provides an open-drain output for signals related to battery over-voltage/under-voltage and evaporation/low-voltage.

Its monitoring ability is owed to the two embedded analog block circuits, which control the input and output voltages of a boost converter. These circuits can detect an increase or decrease in the input voltage, ensuring a stable output voltage over a wide range of input voltage fluctuations. The device also has an I2C bus, which allows remote monitoring and control. The I2C bus also provides information about the battery’s status, including charging and discharging data.

The working principle of the LC709202FRD-01-2H is to constantly monitor the input voltage and output voltage of the boost converter. Any changes in the input voltage are compared to the setpoints to determine if the voltage is within the predetermined range. If the voltage is found to be outside of the predetermined range, the device will control an open-drain switch (an output transistor) to switch off the output and protect the battery from over-voltage/under-voltage and evaporation/low-voltage. The device also has a third-party temperature monitoring circuit, which can detect temperature changes in real-time and control the output of the boost converter accordingly.

Aside from being a PMIC for battery protection, the LC709202FRD-01-2H also has a built-in boost converter. The device utilizes a step-up conversion method, which increases the input voltage to a higher voltage that is suitable for driving a load. The maximum input voltage of the boost converter is 5.5V, and it can output voltages from 4V up to 32.7V. The device also provides an output current control pin, which can be used to set an upper limit for the output current of the boost converter.

The overall design and functionality of the LC709202FRD-01-2H provide a high level of reliability and protection to automotive battery management systems. Its integrated Safety Logic monitors the voltage and temperature of the battery, and its boost converter increases the input voltage to a higher output voltage. This allows the device to provide improved efficiency, reduce noise and EMI, and increase reliability in automotive battery systems.

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