Linear Technology Corporation introduced the second generation of high-voltage battery monitor LTC6803, the device for hybrid / electric vehicle (HEV), electric vehicle (EV) and other high-pressure, high-performance battery systems. LTC6803 is a complete battery measurement IC, includes a 12-bit ADC, a precision voltage reference, a high-voltage input multiplexer and a serial interface. Each LTC6803 can measure up to 12 independent battery cells connected in series. The device’s proprietary design allows multiple LTC6803 can be stacked in series without optocouplers or isolators, allowing for long strings of each joint connecting the battery cell in the precise voltage monitoring. LTC6803 following the September 2008 market introduction of new products after the LTC6802, LTC6802 has proved to be a good development path, while the LTC6803 and its function and leads to the same pin configuration, and achieved a lot in terms of performance improvement.
At -40 ° C to 125 ° C temperature range, LTC6803 guarantees the maximum total measurement error less than 0.25%. LTC6803 provides from-300mV to 5V measuring range extended battery, which can monitor the chemical composition of a wide variety of battery and super capacitor. Conducted for each battery undervoltage and overvoltage monitoring the situation, an associated MOSFET can be used to over-charging the battery to discharge. A built-in 5V regulator, temperature sensors, GPIO lines and thermistor input provides more functionality.
Linear Technology’s Signal Conditioning Products Erik Soule, Vice President, said: “Until now, we have the reputation of excellence with the battery pack into the field more than the monitor series two years, we are pleased to offer this to customers enhanced products LTC6803 . global automotive manufacturers and other customers have embraced the company’s solid Linear battery monitor, and we believe this new member of the family of the next generation of HEV and EV will provide excellent performance. ”
Linear Technology Design Manager Mike Kultgen, said: “LTC6803 to meet the precise needs of the latest high-performance batteries. In the harsh automotive environment, it can ensure accurate, safe, reliable and error-free work.”
To long-term storage of the battery pack, the integrated battery management system (BMS) current consumption capacity of the battery pack may be out of balance. LTC6803 to standby mode to eliminate the concern, the model only consumes less than 12uA. In addition, LTC6803’s power supply input and battery pack is isolated, which allows the device to draw current from a separate power supply. When this input power supply, the current drawn from the battery to less than 1uA.
LTC6803 design beyond the automotive and industrial applications on the environment, reliability and security requirements. The device’s technical specifications for the -40 ° C to 125 ° C operating temperature range of fully worked out. It is designed to comply with ISO26262 (ASIL) standard system is designed, and that a complete self-test failure can be delayed to ensure that the situation does not occur. In compliance with the standards, LTC6803 integrates a redundant voltage reference, a rich logic test circuit, open wire detection capabilities, and a watchdog timer, in order to achieve fail-safe design. LTC6803 to withstand up to 75V for the voltage and design, which contains 12 batteries for a full battery strings for more than 20% of the over-voltage margin. 1MHz serial interface with packet error checking functions, and for a lot of noise and transients in the presence of an environment designed to operate.
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