Battery monitoring IC targets hybrid/electric vehicles

Milpitas, Calif. — Linear Technology has introduced a highly integrated multi-cell battery monitoring IC, the LTC6802, capable of measuring up to 12 individual lithium-ion battery cells. The LTC6802 enables quick and accurate measurements of all cell voltages in a stack, even in the presence of stack voltages over 1000 V, said Linear.

Aimed at hybrid/electric vehicles and battery backup systems, the device's proprietary design allows multiple LTC6802s to be stacked in series without optocouplers or isolators for precision voltage monitoring of every cell in long strings of series-connected batteries. Long battery strings enable high power, rechargeable applications such as electric and hybrid electric vehicles, scooters, motorcycles, golf carts, wheelchairs, boats, forklifts, robotics, portable medical equipment, and uninterruptible power supply (UPS) systems, said Linear.

The maximum total measurement error is guaranteed at less than 0.25% over the operating temperature range of -40°C to 85°C and all cell voltages in a battery stack can be measured within 13 ms. Each cell is monitored for under-voltage and over-voltage conditions, and an associated MOSFET switch is available to discharge overcharged cells. Each LTC6802 communicates via a 1-MHz serial interface, and includes temperature sensor inputs, GPIO lines and a precision voltage reference.

The LTC6802 is designed for environmental and reliability needs of automotive and industrial applications. Housed in a 8 x 12-mm surface-mount package, the LTC6802 also offers diagnostics and fault detection.

Pricing: $9.95 each in quantities of 1,000.
Availability: Samples, demonstration boards and datasheets are available. The LTC6802 will be available in production quantities in the fourth calendar quarter 2008.
Product information: LTC6802

Linear Technology ,

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