LTC6803IG-3#PBF

LTC6803-3 is a 2nd generation, complete battery monitoring IC that includes a 12bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface. It can measure up to 12 series-connected battery cells or supercapacitors. Using a unique level shifting serial interface, multiple devices can be connected in series, without opto-couplers or isolators, allowing for monitoring of every cell in a long string of series-connected batteries. Each cell input has an associated MOSFET switch for discharging overcharged cells. This separates the bottom of the stack from V–, improving cell 1 measurement accuracy. It is pin compatible with the LTC6802-1, providing a drop-in upgrade. Furthermore, this can be powered from an isolated supply, providing a technique to reduce battery stack current draw to zero. Typical applications are electric and hybrid electric vehicles, high power portable equipment, backup battery systems, electric bicycles, motorcycles, scooters.

• Measures up to 12 battery cells in series, stackable architecture, high EMI immunity
• Supports multiple battery chemistries and supercapacitors, open-wire connection fault detection
• Serial interface daisy chains to adjacent devices, 0.25% maximum total measurement error
• Engineered for ISO26262 compliant systems, 13ms to measure all cells in a system
• On-board temperature sensor and thermistor inputs, 1MHz serial interface with packet error checking
• Safe with random connection of cells, delta-sigma converter with built-in noise filter
• Measurement resolution is 1.5mV/Bit typ (quantization of the ADC, TA=25°C. V+=43.2V, V–=0V)
• Reference pin voltage range from 3.02 to 3.11V (RLOAD=100K to V–)
• 44-lead plastic SSOP package
• Temperature rating range from -40°C to 85°C

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