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LTC6803-1 and -3 - Multicell Battery Stack Monitor

The LTC6803 is a 2nd generation, complete battery monitoring IC that 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 series-connected battery cells or supercapacitors. Using a unique level shifting serial interface, multiple LTC6803-1/ LTC6803-3 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. The LTC6803-1 connects the bottom of the stack to V– internally. It is pin compatible with the LTC6802‑1, providing a drop-in upgrade. The LTC6803-3 separates the bottom of the stack from V–, improving cell 1 measurement accuracy.

The LTC6803 provides a standby mode to reduce supply current to 12μA. Furthermore, the LTC6803 can be powered from an isolated supply, providing a technique to reduce battery stack current draw to zero.

For applications requiring individually addressable serial communications, see the LTC6803-2/LTC6803-4.

Features Measures Up to 12 Battery Cells in Series Stackable Architecture Supports Multiple Battery Chemistries and Supercapacitors 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 Passive Cell Balancing: – Integrated Cell Balancing MOSFETs – Ability to Drive External Balancing MOSFETs Onboard Temperature Sensor and Thermistor Inputs 1MHz Serial Interface with Packet Error Checking Safe with Random Connection of Cells Built-In Self Tests Delta-Sigma Converter With Built-In Noise Filter Open-Wire Connection Fault Detection 12μA Standby Mode Supply Current High EMI Immunity 44-Lead SSOP Package Typical Application

Applications Electric and Hybrid Electric Vehicles High Power Portable Equipment Backup Battery Systems Electric Bicycles, Motorcycles, Scooters Packaging

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