LTC6811IG-1#PBF

Overview

The LTC6811IG-1#PBF is a multi-cell battery stack monitor manufactured by Analog Devices Inc. It features an integrated isoSPI interface for daisy-chaining multiple devices to monitor stacks of arbitrary length. The device measures cell voltages with high precision and operates within a supply voltage range of 11 V to 55 V, delivering an output voltage of 5.7 V. Designed for automotive applications, it functions reliably across temperatures from -40°C to +85°C. The component is housed in a 48-pin SSOP package and draws a typical operating current of 550 uA.

Feature Summary

• Integrates isoSPI isolated serial interface for robust communication without external isolators
• Supports daisy-chain topology to monitor unlimited battery cells via stacked boards
• Provides precise measurement of up to twelve series-connected battery cells
• Includes internal protection mechanisms against short circuits and thermal overload

Applications

• Electric vehicle battery management systems
• Stationary energy storage system monitoring
• Industrial equipment requiring high-reliability battery stacks
• Portable devices with dynamic discharge loads

Procurement Notes

Verify the specific suffix #PBF confirms lead-free compliance and tube packaging. Confirm the IG-1 designation matches the required industrial temperature grade and pinout configuration. Ensure the ordering part number aligns with the exact datasheet revision to avoid functional discrepancies in the isoSPI implementation or register map.

Selection Notes

Select this component when designing systems requiring galvanic isolation between the microcontroller and high-voltage battery stacks. It is suitable for applications demanding high accuracy to detect individual cell imbalances early. Consider the 48-pin SSOP footprint constraints and the need for isoSPI-compatible host controllers during the schematic design phase.

Part Context

This part belongs to the LTC681x family of battery monitors, which are optimized for safety-critical applications. The 'IG' suffix indicates an industrial temperature rating, while the '#PBF' denotes a lead-free finish compliant with RoHS standards. It serves as a core sensing element in complex Battery Management Systems where data integrity under electromagnetic interference is paramount.

Replacement Considerations

LTC6811IG-1#3ZZPBF

FAQ

How does the isoSPI interface improve reliability compared to standard SPI?

The isoSPI interface uses transformer coupling to provide electrical isolation, eliminating ground loops and preventing high-frequency noise from corrupting data transmission.

What is the maximum number of cells this chip can monitor directly?

The LTC6811IG-1#PBF can directly measure the voltage of up to twelve series-connected battery cells.