LTC6811IG-2#3ZZTRPBF

Overview

The LTC6811IG-2#3ZZTRPBF is a 12-channel multicell battery stack monitor manufactured by Analog Devices Inc. It measures up to 12 series-connected cells with a maximum total measurement error of 1.2mV and a cell voltage range of 0V to 5V. The device features an addressable isoSPI interface for communication, allowing multiple units to be connected in parallel with individual addressing rather than daisy-chaining. It operates on a supply voltage ranging from 11V to 55V and is housed in a 48-pin SSOP package.

Feature Summary

• Supports parallel connection of multiple devices via individually addressable isoSPI interface
• Measures up to 12 series-connected battery cells simultaneously
• Includes passive cell balancing with programmable timing control
• Features integrated 5V regulator and five general-purpose I/O lines

Applications

• Electric vehicle and hybrid electric vehicle battery management systems
• Stationary energy storage systems
• Backup power supply batteries
• High-power portable equipment

Procurement Notes

Verify the specific suffix #3ZZTRPBF against official Analog Devices documentation to confirm tape-and-reel packaging and RoHS compliance status. Ensure the order matches the -2 variant which supports addressable isoSPI topology, distinct from the -1 daisy-chain version. Confirm the 48-pin SSOP package type aligns with your PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component when a system requires monitoring more than 12 cells using a parallel addressing scheme rather than a daisy-chain topology. The addressable isoSPI interface simplifies wiring complexity for large stacks compared to serial cascading. Verify that the operating environment falls within the specified temperature range and that the 11V to 55V supply voltage is compatible with the host system design.

Part Context

This part belongs to the LTC681x family of battery monitors designed for high-voltage series cell applications. It serves as a direct upgrade path from legacy components like the LTC6804, offering improved accuracy and integrated isolation. The -2 suffix specifically denotes the addressable isoSPI capability, differentiating it from the standard daisy-chain LTC6811-1.

Replacement Considerations

LTC6811IG-1#3ZZTRPBF offers identical measurement capabilities but utilizes a daisy-chain isoSPI interface instead of addressable parallel connections. System architecture must be adjusted if switching between these variants due to the fundamental difference in communication topology.