LTC6813HLWE-1#3ZZPBF

Overview

The LTC6813HLWE-1#3ZZPBF is an 18-cell battery stack monitor featuring a daisy-chain isoSPI interface. It measures up to 18 series-connected cells with a total measurement error of less than 2.2mV and supports a 0V to 5V cell voltage range. The device operates within a supply voltage of 16V to 90V and includes passive balancing with a maximum current of 200mA per cell. It offers a sleep mode current consumption of 6µA, operates from -40°C to +125°C, and utilizes a 64-pin LQFP package.

Feature Summary

• Supports simultaneous monitoring of up to 18 series-connected battery cells
• Features integrated isoSPI interface for high-speed, RF-immune long-distance communication
• Provides passive cell balancing with individually programmable PWM duty cycles
• Includes a built-in 5V regulator and configurable general-purpose I/O lines

Applications

• Electric vehicle and hybrid electric vehicle battery systems
• Backup battery systems
• Grid energy storage applications
• High-power portable devices

Procurement Notes

Verify the specific suffix #3ZZPBF against official Analog Devices documentation to confirm the tape-and-reel packaging configuration and RoHS compliance status. Ensure the part number matches the required automotive AEC-Q100 qualification if intended for such environments. Cross-reference the manufacturer's latest datasheet to validate pinout compatibility and operational temperature ranges before finalizing procurement orders.

Selection Notes

Select this component for applications requiring precise monitoring of large battery stacks where galvanic isolation between nodes is critical. The isoSPI interface reduces wiring complexity compared to traditional SPI implementations in multi-device chains. Consider the 200mA balancing capability for thermal management requirements and verify that the 18-cell capacity aligns with the target system architecture without necessitating additional parallel monitors.

Part Context

This part belongs to the LTC6813 family of multicell battery stack monitors designed for high-voltage applications. It is distinct from lower-channel variants like the LTC6810 or LTC6812 by supporting 18 cells. The device is engineered to meet ISO 26262 functional safety standards and holds AEC-Q100 certification, making it suitable for demanding automotive and industrial power management environments.

Replacement Considerations

Official substitutes within the same family include LTC6813ILWE-1#3ZZPBF and LTC6813HMS-1#PBF. Verify package type (LQFP vs MSOP) and temperature grade specifications when evaluating these alternatives for direct replacement.

FAQ

How does the isoSPI interface ensure communication integrity?

The isoSPI interface allows multiple devices to be connected in a daisy chain using a single twisted pair. It supports bidirectional operation and maintains communication integrity even if a break occurs along the communication path.

What is the maximum balancing current supported by this device?

The LTC6813HLWE-1#3ZZPBF provides passive balancing for each cell with a maximum current of 200mA, controlled via individual PWM duty cycles.