LTC6811IG-2#PBF

Product Overview

Category

The LTC6811IG-2#PBF belongs to the category of integrated circuits (ICs) specifically designed for battery management systems (BMS).

Use

This product is primarily used for monitoring and managing the performance of lithium-ion battery packs. It provides accurate measurements of individual cell voltages, temperatures, and other critical parameters.

Characteristics

• High accuracy: The LTC6811IG-2#PBF offers precise voltage measurement with a resolution of up to 16 bits.
• Scalability: It can be easily configured to support battery packs ranging from a few cells to hundreds of cells.
• Robust communication: The IC supports a robust daisy-chain communication protocol, enabling reliable data transfer between multiple LTC6811 devices.
• Fault detection: It incorporates various built-in diagnostic features to detect faults such as overvoltage, undervoltage, and overtemperature conditions.

Package and Quantity

The LTC6811IG-2#PBF is available in a 38-lead plastic TSSOP (Thin Shrink Small Outline Package) package. It is typically sold in reels containing 250 units.

Specifications

• Input Voltage Range: -0.3V to +5V
• Cell Voltage Measurement Range: 0V to 5V
• Temperature Measurement Range: -40°C to +125°C
• Communication Interface: SPI (Serial Peripheral Interface)
• Operating Temperature Range: -40°C to +85°C
• Supply Voltage: 2.7V to 5.5V
• Resolution: Up to 16 bits

Pin Configuration

The LTC6811IG-2#PBF has a total of 38 pins. Here is a detailed pin configuration:

1. VREF-
2. VREF+
3. GPIO1
4. GPIO2
5. GPIO3
6. GPIO4
7. GPIO5
8. GPIO6
9. GPIO7
10. GPIO8
11. GPIO9
12. GPIO10
13. GPIO11
14. GPIO12
15. GPIO13
16. GPIO14
17. GPIO15
18. GPIO16
19. GPIO17
20. GPIO18
21. GPIO19
22. GPIO20
23. GPIO21
24. GPIO22
25. GPIO23
26. GPIO24
27. GPIO25
28. GPIO26
29. GPIO27
30. GPIO28
31. GPIO29
32. GPIO30
33. GPIO31
34. GPIO32
35. GPIO33
36. GPIO34
37. GPIO35
38. VREF+

Functional Features

• Cell voltage measurement: The LTC6811IG-2#PBF can measure the voltage of each individual cell in a battery pack accurately.
• Temperature monitoring: It provides temperature measurements to ensure safe operation and prevent overheating.
• Fault detection and protection: The IC incorporates various diagnostic features to detect abnormal conditions and protect the battery pack from potential hazards.
• Daisy-chain communication: Multiple LTC6811 devices can be connected in a daisy-chain configuration, simplifying the communication setup.
• Configurable balancing: The IC supports cell balancing functionality, allowing for equalization of cell voltages within the battery pack.

Advantages and Disadvantages

Advantages

• High accuracy voltage measurement
• Scalable for different battery pack sizes
• Robust communication protocol
• Comprehensive fault detection capabilities
• Configurable cell balancing

Disadvantages

• Relatively high cost compared to simpler battery management solutions
• Requires expertise in battery management systems for optimal utilization

Working Principles

The LTC6811IG-2#PBF operates by continuously monitoring the voltage and temperature of each cell in a lithium-ion battery pack. It utilizes an internal analog-to-digital converter (ADC) to convert the measured voltages into digital values. These values are then processed and made available through the SPI interface for external monitoring and control.

The IC also incorporates various protection features, such as overvoltage and undervoltage detection, to ensure the safe operation of the battery pack. In addition, it supports cell balancing functionality, which equalizes the voltage levels of individual cells to maximize the overall performance and lifespan of the battery pack.

Application Field Plans

The LTC6811IG-2#PBF is widely used in various applications that require precise monitoring and management of lithium-ion battery packs. Some of the key application fields include:

1. Electric vehicles (EVs) and hybrid electric vehicles (HEVs): The IC ensures the safe and efficient operation of the battery packs used in EVs and HEVs.
2. Renewable energy storage systems: It enables accurate monitoring and control of battery packs used in solar and wind energy storage systems.
3. Portable electronic devices: The IC can be utilized in