LTC6811IG-1#TRPBF - 12-Cell Battery Monitor | Analog Devices
MPN： LTC6811IG-1#TRPBF ✓ 啟用中LTC6811IG-1#TRPBF 概覽
A multicell battery monitor is a specialized analog/mixed-signal IC used in Battery Management Systems (BMS) for high-voltage lithium-ion battery stacks. It sits between individual battery cells and the host microcontroller, providing per-cell voltage, temperature, and diagnostics. Within the broader product taxonomy, the LTC6811IG-1 is a battery monitor IC, a sub-category of battery management, which in turn belongs to power management ICs and finally the integrated circuit family. The "Generation 4" designation refers to Analog Devices' fourth-generation cell monitoring architecture, providing improved noise immunity and timing margins over earlier generations.
Key features include a 1.2 mV maximum total measurement error across the full -40°C to +125°C operating range, 290 µs ADC conversion time for all 12 cells, an isoSPI or SPI-compatible isolated daisy-chain interface, on-board passive cell balancing, and built-in self-test diagnostics. The 48-SSOP package enables compact BMS layouts while the daisy-chain architecture allows multiple LTC6811-1 devices to be stacked for systems up to hundreds of cells using only one host processor connection.
The LTC6811IG-1 uses a precision 16-bit sigma-delta ADC per cell with a programmable noise filter and a dedicated bandgap reference. It can be powered directly from the stack it monitors (11 V to 55 V) or from an isolated supply, eliminating external power conversion. The daisy-chain interface uses a differential, capacitively or transformatively isolated link that supports cable lengths up to 100 m.
Typical applications include electric vehicle battery packs, grid-scale energy storage systems, uninterruptible power supplies (UPS), telecom backup battery banks, industrial forklift and e-mobility battery packs, and renewable energy storage systems. The wide input range and high-accuracy measurements make it particularly well-suited for Li-ion, LiFePO4, and lead-acid chemistries in series-stacked configurations.
When designing with this device, allocate PCB area for the isoSPI transformer or capacitor isolation barrier, provide sufficient decoupling at the V+ and V- pins, and follow Analog Devices' reference layout guidelines for thermal management of the SSOP exposed pad. Daisy-chain timing budgets must account for cumulative propagation delay when stacking more than four devices.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on any single distributor product page, including cross-brand equivalents and a side-by-side comparison of same-package BMS monitor alternatives.
直接替換替代品，適用於 LTC6811IG-1#TRPBF — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LTC6811IG-1#TRPBF （相同外形與佔位） — 差異在於 ADC Resolution, Cell Balancing, Function, Interface, MSL Level.
LTC6811HG-1#TRPBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC6811IG-1#3ZZTRPBF
✅ 直接替換聯絡詢價
查看資料表 →LTC6811IG-1#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC6813IG-1#TRPBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC6811IG-1#TRPBF 規格
| 功能 | Battery Monitor IC (Multi-Chemistry) |
| Number of Cells Monitored | 12 series-connected cells |
| Total Measurement Error | < 1.2 mV |
| Supply Voltage Range | 11 V to 55 V |
| 介面 | isoSPI / SPI daisy chain (Generation 4) |
| ADC Resolution | 16-bit |
| ADC Conversion Time (12 cells) | 290 µs |
| 工作溫度範圍 | -40°C to +85°C (industrial grade) |
| Junction Temperature Range | -40°C to +125°C |
| Cell Balancing | Integrated passive balancing drivers |
| 封裝 | 48-SSOP (208 mil) |
| 安裝類型 | Surface Mount |
| MSL 等級 | 1 (Unlimited) |
| RoHS 狀態 | Compliant |
| Series | LTC6811-1 (Daisy-Chain variant) |
LTC6811IG-1#TRPBF 48-ssop (208 mil) 腳位配置指南
LTC6811IG-1#TRPBF（48-ssop (208 mil) 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： LTC6811IG-1#TRPBF.
請參閱 資料表 以查看完整腳位配置。
典型應用
LTC6811IG-1#TRPBF 適用於 6 應用s: Electric Vehicle Battery Packs, Grid-Scale Energy Storage Systems (BESS), Telecom Backup Battery Banks, Industrial UPS and Forklift Battery Packs, Renewable Energy Storage (Solar + Battery Hybrid Inverters), E-Mobility (E-Bikes, Scooters, Light EVs).
Electric Vehicle Battery Packs
The LTC6811IG-1 measures individual cell voltages in 400 V and 800 V EV traction battery packs with less than 1.2 mV error, enabling accurate state-of-charge and state-of-health estimation. Its 11 V to 55 V input range covers 12-cell LiFePO4 and 13-cell NMC modules used in modern EVs, while the Generation 4 isoSPI daisy chain allows up to 16 devices to be stacked with a single isolated link to the vehicle BMS controller. The integrated passive balancing drivers discharge weak cells during charging, supporting pack equalization without external MOSFETs.
推薦
Grid-Scale Energy Storage Systems (BESS)
In grid-scale battery energy storage systems, the LTC6811IG-1 monitors multi-MWh Li-ion racks that can exceed 1000 V total stack voltage. The daisy-chain architecture allows dozens of devices to be connected over long isolation barriers - the isoSPI link supports cable runs up to 100 m with capacitive or transformer isolation, eliminating the need for hundreds of analog signal wires. The 1.2 mV accuracy supports the precise SOC tracking required for grid services like frequency regulation and peak shaving.
推薦
Telecom Backup Battery Banks
Telecom sites use 48 V nominal lead-acid or Li-ion battery banks as backup power for base stations, and the LTC6811IG-1 fits these stacks perfectly with its 11 V to 55 V supply range covering 12-cell or 13-cell configurations. The integrated cell balancing prevents capacity drift in strings of batteries that float at high voltage for years, extending service intervals. Remote monitoring sites benefit from the isoSPI interface, which allows the BMS to be electrically isolated from the rest of the telecom equipment for safety and surge protection.
推薦
Industrial UPS and Forklift Battery Packs
Uninterruptible power supplies and electric forklifts use 24 V to 80 V battery stacks that the LTC6811IG-1 can monitor directly. The 290 µs 12-cell conversion time allows real-time load sharing between parallel battery strings, while the integrated diagnostic functions detect open wires, shorted cells, and overtemperature conditions. Industrial environments benefit from the -40°C to +85°C operating range and the robust 48-SSOP package that withstands vibration in forklift and AGV applications.
推薦
Renewable Energy Storage (Solar + Battery Hybrid Inverters)
Residential and commercial hybrid inverters pair photovoltaic panels with Li-ion battery banks, typically at 48 V nominal. The LTC6811IG-1 monitors the battery side with 1.2 mV accuracy, providing the data needed for maximum power point tracking of the battery and for safe DC bus regulation. Its ability to be powered directly from the stack eliminates the standby power consumption of an auxiliary supply, a key requirement for off-grid solar installations where every milliwatt counts.
推薦
E-Mobility (E-Bikes, Scooters, Light EVs)
Light electric vehicles typically use 36 V or 48 V battery packs, well within the LTC6811IG-1's 11 V to 55 V supply range. The compact 48-SSOP package fits inside the battery housing alongside the cells, while the isoSPI interface allows a single cable to connect the battery to the motor controller for state-of-charge display. Integrated passive balancing extends cell life in packs that are routinely deeply discharged, reducing warranty costs for e-mobility OEMs.
推薦
推薦產品摘要
工程參考資料，適用於 LTC6811IG-1#TRPBF — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LTC6811HG-1#TRPBF | LTC6811IG-1#3ZZTRPBF | LTC6811IG-1#PBF | LTC6813IG-1#TRPBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 48-SSOP | 48-SSOP - same | 48-SSOP - same | 48-SSOP - same | 48-SSOP - same |
| Number of Cells | 12 | 12 | 12 | 12 | 12 |
| Supply Voltage Range | 11 V to 55 V | 11 V to 55 V | 11 V to 55 V | 11 V to 55 V | 11 V to 55 V |
| Interface Generation | Generation 4 isoSPI | Generation 4 isoSPI | Generation 4 isoSPI | Generation 4 isoSPI | Generation 5 isoSPI |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
| Packaging | Tape & Reel (TRPBF) | Tape & Reel | Tape & Reel (alternate trace code) | Tube | Tape & Reel |
主要差異化特點
- Industry-leading <1.2 mV measurement error across full temperature range (對比BQ79616-Q1 (TI))
- Generation 4 daisy-chain supports virtually unlimited device stacking (對比LTC6811-2 (parallel variant))
- Direct stack-powered operation without auxiliary supply (對比Discrete BMS solutions using ADCs + MCU)
設計說明
Place 100 nF ceramic decoupling capacitors as close as possible to the V+ and V- supply pins of the LTC6811IG-1, and add a 10 µF bulk capacitor on the VREG output. The isoSPI differential pair (ICMP/IDI) must be routed as a 100 Ω differential microstrip or stripline with matched lengths to within 1 mm to avoid duty-cycle distortion. Keep digital SPI traces away from cell-input traces to prevent crosstalk into the 1.2 mV-accurate ADC.
Do not exceed the 75 V absolute maximum rating on any cell input pin (C0-C12), even during transient events - add external TVS diodes or RC filters if the battery pack can experience load-dump surges. The daisy-chain timing budget must be recalculated when stacking more than 4 devices, as cumulative propagation delay can cause host timeouts. According to the Analog Devices datasheet, all unused cell inputs must be shorted together to V- rather than left floating.
The exposed pad on the 48-SSOP must be soldered to a thermal copper pour of at least 1 square inch to keep junction temperature below 125°C under worst-case balancing dissipation. For transformer-isolated isoSPI links, place the pulse transformer within 10 mm of the LTC6811IG-1 ICMP/IDI pins and route the differential pair symmetrically through the transformer center tap. Reference the Analog Devices DC2259 demo board layout for an EMC-compliant implementation.
The isoSPI interface is sensitive to common-mode noise; use a center-tapped pulse transformer (such as the HCPL-0810 or similar) with a 1:1 turns ratio and connect the center tap to a stable 5 V rail. The daisy-chain cable should be a twisted pair with characteristic impedance of 100 Ω, terminated with 50 Ω resistors at each end of the differential pair if cable lengths exceed 1 m. Avoid routing the isoSPI cable parallel to high-current battery cables to minimize capacitive coupling.
合規資訊
RoHS compliant per Analog Devices product page. The part carries the #PBF suffix indicating lead-free manufacturing. Not AEC-Q100 qualified - this is an industrial-grade part; automotive applications should use the LTC6811IG-1#3ZZPBF automotive variant.
