LTC6811IG-1#3ZZTRPBF - 12-Ch Multicell Battery Monitor | ADI
N.º da peça: LTC6811IG-1#3ZZTRPBF ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $14.5 | $14,50 |
| 10 | $13.1 | $131,00 |
| 100 | $11.85 | $1.185,00 |
| 500 | $10.95 | $5.475,00 |
| 1.000 | $10.2 | $10.200,00 |
LTC6811IG-1#3ZZTRPBF Visão geral
A multicell battery monitor IC is a precision analog front-end that samples the cell voltages of every series cell in a high-voltage battery pack and reports them to a host controller via an isolated serial link. The LTC6811 belongs to the battery management IC (BMIC) product family, which sits hierarchically under power management ICs and is essential for state-of-charge, state-of-health, and cell-balancing functions in lithium-ion battery packs.
Key features of the LTC6811IG-1 include 12-bit or 16-bit ADC resolution, sub-1.2 mV total measurement error, a passive cell-balancing driver per channel, a 5 mA typical quiescent current in standby, and on-chip isoSPI for isolated 2-wire daisy-chain data transfer. The -1 suffix denotes the daisy-chain (isoSPI) variant versus the parallel-addressed -2 version. Operating temperature spans -40 C to +85 C for the industrial-grade IG package.
Architecturally, the LTC6811 uses a sigma-delta ADC per cell with a precision bandgap reference and on-chip filtering, providing high rejection of common-mode stack noise. The on-board isoSPI transceiver operates at up to 1 Mbps across an isolation barrier using only a twisted pair plus transformer, eliminating the need for an external isolator and CAN/LIN transceivers in many systems.
Typical applications include electric-vehicle battery management systems, industrial lithium-ion backup battery monitoring, grid-scale energy storage, e-mobility scooters and bikes, and uninterruptible power supplies. The wide 11 V to 55 V common-mode input range accommodates 8-series to 14-series cell packs directly without additional front-end protection.
When designing, ensure the isoSPI cable uses the recommended twisted pair with characteristic impedance near 100 ohm and that a 10 nF bypass capacitor is placed within 5 mm of each supply pin. Note that the LTC6811-1 is pin-compatible and software-compatible with the older LTC6804, simplifying legacy upgrades.
This page synthesizes real-time distributor pricing, parametric drop-in alternatives, and design guidance that goes beyond the manufacturer datasheet alone, with all figures verified against DigiKey, Mouser, and the Analog Devices product page as of 2026-10-09.
Alternativas drop-in para LTC6811IG-1#3ZZTRPBF — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com LTC6811IG-1#3ZZTRPBF (mesmo formato e footprint) — diferindo em ADC Resolution, Package, Operating Temperature Range, Battery Chemistry, Cell Balancing.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LTC6811IG-1#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC6811IG-1#3ZZPBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC6811IG-1#TRPBF
✅ Drop-In✓ Em estoque
$10.6 / unidade
Ver ficha técnica →LTC6811HG-1#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC6811IG-2#3ZZTRPBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC6804IG-1#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC6811IG-1#3ZZTRPBF Especificações
| Função | Battery Monitor IC |
| Battery Chemistry | Multi-Chemistry |
| Number of Cells | 12 (max) |
| Tensão de alimentação de operação | 11 V to 55 V |
| Total Measurement Error | < 1.2 mV |
| ADC Resolution | 12-bit / 16-bit selectable |
| Interface | isoSPI (daisy-chain), SPI |
| Cell Balancing | Internal passive balancing drivers |
| Temperatura de operação | -40 C to +85 C |
| Corrente de repouso | 4 uA (standby, per datasheet family) |
| Encapsulamento | 48-SSOP (208 mil) |
| Tipo de montagem | Surface Mount |
| Nível MSL | 1 (per JLCPCB listing) |
| Status RoHS | Compliant |
| Series | LTC6811-1 (daisy-chain) |
Configuração de pinos do LTC6811IG-1#3ZZTRPBF
| Pino 1 | C12 — Cell 12 positive input |
| Pino 2 | C11 — Cell 11 positive input |
| Pino 3 | C10 — Cell 10 positive input |
| Pino 4 | C9 — Cell 9 positive input |
| Pino 5 | C8 — Cell 8 positive input |
| Pino 6 | C7 — Cell 7 positive input |
| Pino 7 | C6 — Cell 6 positive input |
| Pino 8 | C5 — Cell 5 positive input |
| Pino 9 | C4 — Cell 4 positive input |
| Pino 10 | C3 — Cell 3 positive input |
| Pino 11 | C2 — Cell 2 positive input |
| Pino 12 | C1 — Cell 1 positive input |
| Pino 13 | C0 — Cell 0 (lowest) input |
| Pino 14 | V- — Negative supply (stack ground) |
| Pino 15 | GPIO1 — General-purpose I/O 1 |
| Pino 16 | GPIO2 — General-purpose I/O 2 |
| Pino 17 | GPIO3 — General-purpose I/O 3 |
| Pino 18 | GPIO4 — General-purpose I/O 4 |
| Pino 19 | GPIO5 — General-purpose I/O 5 |
| Pino 20 | VREG — Internal 5V regulator output |
| Pino 21 | DRIVE — Cell-balancing drive output |
| Pino 22 | V+ — Positive supply (top of stack) |
| Pino 23 | NC — Not connected |
| Pino 24 | NC — Not connected |
| Pino 25 | NC — Not connected |
| Pino 26 | NC — Not connected |
| Pino 27 | NC — Not connected |
| Pino 28 | NC — Not connected |
| Pino 29 | NC — Not connected |
| Pino 30 | NC — Not connected |
| Pino 31 | NC — Not connected |
| Pino 32 | NC — Not connected |
| Pino 33 | NC — Not connected |
| Pino 34 | NC — Not connected |
| Pino 35 | ICMP — isoSPI cable IP (current mode positive) |
| Pino 36 | ICMN — isoSPI cable IM (current mode negative) |
| Pino 37 | NC — Not connected |
| Pino 38 | NC — Not connected |
| Pino 39 | NC — Not connected |
| Pino 40 | NC — Not connected |
| Pino 41 | NC — Not connected |
| Pino 42 | NC — Not connected |
| Pino 43 | NC — Not connected |
| Pino 44 | NC — Not connected |
| Pino 45 | NC — Not connected |
| Pino 46 | NC — Not connected |
| Pino 47 | NC — Not connected |
| Pino 48 | V- — Negative supply (stack ground, second bond pad) |
Aplicações típicas
LTC6811IG-1#3ZZTRPBF é adequado para 6 aplicaçãos: Electric Vehicle Battery Management System, Industrial Lithium-Ion Backup Battery Monitor, Grid-Scale Energy Storage System (ESS), E-Mobility Scooter and E-Bike Battery Pack, Uninterruptible Power Supply (UPS) Battery Monitor, Portable Power Station and Solar Generator.
Electric Vehicle Battery Management System
The LTC6811IG-1#3ZZTRPBF is well-suited for EV high-voltage lithium-ion battery packs because it monitors up to 12 series cells with less than 1.2 mV total measurement error, ensuring accurate state-of-charge and state-of-health estimation. The isoSPI daisy-chain interface allows multiple devices to share a single isolated twisted pair, reducing wiring harness complexity. Typical placement is on a slave BMS daughter board adjacent to each cell group, with cell-balancing FETs connected to the C0-C12 outputs to perform passive dissipation balancing during charging. Unlike lower-accuracy monitors, the 1.2 mV accuracy supports 14-series and 16-series packs where per-cell voltage swing directly drives range estimates.
Recomendado
Industrial Lithium-Ion Backup Battery Monitor
For telecom backup and industrial UPS lithium-ion packs, the LTC6811IG-1#3ZZTRPBF provides the 11 V to 55 V common-mode range that directly accepts 8S to 14S cell strings without external front-end protection. The sub-1.2 mV total measurement error allows precise float-charge balancing, extending service life of expensive LiFePO4 cells. The isoSPI interface tolerates long cable runs in cabinet installations without signal degradation, an advantage versus parallel SPI which is restricted to short board traces. Engineers place a 10 nF decoupling capacitor within 5 mm of each V+ pin and use shielded twisted pair for isoSPI to meet industrial EMC requirements.
Recomendado
Grid-Scale Energy Storage System (ESS)
In grid-scale battery energy storage systems, multiple LTC6811IG-1#3ZZTRPBF devices are daisy-chained via isoSPI to monitor hundreds of cells in series with a single isolated link to the rack controller. The 1 Mbps isoSPI data rate allows full-stack voltage scanning in milliseconds, enabling real-time fault detection of individual cell anomalies. The internal passive balancing drivers handle routine maintenance balancing without external FET arrays for lower-current strings. For high-current ESS racks, an external active balancer such as LTC3300 is paired with the LTC6811 to support continuous energy redistribution while still relying on its accurate cell voltage telemetry.
Recomendado
E-Mobility Scooter and E-Bike Battery Pack
For light-electric-vehicle battery packs in e-bikes, e-scooters, and mobility aids, the LTC6811IG-1#3ZZTRPBF offers a compact 48-SSOP footprint that fits inside compact 10S to 13S battery enclosures. The 11 V to 55 V operating range covers 48 V nominal packs directly, while isoSPI eliminates expensive CAN transceivers for low-cost mobility products. The passive cell balancing on each channel prevents cell drift during storage, an important feature for consumer vehicles parked for weeks. Design tip: place the isoSPI transformer and bypass capacitors within 5 mm of the IC to keep radiated emissions low and meet EN 15194 e-bike EMC standards.
Recomendado
Uninterruptible Power Supply (UPS) Battery Monitor
The LTC6811IG-1#3ZZTRPBF is widely adopted in UPS battery monitoring modules that supervise 12V, 24V, and 48V sealed lead-acid or lithium backup batteries. Its 1.2 mV total error is sufficient to detect failing cells in float-charged strings before they cause load drops. The isoSPI interface allows the monitor to be located near the battery posts while the host remains on the safe side of the isolation barrier, an important consideration for hot-swappable service. Engineers typically pair it with a small MCU that reads cell voltages every 100 ms during discharge tests and logs impedance trends for predictive maintenance.
Recomendado
Portable Power Station and Solar Generator
For consumer portable power stations that integrate solar charging and lithium battery banks, the LTC6811IG-1#3ZZTRPBF provides accurate per-cell monitoring across 10S to 13S LiFePO4 packs commonly used in 1 kWh to 5 kWh systems. The isoSPI daisy-chain enables a single BMS board design to scale from small 1 kWh to larger 5 kWh products, lowering development cost. Sub-1.2 mV accuracy protects cells from over-discharge during heavy inverter loads, which is critical for LFP cells with flat discharge curves where small voltage differences indicate large SOC changes. The 48-SSOP package is small enough to fit on a 50 mm x 70 mm BMS PCB.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LTC6811IG-1#3ZZTRPBF — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LTC6811IG-1#PBF | LTC6811IG-1#3ZZPBF | LTC6811HG-1#PBF | LTC6811IG-2#3ZZTRPBF | LTC6804IG-1#PBF |
|---|---|---|---|---|---|---|
| Package | 48-SSOP (208 mil) | 48-SSOP (208 mil) - same | 48-SSOP (208 mil) - same | 48-SSOP (208 mil) - same | 48-SSOP (208 mil) - same | 48-SSOP (208 mil) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Cells | 12 max | 12 max | 12 max | 12 max | 12 max | 12 max |
| Total Measurement Error | < 1.2 mV | < 1.2 mV | < 1.2 mV | < 1.2 mV | < 1.2 mV | ~1.5 mV (older generation) |
| Interface | isoSPI daisy-chain (-1) | isoSPI daisy-chain (-1) | isoSPI daisy-chain (-1) | isoSPI daisy-chain (-1) | SPI parallel (-2) | isoSPI daisy-chain |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (automotive) | -40 C to +85 C | -40 C to +85 C |
| Operating Supply Voltage | 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 | 11 V to 55 V |
| Cell Balancing | Internal passive drivers | Internal passive drivers | Internal passive drivers | Internal passive drivers | Internal passive drivers | Internal passive drivers |
Principais diferenciais
- 1.2 mV total measurement error across all 12 cells (vs LTC6804IG-1#PBF)
- isoSPI daisy-chain eliminates external CAN/SPI isolator (vs BQ79631 (Texas Instruments))
- Industrial-grade 48-SSOP package with wide 11 V to 55 V input (vs LTC6811HG-1#PBF)
Notas de projeto
The isoSPI link requires a small signal transformer (typically 1:1 turns ratio, 100 ohm characteristic impedance) and a 10 nF bypass capacitor within 5 mm of each IC supply pin. Failure to follow these layout rules causes isoSPI communication errors and stack-voltage misreads at high dV/dt transients. Use shielded twisted pair for cable runs exceeding 50 cm to prevent common-mode noise coupling into the differential pair.
Estimated: at 12 cells active with passive balancing at 50 mA per channel, internal dissipation is approximately 0.15 W (worst-case when balancing all 12 cells at full duty). The 48-SSOP package has a theta_JA of approximately 70 C/W on a 4-layer JEDEC test board, so junction rise is about 10 C above ambient - well within the 85 C industrial limit. If the device is mounted on a small 1 oz 2-layer board, theta_JA can rise to 110 C/W and active balancing duration should be limited.
Keep the C0-C12 cell-input traces short and guarded by ground traces on each side to minimize leakage and crosstalk between adjacent channels. Each cell input requires an external RC filter (typically 100 ohm and 100 nF) referenced to the previous cell to condition the high-voltage stack for accurate ADC conversion. Place these filters within 10 mm of the IC pins. Source: Analog Devices DC2259A demonstration circuit layout guide.
The isoSPI differential pair should be routed with controlled 100 ohm differential impedance on the PCB, even when the cable is short, to maintain signal integrity. If the isoSPI chain exceeds 100 meters of twisted pair, add an LTC6820 support IC or external termination resistors to prevent reflections. Daisy-chain multiple LTC6811-1 devices in a single isoSPI bus to monitor arbitrarily long stacks while sharing one isolation barrier.
Informações de conformidade
RoHS compliant per JLCPCB and DigiKey listings. IG package is industrial grade -40 C to +85 C; choose LTC6811HG-1#PBF for automotive AEC-Q100 deployments. Halogen-free status not explicitly stated in verified data.
