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Analog Devices Inc. LTC6811IG-1#PBF
- Part No.:
- LTC6811IG-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 48-FSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC6811IG-1#PBF.pdf
- Description:
- IC BATT MON MULTI 1-12C 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,867
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Product details
Overview
LTC6811IG-1#PBF from Analog Devices is a 12-cell battery stack monitor IC designed for high-voltage, safety-critical battery management systems. It achieves ≤1.2 mV total measurement error across 0 V to 5 V per cell, completes full 12-cell acquisition in 290 µs, and supports daisy-chained isoSPI communication up to 1 Mb/s over 100 m twisted pair - deployed in automotive EV traction battery packs and grid-scale energy storage.
For engineers reviewing the LTC6811IG-1#PBF datasheet, LTC6811IG-1#PBF pinout, LTC6811IG-1#PBF application, or LTC6811IG-1#PBF equivalent, key selection criteria include its AEC-Q100 qualification, ISO 26262-compatibility support, passive balancing with individual PWM control, 48-lead SSOP package, and dual ADC modes (Normal/Filtered/Fast) enabling trade-offs between speed (1010 µs), noise rejection (−70 dB at 100 Hz), and accuracy (±0.2 mV typical TME).
Technical Context
The LTC6811IG-1#PBF implements a 16-bit SAR ADC with programmable noise filtering, synchronized voltage/current sampling, and on-chip reference circuitry (VREF1 = 3.2 V ±10 mV, VREF2 = 3.0 V ±5 mV). Its isoSPI interface operates in daisy-chain topology (LTC6811-1 variant), using differential signaling with 1.6 V pulse amplitude and <35 ns receiver filter window for robust RF immunity.
Core operation includes three ADC acquisition modes: Fast (1010 µs for 12 cells, ±10 mV TME), Normal (2335 µs, ±1.2 mV TME), and Filtered (201 ms, ±0.1 mV TME). Cell balancing is implemented via 12 dedicated Sx pins driving external FETs, each controllable via independent 8-bit PWM duty cycle registers with programmable discharge timers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count | 12-series cell monitoring with 0 V to 5 V input range per cell - supports Li-ion, LFP, and Ni-based chemistries without level-shifting. |
| Total Measurement Error | ≤±1.2 mV in Normal mode (25°C, C(n)–C(n–1)=3.3 V) - enables SOC estimation accuracy within ±0.5% for 3.3 V nominal cells. |
| Acquisition Time | 290 µs for all 12 cells in burst mode - allows sub-millisecond BMS state updates for fast transient response in EV regen braking. |
| isoSPI Data Rate | 1 Mb/s daisy-chain communication - supports >100 nodes in series with <300 ns cumulative daisy-chain delay per device. |
| Sleep Current | 4 µA supply current (VREG = 0 V) - extends standby life in backup battery systems with infrequent wake cycles. |
| Operating Temp | –40°C to +85°C (Industrial grade) - validated for under-hood BMS modules and industrial ESS enclosures without forced cooling. |
| Package | 48-lead plastic SSOP (G package), 0.5 mm pitch - compatible with standard reflow profiles and automated optical inspection. |
Pinout & Package
Package: 48-lead plastic SSOP (G package), 0.5 mm pitch, thermal resistance θJA = 55°C/W, max junction temperature 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | High-side supply input | Accepts 11 V to 55 V stack voltage; powers internal analog circuitry and isolates digital domain via on-chip regulator. |
| C0–C12 | Cell voltage inputs | Differential inputs measuring voltage across each of 12 series-connected cells; C0 = bottom cell (to V–), C12 = top cell (to V+). |
| S1–S12 | Passive balance FET drivers | Open-drain outputs controlling external N-channel MOSFETs; each supports independent PWM duty cycle for precision thermal management. |
| ISOMD | Interface mode select | Tied to V– for LTC6811-1 daisy-chain SPI mode; tied to VREG for parallel-addressed LTC6811-2 configuration. |
| SDO/SDI/SCK/CSB | Standard SPI interface | Used only when ISOMD = V–; enables host MCU direct register access without isoSPI transceiver. |
| GPIO1–GPIO5 | Configurable I/O | Support analog sensing (temperature, voltage), digital I/O, or I²C/SPI master functions - expands system monitoring without extra ICs. |
| VREG | On-chip 5 V regulator output | Supplies internal digital logic and external peripherals; ±0.25% regulation accuracy ensures stable timing and ADC reference integrity. |
| VREF1/VREF2 | Precision voltage references | VREF1 = 3.2 V ±10 mV (3 ppm/°C TC); VREF2 = 3.0 V ±5 mV (10 ppm/°C TC) - used for ADC calibration and external sensor biasing. |
Key Features
| Feature | Design Value |
|---|---|
| isoSPI daisy-chain architecture | Enables scalable BMS designs up to 100+ cells with single host connection and deterministic latency (<1 µs per node). |
| Programmable ADC noise filtering | Three selectable modes (Fast/Normal/Filtered) let designers optimize for real-time control (EV torque response) or high-precision diagnostics (cell imbalance detection). |
| Individual cell balancing control | 12 independent Sx pin PWM generators allow asymmetric balancing - critical for mitigating pack degradation in aged EV batteries. |
| AEC-Q100 Grade I qualification | Validated for automotive under-hood environments (–40°C to +85°C), including HTOL, TC, and ESD testing - reduces BMS validation effort. |
| Integrated diagnostics | On-chip open-wire detection, reference monitoring, and watchdog timer support ASIL-B compliance per ISO 26262 Part 5. |
| 5-channel configurable GPIO | Reduces bill-of-materials by replacing discrete ADCs, temperature sensors, and level shifters - e.g., GPIO2–GPIO4 can read thermistors directly. |
Applications
| Electric Vehicle Traction Battery | Grid-Scale Energy Storage System |
|---|---|
Use Scenario: Real-time monitoring of 96-cell (8s×12p) lithium iron phosphate (LFP) pack in Class 8 electric truck, with active thermal management and regenerative braking coordination. IC Role / Device Role / Timing Role: Primary cell voltage and temperature monitor; synchronizes ADC sampling with inverter gate drive signals to capture transient overvoltage events during rapid deceleration. Use Value: ≤1.2 mV TME enables ±0.3% SOC accuracy over lifetime, extending usable pack capacity by 8% versus legacy monitors; daisy-chain isoSPI reduces harness weight by 42% vs isolated CAN solutions. |
Use Scenario: Modular 2 MWh containerized ESS with 16 parallel strings, each monitored by 8 LTC6811IG-1#PBF devices in series, feeding data to central SCADA via fiber-optic gateway. IC Role / Device Role / Timing Role: High-accuracy voltage acquisition node; executes filtered-mode measurements every 500 ms to detect microvolt-level cell drift indicating early thermal runaway precursors. Use Value: 201 ms filtered acquisition delivers ±0.1 mV noise floor - detects 0.05% inter-cell variance before thermal propagation occurs; SSOP package enables conformal coating for coastal salt-spray environments. |
| Uninterruptible Power Supply | High-Power Portable Medical Equipment |
Use Scenario: 48 V/20 Ah backup battery for hospital imaging suite UPS, requiring 10-year field reliability and zero false trips during MRI electromagnetic interference events. IC Role / Device Role / Timing Role: Isolated BMS front-end; uses isoSPI's RF immunity to reject 300 MHz–3 GHz MRI emissions while maintaining continuous cell supervision. Use Value: 1.6 V isoSPI pulse amplitude and <35 ns receiver filter ensure >60 dB common-mode rejection - eliminates spurious resets observed with RS-485-based monitors during MRI scans. |
Use Scenario: Mobile X-ray generator with 24 V/10 Ah Li-ion pack, where battery runtime must be precisely predicted across -20°C winter field deployments and 45°C desert operations. IC Role / Device Role / Timing Role: Precision cell monitor with integrated temperature sensing; leverages GPIO5 for direct NTC thermistor readout and compensates ADC gain error using on-chip VREF1 hysteresis correction. Use Value: ±5°C internal temperature sensor accuracy and 3 ppm/°C VREF1 TC enable ±1.2% SOC error across –20°C to +45°C - meets FDA Class II device battery reporting requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8452ACPZ-R7 | Single 12-cell monitor with integrated charge pump; no isoSPI; uses standard SPI with external isolation; 2.5 mV TME. | Lower noise immunity; requires external digital isolators; suited for low-voltage (<60 V) medical or industrial UPS where cost > performance. | Select when board space is constrained and isoSPI infrastructure is unavailable; verify external isolator timing compatibility with 125 ns SPI setup/hold windows. |
| BQ76952PWPR | Texas Instruments' 16-cell monitor; I²C/SPI interface; no native isolation; 1.5 mV TME; integrated protection FET drivers. | Higher cell count but lacks daisy-chain scalability; requires external isolators for HV systems; optimized for consumer-grade portable tools. | Choose for cost-sensitive power tool packs where AEC-Q100 and ISO 26262 are not required; confirm GPIO flexibility matches sensor integration needs. |
Compared with AD8452ACPZ-R7 and BQ76952PWPR, the LTC6811IG-1#PBF provides superior RF immunity via isoSPI, tighter measurement accuracy (±1.2 mV vs ±1.5–2.5 mV), and automotive qualification - making it the preferred choice for safety-critical, high-voltage, long-string BMS architectures where signal integrity and functional safety are non-negotiable.
Availability
LTC6811IG-1#PBF is available at Aetrix Electronics and suitable for electric vehicle traction battery systems, grid-scale energy storage installations, and uninterruptible power supply designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for LTC6811IG-1#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC6811 product line delivers high-accuracy, high-reliability battery monitoring for ISO 26262-compliant automotive and industrial energy storage systems - engineered to replace legacy LTC6804 designs with enhanced noise immunity, faster acquisition, and integrated diagnostics.
FAQ
What is the maximum number of LTC6811IG-1#PBF devices that can be daisy-chained?
The LTC6811IG-1#PBF supports unlimited daisy-chaining in theory, but practical limits are set by isoSPI timing: cumulative daisy-chain delay (tDSY(D) ≤ 300 ns per device) and signal integrity over 100 m cable. Designs with >32 devices require careful PCB layout and termination; Analog Devices validates up to 16 nodes in reference designs for automotive ECU integration. The LTC6811IG-1#PBF's 1 Mb/s rate and built-in skew compensation maintain synchronization across full chains.
Does the LTC6811IG-1#PBF support both lithium-ion and lithium iron phosphate (LFP) battery chemistries?
Yes, the LTC6811IG-1#PBF supports both chemistries. Its 0 V to 5 V per-cell input range covers LFP's 2.5–3.65 V nominal range and NMC/NCA's 2.7–4.2 V range. The ±1.2 mV total measurement error ensures <0.5% SOC uncertainty for LFP at 3.2 V and <0.3% for NMC at 3.7 V. Built-in open-wire detection and reference monitoring further enable chemistry-agnostic fault diagnosis in multi-chemistry battery systems.
How does the LTC6811IG-1#PBF achieve ISO 26262 compliance?
The LTC6811IG-1#PBF supports ISO 26262 ASIL-B compliance through integrated diagnostics: periodic reference voltage monitoring (VREF1/VREF2), ADC self-test sequences, open-wire detection on all cell inputs, and watchdog timer with configurable timeout. Its AEC-Q100 Grade I qualification, failure-in-time (FIT) rate of <100 FIT, and safety manual documenting diagnostic coverage (92% for voltage measurement path) enable systematic safety analysis. The LTC6811IG-1#PBF itself is not certified ASIL-B, but is qualified as a component for ASIL-B systems.
Can the LTC6811IG-1#PBF operate without an external microcontroller?
No, the LTC6811IG-1#PBF requires an external host processor for configuration, command issuance, and data interpretation. It has no embedded firmware or autonomous decision-making capability. However, its isoSPI interface allows the host to manage hundreds of devices over two wires, and GPIO pins can be configured as I²C/SPI masters to offload sensor polling - reducing MCU overhead. The LTC6811IG-1#PBF enters 4 µA sleep mode when idle, awaiting host wake commands.
What is the purpose of the ISOMD pin on the LTC6811IG-1#PBF?
The ISOMD pin selects the communication interface mode: when tied to V–, the LTC6811IG-1#PBF operates in LTC6811-1 daisy-chain isoSPI mode (default for high-voltage stacks); when tied to VREG, it enables LTC6811-2 parallel-addressed mode using standard SPI. This pin physically reconfigures internal pin functions - e.g., SDO/SDI/SCK/CSB become NC in isoSPI mode, while IMA/IPA become active in SPI mode. Incorrect ISOMD routing disables communication entirely.
LTC6811IG-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-FSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1 ~ 12
- Fault Protection:
- Over Temperature
- Interface:
- SPI
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
LTC6811IG-1#PBF FAQ
1.How can I place an order for LTC6811IG-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6811IG-1#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC6811IG-1#PBF reliable?
The price and inventory of LTC6811IG-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6811IG-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC6811IG-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6811IG-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6811IG-1#PBF?
LTC6811IG-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6811IG-1#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC6811IG-1#PBF?
For technical support, including LTC6811IG-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6811IG-1#PBF requirements.
6.How does Aetrix verify that LTC6811IG-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6811IG-1#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC6811IG-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC6811IG-1#PBF?
All LTC6811IG-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6811IG-1#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC6811IG-1#PBF part is unused and in its original packaging.
Return procedure for LTC6811IG-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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