My Inquiry
My Account
Analog Devices Inc. LTC6811IG-2#TRPBF
- Part No.:
- LTC6811IG-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 48-FSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC6811IG-2#TRPBF.pdf
- Description:
- IC BATT MON MULTI 1-12C 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,022
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC6811IG-2#TRPBF from Analog Devices is a 12-cell battery stack monitor IC designed for high-voltage battery management systems, delivering ≤1.2 mV total measurement error across 0 V to 5 V per cell, 290 µs full-cell acquisition time, and isoSPI-enabled daisy-chain or parallel multi-device architectures. It supports passive cell balancing with per-cell PWM control, operates from –40°C to 85°C, and is AEC-Q100 qualified for automotive battery monitoring.
For engineers reviewing the LTC6811IG-2#TRPBF datasheet, LTC6811IG-2#TRPBF pinout, LTC6811IG-2#TRPBF application, or LTC6811IG-2#TRPBF equivalent, this page provides verified technical context, real-world timing and noise performance data, ISO 26262 diagnostic architecture details, and validated alternative options for BMS designs requiring synchronized voltage/current measurement and RF-immune communication over twisted-pair cables up to 100 meters.
Technical Context
The LTC6811IG-2#TRPBF implements a 16-bit ADC with programmable noise filtering (Normal/Filtered/Fast modes), achieving ±0.2 mV typical total measurement error at 3.3 V cell input in Normal mode. Its isoSPI interface operates at 1 Mb/s using a single twisted pair, with built-in common-mode rejection and wake-up detection via differential voltage thresholds.
As the -2 variant, it supports parallel connection to a host processor with individual device addressing via A0–A3 pins, unlike the -1 daisy-chain topology. The device integrates an on-board 5 V regulator (VREG), five configurable GPIOs usable as digital I/O or analog inputs, and a 4 µA sleep mode current - all within a 48-lead SSOP package rated for automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell count | Measures up to 12 series-connected cells with independent C0–C12 inputs. |
| Total measurement error | ≤±1.2 mV max over full temp range; enables accurate SoC estimation in Li-ion and LFP packs. |
| Acquisition time | 290 µs for all 12 cells in Normal mode; critical for fast transient response in EV traction batteries. |
| isoSPI data rate | 1 Mb/s isolated serial interface with <100 m cable reach and low EMI susceptibility. |
| Sleep current | 4 µA typical; extends standby life in always-on BMS applications like grid storage. |
| Operating temp | –40°C to +85°C (I-grade); validated for under-hood automotive and industrial environments. |
| Package | 48-lead plastic SSOP (G package); compatible with standard reflow and automated optical inspection. |
Pinout & Package
48-lead plastic SSOP (G package), 0.25 mm pitch, JEDEC MS-012AC compliant. Thermal resistance θJA = 55°C/W; maximum junction temperature 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | High-side supply input | Accepts up to 55 V; powers internal circuitry directly from battery stack top rail. |
| V– | Low-side reference ground | Mandatory connection point; serves as analog and digital reference for all cell measurements. |
| C0–C12 | Cell voltage inputs | Differential inputs measuring voltage between adjacent cells (Cn to Cn−1); support 0–5 V range. |
| S1–S12 | Passive balance switch terminals | Connect to external FETs; each controlled by independent PWM duty cycle register. |
| ISOMD | Interface mode select | Configures SPI (tied to V–) or isoSPI (tied to VREG) operation; determines CSB/SCK/SDI/SDO vs IMA/IPA pin mapping. |
| A0–A3 | Device address inputs | Enable unique addressing of up to 16 LTC6811-2 devices on shared isoSPI bus in parallel topology. |
| GPIO1–GPIO5 | Configurable I/O | Support digital input/output, analog sensing (e.g., thermistor), or I²C/SPI master functions. |
| VREG | On-chip 5 V regulator output | Supplies internal logic and external peripherals; ±0.25% accuracy over temperature. |
Key Features
| Feature | Design Value |
|---|---|
| isoSPI physical layer | 1 Mb/s isolated communication over single twisted pair up to 100 m; eliminates optocouplers and reduces BOM cost. |
| Programmable ADC filter modes | Three selectable acquisition profiles: Fast (1.185 ms), Normal (2.48 ms), Filtered (213.5 ms) - trade speed vs noise rejection. |
| Per-cell PWM balancing control | Independent 8-bit timer registers for S1–S12 allow precise thermal management during charging without external controllers. |
| ISO 26262 diagnostics | Built-in ADC self-test, open-wire detection, CRC checksums, and watchdog timer meet ASIL-B requirements for automotive BMS. |
| Multi-topology scalability | LTC6811-2 supports parallel addressing (A0–A3), enabling modular BMS stacks without signal integrity degradation from long daisy chains. |
Applications
| Electric Vehicle Traction Battery | Grid-Scale Energy Storage System |
|---|---|
|
Use Scenario: Monitoring 400–800 V lithium-ion battery packs in BEV powertrain with real-time cell voltage, temperature, and state-of-charge calculation. IC Role / Device Role / Timing Role: Primary cell voltage acquisition IC; performs synchronized 12-cell measurements every 100 ms with <290 µs latency and isoSPI fault-tolerant reporting. Use Value: Enables compliance with ISO 26262 ASIL-B through integrated diagnostics, reducing validation effort for automotive OEMs. |
Use Scenario: Supervising large-format LFP battery strings in utility-scale solar+storage installations with remote telemetry and thermal runaway prevention. IC Role / Device Role / Timing Role: High-accuracy voltage monitor per module; aggregates data across 10+ LTC6811-2 devices via parallel isoSPI addressing for centralized SCADA integration. Use Value: Delivers ±1.2 mV measurement precision across –25°C to 60°C ambient, ensuring reliable SoH estimation over 10+ year deployments. |
| Hybrid Electric Bus Battery Pack | Industrial UPS Backup System |
|
Use Scenario: Managing 300–600 V NiMH or NMC battery arrays in municipal hybrid buses subject to vibration, wide temperature swings, and frequent charge/discharge cycles. IC Role / Device Role / Timing Role: Ruggedized BMS front-end; uses passive balancing and 4 µA sleep mode to minimize parasitic drain during overnight parking. Use Value: AEC-Q100 qualification ensures reliability under mechanical shock and thermal cycling stress encountered in transit applications. |
Use Scenario: Providing runtime extension and predictive maintenance for mission-critical 48–240 V backup battery banks in data centers and telecom infrastructure. IC Role / Device Role / Timing Role: Precision cell-level health monitor; interfaces with microcontroller via isoSPI to trigger automatic load shedding before deep discharge. Use Value: 290 µs full-stack acquisition enables rapid response to sudden voltage sag events, preventing brownouts during grid transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8452ACPZ-R7 | Single-channel precision amplifier + reference; requires external ADC, MCU, and isolation; no integrated isoSPI or balancing drivers. | Used in custom BMS designs where flexibility outweighs integration; lacks built-in diagnostics and cell-count scalability. | Select when needing ultra-low offset (<10 µV) for specialized chemistries not covered by LTC6811's 0–5 V range. |
| BQ7695200RSMR | 16-cell monitor with integrated FET drivers, but uses UART-based daisy chain (no isoSPI); higher sleep current (12 µA). | Targeted at consumer/portable BMS; not AEC-Q100 qualified; limited to 32 V absolute max V+. | Prefer for cost-sensitive, non-automotive applications below 32 V where UART compatibility simplifies host firmware. |
Compared with AD8452ACPZ-R7 and BQ7695200RSMR, the LTC6811IG-2#TRPBF delivers superior system-level integration - combining isoSPI, passive balancing, ISO 26262 diagnostics, and automotive qualification in one 48-pin SSOP - reducing PCB area, BOM count, and functional safety validation burden for high-voltage EV and grid storage systems.
Availability
LTC6811IG-2#TRPBF is available at Aetrix Electronics and suitable for electric vehicle traction batteries, grid-scale energy storage systems, and industrial uninterruptible power supplies requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for LTC6811IG-2#TRPBF 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 was engineered specifically for high-voltage battery management in safety-critical applications, emphasizing measurement accuracy, robust isolation, and functional safety compliance - especially for ISO 26262 ASIL-B automotive systems.
FAQ
What distinguishes LTC6811IG-2#TRPBF from the LTC6811-1 variant?
The LTC6811IG-2#TRPBF supports parallel isoSPI bus topology with individual device addressing via A0–A3 pins, allowing multiple devices to connect directly to a host processor without daisy-chaining. In contrast, the LTC6811-1 uses a daisy-chain configuration with single host interface. This makes the LTC6811IG-2#TRPBF better suited for modular BMS designs requiring deterministic latency and simplified signal routing across large battery packs.
Does LTC6811IG-2#TRPBF support both SPI and isoSPI interfaces simultaneously?
No - the LTC6811IG-2#TRPBF uses the ISOMD pin to select interface mode: tied to V– enables standard 4-wire SPI (CSB/SCK/SDI/SDO), while tied to VREG enables isoSPI (IPA/IMA/IPB/IMB). Pin functionality is mutually exclusive per configuration; simultaneous operation is not supported. The choice depends on whether galvanic isolation and noise immunity are required in the target application.
How does the passive balancing function work on LTC6811IG-2#TRPBF?
The LTC6811IG-2#TRPBF provides dedicated S1–S12 terminals for connecting external MOSFETs to dissipate excess cell energy during charging. Each Sx pin is controlled by an independent 8-bit PWM register, allowing precise duty-cycle adjustment per cell. Balancing is initiated via command and runs autonomously without host intervention, with current limited by external FET selection and thermal design - no internal balancing FETs are included.
Is LTC6811IG-2#TRPBF qualified for automotive use beyond AEC-Q100?
Yes - the LTC6811IG-2#TRPBF is AEC-Q100 Grade I qualified (–40°C to +85°C) and explicitly engineered for ISO 26262-compliant systems. Its integrated diagnostics - including ADC self-test, open-wire detection, CRC-protected communication, and watchdog timer - support ASIL-B development. Full automotive reliability reports and failure-in-time (FIT) data are available from Analog Devices upon request.
What is the maximum recommended cable length for isoSPI communication with LTC6811IG-2#TRPBF?
Analog Devices specifies reliable isoSPI operation up to 100 meters using standard twisted-pair cable (e.g., CAT5). Performance remains robust due to differential signaling, built-in common-mode rejection, and adaptive wake-up detection. At 100 m, signal integrity is maintained with ≤240 ns dwell time and ≥200 mV differential wake threshold - verified across temperature and voltage extremes in production testing of the LTC6811IG-2#TRPBF.
LTC6811IG-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-FSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-2#TRPBF FAQ
1.How can I place an order for LTC6811IG-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6811IG-2#TRPBF 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-2#TRPBF reliable?
The price and inventory of LTC6811IG-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6811IG-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6811IG-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6811IG-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6811IG-2#TRPBF?
LTC6811IG-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6811IG-2#TRPBF 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-2#TRPBF?
For technical support, including LTC6811IG-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6811IG-2#TRPBF requirements.
6.How does Aetrix verify that LTC6811IG-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6811IG-2#TRPBF 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-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6811IG-2#TRPBF?
All LTC6811IG-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6811IG-2#TRPBF, 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-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC6811IG-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC6811IG-2#TRPBF Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
