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Analog Devices Inc. LTC6804IG-2#3ZZPBF
- Part No.:
- LTC6804IG-2#3ZZPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 48-FSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC6804IG-2#3ZZPBF.pdf
- Description:
- IC BATT MON MULTI 1-12C 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,026
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Product details
Overview
LTC6804IG-2#3ZZPBF from Analog Devices (formerly Linear Technology) is a 3rd-generation multicell battery stack monitor IC designed for high-voltage battery management systems. It measures up to 12 series-connected cells with ≤1.2mV total measurement error, 290µs full-cell acquisition time, and supports daisy-chain or parallel isoSPI configurations. It operates across –40°C to +85°C and integrates passive cell balancing, 5V regulator, and 5 GPIOs-used in EV battery packs and grid storage.
For engineers reviewing the LTC6804IG-2#3ZZPBF datasheet, LTC6804IG-2#3ZZPBF pinout, LTC6804IG-2#3ZZPBF application, or LTC6804IG-2#3ZZPBF equivalent, key selection criteria include isoSPI topology mode (LTC6804-2 parallel addressing), filtered/normal/fast ADC modes, ±1.2mV TME over temperature, 48-lead SSOP package compatibility, and V+ supply range (11–55V) for direct battery connection.
Technical Context
The LTC6804IG-2#3ZZPBF implements a 16-bit delta-sigma ADC with programmable 3rd-order noise filtering and three selectable conversion modes: Fast (≤1.185ms for 12 cells), Normal (≤2.48ms), and Filtered (≤213.5ms). Its isoSPI interface operates at 1Mbps using a single twisted pair, with ISOMD pin configuration enabling parallel host addressing-distinct from LTC6804-1's daisy-chain mode.
It features synchronized voltage/current measurement capability, on-chip 5V regulator (±0.25% accuracy), dual precision references (VREF1: 3.2V ±10ppm/°C; VREF2: 3.0V ±0.01V), and passive balancing with programmable discharge timer. Sleep mode draws only 4µA, and thermal shutdown activates at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell count | Measures up to 12 series-connected battery cells-supports modular BMS designs for EV traction packs and ESS stacks. |
| Total measurement error | ≤±1.2mV in Normal Mode over –40°C to +85°C-ensures SOC estimation accuracy within ±0.05% for 3.3V Li-ion cells. |
| ADC acquisition time | 290µs for all 12 cells in Normal Mode-enables fast state-of-charge updates during dynamic load transients. |
| isoSPI interface | 1Mbps isolated serial interface with RF immunity; LTC6804-2 variant supports parallel addressing via A0–A3 pins. |
| Supply voltage range | V+ = 11V to 55V-allows direct connection to 12S–15S Li-ion or LFP battery strings without external regulators. |
| Sleep current | 4µA typical-extends standby life in always-on BMS applications such as backup power systems. |
| Package | 48-lead plastic SSOP (G package)-compatible with standard surface-mount assembly and provides thermal resistance θJA = 55°C/W. |
Pinout & Package
Package: 48-lead plastic SSOP (G package), 0.25mm pitch, exposed pad not present. Thermal resistance θJA = 55°C/W; max junction temperature = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Main supply input | Accepts 11–55V battery stack voltage; powers analog core and internal regulator. |
| C0–C12 | Cell voltage inputs | Differential inputs for measuring 12 series cells (C0 to C12); C12 is top-cell reference. |
| S1–S12 | Cell balancing switch outputs | Drain terminals of internal MOSFETs for passive balancing; each connects to S(n) node. |
| ISOMD | isoSPI mode select | Configures interface: tied to VREG enables parallel addressing (LTC6804-2); tied to V– enables daisy-chain (LTC6804-1). |
| A0–A3 | Device address inputs | 4-bit hardware address for parallel isoSPI bus-required for LTC6804-2 multi-device arbitration. |
| VREG | Onboard 5V regulator output | Supplies digital logic and external peripherals; ±0.25% accuracy over temperature. |
| GPIO1–GPIO5 | Configurable I/O | Support temperature sensing, digital I/O, or SPI/I²C master functions-enables auxiliary monitoring without extra ICs. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable ADC filter modes | Three modes (Fast/Normal/Filtered) trade off speed vs noise rejection-enables optimization for noisy automotive or quiet grid storage environments. |
| isoSPI parallel addressing | LTC6804-2 variant uses A0–A3 pins to assign unique addresses-eliminates timing skew in large stacks versus daisy-chain latency accumulation. |
| Passive balancing with timer control | Internal MOSFETs (RDS(on) ≤25Ω at 3.6V) support programmable discharge duration-reduces BOM cost by removing external FETs and timers. |
| Dual precision voltage references | VREF1 (3.2V ±10ppm/°C) and VREF2 (3.0V ±0.01V) enable ratiometric measurements and high-accuracy calibration-critical for ISO 26262 ASIL-B compliance. |
| Integrated 5V regulator | Delivers up to 50mA at ±0.25% regulation-powers MCU, sensors, or isolators directly, reducing external component count. |
Applications
| Electric Vehicle Battery Packs | Grid-Scale Energy Storage |
|---|---|
Use Scenario: Monitoring 12S–24S lithium iron phosphate (LFP) or NMC battery modules in traction inverters and DC-DC converters. IC Role / Device Role / Timing Role: Primary cell voltage and temperature monitor; synchronizes measurements across modules via isoSPI clock distribution. Use Value: ≤1.2mV TME ensures <±0.5% SOC error over lifetime, supporting predictive maintenance and warranty analytics. | Use Scenario: Supervising 48S–96S battery strings in utility-scale containerized ESS with centralized BMS controllers. IC Role / Device Role / Timing Role: Stackable sensor node providing isolated, synchronized cell data to master controller via 100m isoSPI bus. Use Value: Parallel addressing (LTC6804-2) reduces system-level measurement latency by >40% vs daisy-chain in 20+ device stacks. |
| Backup Power Systems | High-Power Portable Equipment |
Use Scenario: Maintaining runtime integrity in telecom base station UPS and medical emergency power units with sealed lead-acid or Li-ion batteries. IC Role / Device Role / Timing Role: Low-power monitoring IC in sleep mode (4µA), awakened periodically to verify cell health and balance drift. Use Value: 4µA sleep current extends self-test interval to >72 hours on coin-cell backup, minimizing maintenance cycles. | Use Scenario: Real-time cell supervision in cordless power tools, e-bikes, and industrial handhelds with 10–15S battery packs. IC Role / Device Role / Timing Role: High-speed ADC (290µs full scan) captures transient overvoltage events during motor commutation spikes. Use Value: Fast-mode acquisition detects >5V overvoltage in <1.2ms-triggering immediate disconnect before cell damage occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multicell battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ76942 | TI part with integrated protection FET drivers and 14-cell support; no isoSPI-uses standard SPI with external isolators. | Requires external isolation components and PCB layout changes; lacks built-in 5V regulator. | Select when needing integrated charge/discharge FET control and higher cell count, but accept added isolation complexity. |
| MAX17852 | Maxim part with isoSPI interface and 16-cell support; ±1.5mV TME; requires external 3.3V supply for digital core. | Higher measurement error and no onboard regulator increase BOM cost and reduce noise immunity in high-EMI environments. | Select for larger stacks (>12 cells) where ±1.5mV TME is acceptable and external supply is already available. |
Compared with BQ76942 and MAX17852, the LTC6804IG-2#3ZZPBF delivers superior measurement accuracy (±1.2mV), integrated 5V regulation, and true galvanic isolation via isoSPI-making it optimal for safety-critical, high-reliability BMS where signal integrity and component count reduction are prioritized.
Availability
LTC6804IG-2#3ZZPBF is available at Aetrix Electronics and suitable for electric vehicle battery packs, grid energy storage systems, and backup power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LTC6804IG-2#3ZZPBF 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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management product lines with emphasis on precision, reliability, and automotive-grade qualification.
The LTC6804 product line was engineered specifically for ISO 26262-compliant battery management systems in electric vehicles and industrial energy storage-delivering metrology-grade accuracy, functional safety features, and robust isolated communication.
FAQ
What is the maximum number of cells the LTC6804IG-2#3ZZPBF can monitor in a single device?
The LTC6804IG-2#3ZZPBF monitors up to 12 series-connected battery cells per device. Its stackable architecture allows multiple LTC6804IG-2#3ZZPBF units to be connected in parallel via isoSPI, enabling monitoring of hundreds of cells in high-voltage battery strings used in EVs and grid storage systems.
How does the LTC6804IG-2#3ZZPBF differ from the LTC6804-1 variant?
The LTC6804IG-2#3ZZPBF implements parallel isoSPI addressing using A0–A3 pins, allowing independent communication with each device on a shared bus. In contrast, the LTC6804-1 uses daisy-chain topology where commands propagate sequentially-introducing cumulative latency. This makes LTC6804IG-2#3ZZPBF preferable for time-critical, large-stack BMS applications.
What are the supported ADC measurement modes and their typical use cases for the LTC6804IG-2#3ZZPBF?
The LTC6804IG-2#3ZZPBF offers Fast (≤1.185ms), Normal (≤2.48ms), and Filtered (≤213.5ms) ADC modes. Fast mode suits transient overvoltage detection in power tools; Normal mode balances speed and noise rejection for EV drivetrains; Filtered mode achieves highest SNR for precision SOC estimation in stationary ESS applications.
Does the LTC6804IG-2#3ZZPBF require an external power supply, or can it operate directly from the battery stack?
The LTC6804IG-2#3ZZPBF can operate directly from the battery stack via its V+ pin (11–55V range) and includes an onboard 5V regulator (VREG) that supplies digital circuitry and external peripherals. No external supply is required, simplifying BMS design and improving fault tolerance in high-voltage systems.
What is the total measurement error specification for the LTC6804IG-2#3ZZPBF over temperature?
The LTC6804IG-2#3ZZPBF guarantees a total measurement error (TME) of ≤±1.2mV in Normal Mode across the full operating temperature range of –40°C to +85°C. This specification applies to differential cell voltage measurements (Cn to Cn–1) at 3.3V input and ensures high-accuracy state-of-charge calculation in automotive and industrial applications.
LTC6804IG-2#3ZZPBF 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/Under Voltage
- Interface:
- I2C, SPI
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
LTC6804IG-2#3ZZPBF FAQ
1.How can I place an order for LTC6804IG-2#3ZZPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6804IG-2#3ZZPBF 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 LTC6804IG-2#3ZZPBF reliable?
The price and inventory of LTC6804IG-2#3ZZPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6804IG-2#3ZZPBF is usually 5 days.
3.What payment methods are accepted for LTC6804IG-2#3ZZPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6804IG-2#3ZZPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6804IG-2#3ZZPBF?
LTC6804IG-2#3ZZPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6804IG-2#3ZZPBF 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 LTC6804IG-2#3ZZPBF?
For technical support, including LTC6804IG-2#3ZZPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6804IG-2#3ZZPBF requirements.
6.How does Aetrix verify that LTC6804IG-2#3ZZPBF is sourced from the original manufacturer or authorized distributors?
All LTC6804IG-2#3ZZPBF 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 LTC6804IG-2#3ZZPBF meets industry standards.
7.What is the process for return or replacement of LTC6804IG-2#3ZZPBF?
All LTC6804IG-2#3ZZPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6804IG-2#3ZZPBF, 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 LTC6804IG-2#3ZZPBF part is unused and in its original packaging.
Return procedure for LTC6804IG-2#3ZZPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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