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Analog Devices Inc. LTC6803IG-2#PBF
- Part No.:
- LTC6803IG-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 44-FSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC6803IG-2#PBF.pdf
- Description:
- IC BATT MON MULTI 1-12C 44SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:731
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Product details
Overview
LTC6803IG-2#PBF from Analog Devices (formerly Linear Technology) is a second-generation 12-cell battery monitor IC with integrated 12-bit delta-sigma ADC, precision 3.065V reference, passive cell balancing MOSFETs, and individually addressable SPI interface. It measures up to 12 series-connected Li-ion, lead-acid, or supercapacitor cells with ±2.8mV total measurement error at 3.6V, supports stackable architecture for >100-cell systems, and operates from –40°C to 85°C in automotive and industrial BMS applications.
For engineers reviewing the LTC6803IG-2#PBF datasheet, LTC6803IG-2#PBF pinout, LTC6803IG-2#PBF application, or LTC6803IG-2#PBF equivalent, key selection criteria include its 44-lead SSOP package, V–-tied C0 architecture enabling drop-in replacement for LTC6802-2, 13ms full-stack measurement time, 12µA standby current, and ISO 26262 suitability for functional safety-critical battery monitoring.
Technical Context
The LTC6803IG-2#PBF implements a high-EMI-immunity delta-sigma ADC with built-in noise filtering and open-wire fault detection across all 12 cell inputs. Its internal 8ppm/°C voltage reference and multiplexer support simultaneous measurement of cell voltages, die temperature, and two external thermistor channels referenced to V–.
It features hardware shutdown (<1nA supply current), standby mode (12µA), and configurable measure modes (55–1000µA) controlled via CDC[2:0] bits. The S1–S12 pins integrate 20Ω NMOS discharge switches and support external FET drive via pull-up PMOS, while the SPI-compatible serial interface (1MHz, packet error checking) enables daisy-chained or isolated multi-device stacks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Measurement Error | ±2.8 mV at 3.6V cell voltage - guarantees ≤0.25% accuracy for Li-ion cell monitoring under full temp range. |
| Measurement Time | 13 ms for all 12 cells - enables rapid state-of-charge updates in dynamic EV and ESS applications. |
| Supply Current (Standby) | 12 µA at V+ = 44V - minimizes parasitic drain during idle periods in always-on BMS. |
| Cell Input Range | –0.3 V to 5 V per cell - supports zero/negative voltages common in supercapacitors and fuel cells. |
| Discharge Switch RDS(on) | 20 Ω max - defines minimum external resistor value for thermal management during passive balancing. |
| Serial Interface Speed | 1 MHz SPI with packet error checking - ensures robust communication in noisy automotive environments. |
| Operating Temp Range | –40°C to +85°C - qualified for under-hood and industrial battery pack deployments. |
Pinout & Package
Package: 44-lead plastic SSOP (G package), 0.209" width, JEDEC MS-013AC, θJA = 70°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive power supply input | Must exceed highest cell stack potential; enables zero-current shutdown when floated. |
| V– | Negative supply reference | Internally connected to C0 in LTC6803IG-2#PBF - establishes Kelvin reference for bottom cell. |
| C0–C12 | Cell voltage inputs | C0 tied to V– internally; C1–C12 monitor successive cell potentials up to 75V total stack. |
| S1–S12 | Cell balancing switch outputs | Integrated 20Ω NMOS FETs; also drive external balancing circuits via internal pull-up PMOS. |
| SDO/SDI/SCKI/CSBI | SPI serial interface | 1MHz TTL-level interface with packet error checking; supports up to 16 daisy-chained devices. |
| A0–A3 | Device address inputs | Set unique 4-bit address (VREG = 1, V– = 0) for individual addressing in multi-IC stacks. |
| VREF | Precision voltage reference output | 3.065V ±0.045V, 8ppm/°C TC - used as ADC reference and thermistor bias source. |
| VTEMP1/VTEMP2 | External temperature sensor inputs | Dual ADC channels for NTC thermistors; measurements referenced to VREF and V–. |
Key Features
| Feature | Design Value |
|---|---|
| Delta-sigma ADC with noise filter | 12-bit resolution with inherent rejection of 50/60Hz EMI - eliminates need for external line-frequency filtering in industrial BMS. |
| Open-wire connection detection | Active current injection (70–140µA) on all cell inputs - identifies broken sense wire faults before cell imbalance occurs. |
| Hardware shutdown mode | <1nA supply current with V+ floating - enables true zero-power storage for long-term battery backup systems. |
| Onboard die temperature sensor | ±5°C error over –40°C to 125°C - provides real-time thermal derating feedback for balancing FETs and system safety logic. |
| ISO 26262 compliance support | Built-in self-tests (BST), watchdog timer timeout (1–2.5s), and register CRC - reduces ASIL-B diagnostic coverage effort. |
Applications
| Electric Vehicle Battery Packs | Industrial Energy Storage Systems |
|---|---|
|
Use Scenario: Monitoring 96-cell LiNiMnCoO₂ traction battery in BEV with isolated multi-tier stack architecture. IC Role / Device Role / Timing Role: Primary cell voltage acquisition IC; performs synchronized 13ms full-stack measurements triggered by MCU every 100ms. Use Value: Enables accurate SOC/SOH estimation and cell-level overvoltage protection with <±2.8mV error - critical for ASIL-C functional safety compliance. |
Use Scenario: Supervising 48-cell LFP battery string in grid-scale UPS with redundant isolation barriers. IC Role / Device Role / Timing Role: Stackable BMS front-end; communicates via opto-isolated SPI to master controller with packet error checking. Use Value: 12µA standby current extends maintenance-free operation to >10 years; open-wire detection prevents false undervoltage alarms during cable degradation. |
| High-Power Portable Tools | Electric Two-Wheelers |
|
Use Scenario: 20-cell 52V battery pack in cordless angle grinder with active thermal management. IC Role / Device Role / Timing Role: Integrated cell monitor and balancer; uses GPIO1/GPIO2 to enable/disable cooling fan and charge enable FET. Use Value: Internal 20Ω balancing FETs dissipate heat externally via series resistors - avoids die overheating during 5A continuous balancing. |
Use Scenario: 13-cell 48V battery in e-scooter with embedded temperature monitoring at cell and pack level. IC Role / Device Role / Timing Role: Dual thermistor interface (VTEMP1/VTEMP2) feeds real-time data to MCU for charge rate limiting and thermal cutoff. Use Value: On-die temperature sensor + external NTC inputs provide cross-validated thermal data - meets UN38.3 thermal runaway prevention requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6804IG-2#PBF | Higher integration: adds 5V regulator, improved VREF stability (5ppm/°C), and enhanced ESD rating (±8kV HBM). | Supports higher-reliability automotive modules requiring extended temperature validation and lower drift. | Select LTC6804IG-2#PBF when upgrading from LTC6803IG-2#PBF for tighter reference stability and extended qualification. |
| MAX17852GCM+ | Different architecture: 16-channel, 14-bit SAR ADC, integrated hot-swap controller, but no internal balancing FETs. | Requires external balancing circuitry; targets high-precision HEV battery packs with complex fault logging. | Choose MAX17852GCM+ only if 14-bit resolution and hot-swap control outweigh loss of integrated balancing and higher BOM cost. |
Compared with LTC6804IG-2#PBF, the LTC6803IG-2#PBF offers proven drop-in compatibility with LTC6802-2 designs and lower system cost, while MAX17852GCM+ trades integrated balancing for higher resolution and dedicated safety features - making LTC6803IG-2#PBF optimal for cost-sensitive, ISO 26262-compliant 12-cell BMS where passive balancing suffices.
Availability
LTC6803IG-2#PBF is available at Aetrix Electronics and suitable for electric vehicle battery packs, industrial energy storage systems, and high-power portable tools requiring stable component supply, long lifecycle support, and automotive-grade reliability.
Supply support for LTC6803IG-2#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. (ADI) acquired Linear Technology in 2017 and maintains its high-performance analog and mixed-signal product lines, including precision battery management ICs.
The LTC6803IG-2#PBF belongs to ADI's LTC® battery monitor family, engineered specifically for functional safety-compliant, high-accuracy, multi-cell battery stack monitoring in automotive, industrial, and renewable energy applications.
FAQ
What is the maximum total battery stack voltage supported by the LTC6803IG-2#PBF?
The LTC6803IG-2#PBF supports a total supply voltage (V+ to V–) up to 75V per device. When stacked, multiple LTC6803IG-2#PBF units can monitor longer strings - for example, eight devices support up to 96 cells at 3.6V nominal each (345.6V). Absolute maximum ratings specify C12 input up to 75V relative to V–, and inter-pin differential limits ensure safe operation under transient conditions.
Does the LTC6803IG-2#PBF require external components for basic operation?
Yes, the LTC6803IG-2#PBF requires external bypass capacitors: 1µF on VREF and VREG pins, plus 0.1µF ceramic on V+ and V–. A pull-up resistor on SDO is mandatory for SPI operation. For passive balancing, an external current-limiting resistor must be placed in series with each S1–S12 output to manage power dissipation outside the IC package.
How does the LTC6803IG-2#PBF differ from the LTC6803IG-4#PBF in pin configuration and use case?
The LTC6803IG-2#PBF internally connects C0 to V–, making it pin-compatible with LTC6802-2 for drop-in upgrades. The LTC6803IG-4#PBF separates C0 and V– into distinct pins, enabling Kelvin sensing for improved Cell 1 measurement accuracy and better noise immunity. Use LTC6803IG-2#PBF for legacy designs; choose LTC6803IG-4#PBF for new supercapacitor or high-precision applications.
Can the LTC6803IG-2#PBF operate without an isolated power supply?
Yes, the LTC6803IG-2#PBF can operate from a non-isolated supply tied to the battery stack's V–, but isolation is recommended for multi-level stacks to prevent ground loops and improve noise immunity. In isolated configurations, V+ is powered from a local DC/DC converter, reducing stack current draw to zero during hardware shutdown - a key advantage for long-term storage.
What diagnostic capabilities does the LTC6803IG-2#PBF provide for functional safety compliance?
The LTC6803IG-2#PBF includes built-in self-tests (BST), open-wire detection on all cell inputs, watchdog timer with 1–2.5s timeout, register CRC verification, and die temperature monitoring. These features directly support ISO 26262 ASIL-B decomposition by enabling systematic fault detection and safe state transitions - confirmed in Analog Devices' Functional Safety Manual for the LTC6803 family.
LTC6803IG-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-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:
- Serial
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-SSOP
LTC6803IG-2#PBF FAQ
1.How can I place an order for LTC6803IG-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6803IG-2#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 LTC6803IG-2#PBF reliable?
The price and inventory of LTC6803IG-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6803IG-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC6803IG-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6803IG-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6803IG-2#PBF?
LTC6803IG-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6803IG-2#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 LTC6803IG-2#PBF?
For technical support, including LTC6803IG-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6803IG-2#PBF requirements.
6.How does Aetrix verify that LTC6803IG-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6803IG-2#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 LTC6803IG-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC6803IG-2#PBF?
All LTC6803IG-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6803IG-2#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 LTC6803IG-2#PBF part is unused and in its original packaging.
Return procedure for LTC6803IG-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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