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Analog Devices Inc. LTC6803IG-3#TRPBF
- Part No.:
- LTC6803IG-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 44-FSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC6803IG-3#TRPBF.pdf
- Description:
- IC BATT MON MULTI 1-12C 44SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:415
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Product details
Overview
LTC6803IG-3#TRPBF 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, Kelvin-connected C0 input for enhanced Cell 1 accuracy, and daisy-chainable isolated serial interface. It supports passive cell balancing via internal 20Ω NMOS switches, measures cell voltages up to 5V with ±2.8mV total error at 3.6V, and operates from –40°C to 85°C in electric vehicle battery management systems.
For engineers reviewing the LTC6803IG-3#TRPBF datasheet, LTC6803IG-3#TRPBF pinout, LTC6803IG-3#TRPBF application, or LTC6803IG-3#TRPBF equivalent, key selection criteria include its C0 Kelvin configuration for improved low-voltage cell measurement, 13ms full-stack conversion time, ISO26262 suitability, 12µA standby current, and compatibility with Li-ion, LiFePO₄, and supercapacitor stacks requiring <0.25% total measurement error.
Technical Context
The LTC6803IG-3#TRPBF implements a delta-sigma ADC with built-in noise filtering and 8ppm/°C reference temperature coefficient, enabling ±2.8mV total measurement error across –40°C to 85°C. Its unique C0 pin separates the bottom cell's negative terminal from V–, eliminating trace IR drop impact on Cell 1 voltage reading and improving common-mode rejection for low-voltage cells.
It uses a level-shifting daisy-chain serial interface with VMODE-selectable voltage/current mode I/O, allowing stackable configurations without optocouplers. The device supports hardware shutdown (<1nA draw), standby (12µA), and measure modes (55–1000µA), with watchdog timer timeout of 1–2.5 seconds and open-wire fault detection using 70–140µA test current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count | Measures up to 12 series-connected cells with dedicated C0–C12 inputs and S1–S12 balancing outputs. |
| Total Measurement Error | ±2.8mV at 3.6V cell voltage over –40°C to 85°C - ensures <0.25% accuracy for Li-ion BMS compliance. |
| Conversion Time | 13ms for all 12 cells - enables fast state-of-charge updates in dynamic EV traction battery monitoring. |
| Supply Current (Standby) | 12µA typical - minimizes parasitic drain in always-on battery pack supervision circuits. |
| Discharge FET RDS(on) | 20Ω max - defines minimum external balancing resistor value for thermal management of internal discharge paths. |
| Reference Voltage | 3.065V ±35mV with 8ppm/°C TC - provides stable scaling for ADC without external reference components. |
| Operating Temp Range | –40°C to 85°C (Industrial grade) - validated for under-hood and battery enclosure environments. |
Pinout & Package
Package: 44-lead plastic SSOP (G package), 0.209" wide, RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C0 (Pin 29) | Bottom cell negative terminal input | Enables Kelvin sensing for Cell 1; eliminates V– trace resistance error - critical for sub-100mV offset accuracy. |
| V– (Pin 30) | Negative supply reference | Common return for all analog inputs except C0; must be connected to stack ground with low-inductance path. |
| S1–S12 (Pins 6,8,10,...,28) | Cell balancing switch outputs | Open-drain NMOS with 20Ω RDS(on); drive external FET gates or dissipate heat externally via series resistor. |
| CSBI/CSBO (Pins 44/1) | Serial chip select in/out | Level-shifted daisy-chain control: CSBO drives next device's CSBI, enabling >100-cell stacks without isolators. |
| VMODE (Pin 40) | Interface mode selector | Tie to VREG for TTL-level I/O (bottom of stack); tie to V– for current-mode daisy-chain (middle/top devices). |
Key Features
| Feature | Design Value |
|---|---|
| C0 Kelvin connection | Eliminates PCB trace resistance impact on Cell 1 measurement - improves low-voltage accuracy by up to 5mV vs LTC6803-1. |
| Daisy-chain isolation | Level-shifting serial interface allows >100-cell monitoring with no optocouplers or DC/DC isolators - reduces BOM cost and board space. |
| Integrated watchdog timer | 1–2.5s timeout resets config register and disables balancing FETs - prevents unsafe cell over-discharge during host MCU failure. |
| On-die temperature sensor | ±5°C die temp measurement error - enables real-time thermal derating of balancing current to prevent thermal runaway. |
| Open-wire detection | 70–140µA test current identifies broken cell connections before system startup - avoids false OV/UV alarms in field operation. |
Applications
| Electric Vehicle Traction Battery | Backup Telecom Power System |
|---|---|
Use Scenario: Monitoring 96-cell LiNiMnCoO₂ stack in 400V EV powertrain with active thermal management. IC Role / Device Role / Timing Role: Primary cell voltage acquisition node; performs synchronized 13ms full-stack measurements triggered by MCU every 100ms. Use Value: C0 Kelvin input ensures accurate Cell 1 reading under high-current transients, preventing false undervoltage trips that could disable propulsion. | Use Scenario: Supervising 48-cell lead-acid backup bank in cellular base station with remote telemetry. IC Role / Device Role / Timing Role: Standalone BMS node communicating via RS-485 to central controller; enters 12µA standby between hourly health checks. Use Value: Hardware shutdown mode draws <1nA when V+ disconnected - preserves battery charge during extended grid outages. |
| High-Power E-Bike Battery Pack | Grid-Scale Energy Storage Module |
Use Scenario: 24S LiFePO₄ pack (76.8V nominal) with integrated passive balancing and temperature monitoring. IC Role / Device Role / Timing Role: Measures all 12 cells per IC across two daisy-chained LTC6803IG-3#TRPBF units; uses GPIO1 to enable external fan control. Use Value: Internal 20Ω balancing FETs + external 10Ω resistors dissipate 1.5W per cell safely - extends cycle life without adding discrete MOSFETs. | Use Scenario: Modular 12S–24S lithium titanate (LTO) string in containerized ESS with CAN-based master controller. IC Role / Device Role / Timing Role: Slave node in multi-tier BMS; reports cell voltages and die temperature via isolated SPI-to-CAN bridge. Use Value: 1MHz serial interface with packet error checking ensures robust communication in high-EMI substation environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6804IG-3#TRPBF | 16-cell capacity, improved ±1.5mV measurement error, integrated 5V regulator for auxiliary loads | Supports larger stacks per node; higher accuracy required for premium EV platforms | Select when upgrading from 12S to 16S architecture or requiring tighter voltage tolerance. |
| BQ76PL536APMR | TI 16-channel monitor with integrated safety processor, ASIL-B ready, different pinout and SPI protocol | Designed for automotive ASIL-B compliance; includes independent voltage/temperature watchdogs | Select for new automotive designs requiring ISO26262 certification beyond functional safety features. |
Compared with LTC6804IG-3#TRPBF and BQ76PL536APMR, the LTC6803IG-3#TRPBF offers optimal cost-performance balance for industrial and commercial BMS where 12-cell granularity, Kelvin C0 accuracy, and proven daisy-chain reliability are prioritized over automotive certification or extended cell count.
Availability
LTC6803IG-3#TRPBF is available at Aetrix Electronics and suitable for electric vehicle traction batteries, backup telecom power systems, and high-power e-bike battery packs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC6803IG-3#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 acquired Linear Technology in 2017, inheriting its precision analog and power management portfolio including the LTC® battery monitoring family.
The LTC6803 product line was engineered specifically for high-reliability, stackable battery management in electric transportation and energy storage, emphasizing measurement accuracy, fault resilience, and isolation-free scalability.
FAQ
What distinguishes LTC6803IG-3#TRPBF from LTC6803IG-1#TRPBF?
The LTC6803IG-3#TRPBF features a dedicated C0 pin for Kelvin connection to the bottom cell's negative terminal, separating it from V– to eliminate PCB trace resistance error and improve Cell 1 measurement accuracy. In contrast, the LTC6803IG-1#TRPBF internally connects C0 to V–, making it pin-compatible with LTC6802-1 but less accurate for low-voltage cells. This structural difference directly impacts BMS calibration stability and fault detection sensitivity in production systems.
Does LTC6803IG-3#TRPBF support daisy-chaining without external isolators?
Yes, the LTC6803IG-3#TRPBF supports true isolator-free daisy-chaining via its level-shifting serial interface. When VMODE is tied to V–, pins SCKI, SDI, and CSBI operate in current mode, allowing direct connection to SCKO, SDOI, and CSBO of adjacent devices. This architecture enables monitoring of >100-series cells using only passive diodes for voltage translation - verified in Figure 1 of the datasheet and widely deployed in EV battery packs.
What is the maximum cell voltage the LTC6803IG-3#TRPBF can measure accurately?
The LTC6803IG-3#TRPBF measures cell voltages from –0.3V to 5V with guaranteed specifications. At 3.6V, total measurement error is ±2.8mV (0.078%) over –40°C to 85°C. The absolute maximum rating for C12 relative to V– is 75V, but per-cell differential input range remains 5V full-scale - sufficient for Li-ion (4.2V), LiFePO₄ (3.65V), and LTO (2.8V) chemistries without attenuation.
How does the watchdog timer in LTC6803IG-3#TRPBF enhance system safety?
The watchdog timer in LTC6803IG-3#TRPBF asserts WDTB (active-low) after 1–2.5 seconds of no valid serial command, automatically resetting the configuration register and disabling all S1–S12 balancing FETs. This prevents uncontrolled cell discharge during host MCU lockup or communication failure - a critical fail-safe mechanism validated for ISO26262 ASIL-B compliance in automotive BMS designs.
Can LTC6803IG-3#TRPBF measure temperature directly?
Yes, the LTC6803IG-3#TRPBF integrates a die temperature sensor with ±5°C error and provides two external thermistor inputs (VTEMP1, VTEMP2) referenced to V–. These pins accept 0–5.125V signals, enabling direct connection of NTC/PTC thermistors with simple resistor dividers. Temperature data is digitized by the same 12-bit ADC used for cell voltages and stored in dedicated TMP registers for host MCU retrieval.
LTC6803IG-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-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/Under Voltage
- Interface:
- Serial
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-SSOP
LTC6803IG-3#TRPBF FAQ
1.How can I place an order for LTC6803IG-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6803IG-3#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 LTC6803IG-3#TRPBF reliable?
The price and inventory of LTC6803IG-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6803IG-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6803IG-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6803IG-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6803IG-3#TRPBF?
LTC6803IG-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6803IG-3#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 LTC6803IG-3#TRPBF?
For technical support, including LTC6803IG-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6803IG-3#TRPBF requirements.
6.How does Aetrix verify that LTC6803IG-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6803IG-3#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 LTC6803IG-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6803IG-3#TRPBF?
All LTC6803IG-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6803IG-3#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 LTC6803IG-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC6803IG-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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