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Texas Instruments BQ771811DPJR
- Part No.:
- BQ771811DPJR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
BQ771811DPJR.pdf
- Description:
- IC BATT PROT LI-ION 2-5CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,475
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Product details
Overview
BQ771811DPJR from Texas Instruments is a dedicated overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 1 s internal delay timer, and CMOS active-high output drive. It monitors each cell independently and delivers low-power operation (≈1 µA supply current) for handheld power tools and e-bike battery management systems.
For engineers reviewing the BQ771811DPJR datasheet, BQ771811DPJR pinout, BQ771811DPJR application, or BQ771811DPJR equivalent, key selection criteria include its 4.225 V fixed overvoltage threshold, 0.05 V hysteresis, 8-pin QFN (DPJ) package, and functional safety documentation support - all critical for robust pack-level fault response in portable energy storage.
Technical Context
The BQ771811DPJR implements independent per-cell voltage sensing across five differential inputs (V1–V5 relative to VSS), comparing each against a precision internal reference. Upon detection of any cell exceeding 4.225 V, a fixed 1 s delay timer initiates before asserting the CMOS active-high OUT signal.
It operates from 3 V to 25 V supply (VDD), supports –40°C to 110°C ambient, and integrates noise-filtering design requirements: external RIN/CIN networks per sense input and RVD/CVD on VDD. Customer Test Mode reduces fault detection delay to 15 ms for production-line validation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.225 V - precise fixed trip point for overvoltage shutdown, minimizing false triggers in multi-cell stacks. |
| OVP Accuracy | ±10 mV at 25°C - ensures tight cell voltage control without calibration, critical for Li-ion safety margins. |
| OV Hysteresis | 0.05 V - prevents oscillation during recovery by requiring cell voltage to drop to 4.175 V before reset. |
| Delay Timer | 1 s nominal - deterministic fault response window enabling coordinated pack-level protection sequencing. |
| Supply Current | ≈1 µA (all cells below VPROTECT) - enables ultra-low quiescent power in always-on battery monitoring. |
| Input Leakage | <100 nA per cell input - preserves cell balance and minimizes self-discharge in high-impedance sensing paths. |
| Output Type | CMOS active-high - drives logic-level signals directly without external pull-up, simplifying interface to MCU or FET gate drivers. |
Pinout & Package
Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, wettable flank, RoHS-compliant, MSL Level-1.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated 3–25 V supply; requires external RVD/CVD filter for noise immunity and ESD protection. |
| V5 | Cell 5 positive sense input | Differential input referenced to VSS; monitors top cell voltage in 5-series stack (V5–V4). |
| V4 | Cell 4 positive sense input | Differential input (V4–V3); enables independent monitoring of each series cell without shared reference drift. |
| V3 | Cell 3 positive sense input | Differential input (V3–V2); supports accurate voltage tracking even with interconnect resistance in high-current packs. |
| V2 | Cell 2 positive sense input | Differential input (V2–V1); designed for direct connection to cell terminals with minimal trace length. |
| V1 | Cell 1 positive sense input | Differential input (V1–VSS); references lowest cell to system ground (VSS), establishing stack baseline. |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must be routed directly to CELL– with low-inductance path. |
| OUT | Overvoltage fault output | CMOS active-high signal; drives high (≈VDD) when OV detected, compatible with standard logic inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Per-cell independent monitoring | Five dedicated differential inputs (V1–V5) eliminate shared-reference errors and support flexible 2–5S configurations without redesign. |
| Fixed 1 s delay timer | Internally generated timing eliminates external RC components, reducing BOM count and improving temperature stability vs. discrete timers. |
| Customer Test Mode (CTM) | 15 ms fault detection delay activated by VDD > V5 +10 V - accelerates production-line OV verification without compromising final-system timing. |
| Functional safety documentation | TI provides FIT data, failure mode analysis, and safety manual - enabling ISO 26262 ASIL-B or IEC 61508 SIL-2 system integration. |
| Ultra-low leakage inputs | <100 nA per sense pin - maintains cell voltage integrity over months of standby, preventing imbalance-induced capacity loss. |
Applications
| Handheld Power Tools | eBike Battery Packs |
|---|---|
Use Scenario: Cordless drill/driver battery packs subject to rapid charge cycles and high discharge currents causing transient cell overvoltage. IC Role / Device Role / Timing Role: Primary overvoltage protector triggering disconnect FETs within 1 s of cell excursion beyond 4.225 V. Use Value: Prevents lithium plating and thermal runaway by enforcing strict 4.225 V ceiling with ±10 mV accuracy across temperature. |
Use Scenario: 36 V/48 V eBike battery modules where cell imbalance during regenerative braking risks individual cell overvoltage. IC Role / Device Role / Timing Role: Standalone OVP monitor interfacing with pack controller via CMOS-active-high OUT signal. Use Value: Enables reliable fault signaling without external level-shifting, leveraging 1 µA quiescent current for long-term storage safety. |
| Cordless Vacuum Cleaners | Light Electric Vehicles (eScooters) |
Use Scenario: High-power vacuum packs operating at 22–30 V with aggressive fast-charging algorithms that stress top cell voltage limits. IC Role / Device Role / Timing Role: Independent cell-level OVP supervisor feeding fault status to system MCU for immediate charge termination. Use Value: 0.05 V hysteresis ensures stable recovery after transient overvoltage, avoiding nuisance shutdowns during dynamic load changes. |
Use Scenario: Compact eScooter battery packs requiring space-constrained protection ICs with minimal external components. IC Role / Device Role / Timing Role: Integrated OVP solution in 3.0 × 4.0 mm QFN package, directly mounted on cell-module PCB near sense points. Use Value: Eliminates need for external delay capacitor and comparator, reducing layout area and component count versus discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ771802DPJR | Same 4.225 V OVP threshold and 1 s delay, but offered in both DPJ (QFN) and DGK (MSOP) packages. | Identical electrical behavior; DGK variant allows through-hole or leaded assembly where reflow is impractical. | Select BQ771802DPJR only if MSOP packaging or alternate tape-and-reel format (DGKR/DGKT) is required. |
| BQ771818DPJR | Higher 4.300 V OVP threshold and same 1 s delay; otherwise identical pinout, package, and features. | Suitable for Li-ion chemistries with higher nominal voltage or relaxed safety margins (e.g., LCO vs. NMC). | Choose BQ771818DPJR when system-level validation confirms 4.300 V threshold meets cell voltage tolerance and aging requirements. |
Compared with BQ771811DPJR, BQ771802DPJR offers identical protection parameters with broader packaging flexibility, while BQ771818DPJR shifts the OVP threshold upward by 75 mV - enabling chemistry-specific tuning without changing board layout or firmware.
Availability
BQ771811DPJR is available at Aetrix Electronics and suitable for handheld power tools, e-bike battery packs, and cordless vacuum cleaners requiring stable component supply, long-lifecycle support, and automotive-grade reliability.
Supply support for BQ771811DPJR 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
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with deep expertise in battery management and functional safety architectures.
The BQ7718 family is designed specifically for cost-sensitive, high-volume Li-ion battery pack overvoltage protection - prioritizing accuracy, low power, and production-test efficiency in portable and light electric vehicle applications.
FAQ
What is the overvoltage protection threshold of the BQ771811DPJR?
The BQ771811DPJR has a fixed overvoltage protection threshold of 4.225 V per cell, with ±10 mV accuracy at 25°C and specified drift up to ±54 mV across –40°C to 110°C. This value is factory-trimmed and does not require external configuration - ensuring consistent trip points across production lots and temperature ranges for BQ771811DPJR-based designs.
Does the BQ771811DPJR support 2-cell, 3-cell, and 4-cell battery configurations?
Yes, the BQ771811DPJR supports 2-series to 5-series Li-ion battery configurations. Its five independent sense inputs (V1–V5) allow flexible use: for 2S, only V1 and V2 are connected; for 3S, V1–V3; for 4S, V1–V4; and for 5S, all five inputs. Unused inputs must be tied to appropriate potentials per TI's layout guidelines to maintain accuracy - a capability confirmed in the BQ771811DPJR datasheet Section 9.2.
What is the function of the OUT pin on the BQ771811DPJR?
The OUT pin on the BQ771811DPJR is a CMOS active-high output that transitions to VDD (logic high) when any monitored cell exceeds 4.225 V for the full 1 s delay period. During normal operation (no overvoltage), OUT remains at logic low. This direct-drive interface eliminates the need for external pull-up resistors and simplifies connection to microcontrollers or gate drivers - a verified behavior documented in BQ771811DPJR's DC Characteristics table and Functional Block Diagram.
How does the Customer Test Mode (CTM) work on the BQ771811DPJR?
Customer Test Mode on the BQ771811DPJR reduces the overvoltage delay from 1 s to 15 ms by applying VDD ≥ V5 + 10 V. This enables rapid production-line validation of OVP functionality without waiting for full delay timing. The mode exits automatically when the VDD-to-V5 differential drops below 10 V. CTM behavior is fully characterized and guaranteed per BQ771811DPJR's Section 8.4.3 and Figure 8-2.
Is the BQ771811DPJR suitable for functional safety applications?
Yes, the BQ771811DPJR is functional safety-capable: Texas Instruments provides documentation including FIT rate data, failure mode effects analysis (FMEA), and a functional safety manual to support ISO 26262 ASIL-B or IEC 61508 SIL-2 system certification. This safety evidence is explicitly listed in the BQ771811DPJR datasheet Features section and Section 12.1 - confirming its readiness for safety-critical battery protection roles.
BQ771811DPJR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 2 ~ 5
- Fault Protection:
- Over Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (3x4)
BQ771811DPJR FAQ
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Please submit a Request for Quotation (RFQ) for BQ771811DPJR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of BQ771811DPJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ771811DPJR is usually 5 days.
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Once your BQ771811DPJR 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 BQ771811DPJR?
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6.How does Aetrix verify that BQ771811DPJR is sourced from the original manufacturer or authorized distributors?
All BQ771811DPJR 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 BQ771811DPJR meets industry standards.
7.What is the process for return or replacement of BQ771811DPJR?
All BQ771811DPJR units undergo pre-shipment inspection (PSI). If there is an issue with BQ771811DPJR, 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 BQ771811DPJR part is unused and in its original packaging.
Return procedure for BQ771811DPJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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