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Texas Instruments BQ771808DPJT
- Part No.:
- BQ771808DPJT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
BQ771808DPJT.pdf
- Description:
- IC BATT PROT LI-ION 2-5CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:914
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Product details
Overview
BQ771808DPJT from Texas Instruments is a dedicated overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 4.200 V fixed overvoltage threshold, 1 s internal delay timer, and N-channel open-drain active-low output. It operates across –40°C to 110°C and supports handheld power tools and e-bike battery management systems.
For engineers reviewing the BQ771808DPJT datasheet, BQ771808DPJT pinout, BQ771808DPJT application, or BQ771808DPJT equivalent, key selection criteria include cell count compatibility (2–5S), OVP hysteresis (50 mV max), ultra-low quiescent current (≈1 µA), and QFN-8 (3.00 mm × 4.00 mm) package constraints for compact pack integration.
Technical Context
The BQ771808DPJT independently monitors up to five cell voltages using differential sensing inputs (V1–V5 relative to VSS) and triggers an overvoltage fault after a fixed 1 s delay upon detection of any cell exceeding 4.200 V. Its NCH open-drain OUT pin requires an external pull-up and asserts low during OV events.
Functional Safety-Capable design includes documentation support for ISO 26262 and IEC 61508 system-level analysis. The device uses internal reference trimming and operates with supply voltage from 3 V to 25 V while maintaining <100 nA per-cell input leakage and ±10 mV OVP accuracy at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.200 V - precise fixed trip point for Li-ion cell overvoltage detection |
| OVP Accuracy | ±10 mV at 25°C - ensures tight voltage margin control without calibration |
| OV Hysteresis | 50 mV max - prevents chatter during recovery near threshold |
| Delay Timer | 1 s nominal - fixed internal timing before OUT assertion, no external capacitor required |
| Supply Current | ≈1 µA when all cells below VPROTECT - enables multi-year battery pack shelf life |
| Input Leakage | <100 nA per cell input - minimizes self-discharge impact on stacked cells |
| Operating Temp | –40°C to 110°C - supports industrial and light EV environments |
Pinout & Package
Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, wettable flank, RoHS-compliant, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated 3–25 V supply; requires RC filter (RVD/CVD) for noise immunity |
| V5 | Cell voltage sense input | Sense positive terminal of topmost (5th) cell in stack; high-impedance input |
| V4 | Cell voltage sense input | Sense positive terminal of 4th cell; supports 2–5S configurations via unused pin floating |
| V3 | Cell voltage sense input | Sense positive terminal of 3rd cell; each Vx pin monitors differential voltage vs. adjacent lower node |
| V2 | Cell voltage sense input | Sense positive terminal of 2nd cell; referenced to V1, not ground |
| V1 | Cell voltage sense input | Sense positive terminal of lowest (1st) cell; referenced to VSS |
| VSS | Ground reference | IC ground and negative terminal of bottom cell; must connect directly to PACK– |
| OUT | Fault signal output | N-channel open-drain active-low; requires external pull-up to PACK+ or regulated rail |
Key Features
| Feature | Design Value |
|---|---|
| 2–5-series cell scalability | Single IC supports variable stack sizes by floating unused Vx pins - reduces BOM count across product families |
| Customer Test Mode (CTM) | Reduces OV delay to ~15 ms during production testing - accelerates functional verification without hardware change |
| Functional Safety-Capable | Documentation available for ISO 26262 ASIL-B and IEC 61508 SIL-2 system integration - enables safety-certified battery designs |
| Ultra-low power operation | 1 µA typical ICC below VPROTECT - extends shelf life and reduces thermal load in sealed packs |
| High-accuracy OVP | ±10 mV tolerance at 25°C with <54 mV drift over –40°C to 110°C - maintains safe voltage margins across temperature |
Applications
| Handheld Power Tools | eBike Battery Packs |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs with 2–5S Li-ion stacks subjected to high-current charge/discharge cycles and mechanical shock. IC Role / Device Role / Timing Role: Primary overvoltage monitor that independently validates each cell voltage and asserts fault within 1 s of violation. Use Value: Prevents cell venting or thermal runaway by enforcing strict 4.200 V ceiling with ±10 mV precision, even under transient load conditions. |
Use Scenario: Mid-drive eBike battery modules requiring robust protection against regenerative braking overvoltage spikes and charger miscommunication. IC Role / Device Role / Timing Role: Standalone OVP supervisor interfacing with pack controller via open-drain OUT signal; immune to common-mode noise on stacked sense lines. Use Value: Enables fail-safe shutdown with 1 s delay - long enough to ignore brief transients, short enough to prevent permanent cell damage. |
| Cordless Vacuum Cleaners | Light Electric Scooters |
|
Use Scenario: High-power vacuum cleaner batteries operating at 3S–5S with aggressive fast-charging profiles and frequent deep discharge. IC Role / Device Role / Timing Role: Independent cell-level OVP detector feeding into pack protection FET control logic; OUT drives external MOSFET gate driver. Use Value: Maintains <100 nA per-cell leakage - avoids measurable capacity loss over 2-year shelf life while enabling accurate voltage monitoring. |
Use Scenario: Compact scooter battery packs constrained by volume and weight, requiring minimal component count and zero external timing components. IC Role / Device Role / Timing Role: Integrated OVP solution with fixed 1 s delay - eliminates need for external RC timing network and associated layout sensitivity. Use Value: Reduces bill-of-materials by one timing capacitor and resistor pair versus discrete timer solutions, improving manufacturing yield. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ771801DPJT | 4.275 V OVP threshold, same 1 s delay, identical NCH open-drain output | Higher trip point better suited for higher-voltage Li-ion chemistries (e.g., LiCoO₂ with 4.275 V max) | Select BQ771801DPJT if cell chemistry requires tighter margin above 4.200 V; otherwise BQ771808DPJT provides optimal headroom for standard 4.2 V cells. |
| BQ771803DPJT | Same 4.275 V OVP and 1 s delay but with 50 mV hysteresis - identical electrical behavior to BQ771801DPJT | No functional distinction from BQ771801DPJT; TI lists both as orderable variants with same specs | BQ771803DPJT is a second-source variant of BQ771801DPJT; choose based on distributor availability - no design change required. |
Compared with BQ771801DPJT and BQ771803DPJT, the BQ771808DPJT offers a lower 4.200 V OVP threshold optimized for conservative protection of standard Li-ion cells, while retaining identical timing, output drive, and thermal performance - making it the preferred choice where tighter voltage ceilings are mandated by cell vendor specifications or safety standards.
Availability
BQ771808DPJT is available at Aetrix Electronics and suitable for handheld power tools, e-bike battery packs, and cordless vacuum cleaners requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for BQ771808DPJT 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 company specializing in analog and embedded processing technologies, with leadership in battery management, power conversion, and industrial signal chain solutions.
The BQ7718 family is designed specifically for cost-sensitive, high-reliability Li-ion battery overvoltage protection in consumer and light electric vehicle applications - emphasizing simplicity, accuracy, and functional safety readiness.
FAQ
What is the overvoltage protection threshold of the BQ771808DPJT?
The BQ771808DPJT has a fixed overvoltage protection threshold of 4.200 V per cell, with ±10 mV accuracy at 25°C and guaranteed maximum hysteresis of 50 mV. This value is factory-trimmed and does not require external configuration. The BQ771808DPJT maintains this specification across its full operating temperature range of –40°C to 110°C, supporting reliable protection in demanding environments like power tools and e-bikes.
Does the BQ771808DPJT require external timing components for its overvoltage delay?
No, the BQ771808DPJT features an internal fixed 1 s delay timer - no external capacitor or resistor is needed. This eliminates timing component variation, PCB layout sensitivity, and BOM cost. The BQ771808DPJT achieves consistent response time across units and temperature, unlike solutions requiring external RC networks. Customer Test Mode further reduces delay to ~15 ms for production verification without hardware modification.
How does the BQ771808DPJT interface with the host battery management system?
The BQ771808DPJT interfaces via its open-drain N-channel active-low OUT pin, which requires an external pull-up resistor to PACK+ or a regulated rail. When an overvoltage condition is detected, OUT pulls low to signal fault; otherwise, it remains high-impedance. The BQ771808DPJT does not communicate digitally - it serves as a hardwired safety monitor independent of MCU control, ensuring fail-safe operation even if the main BMS fails.
What package type and dimensions does the BQ771808DPJT use?
The BQ771808DPJT uses the DPJ package: an 8-pin WSON (very thin quad flat no-lead) measuring 3.00 mm × 4.00 mm with wettable flanks for automated optical inspection. It is RoHS-compliant, MSL Level-1 rated, and designed for reflow soldering. The BQ771808DPJT shares footprint compatibility with other BQ7718x DPJ variants, enabling design reuse across voltage-threshold options without layout changes.
Is the BQ771808DPJT suitable for functional safety–certified battery systems?
Yes, the BQ771808DPJT is Functional Safety-Capable, with documentation available to support ISO 26262 ASIL-B and IEC 61508 SIL-2 system-level development. This includes failure mode analysis, diagnostic coverage data, and safety mechanism descriptions. While the BQ771808DPJT itself is not pre-certified, its architecture and provided collateral enable integration into certified battery systems - a key differentiator versus non-safety-aware alternatives.
BQ771808DPJT 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)
BQ771808DPJT FAQ
1.How can I place an order for BQ771808DPJT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ771808DPJT 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 BQ771808DPJT reliable?
The price and inventory of BQ771808DPJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ771808DPJT is usually 5 days.
3.What payment methods are accepted for BQ771808DPJT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ771808DPJT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ771808DPJT?
BQ771808DPJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ771808DPJT 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 BQ771808DPJT?
For technical support, including BQ771808DPJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ771808DPJT requirements.
6.How does Aetrix verify that BQ771808DPJT is sourced from the original manufacturer or authorized distributors?
All BQ771808DPJT 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 BQ771808DPJT meets industry standards.
7.What is the process for return or replacement of BQ771808DPJT?
All BQ771808DPJT units undergo pre-shipment inspection (PSI). If there is an issue with BQ771808DPJT, 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 BQ771808DPJT part is unused and in its original packaging.
Return procedure for BQ771808DPJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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