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Texas Instruments BQ771803DPJR
- Part No.:
- BQ771803DPJR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
BQ771803DPJR.pdf
- Description:
- IC BATT PROT LI-ION 2-5CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,371
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Product details
Overview
BQ771803DPJR 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 NCH open-drain active-low output. It monitors each cell independently and supports handheld power tools and e-bike battery management systems.
For engineers reviewing the BQ771803DPJR datasheet, BQ771803DPJR pinout, BQ771803DPJR application, or BQ771803DPJR equivalent, key selection criteria include fixed 4.275 V overvoltage threshold, 0.05 V hysteresis, sub-1 µA quiescent current, and QFN-8 (3.0 × 4.0 mm) package compatibility with production-line Customer Test Mode (CTM) support.
Technical Context
The BQ771803DPJR implements independent per-cell voltage sensing using five differential inputs (V1–V5 relative to VSS), comparing each against a precision 4.275 V reference. Detection triggers a fixed 1 s delay timer before asserting the open-drain OUT pin low.
Its functional safety-capable architecture includes documented failure modes, FIT rate data, and diagnostic coverage guidance. The device operates across –40°C to 110°C with supply voltage range 3 V to 25 V and input leakage <100 nA per cell input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.275 V ±10 mV at 25°C - enables precise cell-level cutoff before electrolyte decomposition in Li-ion cells. |
| OV Hysteresis | 0.05 V - prevents chatter during marginal overvoltage recovery and ensures clean fault release. |
| Delay Timer | 1 s nominal - provides deterministic response window for external protection logic coordination. |
| Quiescent Current | ≈1 µA (VCELL(ALL) < VPROTECT) - minimizes standby drain in always-on battery packs. |
| Input Leakage | <100 nA per cell input - preserves cell balance and avoids measurement error in high-impedance stacks. |
| Output Type | NCH open-drain active-low - allows flexible pull-up to PACK+ or system rail for fault signaling. |
| Operating Temp | –40°C to 110°C - supports operation in power tool motor compartments and e-scooter battery enclosures. |
Pinout & Package
Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, exposed thermal pad, RoHS-compliant, moisture sensitivity 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 and ESD protection. |
| V5 | Cell voltage sense input | Sense positive terminal of topmost (5th) cell; requires series RIN and shunt CIN for noise filtering. |
| V4 | Cell voltage sense input | Sense positive terminal of 4th cell; identical RC filtering requirement as V5. |
| V3 | Cell voltage sense input | Sense positive terminal of 3rd cell; part of independent 5-channel differential monitoring chain. |
| V2 | Cell voltage sense input | Sense positive terminal of 2nd cell; enables full stack coverage for 2–5 series configurations. |
| V1 | Cell voltage sense input | Sense positive terminal of lowest (1st) cell; referenced to VSS, not ground - critical for floating stack topology. |
| VSS | Reference node | IC ground and connection to negative terminal of lowest cell - establishes common reference for all Vx inputs. |
| OUT | Fault signal output | NCH open-drain active-low output; requires external pull-up resistor to enable fault flag assertion to host controller. |
Key Features
| Feature | Design Value |
|---|---|
| Per-cell independent monitoring | Five dedicated differential inputs (V1–V5) allow true individual cell OVP detection without shared reference errors. |
| Customer Test Mode (CTM) | Reduces OV delay to ~15 ms for rapid production-line validation - eliminates need for long-duration stress testing. |
| Functional Safety-Capable | Includes FIT data, FMEA documentation, and diagnostic coverage guidance for ISO 26262 ASIL-B system integration. |
| Low-power precision sensing | ±10 mV OVP accuracy with <100 nA input leakage enables reliable protection in energy-constrained portable applications. |
| Thermal robustness | Rated for continuous operation up to 110°C ambient - suitable for battery packs adjacent to motors or power electronics. |
Applications
| Handheld Power Tools | eBike Battery Packs |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs with 3- or 4-series Li-ion cells subjected to high-current discharge and regenerative braking spikes. IC Role / Device Role / Timing Role: Standalone overvoltage monitor that asserts fault signal within 1 s of any cell exceeding 4.275 V, enabling pack-level disconnect before thermal runaway initiation. Use Value: Prevents field failures caused by charger overvoltage or cell imbalance during fast charging, extending pack service life and meeting UL 2271 requirements. |
Use Scenario: Mid-drive eBike battery modules where regenerative braking induces transient overvoltage on individual cells. IC Role / Device Role / Timing Role: Independent cell-level OVP detector with 1 s delay and 0.05 V hysteresis, interfacing directly with battery management microcontroller via open-drain OUT. Use Value: Enables safe, certified battery operation under dynamic load conditions while maintaining <1 µA standby current to preserve shelf life. |
| Cordless Vacuum Cleaners | Light Electric Scooters |
|
Use Scenario: High-power vacuum cleaner battery packs (4S/5S) experiencing voltage overshoot during abrupt motor stop events. IC Role / Device Role / Timing Role: Primary overvoltage protection element with fixed 4.275 V threshold and CTM support for factory end-of-line functional test. Use Value: Eliminates need for external timing components or microcontroller-based monitoring, reducing BOM cost and PCB area. |
Use Scenario: Compact scooter battery modules operating in urban environments with wide ambient temperature swings (–20°C to 50°C). IC Role / Device Role / Timing Role: Temperature-stable OVP supervisor (±44 mV drift over –40°C to 110°C) providing fail-safe cell protection without calibration. Use Value: Ensures consistent overvoltage response across environmental extremes, supporting UN 38.3 transport compliance and CE marking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ771801DPJR | Same 4.275 V OVP threshold and 0.05 V hysteresis, but 3 s delay timer instead of 1 s. | Suitable for applications requiring longer fault confirmation window, such as UPS backup systems with slower charge termination. | Select BQ771801DPJR only if extended delay improves system reliability; otherwise BQ771803DPJR's 1 s response better matches power tool transient profiles. |
| BQ771802DPJR | Lower 4.225 V OVP threshold and same 1 s delay, but 0.3 V hysteresis vs. 0.05 V. | Targeted at higher-safety-margin designs using lower-voltage Li-ion chemistries or aging-aware protection schemes. | Choose BQ771802DPJR when tighter voltage headroom or wider hysteresis is required; BQ771803DPJR offers optimal balance for standard NMC/NCA cells. |
Compared with BQ771801DPJR and BQ771802DPJR, the BQ771803DPJR delivers the fastest deterministic response (1 s) at the industry-standard 4.275 V threshold with minimal hysteresis - making it ideal for high-dynamic applications like cordless tools and e-mobility where rapid fault isolation is critical.
Availability
BQ771803DPJR is available at Aetrix Electronics and suitable for handheld power tools, e-bike battery packs, and cordless vacuum cleaners requiring stable component supply and automotive-grade temperature performance.
Supply support for BQ771803DPJR 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 delivering analog and embedded processing solutions, with leadership in battery management ICs and functional safety design resources.
The BQ7718 family is engineered specifically for standalone overvoltage protection in multi-cell Li-ion battery packs, emphasizing precision, ultra-low power, and production-test efficiency in portable and light electric vehicle applications.
FAQ
What is the overvoltage protection threshold and accuracy of the BQ771803DPJR?
The BQ771803DPJR has a fixed overvoltage protection threshold of 4.275 V with ±10 mV accuracy at 25°C and ±44 mV maximum drift over –40°C to 110°C. This specification ensures reliable cell-level cutoff before lithium plating occurs, and the tight tolerance supports compliance with IEC 62133 and UL 2271 battery safety standards. The BQ771803DPJR achieves this using an internal trimmed reference and matched comparator circuitry.
How does the Customer Test Mode (CTM) function in the BQ771803DPJR?
The BQ771803DPJR enters Customer Test Mode when VDD exceeds V5 by at least 10 V, reducing the overvoltage delay timer from 1 s to approximately 15 ms. This allows rapid functional verification during battery pack manufacturing without waiting for full delay cycles. The BQ771803DPJR exits CTM automatically when the VDD–V5 differential falls below 10 V, restoring normal 1 s timing behavior.
What package type and footprint does the BQ771803DPJR use?
The BQ771803DPJR uses an 8-pin WSON (DPJ) package measuring 3.00 mm × 4.00 mm with an exposed thermal pad. It is RoHS-compliant, moisture sensitivity level 1, and compatible with standard reflow profiles. The BQ771803DPJR shares footprint compatibility with other DPJ-packaged BQ7718 variants, enabling design reuse across OVP threshold options.
Does the BQ771803DPJR support 2-cell through 5-cell Li-ion battery configurations?
Yes, the BQ771803DPJR supports 2-, 3-, 4-, and 5-series Li-ion battery configurations via its five independent cell voltage inputs (V1–V5) and VSS reference. Unused inputs (e.g., V4 and V5 in a 2S pack) must be tied to appropriate potentials per TI design guidelines. The BQ771803DPJR performs real-time differential monitoring across all enabled cells without requiring external multiplexing or firmware intervention.
What is the output configuration and drive capability of the BQ771803DPJR?
The BQ771803DPJR features an NCH open-drain active-low output (OUT pin) capable of sinking up to 14 mA when asserted and leaking less than 100 nA when inactive. An external pull-up resistor to PACK+ or system rail is required. This configuration enables direct interface with microcontrollers, MOSFET gate drivers, or optocouplers for pack-level disconnect control. The BQ771803DPJR does not provide active-high drive capability.
BQ771803DPJR 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)
BQ771803DPJR FAQ
1.How can I place an order for BQ771803DPJR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ771803DPJR 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 BQ771803DPJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ771803DPJR is usually 5 days.
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Once your BQ771803DPJR 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 BQ771803DPJR?
For technical support, including BQ771803DPJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ771803DPJR requirements.
6.How does Aetrix verify that BQ771803DPJR is sourced from the original manufacturer or authorized distributors?
All BQ771803DPJR 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 BQ771803DPJR meets industry standards.
7.What is the process for return or replacement of BQ771803DPJR?
All BQ771803DPJR units undergo pre-shipment inspection (PSI). If there is an issue with BQ771803DPJR, 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 BQ771803DPJR part is unused and in its original packaging.
Return procedure for BQ771803DPJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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