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Texas Instruments BQ771604DPJR
- Part No.:
- BQ771604DPJR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
BQ771604DPJR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,836
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Product details
Overview
BQ771604DPJR from Texas Instruments is a precision overvoltage protection IC for 2- to 4-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 4.200 V fixed overvoltage threshold, and external capacitor-programmed delay (1–2 s with 0.1 µF). It monitors each cell independently and drives a CMOS active-high fault signal, used in eBike and power tool battery management systems.
For engineers reviewing the BQ771604DPJR datasheet, BQ771604DPJR pinout, BQ771604DPJR application, or BQ771604DPJR equivalent, this device delivers high-accuracy cell-level overvoltage detection with integrated CD-pin fault detection, low 1 µA quiescent current, and WSON-8 packaging optimized for compact battery pack layouts.
Technical Context
The BQ771604DPJR implements independent per-cell voltage sensing using precision analog comparators referenced to a stable internal bandgap, triggering an external RC-based delay timer upon any cell exceeding 4.200 V. Its CMOS active-high output asserts after the programmed delay unless reset by cell voltage falling below (4.200 V – 50 mV) hysteresis.
It integrates CD-pin open/short fault detection: if the external capacitor fails to charge to 1.5 V or discharge to near VSS within defined timing windows, the OUT pin activates immediately-ensuring fail-safe response even with faulty timing components. The device operates across –40°C to +110°C with supply voltage from 3 V to 20 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.200 V ±10 mV at 25°C - enables precise cell voltage clamping without calibration. |
| OVP Hysteresis | 50 mV (typical) - prevents chatter during recovery near trip point. |
| Quiescent Current | ≈1 µA when all cells < VPROTECT - extends battery shelf life in storage. |
| Input Leakage | <100 nA per Vx pin - minimizes cell imbalance and self-discharge error. |
| Delay Timer Range | 1–2 s with 0.1 µF CD capacitor - configurable via external component for system-level fault response tuning. |
| Output Drive | CMOS active-high, VOUT = VDD – 0.3 V @ 100 µA - directly interfaces with MCU GPIO or latch without pull-up. |
| Operating Temp | –40°C to +110°C - supports under-hood and industrial battery environments. |
Pinout & Package
Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, exposed thermal pad, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated 3–20 V supply; requires RC filter (RVD/CVD) for noise immunity. |
| V1 | Cell 1 positive sense | Sense input for lowest cell; connects between Cell 1+ and VSS; requires RIN/CIN filter. |
| V2 | Cell 2 positive sense | Sense input for second cell; connects between Cell 2+ and Cell 1+; requires RIN/CIN filter. |
| V3 | Cell 3 positive sense | Sense input for third cell; connects between Cell 3+ and Cell 2+; unused in 2S config. |
| V4 | Cell 4 positive sense | Sense input for fourth cell; connects between Cell 4+ and Cell 3+; unused in 2S/3S configs. |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must be low-impedance return path. |
| CD | Delay capacitor interface | Connects to external timing capacitor; includes built-in charge/discharge and fault detection circuitry. |
| OUT | Overvoltage fault output | CMOS active-high signal; drives high (VDD – 0.3 V) during OV condition; no external pull-up required. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-cell monitoring | Four differential inputs (V1–VSS, V2–V1, V3–V2, V4–V3) enable true series-string voltage tracking without shared reference errors. |
| CD-pin fault detection | Detects open or shorted external delay capacitor and forces immediate OUT assertion - eliminates single-point failure risk. |
| Customer Test Mode | Shorting CD to VSS reduces OV delay to ≤170 ms - accelerates production-line functional testing without compromising safety. |
| High-accuracy OVP | ±10 mV initial accuracy and ±54 mV max drift over –40°C to +110°C ensures reliable protection across temperature extremes. |
| Ultra-low leakage | <100 nA per cell input minimizes inter-cell voltage imbalance and preserves state-of-charge accuracy during long-term storage. |
Applications
| Power Tools | eBike Battery Packs |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs with 2–4 Li-ion cells subjected to high-current charge/discharge cycles and mechanical shock. IC Role / Device Role / Timing Role: Standalone overvoltage monitor that triggers cutoff before cell degradation or thermal runaway occurs. Use Value: Prevents permanent capacity loss and fire hazard by enforcing strict 4.200 V/cell limit with 50 mV hysteresis and fail-safe CD-fault response. |
Use Scenario: Mid-drive eBike battery modules operating in ambient temperatures from –20°C to +60°C with frequent partial charging. IC Role / Device Role / Timing Role: Primary OVP guard in multi-cell stack, interfacing with host BMS via active-high fault flag. Use Value: Enables robust field operation with 1 µA quiescent current extending shelf life and ±10 mV accuracy maintaining tight voltage margins. |
| UPS Backup Systems | Light Electric Scooters |
|
Use Scenario: Rack-mounted 3S Li-ion UPS units requiring long-term reliability and zero false trips during grid fluctuations. IC Role / Device Role / Timing Role: Independent hardware-level OVP layer that operates regardless of MCU status or firmware integrity. Use Value: Guarantees fail-safe shutdown with CD-fault detection - no reliance on external timing components for critical protection. |
Use Scenario: Compact 36 V (10S) scooter battery packs where space-constrained 2S–4S submodules require discrete OVP per section. IC Role / Device Role / Timing Role: Modular overvoltage protector for segmented battery architecture, enabling scalable pack design. Use Value: Supports flexible 2S/3S/4S configurations with same footprint and pinout - simplifies BOM management across vehicle variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ771601DPJR | OVP threshold = 4.225 V, hysteresis = 50 mV - tighter voltage margin for higher-capacity NMC cells. | Used where cell chemistry requires slightly elevated OVP (e.g., high-voltage NMC). | Select when nominal cell OCV exceeds 4.200 V but remains below 4.225 V at full charge. |
| BQ771602DPJR | OVP threshold = 4.225 V, output = NCH open-drain active-low - requires external pull-up resistor. | Preferred in systems with legacy active-low fault signaling or wired-OR fault bus architectures. | Choose only if host system expects active-low logic and can accommodate pull-up design constraints. |
Compared with BQ771604DPJR, BQ771601DPJR offers a 25 mV higher OVP threshold for chemistries needing less conservative clamping, while BQ771602DPJR provides active-low output compatibility at the cost of added external components and reduced noise immunity on the fault line.
Availability
BQ771604DPJR is available at Aetrix Electronics and suitable for power tools, eBike battery packs, and UPS backup systems requiring stable component supply, long-lifecycle support, and automotive-grade temperature performance.
Supply support for BQ771604DPJR 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 precision analog ICs.
The BQ771604DPJR belongs to TI's BQ7716 family of standalone overvoltage protection ICs, designed specifically for cost-sensitive, space-constrained Li-ion battery packs requiring hardware-enforced cell voltage limits without MCU dependency.
FAQ
What is the exact overvoltage protection threshold for BQ771604DPJR?
The BQ771604DPJR has a fixed overvoltage protection threshold of 4.200 V ±10 mV at 25°C, with ±54 mV maximum accuracy drift across the full –40°C to +110°C operating range. This value is factory-trimmed and does not require external calibration. The BQ771604DPJR uses an internal precision reference to maintain stability against supply and temperature variation.
Does BQ771604DPJR support 2-cell, 3-cell, and 4-cell battery configurations?
Yes, the BQ771604DPJR supports 2-series, 3-series, and 4-series Li-ion battery configurations. Unused Vx pins (e.g., V3 and V4 in a 2S setup) must be shorted to the adjacent lower-potential node as specified in the datasheet's typical application schematics. All four sense inputs are internally isolated, enabling true differential monitoring per cell gap.
How is the overvoltage delay time set on BQ771604DPJR?
The BQ771604DPJR uses an external capacitor connected to the CD pin to set the overvoltage delay time. With a 0.1 µF capacitor, the delay ranges from 1 s to 2 s depending on process and temperature. The relationship follows tCD (s) = K × CCD (µF), where K = 10–20. The BQ771604DPJR also detects CD pin faults (open/short) and triggers immediate OUT assertion if the capacitor fails to charge or discharge properly.
What is the output type and drive capability of BQ771604DPJR?
The BQ771604DPJR features a CMOS active-high output. When triggered, OUT drives high to VDD – 0.3 V at 100 µA sink load; it sources up to 4.5 mA during overvoltage. No external pull-up is required. This differs from NCH open-drain variants (e.g., BQ771602DPJR), making the BQ771604DPJR ideal for direct MCU GPIO interfacing without additional passives.
What package and thermal characteristics does BQ771604DPJR use?
The BQ771604DPJR is housed in an 8-pin WSON (DPJ) package measuring 3.00 mm × 4.00 mm with an exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 56.6°C/W, and junction-to-board (RθJB) is 30.6°C/W. The device is rated for continuous operation from –40°C to +110°C ambient, with MSL Level-1 handling and lead-free (NiPdAu) finish compliant with RoHS.
BQ771604DPJR 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 ~ 4
- Fault Protection:
- Over Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (3x4)
BQ771604DPJR FAQ
1.How can I place an order for BQ771604DPJR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ771604DPJR 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 BQ771604DPJR reliable?
The price and inventory of BQ771604DPJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ771604DPJR is usually 5 days.
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Once your BQ771604DPJR 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 BQ771604DPJR?
For technical support, including BQ771604DPJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ771604DPJR requirements.
6.How does Aetrix verify that BQ771604DPJR is sourced from the original manufacturer or authorized distributors?
All BQ771604DPJR 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 BQ771604DPJR meets industry standards.
7.What is the process for return or replacement of BQ771604DPJR?
All BQ771604DPJR units undergo pre-shipment inspection (PSI). If there is an issue with BQ771604DPJR, 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 BQ771604DPJR part is unused and in its original packaging.
Return procedure for BQ771604DPJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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