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Texas Instruments BQ771612DPJT
- Part No.:
- BQ771612DPJT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
BQ771612DPJT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,493
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Product details
Overview
BQ771612DPJT from Texas Instruments is a precision overvoltage protection IC for 2- to 4-series Li-ion battery packs, featuring fixed 3.90 V per-cell OVP threshold, ±10 mV accuracy at 25°C, external capacitor-programmed delay (1–2 s with 0.1 µF), and CMOS active-high output. It operates across –40°C to +110°C and supports power tools and e-bike battery management systems.
For engineers reviewing the BQ771612DPJT datasheet, BQ771612DPJT pinout, BQ771612DPJT application, or BQ771612DPJT equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, and confirmed alternative options for battery pack overvoltage monitoring in industrial and mobility applications.
Technical Context
The BQ771612DPJT independently monitors up to four cell voltages using dedicated analog inputs (V1–V4) referenced to VSS, triggering an overvoltage fault when any cell exceeds 3.90 V with 300 mV hysteresis. Its delay timer is implemented via external CD pin capacitor charging/discharging with built-in open/short fault detection.
It uses a CMOS active-high output driver capable of sourcing 4.5 mA and sinking 14 mA, powered by an unregulated 3–20 V VDD supply. Input leakage per cell sense pin is <100 nA, and quiescent current is ≈1 µA under normal operation-enabling long-term battery pack standby integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 3.90 V per cell - sets precise overvoltage trip point for Li-ion cells without trimming or calibration. |
| OVP Accuracy | ±10 mV at 25°C - ensures reliable cell voltage margin control within ±0.26% of nominal 3.90 V. |
| Hysteresis | 300 mV - prevents chatter during recovery by requiring cell voltage to drop to 3.60 V before clearing fault. |
| Delay Timer Range | 1–2 s with 0.1 µF CD capacitor - provides configurable response time for safe shutdown sequencing. |
| Supply Current | ≈1 µA (VCELL(ALL) < VPROTECT) - enables multi-year battery pack shelf life without significant drain. |
| Input Leakage | <100 nA per cell input - minimizes measurement error and avoids cell imbalance from parasitic current paths. |
| Operating Temp | –40°C to +110°C - supports deployment in harsh environments including motorized e-scooter battery enclosures. |
Pinout & Package
Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, exposed thermal pad, RoHS-compliant, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated 3–20 V supply rail; requires RC filter (RVD/CVD) for noise immunity in high-dV/dt battery systems. |
| V1 | Cell 1 positive sense input | Monitors voltage across lowest cell (Cell1); must be filtered with RIN/CIN to reject switching noise from motor drivers. |
| V2 | Cell 2 positive sense input | Monitors voltage across second cell (Cell2); shares same RIN/CIN design rules as V1 for matched filtering. |
| V3 | Cell 3 positive sense input | Monitors third cell in 3S/4S stacks; unused pins in 2S config must be shorted to adjacent Vx or VSS per TI layout guidance. |
| V4 | Cell 4 positive sense input | Enables full 4S support; tied to V3 in 3S, or to V2 in 2S configurations to maintain proper voltage reference chain. |
| VSS | Ground reference | IC ground and negative terminal of Cell1; must connect directly to battery pack's lowest potential point to avoid sensing offset. |
| CD | Delay capacitor interface | Charges to 1.5 V then discharges to trigger OUT; detects open/short faults on CCD to ensure fail-safe OVP response. |
| OUT | CMOS active-high fault output | Drives high (≥6 V) during OVP; sinks 14 mA when low - interfaces directly with microcontroller GPIO or external FET gate driver. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-cell monitoring | Four dedicated analog inputs (V1–V4) enable true series-string voltage tracking without shared reference errors. |
| Capacitor-programmed delay | External CD pin allows field-adjustable OVP response time (1–2 s typical) without firmware or resistor changes. |
| CD fault detection | Integrated timeout circuit triggers OUT even if CD capacitor is open or shorted - eliminates single-point failure risk. |
| Customer Test Mode | Shorting CD to VSS reduces delay to ≤170 ms for rapid production-line functional testing of OVP path. |
| Ultra-low leakage | <100 nA per cell input prevents cell self-discharge imbalance and preserves state-of-charge accuracy over months. |
Applications
| Power Tools | UPS Battery Backup |
|---|---|
|
Use Scenario: Cordless drill battery packs with 2S–4S Li-ion configurations subject to regenerative braking spikes and fast charge termination transients. IC Role / Device Role / Timing Role: Standalone hardware OVP monitor that acts before MCU-based protection, providing independent safety layer with sub-2-second response. Use Value: Prevents cell venting or thermal runaway during charger malfunction or motor controller fault by enforcing hard 3.90 V clamp with no software dependency. |
Use Scenario: Rack-mounted UPS systems using 4S Li-ion modules where long-term float voltage stability and infrequent fault events demand ultra-low ICC. IC Role / Device Role / Timing Role: Always-on cell-level overvoltage sentinel; draws only ~1 µA while continuously validating each cell voltage against 3.90 V threshold. Use Value: Extends backup runtime and calendar life by eliminating parasitic drain-induced imbalance and enabling decades-long maintenance-free operation. |
| eBike Battery Packs | Pedal Assist Bicycles |
|
Use Scenario: Sealed 3S or 4S battery packs mounted in eBike frames exposed to vibration, temperature cycling, and EMI from BLDC motor controllers. IC Role / Device Role / Timing Role: Primary hardware OVP guard with integrated CD fault detection - ensures fail-safe shutdown even if external timing capacitor degrades. Use Value: Meets EN 15194 functional safety requirements by delivering deterministic 3.90 V trip with ±10 mV accuracy and 300 mV hysteresis across –40°C to +110°C. |
Use Scenario: Compact 2S Li-ion packs for lightweight pedal-assist systems where PCB space is constrained and thermal management is passive. IC Role / Device Role / Timing Role: Space-optimized OVP supervisor in 3×4 mm WSON package; V3/V4 pins shorted to V2 in 2S mode per TI layout guidelines. Use Value: Enables Class I e-bike certification with minimal BOM count - no external comparators, references, or timers required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ771600DPJT | OVP threshold = 4.30 V, hysteresis = 300 mV - higher trip point suited for LCO or NMC cells with wider voltage range. | Used in power tools with 4.2 V/cell nominal chemistry; not suitable for 3.9 V LiFePO₄ or aged NMC packs. | Select BQ771600DPJT only when cell chemistry requires ≥4.3 V OVP; BQ771612DPJT is preferred for 3.9 V tolerance-critical designs. |
| BQ771611DPJT | OVP threshold = 4.35 V, hysteresis = 300 mV - highest trip point in family; identical pinout and delay architecture. | Targeted at high-voltage 4S e-scooter packs using silicon-anode or high-nickel NMC; incompatible with 3.9 V cutoff requirements. | Choose BQ771611DPJT for future-proofing with headroom above 4.2 V; BQ771612DPJT remains optimal for strict 3.90 V compliance. |
Compared with BQ771600DPJT and BQ771611DPJT, the BQ771612DPJT provides the only 3.90 V OVP option in the family - making it essential for LiFePO₄ compatibility, aging compensation, and safety margins in cost-sensitive mobility applications where overvoltage tolerance is tightly constrained.
Availability
BQ771612DPJT is available at Aetrix Electronics and suitable for power tools, UPS battery backup systems, and light electric vehicles requiring stable component supply, long-lifecycle assurance, and automotive-grade temperature performance.
Supply support for BQ771612DPJT 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 specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in battery management solutions.
The BQ7716 family was designed specifically for standalone, low-power, hardware-based overvoltage protection in multi-cell Li-ion battery packs - prioritizing accuracy, fault resilience, and ease of integration over programmability.
FAQ
What is the exact overvoltage protection threshold of the BQ771612DPJT?
The BQ771612DPJT has a fixed overvoltage protection threshold of 3.90 V per cell, specified with ±10 mV accuracy at 25°C and ±54 mV maximum drift over –40°C to +110°C. This value is factory-trimmed and non-adjustable, ensuring consistent trip behavior across production lots without external calibration components.
Does the BQ771612DPJT support 2-cell, 3-cell, and 4-cell battery configurations?
Yes, the BQ771612DPJT supports 2S, 3S, and 4S Li-ion configurations via its four independent cell sense inputs (V1–V4). For 2S use, V3 and V4 are shorted to V2 and V3 respectively per TI layout guidance; for 3S, V4 is shorted to V3. All configurations retain full OVP functionality with identical 3.90 V threshold per monitored cell.
How does the external delay capacitor affect BQ771612DPJT timing behavior?
The BQ771612DPJT uses the CD pin to connect an external capacitor (CCD) that sets the overvoltage delay time via tCD = K × CCD, where K = 10–20. With a 0.1 µF capacitor, delay ranges from 1 s (min) to 2 s (max). The CD circuit also detects open/short faults and forces immediate OUT activation - ensuring deterministic response regardless of capacitor health.
What is the output drive capability of the BQ771612DPJT OUT pin?
The BQ771612DPJT features a CMOS active-high output capable of sourcing 4.5 mA (IOH) and sinking 14 mA (IOL) at VDD = 14.4 V. When active, OUT drives to ≥6 V; when inactive, it pulls to ≤400 mV. This allows direct interfacing with MCU GPIOs, optocouplers, or gate drivers without level-shifting or buffering.
Is the BQ771612DPJT compatible with LiFePO₄ battery chemistries?
Yes, the BQ771612DPJT's 3.90 V OVP threshold is well-matched to LiFePO₄ cells, which typically reach 3.65 V nominal and 3.8–3.85 V fully charged. Its ±10 mV accuracy and 300 mV hysteresis provide robust margin against false trips during transient load conditions while preventing overcharge damage in long-life energy storage applications.
BQ771612DPJT 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)
BQ771612DPJT FAQ
1.How can I place an order for BQ771612DPJT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ771612DPJT 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 BQ771612DPJT reliable?
The price and inventory of BQ771612DPJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ771612DPJT is usually 5 days.
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4.How is shipping managed for BQ771612DPJT?
BQ771612DPJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ771612DPJT 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 BQ771612DPJT?
For technical support, including BQ771612DPJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ771612DPJT requirements.
6.How does Aetrix verify that BQ771612DPJT is sourced from the original manufacturer or authorized distributors?
All BQ771612DPJT 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 BQ771612DPJT meets industry standards.
7.What is the process for return or replacement of BQ771612DPJT?
All BQ771612DPJT units undergo pre-shipment inspection (PSI). If there is an issue with BQ771612DPJT, 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 BQ771612DPJT part is unused and in its original packaging.
Return procedure for BQ771612DPJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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