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Texas Instruments BQ771611DPJR
- Part No.:
- BQ771611DPJR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
BQ771611DPJR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,165
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Product details
Overview
BQ771611DPJR from Texas Instruments is a precision overvoltage protection IC for 2- to 4-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 4.35 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 e-bike battery management systems to prevent cell damage during charging.
For engineers reviewing the BQ771611DPJR datasheet, BQ771611DPJR pinout, BQ771611DPJR application, or BQ771611DPJR equivalent, key selection considerations include its 8-pin WSON package, low 1 µA quiescent current, <100 nA per-cell leakage, CD pin fault detection capability, and compatibility with 2S–4S configurations requiring high-accuracy, capacitor-tunable overvoltage response.
Technical Context
The BQ771611DPJR 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 4.35 V. Its CMOS active-high output asserts after the programmed delay unless hysteresis (300 mV) resets the condition.
It integrates CD pin timeout detection to force fault assertion on open/shorted delay capacitors, supports Customer Test Mode (<170 ms delay when CD is grounded), and operates across –40°C to +110°C with supply voltage from 3 V to 20 V - enabling robust deployment in power tools and light electric vehicles without external supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.35 V ±10 mV at 25°C - ensures precise cell-level overvoltage cutoff within tight safety margins for Li-ion chemistry. |
| OVP Hysteresis | 300 mV typical - prevents oscillation near threshold by requiring cell voltage to drop to 4.05 V before clearing fault. |
| Quiescent Current | ≈1 µA when all cells below VPROTECT - enables multi-year standby life in battery-powered backup systems. |
| Per-Cell Input Leakage | <100 nA - minimizes self-discharge impact on stacked cells and preserves state-of-charge accuracy. |
| Delay Timer Range | 1–2 s with 0.1 µF CD capacitor - provides configurable fault response time to accommodate charger dynamics and system latency. |
| Operating Temperature | –40°C to +110°C - supports under-hood and motor-adjacent placement in e-scooter and power tool battery packs. |
| Supply Voltage Range | 3 V to 20 V - accommodates full 2S–4S Li-ion pack voltages (6–16.8 V nominal) plus margin for transients. |
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 input (3–20 V); requires RC filter (RVD/CVD) for noise immunity in noisy battery environments. |
| V1 | Cell 1 positive sense input | Senses voltage across lowest cell (V1–VSS); requires RIN/CIN filter for EMI rejection and stable monitoring. |
| V2 | Cell 2 positive sense input | Senses voltage across second cell (V2–V1); must be connected even in 2S config - unused pins shorted per datasheet. |
| V3 | Cell 3 positive sense input | Senses voltage across third cell (V3–V2); functional in 3S/4S; tied to V2 in 2S per Figure 9-2. |
| V4 | Cell 4 positive sense input | Senses voltage across top cell (V4–V3); active only in 4S configuration; shorted to V3 in 3S per Figure 9-3. |
| VSS | Ground reference | IC ground and connection to negative terminal of lowest cell; forms common reference for all differential inputs. |
| CD | External delay capacitor terminal | Charges to 1.5 V then discharges to trigger OUT; includes open/short fault detection - no external bias required. |
| OUT | CMOS active-high fault output | Drives high (≥6 V at 100 µA) during OV; sinks 0.5–14 mA when inactive - interfaces directly with MCU GPIO or FET gate driver. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-cell monitoring | Four dedicated high-impedance inputs (V1–V4) enable true differential sensing without shared reference errors in stacked topologies. |
| Capacitor-programmable delay | Delay time scales linearly with CD capacitance (tCD = K × CCD, K = 10–20), allowing field-adjustable response without firmware change. |
| CD pin fault detection | Asserts OUT if CD pin fails to charge above 1.5 V or discharge to VSS - eliminates single-point failure risk from capacitor defects. |
| Customer Test Mode | Grounding CD reduces delay to ≤170 ms, accelerating production-line OV functional testing without compromising final design timing. |
| High-accuracy OVP | ±10 mV initial accuracy and ±54 mV worst-case drift over –40°C to +110°C ensures reliable protection across environmental extremes. |
Applications
| Power Tools | UPS Battery Backup |
|---|---|
Use Scenario: Cordless drill battery packs with 3S or 4S Li-ion stacks subjected to fast-charging and high-current discharge cycles. IC Role / Device Role / Timing Role: Standalone overvoltage monitor that independently validates each cell voltage during CC/CV charging phase and triggers immediate disconnect if >4.35 V. Use Value: Prevents thermal runaway by enforcing strict 4.35 V cutoff with ±10 mV accuracy - critical where charger tolerance and cell imbalance could otherwise exceed safe limits. |
Use Scenario: Rack-mounted UPS modules using 2S Li-ion for hold-up power, operating continuously at elevated ambient temperatures. IC Role / Device Role / Timing Role: Always-on protector that supervises cell balance during float charging and detects overvoltage due to aging or charger drift. Use Value: 1 µA quiescent current extends backup runtime; 110°C rating ensures reliability in sealed, fanless enclosures without derating. |
| eBike Battery Packs | Pedal Assist Bicycles |
Use Scenario: 36 V (10S) or 48 V (13S) e-bike battery packs with integrated BMS, where individual cell monitoring is delegated to front-end protectors like BQ771611DPJR. IC Role / Device Role / Timing Role: Primary overvoltage guard for 4-cell subsections - each BQ771611DPJR covers one quartet in modular pack architecture. Use Value: 300 mV hysteresis prevents nuisance tripping during regenerative braking voltage spikes while ensuring rapid recovery once transient subsides. |
Use Scenario: Compact, lightweight pedal-assist battery packs (2S–4S) with space-constrained PCB layouts and minimal thermal mass. IC Role / Device Role / Timing Role: Fault initiator that asserts CMOS-high signal to enable external load switch or alert microcontroller upon cell overvoltage. Use Value: 3.0 × 4.0 mm WSON footprint saves board area vs. SOIC alternatives; low leakage (<100 nA) avoids measurable capacity loss over months of storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ771600DPJR | 4.30 V OVP threshold, same 300 mV hysteresis and WSON-8 package | Used in 4.2 V nominal Li-ion systems requiring tighter upper limit than BQ771611DPJR's 4.35 V | Select when cell chemistry or charger profile mandates lower absolute OVP point; pinout and timing identical. |
| BQ771604DPJR | 4.20 V OVP threshold, same 50 mV hysteresis spec (min/max differs), identical package and interface | Targeted at high-precision 4.2 V standard Li-ion cells where 4.35 V would be unsafe | Choose for legacy 4.2 V chemistries; verify hysteresis behavior matches system recovery requirements - differs from BQ771611DPJR's 300 mV fixed value. |
Compared with BQ771600DPJR and BQ771604DPJR, the BQ771611DPJR offers the highest OVP threshold (4.35 V) in the family, making it optimal for newer high-voltage Li-ion variants while retaining identical timing control, package, and fault-detection architecture - simplifying redesign when upgrading cell chemistry.
Availability
BQ771611DPJR is available at Aetrix Electronics and suitable for power tools, e-bike battery packs, and UPS battery backup systems requiring stable component supply, long-lifecycle support, and guaranteed traceability for industrial OEM programs.
Supply support for BQ771611DPJR 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 BQ771611DPJR belongs to TI's BQ7716xy overvoltage protection family, designed specifically for cost-sensitive, high-reliability Li-ion battery packs in portable power equipment where accurate, capacitor-tunable cell-level protection is essential.
FAQ
What is the overvoltage protection threshold of the BQ771611DPJR?
The BQ771611DPJR has a fixed overvoltage protection threshold of 4.35 V with ±10 mV accuracy at 25°C. This value is factory-trimmed and remains stable across temperature, with worst-case drift of ±54 mV from –40°C to +110°C. The threshold applies independently to each monitored cell (V1–V4), and the device triggers after the external CD capacitor delay expires when any cell exceeds this level.
Does the BQ771611DPJR support 2-cell, 3-cell, and 4-cell Li-ion battery configurations?
Yes, the BQ771611DPJR supports 2-series, 3-series, and 4-series Li-ion battery configurations. For 2S operation, V3 and V4 are shorted to V2; for 3S, V4 is shorted to V3 - as specified in Figures 9-2 and 9-3 of the datasheet. All four sense inputs (V1–V4) are functional and must be properly terminated per configuration to ensure accurate differential measurement and avoid false faults.
How does the external delay capacitor (CD pin) work on the BQ771611DPJR?
The CD pin on the BQ771611DPJR connects to an external capacitor that sets the overvoltage delay time via tCD = K × CCD, where K ranges from 10 to 20. Upon OVP detection, the pin rapidly charges to 1.5 V, then discharges at a fixed rate; OUT asserts when voltage falls below threshold. The BQ771611DPJR also detects CD pin faults - if the capacitor is open or shorted, OUT activates immediately, ensuring fail-safe behavior.
What is the output drive type and capability of the BQ771611DPJR?
The BQ771611DPJR features a CMOS active-high output (OUT pin). When triggered, it drives high with ≥6 V at 100 µA sink load and can source up to 4.5 mA. When inactive, it pulls low to ≤400 mV at 100 µA. This eliminates need for external pull-up resistors and allows direct interfacing with MCU interrupt pins or logic-level FET gates without level-shifting circuitry.
What package and thermal characteristics does the BQ771611DPJR have?
The BQ771611DPJR uses 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. These values support operation up to +110°C ambient when mounted on standard FR-4 with adequate copper pour - validated for use in thermally demanding e-bike and power tool battery modules.
BQ771611DPJR 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)
BQ771611DPJR FAQ
1.How can I place an order for BQ771611DPJR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ771611DPJR 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 BQ771611DPJR reliable?
The price and inventory of BQ771611DPJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ771611DPJR is usually 5 days.
3.What payment methods are accepted for BQ771611DPJR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ771611DPJR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ771611DPJR?
BQ771611DPJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ771611DPJR 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 BQ771611DPJR?
For technical support, including BQ771611DPJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ771611DPJR requirements.
6.How does Aetrix verify that BQ771611DPJR is sourced from the original manufacturer or authorized distributors?
All BQ771611DPJR 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 BQ771611DPJR meets industry standards.
7.What is the process for return or replacement of BQ771611DPJR?
All BQ771611DPJR units undergo pre-shipment inspection (PSI). If there is an issue with BQ771611DPJR, 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 BQ771611DPJR part is unused and in its original packaging.
Return procedure for BQ771611DPJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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