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Texas Instruments BQ771611DPJT
- Part No.:
- BQ771611DPJT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
BQ771611DPJT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:922
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Product details
Overview
BQ771611DPJT 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 timer (1–2 s with 0.1 µF). It monitors each cell independently and drives a CMOS active-high fault signal, used in eBike battery management systems to prevent cell damage during charging.
For engineers reviewing the BQ771611DPJT datasheet, BQ771611DPJT pinout, BQ771611DPJT application, or BQ771611DPJT equivalent, key selection criteria include its 8-pin WSON package, low 1 µA quiescent current, <100 nA per-cell input leakage, CD pin fault detection capability, and compatibility with 2S–4S configurations requiring high-accuracy, capacitor-tunable OVP response.
Technical Context
The BQ771611DPJT implements independent per-cell voltage sensing using precision analog comparators referenced to a trimmed internal bandgap. Its delay timer operates via controlled charge/discharge of an external capacitor on the CD pin-charging to 1.5 V at 300 µA, then discharging at 100 nA-ensuring deterministic timing and open/shorted capacitor fault detection.
In OVERVOLTAGE mode, any cell exceeding 4.35 V triggers the timer; upon CD pin discharge below threshold, the CMOS-active-high OUT pin drives to VDD – 0.3 V (min) with 4.5 mA source capability. In NORMAL mode, OUT remains low while consuming only ~1 µA total supply current across –40°C to +110°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.35 V ±10 mV at 25°C - enables precise cell-level cutoff before electrolyte decomposition in high-voltage Li-ion cells. |
| OVP Hysteresis | 300 mV (typ) - prevents output chatter near threshold during transient voltage recovery. |
| Supply Current | ≈1 µA (VCELL(ALL) < VPROTECT) - supports ultra-low-power always-on monitoring in battery-backed 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 safety response time without firmware or external logic. |
| Output Drive | CMOS active-high, 4.5 mA source, VDD – 0.3 V min - directly interfaces with MCU GPIO or latch circuits without pull-up resistors. |
| Operating Temp | –40°C to +110°C - validated for under-hood and motor-adjacent placement in power tools and eScooters. |
Pinout & Package
Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, exposed thermal pad, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated 3–20 V supply; requires RC filter (RVD/CVD) for noise immunity in noisy battery environments. |
| V1–V4 | Cell voltage sense inputs | Differential inputs for cell1–cell4 positive terminals; each requires dedicated RIN/CIN filter (1 kΩ/0.1 µF nominal) for stable measurement. |
| VSS | Ground reference | IC ground and connection point to negative terminal of lowest cell; forms common reference for all Vx inputs. |
| OUT | Fault signal output | CMOS active-high output; drives high during OVP after delay; sinks <400 mV when low; no external pull-up required. |
| CD | Delay capacitor interface | Connects to external timing capacitor; includes built-in charge/discharge circuit and open/short fault detection logic. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-cell OVP monitoring | Each of up to four cells is compared separately to 4.35 V threshold-enables accurate protection even with cell imbalance. |
| Capacitor-programmable delay timer | Delay set by external CCD (0.1–1 µF); eliminates need for microcontroller-based timing or trimming resistors. |
| CD pin fault detection | Automatically detects open or shorted CD capacitor and asserts OUT-ensures fail-safe behavior regardless of external component failure. |
| Customer Test Mode | Shorting CD to VSS reduces OVP delay to ≤170 ms-accelerates production-line functional testing without compromising safety margins. |
| Ultra-low quiescent current | ~1 µA supply current during normal operation-extends shelf life and runtime of always-connected battery packs. |
Applications
| Power Tools | UPS Battery Backup |
|---|---|
Use Scenario: Cordless drill battery packs with 3-series or 4-series Li-ion cells subjected to rapid charging and high-current discharge cycles. IC Role / Device Role / Timing Role: Standalone overvoltage monitor that independently checks each cell and asserts fault signal after programmable delay to prevent thermal runaway. Use Value: Eliminates reliance on host MCU for cell-level OVP, reducing firmware complexity and enabling faster, deterministic shutdown than software-based solutions. |
Use Scenario: Rack-mounted UPS systems using 2-series Li-ion modules where long-term reliability and zero-maintenance operation are critical. IC Role / Device Role / Timing Role: Hardware-enforced overvoltage guardrail that activates only when cell voltage exceeds 4.35 V for ≥1 second-rejecting brief transients while ensuring sustained overvoltage is blocked. Use Value: Prevents electrolyte degradation and gas generation in sealed UPS cells, extending service life beyond 500 cycles without recalibration. |
| eBike Battery Packs | Pedal Assist Bicycles |
Use Scenario: Integrated 4-series eBike battery packs operating in ambient temperatures from –20°C to +65°C with frequent regenerative braking events. IC Role / Device Role / Timing Role: Primary hardware OVP layer that works in parallel with BMS MCU; senses individual cell voltages and triggers latchable shutdown via CMOS-high output. Use Value: Maintains ±10 mV OVP accuracy across temperature, avoiding false trips during regen spikes while guaranteeing protection at end-of-charge. |
Use Scenario: Compact pedal-assist battery modules where PCB space is constrained and passive component count must be minimized. IC Role / Device Role / Timing Role: Single-chip OVP solution replacing discrete comparator + timer designs; uses one external capacitor (CCD) instead of multiple timing resistors and capacitors. Use Value: Reduces bill-of-materials by 4+ components and saves >12 mm² PCB area versus discrete alternatives, with no compromise in timing accuracy or fault coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ771600DPJT | 4.30 V OVP threshold, 300 mV hysteresis, same package and pinout | Suitable for standard 4.2 V/cell Li-ion chemistry; less margin for high-voltage NMC variants | Select when protecting conventional 4.2 V nominal cells where tighter OVP margin is acceptable. |
| BQ771612DPJT | 3.90 V OVP threshold, 300 mV hysteresis, identical timing and leakage specs | Targeted at LFP or low-voltage Li-ion chemistries requiring lower trip point | Choose for LiFePO₄ packs or legacy 3.65 V/cell systems where 4.35 V would cause premature cutoff. |
Compared with BQ771600DPJT and BQ771612DPJT, the BQ771611DPJT provides the highest OVP threshold (4.35 V) in the family-making it optimal for next-generation high-voltage NMC and NMCA cells-while retaining identical low-power operation, CD fault detection, and WSON-8 footprint for drop-in replacement within the BQ7716xy series.
Availability
BQ771611DPJT is available at Aetrix Electronics and suitable for power tools, UPS battery backup, and light electric vehicles requiring stable component supply, long-lifecycle support, and automotive-grade temperature performance.
Supply support for BQ771611DPJT 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 BQ771611DPJT belongs to TI's BQ7716xy family of standalone overvoltage protection devices, designed specifically for cost-sensitive, high-reliability Li-ion battery packs in consumer and industrial mobility applications.
FAQ
What is the overvoltage protection threshold of the BQ771611DPJT?
The BQ771611DPJT has a fixed overvoltage protection threshold of 4.35 V per cell, with ±10 mV accuracy at 25°C and drift of ±54 mV maximum across –40°C to +110°C. This value is factory-trimmed and does not require external resistor programming. The BQ771611DPJT is intended for high-voltage NMC/NMCA Li-ion cells where 4.35 V represents the safe upper limit before electrolyte oxidation begins.
How does the BQ771611DPJT implement delay timing, and what capacitor value is recommended?
The BQ771611DPJT uses an external capacitor on the CD pin to set the overvoltage delay: tCD ≈ K × CCD, where K = 10–20 s/µF. With a 0.1 µF capacitor, the delay ranges from 1 s to 2 s. The BQ771611DPJT internally charges the CD pin to 1.5 V at 300 µA, then discharges it at 100 nA-ensuring predictable timing and detecting open/short faults. No external resistor is needed.
Is the BQ771611DPJT compatible with 2-cell, 3-cell, and 4-cell Li-ion battery configurations?
Yes, the BQ771611DPJT supports 2-series to 4-series Li-ion configurations. Unused Vx pins (e.g., V4 and V3 in a 2S setup) must be shorted to the adjacent lower cell's positive terminal per TI's layout guidance. All configurations use the same 8-pin WSON package and share identical electrical characteristics-including 4.35 V OVP, 1 µA quiescent current, and CD-based timing-making the BQ771611DPJT scalable across pack architectures.
Does the BQ771611DPJT require external pull-up resistors on the OUT pin?
No, the BQ771611DPJT features a CMOS active-high output driver capable of sourcing 4.5 mA and driving to VDD – 0.3 V minimum. Unlike open-drain variants, it does not require an external pull-up resistor. This simplifies design, reduces component count, and ensures deterministic logic levels without dependency on external biasing-critical for direct interfacing with MCU interrupt inputs in the BQ771611DPJT application.
What is the purpose of Customer Test Mode in the BQ771611DPJT, and how is it activated?
Customer Test Mode reduces the BQ771611DPJT's overvoltage delay from seconds to ≤170 ms by shorting the CD pin to VSS, enabling rapid functional verification during manufacturing. This mode leverages the internal CD charging delay (tCHGDELAY) rather than full capacitor discharge. Activation requires no configuration bits or external signals-only physical connection-and is safe as long as absolute maximum ratings are observed during test.
BQ771611DPJT 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)
BQ771611DPJT FAQ
1.How can I place an order for BQ771611DPJT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ771611DPJT 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 BQ771611DPJT reliable?
The price and inventory of BQ771611DPJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ771611DPJT is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ771611DPJT transactions.
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4.How is shipping managed for BQ771611DPJT?
BQ771611DPJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ771611DPJT 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 BQ771611DPJT?
For technical support, including BQ771611DPJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ771611DPJT requirements.
6.How does Aetrix verify that BQ771611DPJT is sourced from the original manufacturer or authorized distributors?
All BQ771611DPJT 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 BQ771611DPJT meets industry standards.
7.What is the process for return or replacement of BQ771611DPJT?
All BQ771611DPJT units undergo pre-shipment inspection (PSI). If there is an issue with BQ771611DPJT, 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 BQ771611DPJT part is unused and in its original packaging.
Return procedure for BQ771611DPJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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