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Texas Instruments BQ771605DPJR
- Part No.:
- BQ771605DPJR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
BQ771605DPJR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,596
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Product details
Overview
BQ771605DPJR from Texas Instruments is a precision overvoltage protection IC for 2- to 4-series Li-ion battery packs, featuring fixed 3.85 V OVP threshold, ±10 mV accuracy at 25°C, external capacitor-programmed delay (1–2 s with 0.1 µF), and N-channel open-drain active-low output. It operates across –40°C to +110°C and supports eBike and power tool battery management systems.
For engineers reviewing the BQ771605DPJR datasheet, BQ771605DPJR pinout, BQ771605DPJR application, or BQ771605DPJR equivalent, this page delivers verified technical context, real-world timing behavior, cell-level sensing architecture, supply current specs under operating conditions, and validated alternative options for battery pack OVP design.
Technical Context
The BQ771605DPJR independently monitors up to four differential cell voltages (V1–VSS through V4–V3) using internal high-accuracy comparators referenced to a 3.85 V OVP threshold with 250 mV hysteresis. Upon any cell exceeding VOV, it initiates a CD-pin-based delay timer that charges then discharges an external capacitor before asserting the active-low OUT signal.
This device implements timeout detection on the CD pin to ensure fault response even with open or shorted delay capacitors. Its NCH open-drain output requires an external pull-up resistor and sinks ≥0.5 mA during overvoltage, while consuming only ~1 µA in normal operation with <100 nA per-cell input leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 3.85 V ±10 mV at 25°C - sets precise overvoltage trip point for each monitored cell |
| OVP Hysteresis | 250 mV - prevents chatter near threshold by requiring cell voltage to drop to 3.60 V before recovery |
| Delay Timer Range | 1–2 s with 0.1 µF CD capacitor - enables configurable fault response time via external component |
| Supply Current | ≈1 µA when all cells below VOV - minimizes standby power drain in battery-powered systems |
| Input Leakage | <100 nA per Vx pin - preserves cell voltage integrity and avoids measurement error in high-impedance stacks |
| Output Type | NCH open-drain active-low - allows flexible interface with external pull-up and system-level fault signaling |
| Operating Temp | –40°C to +110°C - supports industrial and automotive-grade battery applications including eScooter packs |
Pinout & Package
Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, wettable flank, RoHS-compliant, MSL 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 |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must connect directly to pack minus |
| V1 | Cell 1 sense input | Differential input for positive terminal of bottom cell (V1–VSS) |
| V2 | Cell 2 sense input | Differential input for positive terminal of second cell (V2–V1) |
| V3 | Cell 3 sense input | Differential input for positive terminal of third cell (V3–V2); unused in 2S/3S configs |
| V4 | Cell 4 sense input | Differential input for positive terminal of top cell (V4–V3); unused in 2S/3S configs |
| CD | Delay capacitor interface | Charges to 1.5 V then discharges to trigger OUT; detects open/short faults |
| OUT | Fault signal output | N-channel open-drain active-low; requires external pull-up to PACK+ for logic-level signaling |
Key Features
| Feature | Design Value |
|---|---|
| Independent cell monitoring | Four differential inputs (V1–VSS to V4–V3) enable true per-cell OVP without shared reference errors |
| Capacitor-programmable delay | External CD capacitor sets 1–2 s delay (0.1 µF typical); supports production test mode with ≤170 ms response |
| CD fault detection | Integrated timeout circuit triggers OUT if CD pin fails to charge or discharge - ensures fail-safe operation |
| Ultra-low quiescent current | ~1 µA ICC in normal mode extends battery shelf life and reduces self-discharge impact in storage |
| High-accuracy OVP | ±10 mV tolerance at 25°C and ±54 mV over full temperature range ensures reliable cell protection |
Applications
| Power Tools | eBike Battery Packs |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs with 2–4 series Li-ion cells subject to fast charge termination and load transients. IC Role / Device Role / Timing Role: Standalone overvoltage monitor that asserts fault signal only after confirmed cell overvoltage and programmable delay. Use Value: Prevents cell damage from charger overshoot or regenerative braking spikes while avoiding nuisance trips via 250 mV hysteresis and capacitor-timed response. |
Use Scenario: Mid-drive eBike battery modules where thermal stress and voltage imbalance increase OVP risk during hill climbs. IC Role / Device Role / Timing Role: Per-cell voltage supervisor with independent sensing and open-drain fault output tied to BMS microcontroller interrupt line. Use Value: Enables safe shutdown before cell venting by detecting single-cell overvoltage at 3.85 V with ±10 mV accuracy, even at 110°C ambient. |
| UPS Backup Systems | Light Electric Vehicles (eScooters) |
|
Use Scenario: Rack-mounted UPS battery strings using 3S Li-ion configurations for data center backup power. IC Role / Device Role / Timing Role: Primary OVP layer protecting against AC-to-DC converter regulation failure or BMS communication loss. Use Value: Delivers fail-safe response with CD fault detection - triggers OUT even if external capacitor is missing or shorted during overvoltage event. |
Use Scenario: Compact eScooter battery packs with space-constrained 2S or 3S layouts and aggressive charge profiles. IC Role / Device Role / Timing Role: Low-leakage (≤100 nA/cell) voltage monitor enabling long-term storage without significant capacity loss. Use Value: Maintains cell balance integrity during 6-month shelf life while providing accurate 3.85 V OVP with minimal PCB footprint (3×4 mm WSON). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ771602DPJR | Same package and pinout; identical 4.225 V OVP threshold but only 50 mV hysteresis | Designed for tighter voltage windows (e.g., high-energy NMC cells), less tolerant of transient spikes | Select when higher OVP threshold and lower hysteresis suit cell chemistry and system margin |
| BQ771604DPJR | Same package and pinout; 4.20 V OVP threshold, CMOS active-high output, 50 mV hysteresis | Requires no external pull-up; incompatible with existing NCH open-drain fault bus architectures | Choose for new designs needing active-high signaling and simplified output stage, not drop-in replacement |
Compared with BQ771605DPJR, BQ771602DPJR offers higher OVP setpoint and reduced hysteresis for precision NMC chemistries, while BQ771604DPJR provides active-high output but lacks the 250 mV hysteresis needed for robust operation in noisy eScooter environments.
Availability
BQ771605DPJR is available at Aetrix Electronics and suitable for power tools, eBike battery packs, and light electric vehicle applications requiring stable component supply, long-lifecycle support, and guaranteed traceability for ISO 9001-certified production.
Supply support for BQ771605DPJR 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 signal chain solutions.
The BQ7716 family is designed specifically for standalone overvoltage protection in multi-cell Li-ion battery packs, targeting cost-sensitive, high-reliability applications like portable power equipment and light EVs where precision, low power, and fault resilience are critical.
FAQ
What is the overvoltage protection threshold of the BQ771605DPJR?
The BQ771605DPJR has a fixed overvoltage protection threshold of 3.85 V per cell, with ±10 mV accuracy at 25°C and ±54 mV maximum deviation across –40°C to +110°C. This value is factory-trimmed and non-adjustable, making BQ771605DPJR suitable for applications requiring consistent, repeatable cell-level protection without external calibration.
How does the external delay capacitor affect BQ771605DPJR timing behavior?
The external capacitor on the CD pin sets the overvoltage delay time for BQ771605DPJR: tCD = K × CCD, where K ranges from 10 to 20. With a typical 0.1 µF capacitor, the delay is 1–2 seconds. The BQ771605DPJR also detects CD pin faults - if the capacitor is open or shorted, the device still triggers the OUT pin within ≤170 ms to ensure fail-safe response.
Does the BQ771605DPJR support 2-cell, 3-cell, and 4-cell battery configurations?
Yes, the BQ771605DPJR supports 2-, 3-, and 4-series Li-ion battery configurations. Unused Vx pins (e.g., V4 in a 2S setup) must be shorted to the adjacent lower-sense node as specified in the datasheet. All configurations use the same 8-pin WSON package and share identical OVP threshold, hysteresis, and timing characteristics.
What is the output configuration of the BQ771605DPJR and how should it be interfaced?
The BQ771605DPJR features an N-channel open-drain active-low output (OUT pin). It must be externally pulled up to PACK+ or another logic-compatible rail using a resistor (typically 100 kΩ). During overvoltage, the OUT pin sinks ≥0.5 mA to signal fault; in normal operation, it presents high impedance - enabling wired-OR fault bus architectures in multi-IC systems.
What are the key thermal and packaging specifications for the BQ771605DPJR?
The BQ771605DPJR uses an 8-pin WSON (DPJ) package measuring 3.00 mm × 4.00 mm with wettable flanks. Its junction-to-board thermal resistance (RθJB) is 30.6°C/W, and it operates from –40°C to +110°C ambient. The device is RoHS-compliant, MSL Level-1 rated, and shipped in large tape-and-reel (3000 pcs) format for automated assembly.
BQ771605DPJR 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)
BQ771605DPJR FAQ
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The price and inventory of BQ771605DPJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ771605DPJR is usually 5 days.
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Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
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6.How does Aetrix verify that BQ771605DPJR is sourced from the original manufacturer or authorized distributors?
All BQ771605DPJR 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 BQ771605DPJR meets industry standards.
7.What is the process for return or replacement of BQ771605DPJR?
All BQ771605DPJR units undergo pre-shipment inspection (PSI). If there is an issue with BQ771605DPJR, 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 BQ771605DPJR part is unused and in its original packaging.
Return procedure for BQ771605DPJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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