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Texas Instruments BQ7720701DSSR
- Part No.:
- BQ7720701DSSR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
BQ7720701DSSR.pdf
- Description:
- 3-SERIES TO 7-SERIES CELL LI-ION
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
BQ7720701DSSR from Texas Instruments is a dedicated Li-ion battery protection IC for 3- to 7-series cell packs, providing independent overvoltage (4.275 V ±20 mV), undervoltage (2.0 V ±30 mV), open-wire, and overtemperature (80°C) detection with fixed 1-second delay timers and active-high 6-V COUT/DOUT outputs. It operates across –40°C to 110°C and consumes only ~3.5 µA in normal mode.
For engineers reviewing the BQ7720701DSSR datasheet, BQ7720701DSSR pinout, BQ7720701DSSR application, or BQ7720701DSSR equivalent, this page delivers verified technical context, exact pin functions, real-world protection timing behavior, thermal design guidance, and validated alternative options for battery pack safety architecture.
Technical Context
The BQ7720701DSSR implements independent per-cell voltage monitoring using precision analog comparators with factory-trimmed references, triggering fixed 1-s delay timers upon OVP/UVP/OW/OT fault detection. Its internal oscillator drives timing and supports Customer Test Mode (CTM) with 50-ms fault response for production-line validation.
It features dual fault outputs: COUT activates on overvoltage, open-wire, or overtemperature; DOUT activates on undervoltage, open-wire, or overtemperature. Both outputs are configured as active-high CMOS drivers capable of sourcing 6.5 mA at 6 V - enabling direct interface with external FET gate drivers or fuse control logic without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.275 V ±20 mV (0°C–60°C); enables precise cell balancing guardbanding against lithium plating |
| UVP Threshold | 2.0 V ±30 mV (–40°C–110°C); prevents deep discharge-induced copper dissolution in NMC/LCO cells |
| OT Threshold | 80°C with NTC thermistor; triggers dual-output shutdown before thermal runaway propagation begins |
| Delay Timer | Fixed 1 s for OVP/UVP/OW/OT; eliminates external RC timing component and improves BOM consistency |
| Supply Current | ~3.5 µA (no fault); ensures >10-year shelf life in stored battery packs with minimal self-discharge impact |
| Output Drive | COUT/DOUT active-high 6 V, 6.5 mA source capability; directly drives N-channel FET gates or logic-level fuses |
| Package | 12-pin WSON (DSS), 3 mm × 2 mm; supports high-density layout in compact power tool battery modules |
Pinout & Package
12-pin WSON (DSS) package, 3 mm × 2 mm footprint, 0.5 mm lead pitch, exposed thermal pad (VSS-connected). Designed for reflow-compatible assembly and low-inductance cell sensing paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Unregulated supply input | Accepts full stack voltage (5–38.5 V); powers internal regulator and sensing circuitry |
| V1–V7 | Cell voltage sense inputs | Independent high-impedance inputs (leakage <0.1 µA) for 7-series stacks; support random connection order |
| VSS | Ground reference | Electrically tied to bottom cell's negative terminal; serves as common reference for all Vx and outputs |
| COUT | Overvoltage/open-wire/OT output | Active-high CMOS output (6 V, 6.5 mA); asserts during OVP, OW, or OT faults to disable charge path |
| DOUT | Undervoltage/open-wire/OT output | Active-high CMOS output (6 V, 6.5 mA); asserts during UVP, OW, or OT faults to disable discharge path |
| TS | Temperature sensor input | Ratiometric NTC interface with internal 20 kΩ pull-up; detects 80°C threshold via external thermistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Per-cell independent monitoring | Enables reliable protection even with mismatched cells or partial pack failure - no shared reference dependency |
| Factory-trimmed OVP/UVP accuracy | ±20 mV over 0°C–60°C eliminates need for system-level calibration in handheld power tools |
| Customer Test Mode (CTM) | Reduces fault delay to 50 ms for automated EOL testing - cuts test time by >95% vs. standard 1-s timeout |
| Open-wire detection with 128-µs pulsed current | Identifies broken cell interconnects without DC loading - preserves pack voltage integrity during diagnostics |
| Functional safety-capable architecture | Includes oscillator health check and latch-free recovery; supports ISO 26262 ASIL-B decomposition in e-bike systems |
Applications
| Handheld Power Tools | Cordless Vacuum Cleaners |
|---|---|
Use Scenario: 5S Li-ion pack in 20V brushless drill subjected to rapid charge/discharge cycles and mechanical shock. IC Role / Device Role / Timing Role: Primary voltage and temperature protector; monitors each cell independently and asserts COUT/DOUT within 1 s of OVP/UVP/OT violation. Use Value: Prevents thermal runaway during stall-current events by cutting off charge/discharge before cell voltage exceeds 4.275 V or temperature reaches 80°C. |
Use Scenario: 6S battery in high-power cordless vacuum with frequent deep discharge and regenerative braking spikes. IC Role / Device Role / Timing Role: Standalone safety monitor co-located with pack; provides redundant UVP cutoff at 2.0 V to avoid copper dissolution during low-voltage motor surges. Use Value: Enables safe operation down to 2.0 V/cell while maintaining ±30 mV accuracy across –10°C to 60°C ambient - extending usable runtime without compromising longevity. |
| eBike Battery Packs | UPS Backup Systems |
Use Scenario: 7S 36V eBike battery exposed to outdoor temperature extremes and vibration-induced connector fatigue. IC Role / Device Role / Timing Role: Open-wire detector and overtemperature supervisor; uses TS pin with NTC to trigger dual-output shutdown at 80°C during hill-climb thermal stress. Use Value: Detects broken intercell welds via 128-µs pulsed current sensing - avoids false trips from transient noise while catching latent mechanical failures pre-failure. |
Use Scenario: 4S UPS module requiring fail-safe disconnect during grid outage with extended float charging. IC Role / Device Role / Timing Role: Secondary protection layer behind primary BMS; provides independent OVP verification at 4.275 V to prevent overcharge during AC charger regulation drift. Use Value: Adds deterministic 1-s delay before cutoff - eliminates nuisance tripping from brief voltage transients while guaranteeing shutdown before electrolyte decomposition begins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7720700DSSR | OVP = 4.325 V, UV = 2.25 V, OT = 70°C; same 1-s delay and active-high outputs | Better suited for higher-voltage NMC chemistries where tighter OVP margin is required | Select when cell OCV tolerance demands 4.325 V trip point and lower OT threshold improves thermal margin |
| BQ7720702DSSR | Same OVP/UVP/OT values as BQ7720701DSSR but with 2-s delay timer instead of 1 s | Preferred in applications with high transient voltage noise (e.g., motor commutation spikes) | Choose when system-level EMI requires longer debounce to avoid false OVP/UVP assertions |
Compared with BQ7720701DSSR, BQ7720700DSSR offers higher OVP setpoint and lower OT threshold for enhanced safety margin in aggressive charge profiles, while BQ7720702DSSR trades faster response for improved noise immunity via doubled delay - both retain identical pinout, package, and drive strength.
Availability
BQ7720701DSSR is available at Aetrix Electronics and suitable for handheld power tools, cordless vacuum cleaners, light electric vehicles, and UPS battery backup systems requiring stable component supply, long-lifecycle support, and automotive-grade reliability.
Supply support for BQ7720701DSSR 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 decades of expertise in battery management solutions.
The BQ77207 family is designed specifically for standalone, cost-optimized Li-ion battery pack protection - delivering precision voltage monitoring, robust thermal supervision, and production-test-friendly timing in ultra-small WSON packages.
FAQ
What is the overvoltage protection threshold and accuracy of the BQ7720701DSSR?
The BQ7720701DSSR has a fixed overvoltage protection threshold of 4.275 V with ±20 mV accuracy over 0°C to 60°C and ±50 mV over –40°C to 110°C. This value is factory-trimmed and non-adjustable, ensuring consistent cell-level protection without external resistor networks or calibration. The BQ7720701DSSR achieves this accuracy using internal bandgap-referenced comparators and matched transistor arrays.
How does the BQ7720701DSSR handle open-wire detection, and what is its impact on system design?
The BQ7720701DSSR performs open-wire detection by applying a 50-µA pulsed current to each Vx pin every 128 ms for 128 µs, measuring voltage drop to identify disconnected cells. This method avoids continuous DC loading that could disturb pack voltage. The BQ7720701DSSR requires no external components for OW detection and supports random cell connection order - simplifying assembly and reducing field failure risk in high-vibration applications like power tools.
Can the BQ7720701DSSR be used with both NTC and PTC thermistors for overtemperature protection?
Yes, the BQ7720701DSSR supports both NTC and PTC thermistors via its TS pin, which interfaces with an internal 20 kΩ pull-up resistor. For the 80°C overtemperature threshold, it expects an external NTC resistance of 2195 Ω (at 80°C) or a PTC resistance of 111.1 kΩ. The BQ7720701DSSR's ratiometric measurement rejects supply variation, and its ±5°C OT accuracy assumes ±2% thermistor tolerance - confirmed in TI's SLUSEG7D datasheet Section 6.5.
What is Customer Test Mode (CTM) in the BQ7720701DSSR, and how is it activated?
Customer Test Mode (CTM) reduces the BQ7720701DSSR's fault delay timer from 1 s to 50 ms for rapid end-of-line functional testing. It is activated by raising VDD to at least 12 V above V7 (e.g., V7 = 20 V → VDD ≥ 32 V), then held for >10 ms. The BQ7720701DSSR automatically exits CTM when the VDD–V7 differential drops below 10 V. This feature eliminates manual timer overrides and accelerates production test throughput without modifying hardware.
Does the BQ7720701DSSR support latch functionality, and how is recovery handled?
No, the BQ7720701DSSR does not include latch functionality - it uses auto-recovery behavior. When a fault condition clears (e.g., cell voltage returns within OVP/UVP thresholds or thermistor resistance rises above OT threshold), the BQ7720701DSSR deasserts COUT and DOUT after the delay timer expires. Recovery requires no power cycle or external reset signal, enabling seamless resumption of pack operation after transient faults - critical for consumer tools and vacuums.
BQ7720701DSSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 3 ~ 7
- Fault Protection:
- Over Temperature, Over/Under Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WSON (3x2)
BQ7720701DSSR FAQ
1.How can I place an order for BQ7720701DSSR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7720701DSSR 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 BQ7720701DSSR reliable?
The price and inventory of BQ7720701DSSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7720701DSSR is usually 5 days.
3.What payment methods are accepted for BQ7720701DSSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7720701DSSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7720701DSSR?
BQ7720701DSSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7720701DSSR 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 BQ7720701DSSR?
For technical support, including BQ7720701DSSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7720701DSSR requirements.
6.How does Aetrix verify that BQ7720701DSSR is sourced from the original manufacturer or authorized distributors?
All BQ7720701DSSR 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 BQ7720701DSSR meets industry standards.
7.What is the process for return or replacement of BQ7720701DSSR?
All BQ7720701DSSR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7720701DSSR, 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 BQ7720701DSSR part is unused and in its original packaging.
Return procedure for BQ7720701DSSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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