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Texas Instruments BQ7720702DSSR
- Part No.:
- BQ7720702DSSR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
BQ7720702DSSR.pdf
- Description:
- 3-SERIES TO 7-SERIES CELL LI-ION
- Quantity:
- Payment:
- Shipping:
Inventory:2,478
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Product details
Overview
BQ7720702DSSR from Texas Instruments is a dedicated Li-ion battery cell voltage and temperature protection IC for 3- to 7-series battery packs, featuring ±10 mV overvoltage detection accuracy at 25°C, 4 s internal delay timer for overvoltage/undervoltage/open-wire/overtemperature faults, and active-high 6 V COUT/DOUT outputs. It is used in cordless power tools and e-bike battery management systems to prevent cell damage during charge/discharge cycles.
For engineers reviewing the BQ7720702DSSR datasheet, BQ7720702DSSR pinout, BQ7720702DSSR application, or BQ7720702DSSR equivalent, key selection considerations include its fixed 4 s fault delay, 4.275 V overvoltage threshold, 2.0 V undervoltage threshold, 80°C overtemperature trip point, and WSON-12 (DSS) package with 3 mm × 2 mm footprint.
Technical Context
The BQ7720702DSSR implements independent per-cell voltage monitoring across up to seven series-connected Li-ion cells, with dedicated comparators for overvoltage (OVP), undervoltage (UVP), and open-wire (OW) detection. Its internal delay timer initiates on fault detection and triggers COUT for OVP/OW/OT and DOUT for UVP/OW/OT after expiration.
Temperature protection uses an NTC thermistor connected to the TS pin, with ratiometric sensing against an internal 20 kΩ pull-up; overtemperature is detected when external resistance falls below 2195 Ω (corresponding to 80°C). The device supports Customer Test Mode (CTM) with 50 ms fault delay for production-line validation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.275 V - fixed trip point for cell overvoltage protection, enabling safe termination of charging before cell degradation. |
| UVP Threshold | 2.0 V - fixed undervoltage cutoff to prevent deep discharge and irreversible capacity loss in Li-ion cells. |
| OV Accuracy | ±10 mV at 25°C - ensures precise cell voltage regulation without requiring external calibration. |
| Fault Delay | 4 s - configurable internal timer prevents nuisance tripping during transient voltage excursions. |
| OT Trip Point | 80°C - fixed overtemperature threshold using NTC thermistor, protecting against thermal runaway. |
| Supply Current | ≈3.5 µA (no fault) - ultra-low quiescent current extends battery pack standby life. |
| Package | 12-pin WSON (DSS), 3 mm × 2 mm - surface-mount footprint compatible with high-density battery pack PCB layouts. |
Pinout & Package
Package: 12-pin WSON (DSS), 3 mm × 2 mm, 0.5 mm lead pitch, exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated input tied to top of battery stack (up to 38.5 V); powers internal regulator and logic. |
| V7–V1 | Cell voltage sense inputs | Differential inputs monitoring positive terminals of cells 1–7; support random connection order. |
| VSS | Reference ground | Electrically connected to negative terminal of lowest cell; serves as common reference for all sense inputs. |
| COUT | Overvoltage fault output | Active-high 6 V CMOS output triggered on OVP, OW, or OT; drives external FET gate or fuse control. |
| DOUT | Undervoltage fault output | Active-high 6 V CMOS output triggered on UVP, OW, or OT; enables independent discharge cutoff control. |
| TS | Temperature sensor input | Analog input for NTC thermistor; internally biased with 20 kΩ pull-up for ratiometric OT detection. |
Key Features
| Feature | Design Value |
|---|---|
| Random cell connection | Eliminates strict cell attachment sequence requirement, simplifying battery pack assembly and reducing manufacturing defects. |
| Open-wire detection | Identifies broken interconnects between cells using 50 µA pulsed sink current, preventing false voltage readings and unsafe operation. |
| Customer Test Mode (CTM) | Reduces fault delay to 50 ms for rapid production-line functional verification without modifying hardware. |
| Functional safety-capable | Includes oscillator health check and internal diagnostics supporting ISO 26262 ASIL-B system-level compliance. |
| Low leakage per cell input | <100 nA (OW disabled) - minimizes self-discharge impact on battery pack shelf life and state-of-charge accuracy. |
Applications
| Handheld Power Tools | Cordless Vacuum Cleaners |
|---|---|
|
Use Scenario: High-current discharge during motor startup and sustained operation causes rapid cell voltage sag and localized heating. IC Role / Device Role / Timing Role: BQ7720702DSSR continuously monitors individual cell voltages and temperature, triggering COUT/DOUT within 4 s if any cell exceeds 4.275 V or drops below 2.0 V, or if NTC indicates >80°C. Use Value: Prevents permanent cell damage and thermal runaway while maintaining tool runtime by enabling precise, per-cell protection without oversizing the pack. |
Use Scenario: Frequent charge/discharge cycles and variable load profiles cause uneven cell aging and voltage drift across the 5-series Li-ion pack. IC Role / Device Role / Timing Role: BQ7720702DSSR independently validates each cell's voltage and detects open-wire faults between cells, ensuring no single weak cell compromises entire pack integrity. Use Value: Extends product service life by isolating failing cells early and enabling field-replaceable module design instead of full pack replacement. |
| eBike Battery Packs | UPS Battery Backup Systems |
|
Use Scenario: Regenerative braking and hill-climbing generate high-voltage transients and heat buildup in 7-series battery strings. IC Role / Device Role / Timing Role: BQ7720702DSSR uses its 4 s delay and ±10 mV OVP accuracy to distinguish between benign transients and dangerous overvoltage events, avoiding unnecessary shutdowns. Use Value: Improves ride continuity and user experience while meeting UL 2580 and IEC 62133 safety certification requirements for electric mobility. |
Use Scenario: Long-term float charging and infrequent discharge cycles accelerate cell imbalance and increase risk of thermal failure in standby mode. IC Role / Device Role / Timing Role: BQ7720702DSSR operates at ≈3.5 µA quiescent current and performs periodic open-wire checks, detecting interconnect degradation before catastrophic failure. Use Value: Enables predictive maintenance alerts and reduces unplanned downtime in critical infrastructure applications. |
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 |
|---|---|---|---|
| BQ7720704DSSR | Same package and OVP/UVP thresholds, but COUT = open-drain active-pulldown, DOUT = active-high 6 V; 83°C OT trip. | Suitable for designs requiring asymmetric output drive (e.g., COUT controlling P-FET, DOUT driving MCU interrupt). | Select when mixed-output polarity is needed for legacy FET driver compatibility or specific fault isolation schemes. |
| BQ7720701DSSR | Same package and output drive, but 1 s OVP/UVP delay and 2.0 V UVP (identical), 80°C OT (identical), 4.275 V OVP (identical). | Better suited for applications needing faster response to overvoltage events, such as high-power fast-charging systems. | Choose when 4 s delay is too conservative and system-level fault tolerance allows shorter timing margins. |
Compared with BQ7720702DSSR, BQ7720704DSSR offers flexible output polarity at the cost of reduced OT margin (83°C vs. 80°C), while BQ7720701DSSR trades delay robustness for responsiveness-both require revalidation of fault-handling firmware and FET gate drive timing.
Availability
BQ7720702DSSR is available at Aetrix Electronics and suitable for handheld power tools, e-bike battery packs, cordless vacuum cleaners, and UPS backup systems requiring stable component supply, long-lifecycle support, and automotive-grade reliability.
Supply support for BQ7720702DSSR 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 BQ77207 family is designed specifically for standalone, high-accuracy voltage and temperature protection in multi-cell Li-ion battery packs-targeting cost-sensitive, safety-critical portable and light electric vehicle applications.
FAQ
What is the overvoltage protection threshold of the BQ7720702DSSR?
The BQ7720702DSSR has a fixed overvoltage protection (OVP) threshold of 4.275 V per cell, with ±10 mV accuracy at 25°C. This value is factory-programmed and cannot be adjusted externally. It applies to all seven cell inputs (V1–V7) and triggers the COUT pin after the 4 s internal delay timer expires if any monitored cell exceeds this level.
Does the BQ7720702DSSR support both NTC and PTC thermistors for temperature monitoring?
Yes, the BQ7720702DSSR supports both NTC and PTC thermistors via the TS pin. For NTC, it uses an internal 20 kΩ pull-up resistor and detects overtemperature when external resistance falls below 2195 Ω (80°C). For PTC, the required external resistance is 111.1 kΩ. The device does not auto-detect thermistor type-selection is made during part ordering and configuration.
How does the open-wire detection function work on the BQ7720702DSSR?
The BQ7720702DSSR applies a 50 µA pulsed sink current to each Vx pin every 128 ms for 128 µs. If Vn < Vn−1 − 200 mV (or V1 − VSS < 500 mV), an open-wire condition is flagged. After the 4 s delay timer expires, both COUT and DOUT go active. Recovery requires restoring the physical connection and clearing all other active faults.
Can the BQ7720702DSSR be used in a 3-cell battery pack?
Yes, the BQ7720702DSSR supports 3- to 7-series Li-ion configurations. Unused Vx pins (e.g., V4–V7 in a 3-cell pack) must be connected to VSS. The device automatically adapts its monitoring window and does not require external configuration changes-only correct physical wiring per the simplified schematic in the datasheet.
What is the purpose of Customer Test Mode (CTM) in the BQ7720702DSSR?
Customer Test Mode (CTM) reduces the fault delay timer from 4 s to 50 ms, enabling rapid functional validation during battery pack manufacturing. CTM is activated by applying VDD ≥ V7 + 12 V (minimum 13 V differential). It is intended solely for production testing and must not be used in end-equipment operation due to safety implications.
BQ7720702DSSR 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)
BQ7720702DSSR FAQ
1.How can I place an order for BQ7720702DSSR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7720702DSSR 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 BQ7720702DSSR reliable?
The price and inventory of BQ7720702DSSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7720702DSSR is usually 5 days.
3.What payment methods are accepted for BQ7720702DSSR?
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4.How is shipping managed for BQ7720702DSSR?
BQ7720702DSSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7720702DSSR 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 BQ7720702DSSR?
For technical support, including BQ7720702DSSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7720702DSSR requirements.
6.How does Aetrix verify that BQ7720702DSSR is sourced from the original manufacturer or authorized distributors?
All BQ7720702DSSR 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 BQ7720702DSSR meets industry standards.
7.What is the process for return or replacement of BQ7720702DSSR?
All BQ7720702DSSR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7720702DSSR, 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 BQ7720702DSSR part is unused and in its original packaging.
Return procedure for BQ7720702DSSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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