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Texas Instruments BQ7720700DSSR
- Part No.:
- BQ7720700DSSR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
BQ7720700DSSR.pdf
- Description:
- 3-SERIES TO 7-SERIES CELL LI-ION
- Quantity:
- Payment:
- Shipping:
Inventory:2,934
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Product details
Overview
BQ7720700DSSR from Texas Instruments is a dedicated 3- to 7-series Li-ion battery protection IC that independently monitors cell voltage, open-wire connection, and temperature (via external NTC/PTC) with ±10 mV overvoltage accuracy at 25°C, 1 s fixed OVP delay, and active-high 6 V COUT/DOUT outputs - deployed in cordless power tools and e-bike battery packs for fail-safe pack-level shutdown.
For engineers reviewing the BQ7720700DSSR datasheet, BQ7720700DSSR pinout, BQ7720700DSSR application, or BQ7720700DSSR equivalent, this page delivers verified functional specifications, exact WSON-12 pin mapping, real-world fault response timing, thermal derating data, and validated alternative parts for production-grade battery management system (BMS) design.
Technical Context
The BQ7720700DSSR implements independent per-cell voltage sensing across seven inputs (V1–V7), with fixed internal delay timers (1 s OVP/UVP, 4 s OT/OW) and ratiometric TS-pin thermistor monitoring using a 20 kΩ internal pull-up. It triggers COUT on overvoltage or open-wire faults and DOUT on undervoltage, while both outputs activate simultaneously for overtemperature or open-wire events.
Its CMOS active-high output drive delivers 6 V logic-level signals capable of directly controlling external FET gate drivers or fuse control circuits, with 6.5 mA source current capability and <1 µA quiescent supply current under no-fault conditions - enabling ultra-low-power standby operation in sealed battery packs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.325 V ±10 mV at 25°C - sets precise cell overcharge cutoff for 3.7 V nominal Li-ion cells. |
| UVP Threshold | 2.25 V ±30 mV at 25°C - prevents deep discharge damage to Li-ion cells during high-load operation. |
| OVP Delay Time | 1 s - provides noise immunity against transient spikes without compromising safety response speed. |
| Supply Current (no fault) | ≈2–3.5 µA - enables multi-year shelf life and low self-discharge in always-on battery protection systems. |
| Output Drive Type | Active-high CMOS to 6 V - eliminates need for external level shifters when interfacing with 5 V logic or FET drivers. |
| Operating Temp Range | –40°C to +110°C - supports deployment in power tools and e-scooters exposed to ambient extremes. |
| Package | 12-pin WSON (DSS), 3 mm × 2 mm - surface-mount footprint compatible with automated PCB assembly and compact pack layouts. |
Pinout & Package
Package: 12-pin WSON (DSS), 3 mm × 2 mm, 0.5 mm lead pitch, exposed thermal pad (VSS-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated pack voltage input (5–38.5 V); powers internal regulator and sensing circuitry. |
| V1–V7 | Cell voltage sense inputs | Independent high-impedance inputs for monitoring each cell's positive terminal relative to VSS. |
| VSS | Ground reference | IC ground and connection to negative terminal of lowest cell; forms common reference for all Vn inputs. |
| COUT | Fault output (OVP/OW/OT) | Active-high 6 V CMOS output triggered on overvoltage, open-wire, or overtemperature faults. |
| DOUT | Fault output (UVP/OW/OT) | Active-high 6 V CMOS output triggered on undervoltage, open-wire, or overtemperature faults. |
| TS | Temperature sensor input | Ratiometric analog input for NTC/PTC thermistors; internally pulled up to ~20 kΩ for resistance-based OT detection. |
Key Features
| Feature | Design Value |
|---|---|
| Per-cell voltage monitoring | Seven independent inputs (V1–V7) enable direct stack monitoring without daisy-chain complexity or communication overhead. |
| Open-wire detection | 50 µA pulsed sink on each Vn input detects broken cell connections - critical for field-replaceable modular battery packs. |
| Fixed internal delay timers | Factory-programmed 1 s OVP/UVP and 4 s OT/OW delays eliminate external RC timing components and reduce BOM count. |
| Functional safety-capable | Includes oscillator health check and latch mode option - supports ISO 26262 ASIL-B readiness in automotive-adjacent applications. |
| Low leakage per cell input | <100 nA with open-wire disabled - minimizes parasitic drain on individual cells during long-term storage. |
Applications
| Handheld Power Tools | Cordless Vacuum Cleaners |
|---|---|
|
Use Scenario: High-current burst loads (e.g., motor stall, brush engagement) cause rapid cell voltage sag and localized heating in 5S/6S Li-ion packs. IC Role / Device Role / Timing Role: BQ7720700DSSR independently monitors each cell for UVP (2.25 V) and OT (70°C), triggering DOUT/COUT within 1 s to disable CHG/DSG FETs before thermal runaway. Use Value: Prevents irreversible capacity loss and fire risk by enforcing hard voltage/temperature limits without MCU intervention. |
Use Scenario: Repeated charge/discharge cycles in compact vacuum battery packs accelerate cell imbalance and interconnect fatigue. IC Role / Device Role / Timing Role: BQ7720700DSSR performs periodic open-wire checks (128 ms interval) and detects broken cell taps before pack failure during runtime. Use Value: Enables field-serviceable modules by halting operation upon open-wire fault - avoiding catastrophic pack disconnect under load. |
| eBike Battery Packs | UPS Backup Systems |
|
Use Scenario: Regenerative braking and hill-climbing induce sustained overvoltage on top cells in 7S eBike configurations. IC Role / Device Role / Timing Role: BQ7720700DSSR applies ±10 mV OVP accuracy at 25°C to detect 4.325 V excursions on V7, asserting COUT after 1 s to cut charging path. Use Value: Guarantees cell-level overcharge protection even when primary BMS controller is unresponsive or in sleep mode. |
Use Scenario: Long-duration float charging in UPS systems causes gradual electrolyte decomposition and gas buildup in Li-ion cells. IC Role / Device Role / Timing Role: BQ7720700DSSR continuously monitors V1–V7 for drift-induced overvoltage and uses TS pin with NTC to detect slow thermal rise (>70°C). Use Value: Adds autonomous, hardware-level safety layer that operates independently of firmware - meeting UL 1973 and IEC 62133 requirements. |
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 |
|---|---|---|---|
| BQ7720701DSSR | OVP = 4.275 V, UVP = 2.0 V - lower thresholds suited for LFP or high-cycle-count Li-ion chemistries. | Preferred for 2.0 V/cell cutoff in high-discharge-rate tools where deeper discharge extends runtime. | Select when tighter UVP margin is required and 4.275 V OVP aligns with cell chemistry voltage profile. |
| BQ7720704DSSR | OVP hysteresis = 0.05 V (vs. 0.100 V), COUT = open-drain, DOUT = active-high 6 V - asymmetric output configuration. | Enables flexible FET control architecture where COUT drives high-side switch and DOUT controls low-side discharge path. | Choose when discrete FET gate drive requires separate pull-up domains or mixed-signal output logic levels. |
Compared with BQ7720700DSSR, BQ7720701DSSR offers lower undervoltage threshold for extended runtime in high-power tools, while BQ7720704DSSR provides open-drain COUT for interoperability with legacy FET driver ICs - neither is pin-compatible, but all share identical WSON-12 packaging and thermal performance.
Availability
BQ7720700DSSR is available at Aetrix Electronics and suitable for handheld power tools, e-bike battery packs, and cordless vacuum cleaners requiring stable component supply, long-lifecycle support, and automotive-grade reliability validation.
Supply support for BQ7720700DSSR 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 experience in battery safety ICs.
The BQ77207 family is designed specifically for standalone, hardware-based protection in multi-cell Li-ion battery packs - prioritizing deterministic timing, fault isolation, and minimal external component count over programmability.
FAQ
What is the overvoltage protection threshold and accuracy of the BQ7720700DSSR?
The BQ7720700DSSR has a factory-programmed overvoltage protection (OVP) threshold of 4.325 V with ±10 mV accuracy at 25°C and ±20 mV accuracy across 0°C to 60°C. This precision ensures reliable cell overcharge prevention without false trips during transient voltage spikes, and is confirmed in TI's SLUSEG7D datasheet Section 6.5.
Does the BQ7720700DSSR support open-wire detection, and how does it function?
Yes, the BQ7720700DSSR supports open-wire detection on all V1–V7 inputs using a 50 µA pulsed sink every 128 ms. If a cell connection opens, the device detects Vn < Vn−1 − 200 mV, starts a 4 s timer, and asserts both COUT and DOUT. This feature is enabled by default and critical for detecting broken interconnects in modular battery packs.
What output drive configuration does the BQ7720700DSSR use for COUT and DOUT?
The BQ7720700DSSR uses active-high CMOS outputs for both COUT and DOUT, capable of driving to 6 V with 6.5 mA source current. This eliminates external level-shifting components when interfacing with 5 V logic or gate drivers - a key differentiator from open-drain alternatives like BQ7720704DSSR.
Can the BQ7720700DSSR monitor temperature, and what external components are required?
Yes, the BQ7720700DSSR monitors temperature via its TS pin using an external NTC or PTC thermistor. It includes a factory-trimmed 20 kΩ internal pull-up resistor, so only the thermistor and optional RC filter are needed - no external biasing circuitry. The device supports OT thresholds from 62°C to 83°C, with 70°C selected for BQ7720700DSSR.
What is the supply current consumption of the BQ7720700DSSR under normal operating conditions?
The BQ7720700DSSR draws approximately 2–3.5 µA of supply current (ICC) when no fault is present and all cell voltages remain within OVP/UVP limits. This ultra-low quiescent current enables multi-year battery shelf life and is measured per TI's SLUSEG7D datasheet Section 6.5 under recommended operating conditions (VDD = 5–38.5 V, TA = –40°C to +85°C).
BQ7720700DSSR 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)
BQ7720700DSSR FAQ
1.How can I place an order for BQ7720700DSSR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7720700DSSR 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 BQ7720700DSSR reliable?
The price and inventory of BQ7720700DSSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7720700DSSR is usually 5 days.
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Once your BQ7720700DSSR 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 BQ7720700DSSR?
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6.How does Aetrix verify that BQ7720700DSSR is sourced from the original manufacturer or authorized distributors?
All BQ7720700DSSR 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 BQ7720700DSSR meets industry standards.
7.What is the process for return or replacement of BQ7720700DSSR?
All BQ7720700DSSR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7720700DSSR, 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 BQ7720700DSSR part is unused and in its original packaging.
Return procedure for BQ7720700DSSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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