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Texas Instruments BQ7721609PWR
- Part No.:
- BQ7721609PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7721609PWR.pdf
- Description:
- VOLTAGE AND TEMPERATURE PROTECTI
- Quantity:
- Payment:
- Shipping:
Inventory:1,962
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Product details
Overview
BQ7721609PWR from Texas Instruments is a fixed-threshold, 16-cell Li-ion battery voltage and temperature protection IC with integrated delay timers. It provides overvoltage protection (4.35 V ±20 mV), open-wire detection, overtemperature protection (83°C), and active-high 6V drive on COUT/DOUT - used in cordless power tools and e-bike battery packs to prevent cell damage during charge/discharge cycles.
For engineers reviewing the BQ7721609PWR datasheet, BQ7721609PWR pinout, BQ7721609PWR application, or BQ7721609PWR equivalent, this page delivers verified functional specifications, real-world use cases, validated alternative parts, and supply-chain support for industrial battery pack design and qualification.
Technical Context
The BQ7721609PWR implements independent per-cell voltage monitoring across 16 series-connected Li-ion cells using precision analog comparators with ±20 mV accuracy from 0°C to 60°C. Its internal delay timer (4 s for OVP/OW/OT) initiates upon fault detection and triggers COUT or DOUT outputs based on fault type and configuration.
It supports external NTC thermistor-based overtemperature detection via the TS pin with ratiometric sensing and internal 20 kΩ pullup; undervoltage protection is disabled per device configuration. Output drive is fixed as active-high with 6V capability on both COUT and DOUT, enabling direct interface to external FET gate drivers or fuse control circuits without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.35 V ±20 mV (0°C–60°C); enables precise high-voltage cutoff before cell degradation |
| OVP Delay | 4 s; prevents nuisance tripping during transient overvoltage events like load dump |
| OT Threshold | 83°C; fixed overtemperature trip point for thermal runaway prevention in high-power packs |
| Open-Wire Detection | Enabled; identifies broken interconnects between cells to avoid unbalanced charging |
| Supply Current | ≈1 µA (no fault); ultra-low quiescent current extends battery shelf life |
| Output Drive | Active-high, 6V capable on both COUT and DOUT; drives external FET gates directly |
| Cell Count Support | 3- to 16-series Li-ion stacks; accommodates common e-bike and power tool pack configurations |
Pinout & Package
Package: 24-pin TSSOP (PW), body size 4.40 mm × 7.80 mm, 0.65 mm lead pitch, leaded surface-mount format compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15, 16 | NC | No internal connection; must be left floating or tied to ground per layout best practice |
| 2 | VDD | Main power input (5–75 V); connects to top of battery stack; requires RC filter (RVD/CVD) |
| 3–20 | V16–V1 | Cell voltage sense inputs; monitor positive terminal of each cell from top (V16) to bottom (V1) |
| 21 | VSS | IC ground reference; electrically tied to negative terminal of lowest cell (V1–) |
| 22 | COUT | Active-high fault output (6V drive); asserted on OVP, OW, OT, or UT faults |
| 23 | DOUT | Active-high fault output (6V drive); asserted on OW, OT, or UT faults (UVP disabled) |
| 24 | TS | NTC thermistor input; ratiometric sensing with internal 20 kΩ pullup; requires <200 pF capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.35 V overvoltage threshold | Eliminates external resistor programming; ensures consistent OVP across production batches |
| 4-second internal delay timer | Reduces false triggering during brief voltage spikes while maintaining safety response time |
| Open-wire detection enabled | Verifies physical integrity of cell interconnects before enabling charge/discharge paths |
| 83°C overtemperature trip | Matches thermal limits of high-C-rate Li-ion cells used in power tools and e-scooters |
| Active-high 6V COUT/DOUT drive | Directly controls external high-side FETs or latching relays without external level shifters |
Applications
| Power Tool Battery Packs | e-Bike Battery Management |
|---|---|
Use Scenario: Cordless drill/driver battery packs with 10–16 series Li-ion cells operating at 36–60 V nominal. IC Role / Device Role / Timing Role: Primary voltage and temperature protector; monitors each cell independently and asserts COUT/DOUT to disable charge/discharge FETs within 4 s of OVP or OT fault. Use Value: Prevents cell venting or fire during fast charging or high-current discharge by enforcing strict 4.35 V/cell and 83°C limits. |
Use Scenario: Mid-drive e-bike battery packs subject to regenerative braking, high ambient temperatures, and vibration-induced interconnect fatigue. IC Role / Device Role / Timing Role: Fault supervisor detecting open-wire conditions and overtemperature during hill climbs or extended rides. Use Value: Ensures pack reliability under mechanical stress by identifying broken cell links before imbalance causes thermal runaway. |
| Cordless Vacuum Cleaner Packs | Light Electric Vehicle Backup Systems |
Use Scenario: High-power 12S–14S Li-ion packs powering brushless motor vacuums with peak currents >30 A. IC Role / Device Role / Timing Role: Overvoltage and open-wire monitor; uses fixed 4 s delay to tolerate brief voltage overshoot during motor commutation. Use Value: Maintains runtime integrity by avoiding premature shutdown while guaranteeing cell safety during sustained high-load operation. |
Use Scenario: Secondary backup battery systems in delivery scooters or micro-mobility platforms requiring fail-safe thermal shutdown. IC Role / Device Role / Timing Role: Standby-mode protector; draws only ~1 µA while continuously monitoring TS pin for 83°C threshold breach. Use Value: Extends shelf life and ensures readiness by combining ultra-low ICC with deterministic OT response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7721610PWR | Includes undervoltage protection (2.5 V, 2 s delay); same 83°C OT and 4 s delays for OVP/OW/OT | Required where low-voltage cutoff is needed to prevent deep discharge in high-drain applications | Select BQ7721610PWR if UVP is mandatory; otherwise BQ7721609PWR reduces system complexity with UVP disabled |
| BQ7721607PWR | Same 83°C OT and open-wire enable, but adds undertemperature protection (–30°C) and 0.1 V UV hysteresis | Suitable for sub-zero environment deployments (e.g., outdoor winter equipment) | Choose BQ7721607PWR only when UT detection is required; BQ7721609PWR simplifies design for temperate-climate tools |
Compared with BQ7721610PWR and BQ7721607PWR, the BQ7721609PWR offers the most streamlined protection set for applications where overvoltage, open-wire, and overtemperature are the sole critical failure modes - reducing external component count and eliminating UVP/UT configuration overhead.
Availability
BQ7721609PWR is available at Aetrix Electronics and suitable for cordless power tools, e-bike battery packs, and light electric vehicle backup systems requiring stable component supply, long-term lifecycle assurance, and TI-qualified automotive-grade reliability.
Supply support for BQ7721609PWR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and industrial-grade performance.
The BQ77216xx family is designed specifically for standalone, cost-sensitive Li-ion battery pack protection - targeting handheld power tools, e-mobility, and UPS applications where fixed-threshold, low-power, and robust fault signaling are essential.
FAQ
What is the overvoltage protection threshold and accuracy of the BQ7721609PWR?
The BQ7721609PWR has a fixed overvoltage protection threshold of 4.35 V per cell, with accuracy of ±10 mV at 25°C and ±20 mV across 0°C to 60°C. This specification is factory-trimmed and does not require external resistor networks, ensuring consistent OVP behavior across units and temperature ranges in the BQ7721609PWR.
Does the BQ7721609PWR support undervoltage protection?
No, the BQ7721609PWR has undervoltage protection disabled per its factory-programmed configuration. This is confirmed in Table 4-1 and Table 4-2 of the datasheet, where the UVP row shows "Disabled" for BQ7721609PWR. The BQ7721609PWR relies solely on overvoltage, open-wire, and overtemperature monitoring.
What is the function of the TS pin on the BQ7721609PWR?
The TS pin on the BQ7721609PWR is a ratiometric temperature sensor input that interfaces with an external NTC thermistor. It uses an internal 20 kΩ pullup resistor to generate a voltage proportional to thermistor resistance, enabling detection of overtemperature at 83°C. Capacitance on TS must remain below 200 pF to maintain measurement accuracy in the BQ7721609PWR.
How are the COUT and DOUT outputs configured on the BQ7721609PWR?
The BQ7721609PWR features active-high, 6V-capable drive on both COUT and DOUT pins - confirmed in Table 4-2. When triggered, these outputs drive to 6 V (not VDD) and can directly control external high-side FET gates or latching circuits without additional level-shifting components in the BQ7721609PWR design.
What package type and pin count does the BQ7721609PWR use?
The BQ7721609PWR uses a 24-pin TSSOP (PW) package with 0.65 mm lead pitch and nominal body dimensions of 4.40 mm × 7.80 mm. Pin functions include 16 cell voltage inputs (V1–V16), VDD, VSS, COUT, DOUT, TS, and three NC pins - all documented in Section 5 of the official BQ7721609PWR datasheet.
BQ7721609PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 3 ~ 16
- Fault Protection:
- Over Temperature, Over/Under Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
BQ7721609PWR FAQ
1.How can I place an order for BQ7721609PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7721609PWR 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 BQ7721609PWR reliable?
The price and inventory of BQ7721609PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7721609PWR is usually 5 days.
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Once your BQ7721609PWR 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 BQ7721609PWR?
For technical support, including BQ7721609PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7721609PWR requirements.
6.How does Aetrix verify that BQ7721609PWR is sourced from the original manufacturer or authorized distributors?
All BQ7721609PWR 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 BQ7721609PWR meets industry standards.
7.What is the process for return or replacement of BQ7721609PWR?
All BQ7721609PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7721609PWR, 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 BQ7721609PWR part is unused and in its original packaging.
Return procedure for BQ7721609PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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