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Texas Instruments BQ7721603PWR
- Part No.:
- BQ7721603PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7721603PWR.pdf
- Description:
- VOLTAGE AND TEMPERATURE PROTECTI
- Quantity:
- Payment:
- Shipping:
Inventory:1,827
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Product details
Overview
BQ7721603PWR from Texas Instruments is a fixed-threshold, 3- to 16-series Li-ion battery voltage and temperature protection IC with integrated delay timers. It provides independent per-cell overvoltage (4.30 V ±10 mV at 25°C), undervoltage (2.0 V ±30 mV at 25°C), open-wire, overtemperature (75°C), and undertemperature detection. Its active-high 6V COUT/DOUT outputs drive external FETs or fuses in cordless power tool battery packs.
For engineers reviewing the BQ7721603PWR datasheet, BQ7721603PWR pinout, BQ7721603PWR application, or BQ7721603PWR equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and timing behavior, and real-world implementation context for battery pack safety design.
Technical Context
The BQ7721603PWR implements independent analog cell voltage monitoring across all 16 sense inputs (V1–V16) with dedicated comparators for OVP/UVP/OW, coupled to a fixed 2-second internal delay timer for both overvoltage and undervoltage faults. Its TS pin interfaces ratiometrically with an external NTC thermistor using a factory-trimmed 20 kΩ internal pullup to detect overtemperature at 75°C with ±5°C accuracy.
It features dual fault outputs: COUT asserts on overvoltage or open-wire; DOUT asserts on undervoltage or open-wire; both assert simultaneously on overtemperature. Output drive is configured as active-high with 6V capability and 4.5 mA source current, eliminating need for external level-shifting in high-side FET control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.30 V ±10 mV at 25°C - enables precise cell balancing cutoff before electrolyte decomposition |
| UVP Threshold | 2.00 V ±30 mV at 25°C - prevents copper dissolution and irreversible capacity loss during deep discharge |
| OT Threshold | 75°C ±5°C - triggers shutdown before thermal runaway onset in Li-ion cells |
| Delay Time | 2 s for both OVP and UVP - suppresses false trips from transient spikes while ensuring timely response |
| Supply Current | ≈3.5 µA (no fault) - minimizes parasitic drain on idle battery packs |
| Cell Input Leakage | <100 nA (OW disabled) - preserves cell voltage stability without external bleed resistors |
| Output Drive | Active-high 6V, 4.5 mA source - directly drives gate of high-side N-channel FETs without buffer |
Pinout & Package
Package: 24-pin TSSOP (PW), 4.40 mm × 7.80 mm body, 0.65 mm lead pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15, 16 | NC | No internal connection; must be left floating or tied to GND per layout best practice |
| 2 | VDD | Main unregulated supply input (5–75 V); powers internal regulator and sensing circuitry |
| 3–20 | V16–V1 | Independent cell voltage sense inputs; V1 connects to lowest cell anode, V16 to top cell cathode |
| 21 | VSS | IC ground reference and connection to negative terminal of bottom cell |
| 22 | COUT | Active-high 6V fault output for overvoltage and open-wire; drives external protection FET gate |
| 23 | DOUT | Active-high 6V fault output for undervoltage and open-wire; used with COUT for dual-trigger redundancy |
| 24 | TS | NTC thermistor interface pin; ratiometric measurement against 20 kΩ internal pullup resistor |
Key Features
| Feature | Design Value |
|---|---|
| Random cell connection support | Enables flexible PCB layout and field-repairable pack assembly without strict cell stacking order |
| Customer Test Mode (CTM) | Reduces fault delay to 50 ms for production-line functional testing without modifying hardware |
| Open-wire detection | Identifies broken interconnects between cells using 50 µA pulsed sink, preventing false OVP/UVP trips |
| Functional safety-capable architecture | Includes oscillator health check and internal timer supervision for ISO 26262 ASIL-B readiness |
| Fixed OTP configuration | Eliminates external programming components-OVP/UVP thresholds, delays, and output polarity are factory-set |
Applications
| Handheld Power Tools | Cordless Vacuum Cleaners |
|---|---|
|
Use Scenario: 10–18S Li-ion battery packs powering brushless motor controllers under high-current burst loads (≥30 A). IC Role / Device Role / Timing Role: Primary voltage and temperature supervisor; asserts COUT/DOUT within 2 s to disable charge/discharge FETs upon cell imbalance or thermal excursion. Use Value: Prevents thermal runaway during stall conditions and avoids permanent capacity loss from overdischarge during low-battery runtime extension. |
Use Scenario: 12S–14S battery modules supplying 200–400 W suction motors with rapid duty-cycle transitions. IC Role / Device Role / Timing Role: Independent per-cell monitoring ensures no single cell exceeds 4.30 V during regenerative braking recharge pulses. Use Value: Enables safe fast-charging integration by detecting localized overvoltage before adjacent cells reach threshold, preserving cycle life. |
| Light Electric Vehicles | UPS Battery Backup |
|
Use Scenario: 13S eBike battery packs operating in ambient temperatures from –10°C to 50°C with frequent partial charging. IC Role / Device Role / Timing Role: TS pin monitors NTC to enforce 75°C overtemperature cutoff during hill-climb acceleration; open-wire detection validates cell string continuity after vibration exposure. Use Value: Mitigates fire risk from sustained high-temp operation and prevents catastrophic failure due to undetected intercell weld fractures. |
Use Scenario: 16S UPS systems maintaining standby float charge and delivering short-duration high-power backup (≥5 kW). IC Role / Device Role / Timing Role: Dual-output architecture allows COUT to control discharge FETs and DOUT to control charge FETs independently during grid outage transitions. Use Value: Enables asymmetric protection logic-e.g., tighter UVP for discharge path, relaxed OVP for charge path-without external logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7721602PWR | Same 24-pin TSSOP package and active-high 6V outputs, but OVP = 4.325 V, UVP = 2.25 V, and 1 s delay times | Suitable for higher-voltage Li-ion chemistries (e.g., NMC 4.35 V max) requiring faster fault response | Select BQ7721602PWR when tighter OVP margin and shorter delay are needed for high-power tools with aggressive charge algorithms |
| BQ7721613PWR | Same package and output drive, but OVP = 4.25 V, UVP = 2.0 V, OT = 83°C, and 4 s delays | Optimized for high-temperature environments (e.g., enclosed eScooter battery compartments) with extended delay tolerance | Choose BQ7721613PWR where thermal derating is prioritized over speed, such as in sealed enclosures with limited airflow |
Compared with BQ7721602PWR and BQ7721613PWR, the BQ7721603PWR offers a balanced trade-off: mid-range OVP (4.30 V) compatible with standard NMC, 2 s delays that reject noise without compromising safety, and 75°C OT threshold aligned with common cell thermal limits.
Availability
BQ7721603PWR 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-term lifecycle support, and traceable sourcing.
Supply support for BQ7721603PWR 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 BQ77216xx product line is designed specifically for cost-sensitive, high-volume Li-ion battery packs in consumer and industrial portable equipment, emphasizing fixed-function reliability, minimal external components, and robust fault coverage.
FAQ
What is the overvoltage protection threshold and accuracy of the BQ7721603PWR?
The BQ7721603PWR has a fixed overvoltage protection threshold of 4.30 V, with accuracy of ±10 mV at 25°C and ±20 mV across 0°C to 60°C. This specification is factory-programmed into one-time programmable (OTP) memory and cannot be adjusted externally. The BQ7721603PWR uses precision internal references and matched comparator circuitry to maintain this tolerance without calibration.
How does the BQ7721603PWR handle open-wire detection, and what is its impact on system design?
The BQ7721603PWR performs open-wire detection by applying a 50 µA pulsed sink current to each Vx input every 128 ms and measuring resulting voltage drop. If Vn falls below Vn−1 by more than 200 mV, it triggers both COUT and DOUT after the 4 s delay. This eliminates need for external continuity test circuits and supports random cell connection, simplifying pack assembly and field repair. The BQ7721603PWR's low 100 nA input leakage (with OW disabled) also reduces passive discharge.
Can the BQ7721603PWR be used in 3-series battery configurations, and how are unused sense pins handled?
Yes, the BQ7721603PWR supports 3- to 16-series Li-ion stacks. For configurations with fewer than 16 cells, unused Vx pins (e.g., V4–V16 in a 3S pack) must be connected to VSS through 1 kΩ resistors to prevent floating inputs and ensure stable operation. The BQ7721603PWR's architecture automatically ignores disconnected cells beyond the stack length, and its random connection feature allows V1–V3 to be assigned to any physical cell position.
What is the purpose and activation method of Customer Test Mode (CTM) in the BQ7721603PWR?
Customer Test Mode (CTM) reduces the BQ7721603PWR's fault delay time from 2 s to 50 ms for rapid production-line validation of protection functionality. CTM is activated by raising VDD to at least 12 V above the voltage at V16 (VCTM ≥ 12 V). The BQ7721603PWR automatically exits CTM when the VDD-to-V16 differential drops below 10 V. This mode requires strict adherence to absolute maximum ratings to avoid damage.
Does the BQ7721603PWR support undertemperature protection, and how is it implemented?
No, the BQ7721603PWR does not support undertemperature protection. Per the device comparison table, its UTC (undertemperature cutoff) is listed as "NA", and the TS pin is configured only for overtemperature detection at 75°C. Undertemperature functionality is available in other variants like BQ7721607PWR (UTC = –30°C) and BQ7721613PWR (UTC = –30°C), but is omitted in the BQ7721603PWR to reduce cost and complexity for applications where low-temp charging is managed externally.
BQ7721603PWR 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
BQ7721603PWR FAQ
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Please submit a Request for Quotation (RFQ) for BQ7721603PWR 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 BQ7721603PWR reliable?
The price and inventory of BQ7721603PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7721603PWR is usually 5 days.
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Once your BQ7721603PWR 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 BQ7721603PWR?
For technical support, including BQ7721603PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7721603PWR requirements.
6.How does Aetrix verify that BQ7721603PWR is sourced from the original manufacturer or authorized distributors?
All BQ7721603PWR 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 BQ7721603PWR meets industry standards.
7.What is the process for return or replacement of BQ7721603PWR?
All BQ7721603PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7721603PWR, 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 BQ7721603PWR part is unused and in its original packaging.
Return procedure for BQ7721603PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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