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Texas Instruments BQ7721616PWR
- Part No.:
- BQ7721616PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7721616PWR.pdf
- Description:
- VOLTAGE AND TEMPERATURE PROTECTI
- Quantity:
- Payment:
- Shipping:
Inventory:1,975
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Product details
Overview
BQ7721616PWR from Texas Instruments is a fixed-threshold, 16-cell Li-ion battery voltage and temperature protection IC with integrated delay timers. It provides independent per-cell overvoltage (4.18 V ±0.1 V hysteresis) and undervoltage (2.0 V ±0.2 V hysteresis) detection, open-wire fault sensing, and overtemperature (80°C) / undertemperature (–20°C) protection via external NTC. It drives active-high COUT/DOUT outputs to 6 V and consumes ≈1 µA in quiescent state - deployed in cordless power tools and e-bike battery packs.
For engineers reviewing the BQ7721616PWR datasheet, BQ7721616PWR pinout, BQ7721616PWR application, or BQ7721616PWR equivalent, this page delivers verified specifications, TSSOP-24 pin mapping, functional safety-capable architecture, real-world use cases in handheld power tools and light EVs, and two validated alternative parts with documented technical differences.
Technical Context
The BQ7721616PWR implements independent analog voltage comparators per cell input (V1–V16), each referenced to VSS, with fixed internal thresholds programmed at factory. Its internal oscillator triggers fixed-delay timers (4 s for OV/UV/OW/OT) upon fault detection, and it supports Customer Test Mode (CTM) with 50 ms delay for production-line validation.
Temperature monitoring uses ratiometric TS-pin sensing with internal 20 kΩ pullup (RNTC), comparing external NTC resistance against preprogrammed ROT_EXT = 1651 Ω (for 80°C OT) and RUT_EXT (for –20°C UT). Output drive is CMOS active-high on both COUT and DOUT, capable of sourcing 4.5 mA and sinking up to 3 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.18 V ±0.1 V hysteresis - sets precise cell overcharge cutoff without external adjustment |
| UVP Threshold | 2.0 V ±0.2 V hysteresis - prevents deep discharge damage across full operating temperature range |
| OT/UT Thresholds | 80°C overtemperature and –20°C undertemperature - configured via factory-trimmed NTC resistance lookup |
| Delay Timer | 4 s for OV, UV, OW, OT faults - ensures transient spikes do not trigger false shutdowns |
| Supply Current | ≈1 µA (VCELL < VOV) - enables multi-year shelf life in battery pack standby mode |
| Output Drive | COUT/DOUT active-high to 6 V, 4.5 mA source - directly interfaces with external FET gate drivers or fuse control logic |
| Cell Input Leakage | <100 nA per Vx pin (OW disabled) - minimizes self-discharge impact on high-impedance cell strings |
Pinout & Package
Package: 24-pin TSSOP (PW), 4.40 mm × 7.80 mm body, 0.65 mm lead pitch, leaded, RoHS-compliant.
| 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 unregulated supply input - connects to top-of-stack voltage (up to 75 V) |
| 3–20 | V16–V1 | Cell voltage sense inputs - monitor positive terminal of cells 16 to 1 relative to VSS |
| 21 | VSS | IC ground and stack reference - electrically tied to negative terminal of lowest cell |
| 22 | COUT | Fault output - active-high (6 V) signal triggered by OV, OW, OT, or UT events |
| 23 | DOUT | Fault output - active-high (6 V) signal triggered by UV, OW, OT, or UT events |
| 24 | TS | NTC thermistor interface - ratiometric input using internal 20 kΩ pullup resistor |
Key Features
| Feature | Design Value |
|---|---|
| Per-cell voltage monitoring | Independent analog comparators for all 16 cells - eliminates shared-reference error in stacked configurations |
| Fixed internal delay timers | 4 s OV/UV/OW/OT delay - factory-programmed, no external RC components required |
| Active-high 6 V outputs | COUT/DOUT drive to 6 V with 4.5 mA source capability - directly controls external MOSFET gates without level-shifting |
| Open-wire detection | 50 µA pulsed sink per Vx input - detects broken interconnects without adding series resistors in cell paths |
| Functional safety capability | Includes oscillator health check and fault-latching option - supports ISO 26262 ASIL-B system-level compliance |
Applications
| Handheld Power Tools | Cordless Vacuum Cleaners |
|---|---|
Use Scenario: 12–16S Li-ion packs powering brushless motors under intermittent high-current loads (e.g., drill torque bursts). IC Role / Device Role / Timing Role: Real-time per-cell voltage supervision and thermal cutoff to prevent cell imbalance, overcharge, or thermal runaway during aggressive duty cycles. Use Value: Enables safe operation at >20 A peak current while maintaining ±10 mV OVP accuracy at 25°C and retaining 1 µA quiescent draw between cycles. |
Use Scenario: 10–14S battery modules supplying variable-speed suction motors and digital control boards in compact form factors. IC Role / Device Role / Timing Role: Simultaneous undervoltage lockout and open-wire detection to avoid motor stall-induced voltage collapse and detect broken cell interconnects during vibration-heavy operation. Use Value: Prevents irreversible capacity loss via 2.0 V UVP threshold with 0.2 V hysteresis and confirms physical integrity of all 16 cell connections before enabling charge/discharge. |
| Light Electric Vehicles (eBikes) | UPS Battery Backup Systems |
Use Scenario: 13–16S packs delivering regenerative braking energy and sustaining 10–30 A continuous discharge in outdoor environments (–20°C to 65°C). IC Role / Device Role / Timing Role: Dual-fault response (COUT + DOUT activation) for overtemperature (80°C) and undertemperature (–20°C) events using single NTC on TS pin. Use Value: Guarantees safe charging below –20°C and thermal shutdown above 80°C without external ADC or microcontroller intervention. |
Use Scenario: 12–16S backup batteries in telecom or industrial UPS systems requiring decades-long reliability and zero maintenance during float storage. IC Role / Device Role / Timing Role: Ultra-low ICC ≈1 µA monitoring during standby - extends shelf life and reduces self-discharge-induced capacity loss over multi-year deployments. Use Value: Maintains cell voltage integrity across all 16 cells with <100 nA leakage per input (OW disabled), critical for long-term float applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7721610PWR | Same 24-pin TSSOP package; identical 4 s OV/UV delays but different thresholds: 4.25 V OVP, 2.5 V UVP, 83°C OT, –30°C UT; COUT active-high, DOUT active-low | Supports wider low-temp operation (–30°C vs –20°C) and higher overvoltage margin; dual-output polarity simplifies FET driver interface | Select when deeper cold-weather operation or mixed-polarity fault signaling is required |
| BQ7721613PWR | Same package; 4.25 V OVP, 2.0 V UVP, 83°C OT, –30°C UT, open-wire enabled, active-high COUT/DOUT | Enables open-wire detection (disabled on BQ7721616PWR) and extends OT/UT range; same 4 s timing and 6 V drive | Select when open-wire fault coverage is mandatory and extended thermal thresholds are needed |
Compared with BQ7721616PWR, BQ7721610PWR offers asymmetric output polarity and broader low-temperature support, while BQ7721613PWR adds open-wire detection and higher overtemperature setpoint - both retain identical TSSOP-24 footprint and 4 s delay architecture but serve distinct system-level fault coverage requirements.
Availability
BQ7721616PWR is available at Aetrix Electronics and suitable for handheld power tools, light electric vehicles, and cordless vacuum cleaners requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability in battery management systems.
Supply support for BQ7721616PWR 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 over 90 years of innovation in industrial, automotive, and consumer electronics.
The BQ77216xx product line is designed specifically for standalone, cost-optimized, fixed-threshold protection of 3–16S Li-ion battery packs - targeting applications where MCU-based monitoring is unnecessary and ultra-low power consumption is critical.
FAQ
What is the overvoltage protection threshold of the BQ7721616PWR?
The BQ7721616PWR has a factory-programmed overvoltage protection (OVP) threshold of 4.18 V with ±0.1 V hysteresis. This value is laser-trimmed during manufacturing and cannot be adjusted externally. It applies to each individual cell monitored via V1–V16 inputs, ensuring consistent overcharge prevention across the full 16-cell stack without calibration.
Does the BQ7721616PWR support open-wire detection?
No, the BQ7721616PWR has open-wire detection disabled per its device configuration table. Unlike variants such as BQ7721613PWR, this part does not activate the 50 µA pulsed sink on Vx pins and therefore cannot detect broken cell interconnects. System designers must implement mechanical or secondary electrical verification if open-wire coverage is required.
What are the temperature thresholds programmed into the BQ7721616PWR?
The BQ7721616PWR is factory-configured for overtemperature (OT) detection at 80°C and undertemperature (UT) detection at –20°C. These thresholds are implemented via ratiometric comparison of the TS pin voltage against internal references, using the device's 20 kΩ internal pullup (RNTC) and an external NTC thermistor selected to match ROT_EXT = 1651 Ω and RUT_EXT values.
How does the BQ7721616PWR drive its COUT and DOUT pins?
The BQ7721616PWR drives both COUT and DOUT as active-high CMOS outputs capable of sourcing up to 4.5 mA at 6 V. They are not open-drain - each pin internally pulls high to 6 V when active and pulls low to VSS when inactive. This eliminates the need for external pullup resistors and allows direct interfacing with gate drivers or logic-level FET controllers.
What package type and pin count does the BQ7721616PWR use?
The BQ7721616PWR uses a 24-pin TSSOP package (designator PW), with nominal body dimensions of 4.40 mm × 7.80 mm and 0.65 mm lead pitch. It is leaded, RoHS-compliant, and compatible with standard surface-mount reflow processes. Pins 1, 15, and 16 are NC (no connect) and must remain unconnected.
BQ7721616PWR 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
BQ7721616PWR FAQ
1.How can I place an order for BQ7721616PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7721616PWR 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 BQ7721616PWR reliable?
The price and inventory of BQ7721616PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7721616PWR is usually 5 days.
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Once your BQ7721616PWR 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 BQ7721616PWR?
For technical support, including BQ7721616PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7721616PWR requirements.
6.How does Aetrix verify that BQ7721616PWR is sourced from the original manufacturer or authorized distributors?
All BQ7721616PWR 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 BQ7721616PWR meets industry standards.
7.What is the process for return or replacement of BQ7721616PWR?
All BQ7721616PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7721616PWR, 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 BQ7721616PWR part is unused and in its original packaging.
Return procedure for BQ7721616PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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