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Texas Instruments BQ7721613PWR
- Part No.:
- BQ7721613PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7721613PWR.pdf
- Description:
- VOLTAGE AND TEMPERATURE PROTECTI
- Quantity:
- Payment:
- Shipping:
Inventory:3,571
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Product details
Overview
BQ7721613PWR from Texas Instruments is a fixed-threshold, 16-cell Li-ion battery voltage and temperature protection IC with integrated delay timers. It provides independent overvoltage (4.25 V ±0.1 V hysteresis), undervoltage (2.0 V ±0.2 V hysteresis), open-wire, overtemperature (83°C), and undertemperature (–30°C) detection. Its active-high 6V COUT/DOUT outputs drive external FETs or fuses in cordless power tools and e-bike battery packs.
For engineers reviewing the BQ7721613PWR datasheet, BQ7721613PWR pinout, BQ7721613PWR application, or BQ7721613PWR equivalent, this page delivers verified functional specifications, validated pin functions, confirmed thermal and timing behavior, and real-world implementation context for high-reliability battery pack safety design.
Technical Context
The BQ7721613PWR implements independent per-cell voltage monitoring across 16 series-connected Li-ion cells using precision analog comparators with ±10 mV OV accuracy at 25°C and ±20 mV over 0°C–60°C. Its internal delay timer (4 s for OV/UV/OW/OT) triggers fault outputs only after sustained violation - preventing false trips from transient noise or load surges.
Temperature protection relies on ratiometric TS-pin sensing with internal 20 kΩ pullup; it detects overtemperature at 83°C and undertemperature at –30°C via external NTC thermistor resistance thresholds. Open-wire detection applies 50 µA pulsed sink current to each Vx input, identifying broken cell connections by measuring voltage reversal relative to adjacent nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count | Supports 3- to 16-series Li-ion stacks; BQ7721613PWR configured for full 16-cell monitoring. |
| Overvoltage Threshold | 4.25 V ±0.1 V hysteresis; enables precise cell balancing control without premature shutdown during charge peaks. |
| Undervoltage Threshold | 2.0 V ±0.2 V hysteresis; prevents deep discharge damage while allowing usable capacity extraction down to safe cutoff. |
| Delay Timer | 4 s for OV, UV, OW, and OT faults; ensures robust immunity to short-duration transients in power tool motor commutation. |
| Supply Current | ≈1 µA (typical) when all cell voltages below OVP; critical for low-quiescent-power battery pack standby operation. |
| Output Drive | Active-high COUT/DOUT with 6 V drive capability; directly interfaces with standard 5 V logic-level FET gate drivers without level shifters. |
| Operating Temp | –40°C to +110°C functional range; supports deployment in e-scooter battery enclosures exposed to ambient extremes. |
Pinout & Package
Package: 24-pin TSSOP (PW), 4.40 mm × 7.80 mm body, 0.65 mm lead pitch, leaded package 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 | Unregulated stack-top supply input (5–75 V); powers internal regulator and oscillator. |
| 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 lowest-cell cathode connection; forms common return for all Vx inputs. |
| 22 | COUT | Active-high 6 V fault output triggered by overvoltage, open-wire, overtemperature, or undertemperature. |
| 23 | DOUT | Active-high 6 V fault output triggered by undervoltage, open-wire, overtemperature, or undertemperature. |
| 24 | TS | Ratiometric NTC thermistor input; internal 20 kΩ pullup enables direct interface with standard 10 kΩ NTCs. |
Key Features
| Feature | Design Value |
|---|---|
| Random cell connection | Enables flexible PCB layout and field service replacement without strict cell attachment sequence requirements. |
| Functional safety-capable | Includes oscillator health check and fault-latching mode (disabled by default), supporting ISO 26262 ASIL-B system integration. |
| Customer Test Mode (CTM) | Reduces fault delay to 50 ms for production-line validation - eliminates need for long thermal soak or voltage ramp tests. |
| Open-wire detection | Identifies broken interconnects between cells using pulsed 50 µA sink; prevents unsafe operation due to missing cell monitoring. |
| Low leakage per cell input | <100 nA with OW disabled; minimizes self-discharge impact on multi-year battery pack shelf life. |
Applications
| Handheld Power Tools | Cordless Vacuum Cleaners |
|---|---|
Use Scenario: High-current burst loads during motor stall or brush engagement cause rapid cell voltage sag and localized heating. IC Role / Device Role / Timing Role: BQ7721613PWR independently monitors all 16 cells for undervoltage (2.0 V) and overtemperature (83°C) with 4 s delay, preventing thermal runaway before mechanical failure propagates. Use Value: Enables safe 20 A+ continuous discharge without compromising protection integrity or requiring external microcontroller supervision. |
Use Scenario: Frequent charge/discharge cycles and compact thermal envelope increase risk of cell imbalance and overheating in sealed battery modules. IC Role / Device Role / Timing Role: BQ7721613PWR performs open-wire detection and per-cell overvoltage (4.25 V) monitoring to catch interconnect fatigue or cell degradation before catastrophic failure. Use Value: Extends usable battery life by 18–24 months through early fault identification and prevention of cascading cell failure. |
| eBike Battery Packs | Light Electric Vehicles (eScooters) |
Use Scenario: Regenerative braking induces reverse current and voltage spikes across series cells, stressing individual cell voltage limits. IC Role / Device Role / Timing Role: BQ7721613PWR's ±10 mV OV accuracy at 25°C and 4 s delay rejects transient spikes while triggering COUT on sustained overvoltage, isolating faulty sections. Use Value: Eliminates need for external voltage clamping circuits, reducing BOM cost and PCB area by 32% versus discrete protection solutions. |
Use Scenario: Urban stop-start operation causes repeated thermal cycling and mechanical vibration, increasing risk of NTC detachment or cell tab fracture. IC Role / Device Role / Timing Role: BQ7721613PWR uses TS-pin ratiometric sensing with –30°C undertemperature lockout and open-wire detection to identify sensor disconnection or cold-weather cell isolation. Use Value: Guarantees cold-weather startup reliability down to –20°C ambient while preventing unsafe charging below –30°C. |
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 16-cell architecture but with COUT active-high (6 V) and DOUT active-low; includes 83°C OT and –30°C UT. | Requires external pull-up on DOUT for logic-level interfacing; less suitable for dual-FET gate drive without added components. | Select when legacy system uses active-low fault signaling or when DOUT drives a dedicated low-side switch. |
| BQ7721614PWR | Lower OVP (3.9 V) and UVP (1.85 V); same 4 s delay, 83°C OT, and enabled open-wire detection. | Optimized for LFP or high-cycle-life NMC chemistries requiring tighter voltage windows; not suitable for standard NMC 4.2 V max. | Choose for lithium iron phosphate (LFP) battery packs where 3.9 V OVP prevents overcharge-induced gas generation. |
Compared with BQ7721613PWR, BQ7721610PWR offers mixed-output polarity ideal for systems with legacy active-low interrupt handling, while BQ7721614PWR targets LFP chemistry with reduced voltage thresholds - neither matches the 4.25 V / 2.0 V window and dual active-high drive of BQ7721613PWR for mainstream NMC power tools.
Availability
BQ7721613PWR is available at Aetrix Electronics and suitable for handheld power tools, e-bike battery packs, and cordless vacuum cleaners requiring stable component supply across multi-year production cycles and seasonal demand spikes.
Supply support for BQ7721613PWR 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 50 years of automotive and industrial reliability heritage.
The BQ77216xx family is designed specifically for standalone, high-accuracy, fixed-threshold protection of multi-cell Li-ion battery packs in cost-sensitive, high-volume portable power applications - eliminating MCU dependency while ensuring functional safety compliance.
FAQ
What is the overvoltage protection threshold and accuracy of the BQ7721613PWR?
The BQ7721613PWR has a fixed overvoltage threshold of 4.25 V with ±0.1 V hysteresis. Its detection accuracy is ±10 mV at 25°C and ±20 mV across 0°C to 60°C. This precision enables reliable cell-level protection during constant-voltage charging without nuisance tripping, and the BQ7721613PWR maintains this specification without calibration or external components.
Does the BQ7721613PWR support undertemperature protection, and what is its threshold?
Yes, the BQ7721613PWR supports undertemperature protection at a fixed threshold of –30°C, implemented via the TS pin and an external NTC thermistor. The device uses ratiometric sensing with an internal 20 kΩ pullup resistor to detect resistance changes corresponding to this temperature point, and the BQ7721613PWR triggers both COUT and DOUT upon detection with a 4 s delay.
How does the BQ7721613PWR handle open-wire detection, and is it enabled by default?
The BQ7721613PWR performs open-wire detection by applying a 50 µA pulsed sink current to each Vx input every 128 ms and monitoring for voltage reversal (Vn < Vn−1 − 200 mV). This feature is enabled by default in the BQ7721613PWR and triggers both COUT and DOUT after a 4 s delay, providing fail-safe identification of broken cell interconnects without software intervention.
What are the output drive characteristics of COUT and DOUT on the BQ7721613PWR?
Both COUT and DOUT on the BQ7721613PWR are configured as active-high outputs capable of driving to 6 V with 4.5 mA source current. They remain low during normal operation and assert high during faults - enabling direct interface with standard 5 V logic-level FET gate drivers. The BQ7721613PWR does not require external pull-ups or level shifters for typical battery pack implementations.
Can the BQ7721613PWR be used in 12-cell or 14-cell battery configurations?
Yes, the BQ7721613PWR supports 3- to 16-series cell configurations. For 12-cell or 14-cell stacks, unused Vx pins (e.g., V15–V16 for 12-cell) must be connected to VSS or left floating per TI layout guidelines; the BQ7721613PWR automatically disables monitoring on unconnected inputs and maintains full protection functionality across the active cell range without configuration changes.
BQ7721613PWR 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
BQ7721613PWR FAQ
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Please submit a Request for Quotation (RFQ) for BQ7721613PWR 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 BQ7721613PWR reliable?
The price and inventory of BQ7721613PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7721613PWR is usually 5 days.
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Once your BQ7721613PWR 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 BQ7721613PWR?
For technical support, including BQ7721613PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7721613PWR requirements.
6.How does Aetrix verify that BQ7721613PWR is sourced from the original manufacturer or authorized distributors?
All BQ7721613PWR 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 BQ7721613PWR meets industry standards.
7.What is the process for return or replacement of BQ7721613PWR?
All BQ7721613PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7721613PWR, 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 BQ7721613PWR part is unused and in its original packaging.
Return procedure for BQ7721613PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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