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Texas Instruments BQ7791506PW
- Part No.:
- BQ7791506PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7791506PW.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,584
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Product details
Overview
BQ7791506PW from Texas Instruments is a stackable ultra-low power primary protector IC for 3- to 5-series Li-ion/Li-polymer battery packs, implementing autonomous voltage (±10 mV OV/±18 mV UV), current (OCD1: –2500 mV, OCD2: –100 mV, SCD: –300 mV), and temperature (OTD: 65°C, OTC: 50°C) protections without MCU control. It delivers smart passive cell balancing up to 50 mA and operates at 2 µA in HIBERNATE mode - critical for e-bike and power tool battery longevity and safety.
For engineers reviewing the BQ7791506PW datasheet, BQ7791506PW pinout, BQ7791506PW application, or BQ7791506PW equivalent, key selection considerations include its factory-programmed 3.8 V overvoltage threshold with 200 mV hysteresis, load-removal recovery for OCD1/OCD2/SCD faults, and TSSOP-24 package compatibility with stacked multi-device configurations up to 20-series cells.
Technical Context
The BQ7791506PW implements independent low-side NMOS CHG and DSG FET drivers with programmable overcurrent delay via OCDP resistor, enabling precise discharge protection tuning. Its cascade interface (LPWR/PRES/CBO/CBI) supports daisy-chained stacking while maintaining autonomous operation per device.
Cell balancing is executed via integrated FETs with 50-mA max current and 50-mV step resolution between VCBTH and VCBTL thresholds; external FET support allows higher balancing currents. Temperature sensing uses a 10-kΩ NTC thermistor biased by VTB, with OTD/OTC/UTD/UTC thresholds set by analog mV-level detection referenced to VTB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 2 µA in HIBERNATE mode - enables multi-year shelf life for shipped battery packs without self-discharge risk. |
| Overvoltage Threshold | 3.800 V ±10 mV - factory-programmed for tight cell voltage clamp in 3–5S Li-ion systems. |
| Undervoltage Threshold | 2.500 V ±18 mV - prevents deep discharge damage during high-load e-bike or power tool operation. |
| OCD1 Delay | 50 ms - resistor-programmable via OCDP pin, allowing trade-off between false-trigger immunity and fault response speed. |
| Cell Balancing Current | Up to 50 mA - sufficient for passive balancing of 3–5S packs with <50 mV inter-cell variance at full charge. |
| Operating Temp Range | –40°C to +85°C - supports industrial-grade operation in robotic vacuum cleaners and outdoor power equipment. |
| Max Cell Input Rating | 36 V absolute - ensures robustness against transient spikes in 10.8–72-V pack architectures. |
Pinout & Package
TSSOP-24 package (7.70 mm × 4.40 mm), 0.65-mm pitch, lead-free, RoHS-compliant - optimized for compact, high-density battery management PCB layouts with thermal relief via exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3–25 V main supply rail; powers internal logic and drivers - requires 1-µF ceramic decoupling to VSS. |
| VC0–VC5 | Cell voltage sense inputs | Differential monitoring of 6 cell nodes (supports 3–5S via CCFG configuration); open-wire detection enabled. |
| SRP/SRN | Current sense differential inputs | Measures pack current via external shunt; enables OCD1/OCD2/SCD detection with ±20% accuracy above 20 mV. |
| DSG / CHG | Low-side FET gate drivers | Drive external NMOS FETs; DSG sinks up to 1 mA, CHG sources up to 1 mA - compatible with 1-MΩ gate resistors. |
| PRES / LPWR | HIBERNATE mode control | PRES high = NORMAL mode; floating = HIBERNATE; LPWR connects to lower device's PRES in stack - enables synchronized ultra-low-power state. |
| CBI / CBO | Cell balancing enable/control | CBI low = enable balancing; CBO drives upper device's CBI in stack - supports cascaded balancing across devices. |
| OCDP | OCD delay programming | Resistor-to-VSS sets OCD1/OCD2 delay (50 ms for BQ7791506); eliminates need for external timing capacitors. |
| TS / VTB | NTC thermistor interface | VTB provides 3.3-V bias; TS reads thermistor voltage - supports dual-threshold OTD/OTC/UTD/UTC protection with 10-kΩ reference. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous stackable architecture | Enables scalable 3S–20S protection using identical BQ7791506PW devices - no host MCU or firmware required for basic protection. |
| Smart passive cell balancing | Integrated 50-mA FETs with 50-mV VSTEP resolution balance cells only when voltage exceeds VCBTH - minimizes heat and power loss. |
| Load-removal recovery | Automatic reset of OCD1/OCD2/SCD faults upon load removal - eliminates manual reset requirement in consumer tools and e-bikes. |
| HIBERNATE mode | Reduces current to 2 µA and disables all protections except wake-up circuitry - ideal for long-term storage and shipping compliance. |
| Factory-programmed protection set | Fixed OV=3.8 V, UV=2.5 V, OTD=65°C, OTC=50°C, OCD1=–2500 mV, OCD2=–100 mV, SCD=–300 mV - eliminates field calibration effort. |
Applications
| Power Tools | e-Bikes |
|---|---|
|
Use Scenario: Cordless drill/driver operating at peak 30-A discharge with intermittent high-torque loads. IC Role / Device Role / Timing Role: Primary protector enforcing 65°C OTD cutoff and –2500-mV OCD1 shutdown within 50 ms to prevent FET thermal runaway. Use Value: Eliminates need for external microcontroller-based monitoring while sustaining >1000-cycle pack life under aggressive duty cycles. |
Use Scenario: 48-V, 14-Ah e-bike battery subjected to regenerative braking and hill-climb surges. IC Role / Device Role / Timing Role: Autonomous cell balancer correcting >30-mV inter-cell variance at 4.2 V, extending usable capacity by 8–12% over 500 cycles. Use Value: Maintains SOC accuracy and prevents premature pack failure due to imbalance-induced overcharge/undervoltage events. |
| Robotic Vacuum Cleaners | Garden Tools |
|
Use Scenario: Compact 22-V robot vacuum with space-constrained 4S pack and frequent partial-charge cycles. IC Role / Device Role / Timing Role: Ultra-low 2-µA HIBERNATE mode preserves charge during 30-day storage; 1.3-V LD threshold detects open-pack condition. Use Value: Reduces annual standby loss to <0.5% of capacity - critical for maintenance-free consumer robotics. |
Use Scenario: 60-V string trimmer experiencing vibration-induced connector fretting and thermal cycling. IC Role / Device Role / Timing Role: Open-wire detection on VCx pins identifies broken cell interconnects within 4.5 s; 36-V abs max rating withstands motor back-EMF transients. Use Value: Prevents unsafe operation with missing cells and avoids catastrophic thermal events during high-vibration use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar primary battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7791508PW | Higher OV (4.2 V), longer OCD1 delay (1420 ms), –20°C UTD threshold | Better suited for high-voltage 5S Li-ion packs requiring extended overcurrent fault tolerance | Select for 48–72-V e-bike packs where slower fault response improves surge immunity |
| BQ7791514PW | Lower OV (3.65 V), tighter SCD threshold (–200 mV), 50-ms OCD1 delay | Optimized for high-safety 3S–4S power banks with fast short-circuit response | Choose when rapid SCD cutoff (<1 ms) and lower overvoltage clamp are mandatory |
Compared with BQ7791506PW, BQ7791508PW trades faster fault response for greater surge tolerance, while BQ7791514PW prioritizes precision low-voltage clamping and sub-millisecond short-circuit reaction - neither offers pin-compatible replacement without layout or resistor network changes.
Availability
BQ7791506PW is available at Aetrix Electronics and suitable for e-bike battery packs, cordless power tools, and robotic vacuum cleaner designs requiring stable component supply, long-term lifecycle support, and automotive-grade reliability under thermal stress.
Supply support for BQ7791506PW 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 leadership in battery management ICs.
The BQ77915 family targets cost-sensitive, high-volume portable energy storage systems where autonomous, ultra-low-power protection replaces MCU-dependent solutions - especially in 3S–5S Li-ion applications.
FAQ
What is the factory-programmed overvoltage threshold for BQ7791506PW?
The BQ7791506PW has a fixed overvoltage threshold of 3.800 V ±10 mV, with 200 mV hysteresis. This value is laser-trimmed during manufacturing and cannot be adjusted externally - ensuring consistent cell protection across production batches without calibration overhead.
Does BQ7791506PW support stacking for more than 5-series battery configurations?
Yes, BQ7791506PW supports stacking via its LPWR/PRES/CBO/CBI interface. Up to four BQ7791506PW devices can be cascaded to protect 6–20 series cells. Each device manages its local cell group autonomously, eliminating single-point failure risk in high-voltage packs.
How does the HIBERNATE mode function on BQ7791506PW?
HIBERNATE mode activates when the PRES pin is left floating, reducing quiescent current to 2 µA. In this state, all protections and balancing are disabled except wake-up circuitry. Exiting HIBERNATE requires driving PRES ≥1.5 V for >10 ms - enabling safe shipping and long-term storage of battery packs.
Can BQ7791506PW perform cell balancing without external components?
Yes, BQ7791506PW integrates cell balancing FETs capable of up to 50 mA per cell. No external FETs are required for balancing currents ≤50 mA. For higher currents, external FETs can be added using the CBO/CBI interface and RCB resistor - preserving design flexibility.
What is the purpose of the OCDP pin on BQ7791506PW?
The OCDP pin on BQ7791506PW allows resistor-based programming of overcurrent discharge 1 (OCD1) and OCD2 fault detection delays. For BQ7791506PW, a specific resistor value sets the 50-ms OCD1 delay - removing timing capacitor dependencies and improving board-level reliability.
BQ7791506PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 3 ~ 5
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
BQ7791506PW FAQ
1.How can I place an order for BQ7791506PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7791506PW 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 BQ7791506PW reliable?
The price and inventory of BQ7791506PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7791506PW is usually 5 days.
3.What payment methods are accepted for BQ7791506PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7791506PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7791506PW?
BQ7791506PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7791506PW 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 BQ7791506PW?
For technical support, including BQ7791506PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7791506PW requirements.
6.How does Aetrix verify that BQ7791506PW is sourced from the original manufacturer or authorized distributors?
All BQ7791506PW 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 BQ7791506PW meets industry standards.
7.What is the process for return or replacement of BQ7791506PW?
All BQ7791506PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ7791506PW, 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 BQ7791506PW part is unused and in its original packaging.
Return procedure for BQ7791506PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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