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Texas Instruments BQ7791502PW
- Part No.:
- BQ7791502PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7791502PW.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,080
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Product details
Overview
BQ7791502PW 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 accuracy), current (OCD1: –10 to –85 mV; SCD: –40 to –340 mV), and temperature (OTD: 65°C; OTC: 45°C) protections with integrated passive cell balancing up to 50 mA. It enables HIBERNATE mode (2 µA) for storage and supports load removal detection in e-bike and power tool battery management systems.
For engineers reviewing the BQ7791502PW datasheet, BQ7791502PW pinout, BQ7791502PW application, or BQ7791502PW equivalent, this page delivers verified technical context, exact pin functions per TSSOP-24 package, confirmed protection thresholds specific to the BQ7791502 variant, and real-world implementation constraints for stacked pack designs requiring autonomous cell balancing and ultra-low quiescent current operation.
Technical Context
The BQ7791502PW implements a fully autonomous protection architecture with factory-programmed thresholds: overvoltage at 4.200 V (±10 mV), undervoltage at 2.900 V (±18 mV), and open-wire detection enabled with 100-nA sink current configuration. Its dual overcurrent discharge stages (OCD1: 70 ms delay; OCD2: 70 ms delay) and short-circuit discharge (120 µs delay) are resistor-programmable via OCDP–VSS.
It uses independent low-side NMOS CHG and DSG FET drivers (VFETON = 11–14 V, RDSGOFF = 10–16 Ω), supports cascade stacking via LPWR–PRES interconnect, and executes smart passive balancing using internal FETs with 50-mA max current and 100-mV hysteresis (VOV–VFC). The device operates across –40°C to +85°C with 36-V absolute max cell input rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 8 µA (NORMAL mode); 2 µA (HIBERNATE mode) - enables multi-year shelf life in shipped battery packs. |
| Overvoltage Threshold | 4.200 V ±10 mV - factory-programmed for precise cell-level safety without MCU intervention. |
| Undervoltage Threshold | 2.900 V ±18 mV - prevents deep discharge damage in 3S–5S Li-ion configurations. |
| OCD1 Delay | 70 ms - resistor-programmable via OCDP pin; balances fault response speed vs. transient immunity. |
| Cell Balancing Current | Up to 50 mA - delivered through integrated FETs; eliminates need for external balancing MOSFETs in most applications. |
| Operating Temp Range | –40°C to +85°C - validated for power tools, e-bikes, and robotic cleaners exposed to ambient thermal stress. |
| Stackable Series Support | 3S to 5S native; ≥6S via cascaded TSSOP-24 devices - enables scalable protection for 10.8-V to 72-V battery packs. |
Pinout & Package
TSSOP-24 package (7.70 mm × 4.40 mm body size), 0.65-mm pitch, thermally enhanced for battery pack PCB layouts with minimal footprint and thermal resistance (RΘJA = 88.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3–25 V main supply; powers analog/digital core and FET drivers; POR threshold at 4 V. |
| VC0–VC5 | Cell voltage sense inputs | Differential sensing of up to 6 cell nodes (VC0 = bottom, VC5 = top); supports 3S–5S configurations directly. |
| SRP/SRN | Current sense differential inputs | Measures pack current via external sense resistor; enables OCD1/OCD2/SCD detection with ±20% accuracy above 20 mV. |
| CHG/DSG | Low-side NMOS FET drivers | Active-high outputs driving gate of external N-channel FETs; VFETON = 11–14 V, tDSGOFF = 5–15 µs. |
| CBI/CBO | Cell balancing control interface | CBI: enable input (low-active); CBO: output to upper device's CBI in stack; supports daisy-chained balancing. |
| PRES/LPWR | HIBERNATE mode interface | PRES: high = NORMAL, floating = HIBERNATE; LPWR: connects to PRES of lower device in stack. |
| OCDP | OCD delay programming | Resistor-to-VSS sets OCD1/OCD2 delay (70 ms for BQ7791502); 10-MΩ for upper stack devices. |
| TS/VTB | NTC thermistor interface | TS: thermistor input; VTB: 3.6-V bias output; supports OTD/OTC/UTD/UTC thresholds using 10-kΩ/103AT network. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous cell balancing | Integrated 50-mA FETs with 100-mV hysteresis and 521-ms group balancing duration eliminate need for host MCU coordination. |
| HIBERNATE mode | 2-µA quiescent current with PRES-pin entry/exit (4.5-s deglitch on entry, 10-ms on exit) extends shelf life during logistics and storage. |
| Stackable protection architecture | LPWR–PRES cascade interface and CBO–CBI daisy chain enable reliable scaling to ≥20-series packs without signal integrity loss. |
| Programmable overcurrent delays | OCDP pin accepts resistor to VSS to set OCD1/OCD2 delays (70 ms for BQ7791502), allowing design-specific transient rejection tuning. |
| Open-wire detection | 100-nA sink current configuration at VCx pins detects broken cell connections with 450–550 mV fault threshold and 100-mV hysteresis. |
Applications
| Power Tools | e-Bikes |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs operating at 36 V (10S) with aggressive charge/discharge cycles and thermal cycling. IC Role / Device Role / Timing Role: Primary protector executing autonomous OV/UV/OTD/OTC/OCD1/SCD decisions and passive balancing between charge cycles. Use Value: Prevents field failures from cell imbalance and thermal runaway while enabling 2-µA shipping mode to preserve SOC during warehouse storage. |
Use Scenario: 48-V (13S) e-bike battery with regenerative braking, high-current discharge pulses, and ambient temperature extremes. IC Role / Device Role / Timing Role: Standalone protector managing dual overcurrent thresholds (OCD1 for sustained overload, OCD2 for extreme surge) and load removal recovery. Use Value: Delivers 70-ms OCD1 response with 100% duty cycle balancing to maintain capacity consistency across 500+ charge cycles. |
| Robotic Vacuum Cleaners | Garden Tools |
|
Use Scenario: Compact 21-V (6S) vacuum battery with space-constrained PCB, frequent partial charging, and dust-induced thermal buildup. IC Role / Device Role / Timing Role: Ultra-low-power protector in HIBERNATE during idle periods; wakes autonomously on pack insertion or voltage rise. Use Value: Achieves <2 µA standby current to extend shelf life beyond 18 months without self-discharge degradation. |
Use Scenario: 40-V (11S) string trimmer battery subjected to vibration, moisture ingress, and rapid temperature swings in outdoor environments. IC Role / Device Role / Timing Role: Fault-tolerant protector with open-wire detection (100-nA sink) and robust TS/VTB thermistor interface for accurate OTD/UTD monitoring. Use Value: Ensures reliable disconnect under mechanical stress (e.g., connector fretting) by detecting >450 mV VCx–VCx−1 voltage drop within 4.5 s. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar primary battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7791501PW | OV = 4.250 V; UV = 2.800 V; OTC = 50°C; UTD = –20°C; OCD1 delay = 35 ms | Better suited for higher-voltage Li-ion cells (e.g., 4.35-V chemistries) and colder discharge environments. | Select BQ7791501PW when tighter UV margin and extended low-temp discharge capability are required. |
| BQ7791506PW | OV = 3.800 V; UV = 2.500 V; OCD1 delay = 50 ms; SCD delay = 300 µs; VHYST = 50 mV | Optimized for LFP or lower-voltage Li-ion cells; faster short-circuit response; reduced hysteresis improves precision. | Choose BQ7791506PW for LFP-based 24-V/36-V packs where lower OV/UV thresholds and sub-millisecond SCD response are critical. |
Compared with BQ7791502PW, BQ7791501PW offers higher OV/OTC thresholds for premium Li-ion, while BQ7791506PW provides lower OV/UV setpoints and faster SCD reaction for LFP-neither is pin-compatible, but all share identical TSSOP-24 footprint and stack interface logic.
Availability
BQ7791502PW is available at Aetrix Electronics and suitable for power tools, e-bikes, and robotic vacuum cleaner battery packs requiring stable component supply, long-term lifecycle support, and guaranteed traceability for ISO 13485 and IATF 16949 production programs.
Supply support for BQ7791502PW 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 and functional safety-compliant design.
The BQ77915 family is engineered for autonomous, microcontroller-free battery pack protection in consumer and industrial mobility applications-delivering ultra-low power operation, stackable scalability, and integrated cell balancing without host firmware dependency.
FAQ
What is the factory-programmed overvoltage threshold for BQ7791502PW?
The BQ7791502PW has a factory-programmed overvoltage threshold of 4.200 V ±10 mV at 25°C, with 200-mV hysteresis. This value is fixed and cannot be adjusted externally; it is optimized for standard 4.2-V Li-ion cells and verified across –40°C to +85°C operating range per TI SLUSCU0L datasheet Section 6.
Does BQ7791502PW support stacking for more than 5-series battery configurations?
Yes, BQ7791502PW supports stacking: a single device handles 3S–5S natively, and up to four BQ7791502PW units can be cascaded via LPWR–PRES and CBO–CBI interfaces to protect ≥6S packs (up to 20S). Each upper device's LPWR connects to the lower device's PRES, and CBO drives the next CBI-no external logic is required for coordination.
How is the 70-ms overcurrent discharge 1 (OCD1) delay set on BQ7791502PW?
The 70-ms OCD1 delay on BQ7791502PW is set by connecting a resistor from the OCDP pin to VSS. Per Table 6-1 and Section 8.5, this variant uses a 70-ms option; the exact resistor value is determined by the OCDP current–resistance relationship in the datasheet and must match TI's recommended tolerance (±1%) for timing accuracy.
Can BQ7791502PW perform cell balancing without an external microcontroller?
Yes, BQ7791502PW performs fully autonomous passive cell balancing using its integrated FETs-no MCU or firmware is needed. When CBI is pulled low, the device executes a smart algorithm that alternates balancing across odd/even cell groups every 521 ms, delivering up to 50 mA per cell with 100-mV hysteresis (VOV–VFC) to correct imbalance without external intervention.
What is the maximum absolute voltage rating per cell input on BQ7791502PW?
The BQ7791502PW has a 36-V absolute maximum rating on all cell voltage inputs (VC0–VC5), as specified in Section 8.1 Absolute Maximum Ratings. This allows safe operation with up to 5-series Li-ion (nominal 18.5 V, max 21 V) while providing robust margin against transients, ESD, and layout-induced spikes in high-vibration applications like power tools.
BQ7791502PW 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
BQ7791502PW FAQ
1.How can I place an order for BQ7791502PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7791502PW 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 BQ7791502PW reliable?
The price and inventory of BQ7791502PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7791502PW is usually 5 days.
3.What payment methods are accepted for BQ7791502PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7791502PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7791502PW?
BQ7791502PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7791502PW 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 BQ7791502PW?
For technical support, including BQ7791502PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7791502PW requirements.
6.How does Aetrix verify that BQ7791502PW is sourced from the original manufacturer or authorized distributors?
All BQ7791502PW 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 BQ7791502PW meets industry standards.
7.What is the process for return or replacement of BQ7791502PW?
All BQ7791502PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ7791502PW, 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 BQ7791502PW part is unused and in its original packaging.
Return procedure for BQ7791502PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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