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Texas Instruments BQ7791502PWR
- Part No.:
- BQ7791502PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7791502PWR.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,993
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Product details
Overview
BQ7791502PWR 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 without MCU intervention. It integrates independent CHG/DSG low-side NMOS drivers and smart passive cell balancing (up to 50 mA) for e-bike and power tool battery management.
For engineers reviewing the BQ7791502PWR datasheet, BQ7791502PWR pinout, BQ7791502PWR application, or BQ7791502PWR equivalent, this device delivers verified HIBERNATE mode (2 µA), factory-programmed protection thresholds (OV = 4.200 V, UV = 2.900 V), and scalable stack architecture supporting ≥6-series configurations via LPWR/PRES cascade - critical for high-voltage pack design and long-term storage compliance.
Technical Context
The BQ7791502PWR implements a fully autonomous protection architecture with dual overcurrent discharge thresholds (OCD1/OCD2), open-wire detection per cell, and resistor-programmable fault delays (e.g., OCD1 delay set via OCDP–VSS resistor). Its stackable interface uses LPWR–PRES signaling between devices to coordinate CHG/DSG control across series strings.
It features integrated FET drivers with defined on/off characteristics (VFETON = 11–14 V, RDSGOFF = 10–16 Ω), thermistor-based temperature sensing (10-kΩ NTC + VTB bias), and CCFG pin configuration for 3-/4-/5-cell topologies. The device operates from 3 V to 25 V supply and supports –40°C to +85°C ambient range with 88.9°C/W junction-to-ambient thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 8 µA typ. in NORMAL mode; enables multi-year shelf life in stored battery packs |
| HIBERNATE Current | 2 µA typ.; reduces self-discharge during shipping and long-term storage |
| Overvoltage Threshold | 4.200 V ±10 mV at 25°C; factory-programmed for precise cell-level safety cutoff |
| Undervoltage Threshold | 2.900 V ±18 mV at 25°C; prevents deep discharge damage in 3S–5S Li-ion packs |
| OCD1 Detection Range | –10 mV to –85 mV; sets discharge overcurrent limit based on sense resistor voltage drop |
| Cell Balancing Current | Up to 50 mA via internal FETs; corrects cell imbalance without external components |
| Operating Temperature | –40°C to +85°C; validated for power tools, e-bikes, and robotic vacuum environments |
| Package | TSSOP-24 (7.70 mm × 4.40 mm); surface-mount compatible with automated PCB assembly |
Pinout & Package
TSSOP-24 package (7.70 mm × 4.40 mm body size) with exposed thermal pad; rated for 36-V absolute maximum per cell input and optimized for compact battery pack PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3–25 V supply rail; powers analog/digital circuitry and FET drivers |
| VC0–VC5 | Cell voltage sense inputs | Differential monitoring of up to 6 cell voltages (supports 3S–5S via CCFG configuration) |
| SRP/SRN | Current sense differential inputs | Measures pack current via external sense resistor; enables OCD1/OCD2/SCD detection |
| CHG/DSG | Low-side FET driver outputs | Direct gate drive for external NMOS CHG/DSG switches; VFETON = 11–14 V |
| PRES | HIBERNATE mode control | Drive high for NORMAL operation; float for automatic entry into 2-µA HIBERNATE mode |
| LPWR | Stack communication output | Connects to PRES of lower device in stacked configuration; enables inter-device coordination |
| CBI/CBO | Cell balancing enable/control | CBI: low-active enable; CBO: drives upper device's CBI in stack; supports daisy-chained balancing |
| OCDP | OCD delay programming | Resistor to VSS sets OCD1/OCD2 fault detection delay (e.g., 70 ms for BQ7791502) |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous cell balancing | Integrated 50-mA balancing FETs with programmable hysteresis (VHYST = 50–200 mV) eliminate need for external controllers |
| Stackable architecture | LPWR–PRES cascade interface allows up to four BQ7791502PWR devices to protect ≥6-series packs without additional logic |
| Factory-configured protection | Fixed OV = 4.200 V, UV = 2.900 V, OTD = 65°C, OTC = 45°C - no configuration required for production deployment |
| Ultra-low power modes | HIBERNATE (2 µA) and SHUTDOWN (0.5 µA) reduce pack self-discharge during logistics and idle periods |
| Open-wire detection | Per-cell VCx monitoring with 450–550 mV fault threshold and 100-mV hysteresis ensures reliable interconnect integrity verification |
| Independent FET control | Separate CHG and DSG drivers allow asymmetric charge/discharge protection - critical for bidirectional energy flow in e-bikes |
Applications
| Power Tools | e-Bikes |
|---|---|
Use Scenario: Cordless drill/driver battery packs operating at 10.8 V–36 V with high pulse discharge currents. IC Role / Device Role / Timing Role: Primary protector enforcing cell-level OV/UV, OCD1/SCD, and OTD/OTC limits without host MCU supervision. Use Value: Prevents thermal runaway during stall events and extends cycle life via passive balancing of 3S–5S cells. |
Use Scenario: 36 V–48 V rear-hub or mid-drive e-bike battery packs requiring robust overtemperature and short-circuit protection. IC Role / Device Role / Timing Role: Autonomous protector managing CHG/DSG FETs and detecting open-wire faults across vibration-prone harnesses. Use Value: Enables safe regenerative braking support through independent CHG/DSG control and 65°C OTD cutoff. |
| Robotic Vacuum Cleaners | Garden Tools |
Use Scenario: Compact 22 V–36 V Li-ion packs powering brushless motors and navigation sensors in confined chassis. IC Role / Device Role / Timing Role: Low-power protector maintaining <8 µA quiescent draw during standby while enabling fast wake-up from HIBERNATE mode. Use Value: Extends shelf life and runtime by minimizing parasitic drain and correcting cell imbalance during charging cycles. |
Use Scenario: 40 V string trimmers and hedge trimmers subjected to outdoor temperature extremes and mechanical shock. IC Role / Device Role / Timing Role: Stackable protector coordinating multiple BQ7791502PWR units to monitor 6S–10S configurations with shared fault signaling. Use Value: Ensures consistent protection across high-series strings using only one part number and simplified layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7791501PWR | OV = 4.250 V, UV = 2.800 V, OTC = 50°C, OCD1 delay = 35 ms | Better suited for higher-temperature charge environments (e.g., industrial chargers) | Select when tighter OV tolerance and elevated OTC threshold are required for 4S Li-ion systems |
| BQ7791506PWR | OV = 3.800 V, UV = 2.500 V, OTD = 65°C, OCD1 delay = 50 ms, supports external balancing FETs only | Optimized for LFP chemistry with lower voltage thresholds and no internal balancing FETs | Choose for cost-sensitive LFP packs where external balancing control is acceptable and 3.8-V OV is mandatory |
Compared with BQ7791502PWR, BQ7791501PWR offers higher OV/OTC thresholds for enhanced margin in warm environments, while BQ7791506PWR provides lower voltage thresholds and external-only balancing for LFP compatibility - neither matches BQ7791502PWR's 4.200-V OV + internal 50-mA balancing combination for standard NMC 3S–5S e-bike packs.
Availability
BQ7791502PWR is available at Aetrix Electronics and suitable for power tools, e-bikes, and robotic vacuum cleaner designs requiring stable component supply, long-term lifecycle support, and automotive-grade reliability under thermal cycling and vibration stress.
Supply support for BQ7791502PWR 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 battery management system expertise.
The BQ77915 family is designed for autonomous, ultra-low-power primary protection of multi-cell Li-ion/Li-polymer battery packs in consumer and industrial portable equipment - eliminating MCU dependency while delivering precision, scalability, and functional safety readiness.
FAQ
What is the factory-programmed overvoltage threshold for BQ7791502PWR?
The BQ7791502PWR has a factory-programmed overvoltage threshold of 4.200 V ±10 mV at 25°C, as confirmed in Table 6-1 of the datasheet. This value is fixed and non-adjustable, ensuring consistent cell-level protection across production units without calibration. The BQ7791502PWR also includes 200-mV hysteresis to prevent oscillation near the trip point.
How does BQ7791502PWR enter HIBERNATE mode and what is its current draw?
BQ7791502PWR enters HIBERNATE mode when the PRES pin is left floating, triggering an internal deglitch timer (tPRES_DEG_ENT = 4.5 s). In this state, the device draws 2 µA typical quiescent current, reducing self-discharge during shipping and long-term storage. The LPWR pin remains active to communicate with lower-stack devices but contributes minimally to total current.
Can BQ7791502PWR support more than 5-series battery configurations?
Yes - BQ7791502PWR supports ≥6-series configurations via stacking: up to four devices can be cascaded using LPWR→PRES connections to protect up to 20-series packs. Each BQ7791502PWR monitors up to 5 cells (via VC0–VC5), and stack coordination preserves individual fault reporting and CHG/DSG control per segment without host intervention.
What is the maximum cell-balancing current provided by BQ7791502PWR?
The BQ7791502PWR delivers up to 50 mA of cell-balancing current using its integrated internal FETs, as specified in Section 8.5 (Cell Balancing) and Feature List. This current is sufficient for passive balancing in 3S–5S NMC packs; for higher currents, external FETs can be driven via CBO/CBI pins while retaining algorithm control.
Does BQ7791502PWR require external components for basic operation?
Yes - BQ7791502PWR requires external components for core functions: a current-sense resistor (RSNS) for OCD/SCD detection, 10-kΩ NTC thermistor + VTB bias for temperature monitoring, and optional resistors on OCDP (for delay tuning) and RLD (for load removal detection). However, no MCU, EEPROM, or configuration firmware is needed - all protection parameters are factory-programmed.
BQ7791502PWR 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/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
BQ7791502PWR FAQ
1.How can I place an order for BQ7791502PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7791502PWR 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 BQ7791502PWR reliable?
The price and inventory of BQ7791502PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7791502PWR is usually 5 days.
3.What payment methods are accepted for BQ7791502PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7791502PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7791502PWR?
BQ7791502PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7791502PWR 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 BQ7791502PWR?
For technical support, including BQ7791502PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7791502PWR requirements.
6.How does Aetrix verify that BQ7791502PWR is sourced from the original manufacturer or authorized distributors?
All BQ7791502PWR 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 BQ7791502PWR meets industry standards.
7.What is the process for return or replacement of BQ7791502PWR?
All BQ7791502PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7791502PWR, 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 BQ7791502PWR part is unused and in its original packaging.
Return procedure for BQ7791502PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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