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Texas Instruments BQ7791506PWR
- Part No.:
- BQ7791506PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7791506PWR.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,798
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Product details
Overview
BQ7791506PWR 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: –2500 mV threshold), and temperature (OTD: 65°C, OTC: 50°C) protections without MCU control. It integrates independent CHG/DSG low-side NMOS drivers and smart passive cell balancing (50 mA max) for e-bike and power tool battery management.
For engineers reviewing the BQ7791506PWR datasheet, BQ7791506PWR pinout, BQ7791506PWR application, or BQ7791506PWR equivalent, key selection criteria include its factory-programmed 3.8 V overvoltage threshold with 200 mV hysteresis, 50 ms OCD1 delay, load-removal recovery capability, and TSSOP-24 package compatibility with stacked multi-device architectures up to 20-series cells.
Technical Context
The BQ7791506PWR implements a state-comparator-based protection architecture with dual overcurrent discharge thresholds (OCD1 at –2500 mV, OCD2 at –3500 mV) and programmable delays via external resistor on OCDP pin. Its HIBERNATE mode enables shipping/storage with only 2 µA quiescent current, while PRES/LPWR pins coordinate stack-level wake-up sequencing.
Cell balancing operates autonomously using integrated FETs with 50-mA max current and 50-mV step resolution between VCBTH and VCBTL; CBI/CBO pins support cascaded balancing across stacked devices. Protection logic uses filtered fault detection with de-glitching (e.g., 100 ms CBI deglitch, 4.5 s PRES entry deglitch) and separate charge/discharge temperature thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 3.800 V ±10 mV - factory-programmed trip point for cell-level overvoltage shutdown with 200 mV hysteresis to prevent chatter during recovery. |
| Undervoltage Threshold | 2.500 V ±18 mV - fixed UV cutoff preventing deep discharge in 3–5S Li-ion packs; supports load-removal recovery. |
| OCD1 Threshold | –2500 mV - calibrated current-sense comparator level triggering first-level discharge overcurrent protection with 50-ms delay. |
| HIBERNATE Current | 2 µA typical - ultra-low standby power enabling long-term storage without pack drain; entered by floating PRES pin. |
| Cell Balancing Current | 50 mA max - internal FET-driven passive balancing per cell, configurable via VSTEP (50 mV) and VHYST (100 mV) settings. |
| Operating Temp Range | –40°C to +85°C - specified performance across industrial temperature range for power tools and e-bikes. |
| Package | TSSOP-24 (7.7 mm × 4.4 mm) - surface-mount footprint supporting high-density battery pack PCB layouts with thermal pad exposure. |
Pinout & Package
TSSOP-24 package with exposed thermal pad; 0.65 mm pitch; 7.70 mm × 4.40 mm body size; RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply input / analog ground | VDD accepts 3–25 V; VSS serves as reference for all VCx, SRP/SRN, and TS inputs; requires local 1-µF CVDD capacitor. |
| VC0–VC5 | Cell voltage sense inputs | Differential sensing of up to 6 cell voltages (3–5S config); VC0 = pack–, VC5 = top cell+; open-wire detection enabled. |
| SRP / SRN | Current sense differential inputs | Connect across sense resistor; SRP to battery side, SRN to pack side; enables OCD1/OCD2/SCD detection with ±20% accuracy. |
| CHG / DSG | Low-side NMOS FET gate drivers | Drive external N-channel FETs; VFETON = 11–14 V (VDD ≥12 V); RDSGOFF = 10–16 Ω ensures robust off-state isolation. |
| PRES / LPWR | HIBERNATE mode control / stack communication | PRES high = NORMAL mode; floating = HIBERNATE; LPWR connects to lower device's PRES for synchronized wake-up in stacks. |
| CBI / CBO | Cell balancing enable / cascade output | CBI low = enable balancing; CBO drives upper device's CBI via 10-kΩ resistor; supports daisy-chained balancing across stacks. |
| OCDP | OCD delay programming | Resistor to VSS sets OCD1/OCD2 delay (50 ms for BQ7791506); 10-MΩ used for upper devices in stack. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous cell balancing | Integrated 50-mA FETs with 50-mV step resolution (VCBTH–VCBTL) and 100-mV hysteresis (VOV–VFC) eliminate need for external balancing controllers. |
| Stackable architecture | Supports 3–5S standalone operation; up to four devices cascade via PRES/LPWR and CBI/CBO to protect 6–20S packs without host intervention. |
| Load-removal recovery | Enables automatic UV recovery after external load removal, critical for cordless power tools where temporary overload causes false UV trips. |
| HIBERNATE mode | Reduces quiescent current to 2 µA by disabling all comparators and drivers; wake-up triggered by pulling PRES high through external circuitry. |
| Factory-programmed protection | Fixed OV/UV thresholds, OCD delays, and temperature setpoints eliminate configuration firmware or external resistors for basic deployment. |
Applications
| Power Tools | e-Bikes |
|---|---|
Use Scenario: Cordless drill/driver operating at 18–36 V with intermittent high-current bursts (>30 A). IC Role / Device Role / Timing Role: Primary protector enforcing 3.8 V OV, 2.5 V UV, and –2500 mV OCD1 with 50-ms delay to tolerate motor startup surges. Use Value: Prevents cell damage during stall conditions while enabling load-removal UV recovery when trigger is released. |
Use Scenario: 36–48 V e-bike battery pack subjected to regenerative braking and hill-climb currents. IC Role / Device Role / Timing Role: Stackable protector managing 10–13S configurations; balances cells autonomously to extend cycle life beyond 500 cycles. Use Value: Maintains ≤50 mV cell-to-cell variance under 2C cycling, reducing pack degradation and improving range consistency. |
| Robotic Vacuum Cleaners | Garden Tools |
Use Scenario: Compact 22–36 V robotic vacuum with space-constrained PCB and thermal constraints. IC Role / Device Role / Timing Role: Ultra-low-power protector (2 µA HIBERNATE) enabling months of shelf storage without capacity loss. Use Value: Eliminates need for external wake-up circuitry; PRES pin float entry reduces BOM count and layout complexity. |
Use Scenario: 40 V string trimmer/mower battery exposed to outdoor temperature extremes (–20°C to +70°C). IC Role / Device Role / Timing Role: Dual-temperature protection with OTC = 50°C and OTD = 65°C prevents charging in freezing temps and discharging in hot garages. Use Value: Avoids lithium plating during cold-weather charging and thermal runaway during summer storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7791508PWR | Higher OV threshold (4.2 V), longer OCD1 delay (1420 ms), –20°C UTD, and 500-ms fault recovery. | Better suited for high-voltage 13S e-bike packs requiring extended overcurrent tolerance and cold-weather discharge. | Select BQ7791508PWR when 4.2 V OV headroom and cold-temperature discharge down to –20°C are required. |
| BQ7791514PWR | Lower OV threshold (3.65 V), tighter SCD threshold (–200 mV), and 50-ms OCD1 delay identical to BQ7791506PWR. | Optimized for LFP or high-precision Li-ion chemistries needing conservative overvoltage margins and fast short-circuit response. | Choose BQ7791514PWR for LFP packs or designs requiring faster SCD tripping without changing OCD timing. |
Compared with BQ7791506PWR, BQ7791508PWR offers greater overvoltage margin and cold-temperature operation but sacrifices fast OCD response, while BQ7791514PWR provides tighter SCD sensitivity and lower OV for safer LFP use-neither is pin-compatible, requiring layout revision for substitution.
Availability
BQ7791506PWR 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 consistent factory-programmed protection thresholds.
Supply support for BQ7791506PWR 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 delivers autonomous, stackable primary protection for consumer and industrial Li-ion packs-designed to eliminate MCU dependency while ensuring safety, longevity, and manufacturability in cost-sensitive portable equipment.
FAQ
What is the overvoltage protection threshold for BQ7791506PWR?
The BQ7791506PWR has a factory-programmed overvoltage threshold of 3.800 V ±10 mV per cell, with 200 mV hysteresis to prevent oscillation during recovery. This value is fixed and cannot be adjusted externally, making it ideal for standardized 3–5S Li-ion packs where consistent voltage cutoff is critical for cell longevity.
Does BQ7791506PWR support stacking for higher cell counts?
Yes, BQ7791506PWR supports stacking: a single device handles 3–5S configurations, and up to four devices can be cascaded using PRES/LPWR and CBI/CBO pins to protect 6–20S battery packs. Each upper device's LPWR connects to the lower device's PRES, enabling synchronized HIBERNATE entry and exit across the stack.
How does the cell balancing function work on BQ7791506PWR?
BQ7791506PWR performs autonomous passive cell balancing using integrated FETs delivering up to 50 mA per cell. Balancing activates when cell voltage exceeds VCBTH (set by VSTEP = 50 mV steps), with hysteresis (VHYST = 100 mV) preventing chatter. CBI/CBO pins allow daisy-chained balancing across stacked devices without external control.
What is the quiescent current of BQ7791506PWR in HIBERNATE mode?
The BQ7791506PWR draws 2 µA typical quiescent current in HIBERNATE mode-achieved by floating the PRES pin-making it suitable for long-term storage of battery packs. This ultra-low power state disables all protection comparators and drivers while retaining the ability to wake via external pull-up on PRES.
Can BQ7791506PWR recover from undervoltage faults automatically?
Yes, BQ7791506PWR supports load-removal recovery for undervoltage faults: when the pack load is disconnected, the device monitors cell voltage and automatically re-enables the DSG FET once all cells rise above the 2.500 V UV threshold plus hysteresis, eliminating manual reset requirements in power tools and vacuums.
BQ7791506PWR 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
BQ7791506PWR FAQ
1.How can I place an order for BQ7791506PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7791506PWR 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 BQ7791506PWR reliable?
The price and inventory of BQ7791506PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7791506PWR is usually 5 days.
3.What payment methods are accepted for BQ7791506PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7791506PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7791506PWR?
BQ7791506PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7791506PWR 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 BQ7791506PWR?
For technical support, including BQ7791506PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7791506PWR requirements.
6.How does Aetrix verify that BQ7791506PWR is sourced from the original manufacturer or authorized distributors?
All BQ7791506PWR 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 BQ7791506PWR meets industry standards.
7.What is the process for return or replacement of BQ7791506PWR?
All BQ7791506PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7791506PWR, 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 BQ7791506PWR part is unused and in its original packaging.
Return procedure for BQ7791506PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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