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Texas Instruments BQ7791500PWR
- Part No.:
- BQ7791500PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7791500PWR.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,050
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Product details
Overview
BQ7791500PWR from Texas Instruments is a stackable ultra-low power primary protector IC for 3- to 5-series Li-ion/Li-polymer battery packs, delivering autonomous cell balancing, HIBERNATE mode (2 µA), ±10 mV overvoltage accuracy, and independent CHG/DSG FET drivers - deployed in e-bike and power tool battery management systems.
For engineers reviewing the BQ7791500PWR datasheet, BQ7791500PWR pinout, BQ7791500PWR application, or BQ7791500PWR equivalent, key selection criteria include factory-programmed protection thresholds (OV=4.2 V, UV=2.9 V), TSSOP-24 package compatibility, 36-V absolute max per cell input, and support for scalable stacking up to 20-series configurations.
Technical Context
The BQ7791500PWR implements a fully autonomous protection architecture with no MCU required: voltage (OV/UV), current (OCD1/OCD2/SCD), temperature (OTC/OTD/UTC/UTD), and open-wire detection are all handled internally using factory-trimmed thresholds and resistor-programmable delays. Its stackable interface uses LPWR/PRES signaling and CBO/CBI daisy-chaining to coordinate multi-device operation.
It integrates smart passive cell balancing with internal 50-mA FETs and supports external FETs for higher balancing current; HIBERNATE mode disables all protections except wake-up logic, reducing quiescent current to 2 µA while retaining state retention via VDD-supplied bias. The device operates across –40°C to +85°C with 3-V to 25-V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 8 µA (NORMAL), 2 µA (HIBERNATE) - enables multi-year shelf life in shipped battery packs without compromising protection readiness |
| Overvoltage Threshold | 4.200 V ±10 mV - factory-programmed for precise cell-level safety margin at full charge |
| Undervoltage Threshold | 2.900 V ±18 mV - prevents deep discharge damage in high-drain applications like robotic vacuums |
| Cell Balancing Current | Up to 50 mA (internal FETs) - corrects cell-to-cell imbalance autonomously without host intervention |
| Stacking Support | 3–5 series per device; up to 20+ series via daisy-chain - eliminates need for custom firmware in multi-cell BMS designs |
| Protection Delay Config | Resistor-programmable OCD1/OCD2 delays (e.g., 60 ms default) - allows tuning response time to match pack impedance and load profile |
| Thermal Protection | OTD = 65°C / OTC = 45°C with 10-kΩ NTC bias - provides differentiated charge/discharge thermal cutoff for safe fast-charging cycles |
Pinout & Package
TSSOP-24 package (7.70 mm × 4.40 mm), 0.65-mm pitch, exposed thermal pad; designed for compact, thermally efficient PCB layout in space-constrained battery modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and analog ground | Primary power domain for internal logic and sensing; requires local 1-µF ceramic decoupling |
| VC0–VC5 | Cell voltage sense inputs | Measure individual cell voltages across 3–5 series cells; support open-wire fault detection on each node |
| SRP/SRN | Differential current sense inputs | Monitor pack current via external sense resistor; enable OCD1/OCD2/SCD protection with ±10% threshold accuracy |
| CHG/DSG | Low-side NMOS FET drivers | Directly control external charge/discharge FETs; 12-V typical gate drive ensures robust turn-on under low-VDD conditions |
| CBI/CBO | Cell balancing enable/control | CBI enables balancing per device; CBO signals upper-tier devices in stacked configuration - enables coordinated balancing across stacks |
| PRES/LPWR | HIBERNATE mode control | PRES high = NORMAL mode; floating = HIBERNATE; LPWR connects to lower device's PRES for inter-device wake coordination |
| CTRC/CTRD | FET override control inputs | Allow external host or cascaded device to force CHG/DSG state override - critical for system-level fault escalation |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous cell balancing | Integrated 50-mA balancing FETs with programmable hysteresis (50–200 mV) eliminate need for external balancing controllers |
| HIBERNATE mode | 2-µA quiescent current with PRES-controlled entry/exit - extends shelf-life of pre-charged battery packs without manual reset |
| Stackable architecture | LPWR/PRES and CBO/CBI daisy-chain interface enables seamless expansion from 3- to 20+-series without redesigning protection logic |
| Factory-programmed thresholds | Fixed OV=4.200 V, UV=2.900 V, OTD=65°C, OTC=45°C - removes calibration burden and ensures consistent safety compliance across production lots |
| Independent CHG/DSG drivers | Dual low-side gate drivers support asymmetric protection (e.g., disable charging while permitting discharge during thermal faults) |
Applications
| Power Tools | e-Bikes |
|---|---|
|
Use Scenario: Cordless drill/driver packs subject to high pulse currents (>30 A) and rapid thermal cycling during burst operation. IC Role / Device Role / Timing Role: Primary protector enforcing OV/UV limits, detecting short-circuit discharge within 400 µs, and balancing cells post-charge to maintain capacity consistency across 10.8–36-V packs. Use Value: Prevents field failures from cell reversal or thermal runaway; extends usable cycle life by >15% through active balancing. |
Use Scenario: Mid-drive e-bike battery packs requiring UL 2271 compliance, overtemperature shutdown during hill climbs, and state-of-charge maintenance during storage. IC Role / Device Role / Timing Role: Standalone protector managing 13–17 series Li-ion cells, triggering OTD=65°C cutoff, entering HIBERNATE during 6-month warehouse storage. Use Value: Eliminates need for microcontroller-based BMS in cost-sensitive OEM designs while meeting IEC 62133 safety requirements. |
| Robotic Vacuum Cleaners | Garden Tools |
|
Use Scenario: Compact 3–4 series packs in autonomous floor cleaners with frequent partial charges and vibration-induced connector fatigue. IC Role / Device Role / Timing Role: Detects open-wire faults on VCx nodes within 4.5 s, enforces UV=2.9 V cutoff to avoid deep discharge during overnight mapping runs. Use Value: Reduces warranty returns from undetected cell disconnection by enabling early fault flagging before pack failure. |
Use Scenario: High-voltage (54–72 V) cordless string trimmers/mowers with aggressive discharge profiles and ambient temperatures up to 60°C. IC Role / Device Role / Timing Role: Scales to 15–20 series via stacked BQ7791500PWR devices; coordinates DSG FET shutdown across tiers during OCD2 events. Use Value: Enables single-IC-family scalability across product lines - reduces qualification effort and inventory complexity for multi-platform BMS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar primary battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7791501PWR | OV=4.250 V, OTC=50°C, UTD=–20°C - tighter thermal thresholds and higher overvoltage setpoint | Better suited for high-temperature environments (e.g., outdoor power equipment) requiring extended charge window | Select when pack chemistry tolerates 4.25-V charge ceiling and ambient operating range exceeds 55°C |
| BQ7791502PWR | Identical OV/UV thresholds to BQ7791500PWR but with 70-ms OCD1 delay (vs. 60 ms) and same thermal thresholds | Provides longer transient tolerance before discharge cutoff - beneficial for high-inrush motor loads | Choose for applications with brief current spikes (e.g., brushless motor startup) where false OCD1 trips must be minimized |
Compared with BQ7791501PWR and BQ7791502PWR, the BQ7791500PWR offers the most widely adopted threshold configuration (4.200 V OV, 65°C OTD) for standard NMC cells, making it ideal for volume production of 10.8–36-V consumer battery packs where design reuse and supply chain stability are prioritized.
Availability
BQ7791500PWR 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 automotive-grade reliability without MCU dependency.
Supply support for BQ7791500PWR 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 solutions.
The BQ77915 family is designed for cost-sensitive, high-volume battery packs needing autonomous, ultra-low-power protection - targeting consumer, industrial, and light electric vehicle applications where simplicity and safety certification are critical.
FAQ
What is the factory-programmed overvoltage threshold for BQ7791500PWR?
The BQ7791500PWR has a factory-programmed overvoltage threshold of 4.200 V ±10 mV at 25°C, optimized for standard NMC and NCA lithium-ion cells. This value is laser-trimmed during manufacturing and cannot be adjusted in-system. The BQ7791500PWR datasheet specifies this as a fixed parameter with guaranteed accuracy across –40°C to +85°C operating range.
Does BQ7791500PWR support stacking beyond 5-series cell configurations?
Yes - the BQ7791500PWR supports scalable stacking: a single device handles 3–5 series cells, and up to four devices can be daisy-chained via LPWR/PRES and CBO/CBI pins to protect up to 20-series configurations. Each added device extends the voltage monitoring range by its supported cell count, maintaining autonomous operation without host controller involvement.
How does HIBERNATE mode function on BQ7791500PWR?
HIBERNATE mode on BQ7791500PWR reduces quiescent current to 2 µA by disabling all protection functions except wake-up circuitry. It activates when the PRES pin is left floating and exits when PRES is driven above 1.5 V. During HIBERNATE, the device retains configuration state and resumes full protection within 10 ms of wake signal - critical for battery pack shipping and long-term storage.
Can BQ7791500PWR perform cell balancing without external components?
Yes - the BQ7791500PWR integrates internal FETs capable of up to 50 mA balancing current per cell, requiring only external RC filters (RINI = 33 Ω, CINI = 1 µF) per channel. No external balancing FETs or driver circuitry are needed for standard applications; external FETs are optional only when >50 mA balancing current is required.
What package type and footprint does BQ7791500PWR use?
The BQ7791500PWR uses a TSSOP-24 package with nominal body dimensions of 7.70 mm × 4.40 mm and 0.65-mm lead pitch. It features an exposed thermal pad for enhanced heat dissipation and is compatible with standard reflow soldering processes. The pinout is documented in TI's SLUSCU0L datasheet Figure 7-1 and Table 7-1.
BQ7791500PWR 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
BQ7791500PWR FAQ
1.How can I place an order for BQ7791500PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7791500PWR 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 BQ7791500PWR reliable?
The price and inventory of BQ7791500PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7791500PWR is usually 5 days.
3.What payment methods are accepted for BQ7791500PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7791500PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7791500PWR?
BQ7791500PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7791500PWR 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 BQ7791500PWR?
For technical support, including BQ7791500PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7791500PWR requirements.
6.How does Aetrix verify that BQ7791500PWR is sourced from the original manufacturer or authorized distributors?
All BQ7791500PWR 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 BQ7791500PWR meets industry standards.
7.What is the process for return or replacement of BQ7791500PWR?
All BQ7791500PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7791500PWR, 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 BQ7791500PWR part is unused and in its original packaging.
Return procedure for BQ7791500PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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