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Texas Instruments BQ7791501PWT
- Part No.:
- BQ7791501PWT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7791501PWT.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,145
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Product details
Overview
BQ7791501PWT 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: –10 to –85 mV; SCD: –40 to –340 mV), and temperature (OTD: 70°C; OTC: 50°C) protections without MCU control. It integrates smart passive cell balancing (up to 50 mA) and HIBERNATE mode (2 µA), targeting e-bikes and power tools.
For engineers reviewing the BQ7791501PWT datasheet, BQ7791501PWT pinout, BQ7791501PWT application, or BQ7791501PWT equivalent, key selection criteria include its factory-programmed 4.25 V overvoltage threshold, 2.8 V undervoltage threshold, 70°C/50°C discharge/charge overtemperature thresholds, load-removal–based fault recovery, and TSSOP-24 package compatibility with stacked multi-device configurations.
Technical Context
The BQ7791501PWT operates as a standalone analog protection controller with no firmware or host interface required. Its protection logic uses dedicated comparators for OV/UV/OW/OCD/SCD/OT/UT, with all thresholds factory-trimmed and resistor-programmable delays (e.g., OCD1 delay set via OCDP-to-VSS resistor).
It implements dual independent low-side NMOS FET drivers (CHG/DSG) with 11–14 V turn-on voltage and sub-15 µs fall times, plus integrated cell balancing FETs (8–20 Ω RBAL) enabling 50-mA balancing current per cell. The device supports cascaded stacking via LPWR/PRES/CTRC/CTRD pins for ≥6-series configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4.25 V ±10 mV at 25°C - sets precise full-charge cutoff for 5S Li-ion packs (21.25 V total) |
| Undervoltage Threshold | 2.80 V ±18 mV at 25°C - prevents deep discharge of individual cells in 3S–5S configurations |
| HIBERNATE Current | 2 µA typical - enables multi-year shelf life during battery storage/transport without pack drain |
| Cell Balancing Current | Up to 50 mA per cell - corrects voltage drift between series cells using internal FETs, eliminating need for external balancing circuits |
| Overtemperature Discharge | 70°C with 10°C hysteresis - shuts down discharge path when cell temperature exceeds safe operating limit under load |
| Short-Circuit Delay | 400 µs or 960 µs option - provides ultra-fast response to hard shorts while avoiding false triggers from transient spikes |
| Stacking Support | Up to 4 devices for ≥20S - enables scalable protection architecture without redesigning core circuitry |
Pinout & Package
TSSOP-24 package (7.70 mm × 4.40 mm), 0.65 mm pitch, thermally enhanced for battery-pack PCB layouts requiring minimal footprint and reliable thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply input and analog ground | Accepts 3–25 V input; VSS serves as reference for all cell voltage and current sense measurements |
| VC0–VC5 | Cell voltage sense inputs | Measure individual cell voltages across up to 5 series cells; support open-wire detection on each node |
| SRP, SRN | Current sense differential inputs | Monitor pack current via external sense resistor; enable OCD1/OCD2/SCD protection with programmable thresholds |
| CHG, DSG | Low-side N-channel FET gate drivers | Drive external MOSFETs to disconnect charge/discharge paths independently; 11–14 V output swing ensures robust FET turn-on |
| CBI, CBO | Cell balancing control I/O | CBI enables balancing (low-active); CBO outputs signal to upper device's CBI in stacked configuration |
| PRES, LPWR | HIBERNATE mode interface | PRES high = NORMAL mode; floating = HIBERNATE; LPWR connects to lower device's PRES for inter-device wake coordination |
| OCDP | OCD delay programming input | Resistor to VSS sets OCD1/OCD2 fault detection delay (e.g., 20 ms for BQ7791501) |
| CCFG | Cell count configuration input | Resistive divider selects 3S/4S/5S operation; floating = 5S default |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous cell balancing | Integrated 50-mA balancing FETs per cell with 100-mV hysteresis and 521-ms group duration eliminate need for external balancing ICs or controllers |
| Factory-programmed protection | No configuration required - OV=4.25 V, UV=2.80 V, OTD=70°C, OTC=50°C, OCD1 delay=20 ms are fixed at wafer level |
| Load-removal fault recovery | Automatic reset after load removal for OCD1/OCD2/SCD faults - avoids manual intervention or host MCU involvement |
| Ultra-low power HIBERNATE | 2 µA quiescent current with full protection retention - extends battery shelf life without compromising safety readiness |
| Stackable cascade interface | LPWR/PRES/CTRC/CTRD pins enable daisy-chained multi-device stacks with synchronized HIBERNATE entry/exit and CHG/DSG override |
Applications
| Power Tools | e-Bikes |
|---|---|
|
Use Scenario: Cordless drill/driver packs subject to high pulse currents (>30 A) and repeated charge/discharge cycles. IC Role / Device Role / Timing Role: Primary protector enforcing cell-level OV/UV/OT/SCD limits and enabling passive balancing to maintain capacity consistency across 5S packs. Use Value: Prevents field failures from cell imbalance-induced overvoltage during charging and thermal runaway during high-load discharge. |
Use Scenario: 48-V (13S) e-bike battery packs requiring scalable protection with minimal BOM cost. IC Role / Device Role / Timing Role: Stackable protector - one BQ7791501PWT handles bottom 5S, cascaded to upper devices covering remaining cells. Use Value: Enables modular pack design with identical BOM across 3S–20S configurations, reducing qualification effort and inventory complexity. |
| Robotic Vacuum Cleaners | Garden Tools |
|
Use Scenario: Compact 3S/4S Li-ion packs in autonomous floor cleaners with strict size and self-discharge constraints. IC Role / Device Role / Timing Role: Standalone protector providing HIBERNATE mode (2 µA) and accurate UV cutoff (2.80 V) to prevent capacity loss during idle periods. Use Value: Extends shelf life and operational cycle count by eliminating microcontroller dependency and minimizing standby current. |
Use Scenario: 36-V (10S) string trimmer or hedge trimmer packs exposed to outdoor temperature extremes (–20°C to 70°C). IC Role / Device Role / Timing Role: Dual-temperature threshold protector - UTD=–20°C disables discharge; UTC=0°C disables charge to prevent lithium plating. Use Value: Ensures safe operation across seasonal environments without requiring external temperature monitoring or firmware adaptation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar primary battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7791500PWT | OV=4.20 V, UV=2.90 V, OTD=65°C, OTC=45°C, OCD1 delay=180 ms | Better suited for conservative 4S packs where tighter OV margin and lower OT thresholds reduce thermal stress | Select when prioritizing longer cell life over peak power delivery in moderate-temperature environments |
| BQ7791502PWT | OV=4.20 V, UV=2.90 V, OTD=65°C, OTC=45°C, OCD1 delay=70 ms | Offers faster overcurrent response than BQ7791501PWT while retaining same OV/UV thresholds | Choose for high-dynamic-load applications like cordless saws where rapid OCD1 response prevents FET failure |
Compared with BQ7791500PWT and BQ7791502PWT, the BQ7791501PWT provides the highest overtemperature discharge threshold (70°C) and shortest standard OCD1 delay (20 ms), making it optimal for high-power, high-ambient-temperature applications where thermal headroom and fast fault clearing are critical.
Availability
BQ7791501PWT is available at Aetrix Electronics and suitable for e-bikes, power tools, and robotic vacuum cleaners requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for industrial battery pack production.
Supply support for BQ7791501PWT 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 cost-sensitive, high-volume portable Li-ion battery packs requiring zero-host-control protection, ultra-low standby power, and scalable multi-cell architectures - targeting power tools, e-mobility, and consumer robotics.
FAQ
What is the overvoltage protection threshold of the BQ7791501PWT?
The BQ7791501PWT has a factory-programmed overvoltage threshold of 4.25 V ±10 mV at 25°C. This value is trimmed during manufacturing and cannot be adjusted externally. It applies to each monitored cell in 3S–5S configurations and remains stable across –40°C to +85°C operating temperature, with accuracy degrading to ±40 mV at temperature extremes. The BQ7791501PWT uses this threshold to disable the DSG FET and halt discharge when any cell exceeds 4.25 V.
Does the BQ7791501PWT require a microcontroller to operate?
No, the BQ7791501PWT operates autonomously without any microcontroller or firmware. All protection functions - including voltage, current, temperature, and open-wire detection - are implemented in analog hardware with factory-programmed thresholds and delays. The BQ7791501PWT only requires passive components (resistors, capacitors, thermistor) and external MOSFETs to function as a complete primary protector in standalone battery packs.
How does cell balancing work on the BQ7791501PWT?
The BQ7791501PWT implements smart passive cell balancing using integrated FETs that discharge higher-voltage cells through external resistors. It balances odd- and even-numbered cells in alternating 521-ms intervals, with balancing triggered when cell voltage exceeds VCBTH (set by VHYST and VSTEP). The BQ7791501PWT delivers up to 50 mA per cell, and supports external FETs for higher balancing currents. No configuration or host interaction is needed.
What is the purpose of the PRES and LPWR pins on the BQ7791501PWT?
The PRES pin controls HIBERNATE mode: driven high (>1.5 V) for NORMAL operation, left floating for HIBERNATE. The LPWR pin communicates HIBERNATE status to lower devices in a stack - connected to the PRES pin of the device below. In a single-device configuration, LPWR is left unconnected. Both pins use deglitch timers (4.5 s entry, 10 ms exit) to prevent spurious mode transitions from noise.
Can the BQ7791501PWT be used in a 6-series or higher battery pack?
Yes, the BQ7791501PWT supports ≥6-series configurations via stacking: up to four devices can be cascaded using LPWR/PRES/CTRC/CTRD pins to protect up to 20-series packs. Each device monitors up to 5 cells; higher counts require inter-device coordination of CHG/DSG signals and shared thermistor/temperature thresholds. The BQ7791501PWT's stackable interface eliminates the need for additional level-shifting or isolation circuitry.
BQ7791501PWT 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
BQ7791501PWT FAQ
1.How can I place an order for BQ7791501PWT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7791501PWT 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 BQ7791501PWT reliable?
The price and inventory of BQ7791501PWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7791501PWT is usually 5 days.
3.What payment methods are accepted for BQ7791501PWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7791501PWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7791501PWT?
BQ7791501PWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7791501PWT 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 BQ7791501PWT?
For technical support, including BQ7791501PWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7791501PWT requirements.
6.How does Aetrix verify that BQ7791501PWT is sourced from the original manufacturer or authorized distributors?
All BQ7791501PWT 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 BQ7791501PWT meets industry standards.
7.What is the process for return or replacement of BQ7791501PWT?
All BQ7791501PWT units undergo pre-shipment inspection (PSI). If there is an issue with BQ7791501PWT, 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 BQ7791501PWT part is unused and in its original packaging.
Return procedure for BQ7791501PWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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