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Texas Instruments BQ7790511PW
- Part No.:
- BQ7790511PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7790511PW.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,931
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Product details
Overview
BQ7790511PW from Texas Instruments is a 5-cell stackable lithium-ion battery protector IC implementing factory-programmed voltage, current, temperature, and open-wire protections without MCU control. It delivers ±10 mV overvoltage/undervoltage accuracy, 120 mV overcurrent discharge 2 threshold, 280 mV short-circuit discharge threshold, and supports 3–5 series cell configurations in TSSOP-20 package for power tool battery packs.
For engineers reviewing the BQ7790511PW datasheet, BQ7790511PW pinout, BQ7790511PW application, or BQ7790511PW equivalent, key selection criteria include its 1-µA shutdown current, 6 µA normal-mode quiescent current, programmable 65°C/45°C overtemperature thresholds, and cascaded CHG/DSG driver architecture enabling scalable protection up to 20-series stacks.
Technical Context
The BQ7790511PW integrates independent low-side NMOS FET drivers for charge (CHG) and discharge (DSG) control with external override inputs (CTRC/CTRD) enabling hierarchical stacking. Its protection logic uses internal delay timers for all faults-OV, UV, OCD1/OCD2, SCD, OTD/OTC, UTD/UTC-and includes built-in self-test functions for functional safety compliance.
Cell voltage sensing occurs across five VCx pins (VC1–VC5), while current sensing uses differential SRP/SRN inputs referenced to PACK–. Temperature monitoring relies on an NTC thermistor connected between TS and VSS, biased by VTB, with thresholds expressed as percentage ratios of VTB voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Normal Mode Current | 6 µA - enables ultra-low-power operation in active protection state without compromising response time |
| Shutdown Mode Current | 0.5 µA maximum - minimizes standby drain in disconnected or storage conditions |
| Overvoltage Threshold | 4250 mV ±10 mV - factory-programmed for precise cell balancing at 4.25 V with 200 mV hysteresis |
| OCD2 Threshold | 120 mV - sets secondary overcurrent detection level for sustained moderate overload conditions |
| SCD Threshold | 280 mV - triggers fast short-circuit response within 360 µs to prevent thermal runaway |
| Temperature Thresholds | OTD = 65°C, OTC = 45°C, UTD = –20°C, UTC = 0°C - dual-setpoint thermal protection for safe charge/discharge boundaries |
| Cell Count Support | 3–5 series - fixed configuration verified for 5-cell Li-ion packs; scalable beyond via stacking |
Pinout & Package
TSSOP-20 package (6.50 mm × 4.40 mm) with exposed thermal pad; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3–25 V main supply; powers analog/digital blocks and FET drivers |
| VC1–VC5 | Cell voltage sense inputs | Differential sensing of 5-series cell stack; VC5 connects to top cell positive |
| SRP / SRN | Current sense differential inputs | Measures voltage drop across sense resistor on PACK– side for discharge/charge current monitoring |
| CHG / DSG | Low-side FET gate drivers | Active-high outputs driving NMOS FETs; CHG controls charge path, DSG controls discharge path |
| CTRC / CTRD | Stack control inputs | Accept CHGU/DSG signals from upper device in cascade; enable hierarchical fault propagation |
| TS / VTB | Thermistor interface | TS accepts NTC voltage divider; VTB provides 3-V bias reference for temperature ratio-based thresholds |
| LD | Load removal detection | Monitors PACK– voltage drop to detect open-load condition and disable protections during disconnection |
Key Features
| Feature | Design Value |
|---|---|
| Stackable architecture | Enables seamless expansion from 3–5 cells per device to ≥20 cells using CHGU/CTRC cascading without external logic |
| Independent CHG/DSG drivers | Allows separate control of charge and discharge paths - critical for asymmetric protection in start-stop or regenerative systems |
| Factory-programmed thresholds | Eliminates external component tuning; BQ7790511PW configured for 4250-mV OV, 2700-mV UV, 120-mV OCD2, 280-mV SCD |
| Open-wire detection | Identifies broken interconnects between cells using 500-mV typical fault threshold and 100-mV hysteresis |
| Functional safety support | Includes built-in self-test modes and documentation aiding ISO 26262 ASIL-B or IEC 61508 SIL-2 system certification |
Applications
| Power Tools | Garden Tools |
|---|---|
Use Scenario: Cordless drill battery pack with 5-series 18650 Li-ion cells operating under high-pulse discharge loads. IC Role / Device Role / Timing Role: Primary protector executing real-time OV/UV/OC/OT/UT decisions and asserting CHG/DSG FETs within sub-millisecond latency. Use Value: Prevents cell damage during stall-current events using 280-mV SCD threshold and 360-µs detection, extending pack life in intermittent high-torque use. |
Use Scenario: 54-V string trimmer battery with integrated fuel gauge and thermal management. IC Role / Device Role / Timing Role: Standalone protector handling all safety-critical decisions without host MCU intervention during blade jam events. Use Value: Enables reliable 65°C OTD cutoff and automatic recovery at 55°C, preventing motor overheating-induced cell degradation. |
| Start-Stop Battery Packs | Light Electric Vehicles |
Use Scenario: 12-V replacement AGM battery using Li-ion chemistry with cold-cranking capability. IC Role / Device Role / Timing Role: Dual thermal threshold enforcement (UTC = 0°C, UTD = –20°C) ensures safe charging only above freezing and discharging down to –20°C. Use Value: Maintains vehicle restart reliability in sub-zero climates by permitting discharge at –20°C while blocking charge below 0°C. |
Use Scenario: 48-V e-scooter battery with 13-series configuration built from stacked BQ77905 devices. IC Role / Device Role / Timing Role: Bottom-device BQ7790511PW receives CHGU signal from upper device and asserts local DSG FET to isolate entire stack on fault. Use Value: Achieves full-stack protection coordination with <10 µs inter-device timing skew, eliminating single-point failure risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7790512PW | Higher OV threshold (4175 mV), longer OCD2 delay (350 ms vs. 90 ms), same 5-cell support | Better suited for chemistries requiring tighter upper voltage limits and slower overload response | Select BQ7790512PW when cell voltage tolerance is ≤4.175 V and moderate overcurrent events require extended hold time before shutdown |
| BQ7790509PW | Lower OCD2 threshold (100 mV), identical OV/UV settings, same thermal thresholds | More aggressive secondary overcurrent response for high-efficiency, low-resistance pack designs | Choose BQ7790509PW when sense resistor values are <5 mΩ and rapid reaction to 10-A+ transient overloads is required |
Compared with BQ7790511PW, BQ7790512PW trades faster short-circuit response for higher voltage margin, while BQ7790509PW prioritizes sensitivity to low-level overcurrents-both retain identical 5-cell topology, TSSOP-20 footprint, and cascading interface compatibility.
Availability
BQ7790511PW is available at Aetrix Electronics and suitable for power tools, garden tools, and start-stop battery packs requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for BQ7790511PW 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 over 50 years of innovation in battery management solutions.
The BQ77905 product line delivers scalable, ultra-low-power primary protection for lithium-based battery packs, designed specifically for cost-sensitive, high-volume portable and motive applications where MCU-less autonomy is essential.
FAQ
What is the factory-programmed overvoltage threshold for BQ7790511PW?
The BQ7790511PW has a factory-programmed overvoltage threshold of 4250 mV ±10 mV with 200 mV hysteresis. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The threshold applies to each individual cell sensed via VC1–VC5, and detection triggers after a 1-second delay as specified in the device comparison table.
Does BQ7790511PW support 6-series or higher battery configurations?
The BQ7790511PW itself supports up to 5-series cell configurations directly. However, it enables 6-series and higher stacks through cascaded operation: the CHGU output of an upper BQ77905 device connects to the CTRC input of the lower device (e.g., BQ7790511PW), allowing coordinated CHG/DSG control across the full stack without additional logic.
What is the short-circuit discharge (SCD) response time of BQ7790511PW?
The BQ7790511PW responds to short-circuit discharge events with a 360-µs detection delay, followed by immediate DSG FET turn-off. The SCD threshold is factory-set to 280 mV across SRP–SRN, and the fault recovery time is configurable as either 1 s or 9 s - both options apply to BQ7790511PW per its device configuration.
How does BQ7790511PW handle temperature protection without external ADCs?
The BQ7790511PW implements analog temperature protection using a ratio-metric method: the TS pin reads voltage from an NTC thermistor divider, while VTB supplies a stable bias. Thresholds like OTD = 65°C are encoded as 20.56% of VTB, eliminating need for digital conversion or calibration. This design ensures deterministic, low-latency thermal cutoffs independent of host processor.
Is BQ7790511PW pin-compatible with other BQ77905 variants?
Yes, all BQ77905 variants including BQ7790511PW share identical TSSOP-20 pinout, electrical characteristics, and functional interface. Differences are limited to factory-programmed protection thresholds and delays - no PCB layout changes are required when substituting within the BQ77905 family.
BQ7790511PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- 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:
- 20-TSSOP
BQ7790511PW FAQ
1.How can I place an order for BQ7790511PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7790511PW 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 BQ7790511PW reliable?
The price and inventory of BQ7790511PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7790511PW is usually 5 days.
3.What payment methods are accepted for BQ7790511PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7790511PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7790511PW?
BQ7790511PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7790511PW 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 BQ7790511PW?
For technical support, including BQ7790511PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7790511PW requirements.
6.How does Aetrix verify that BQ7790511PW is sourced from the original manufacturer or authorized distributors?
All BQ7790511PW 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 BQ7790511PW meets industry standards.
7.What is the process for return or replacement of BQ7790511PW?
All BQ7790511PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ7790511PW, 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 BQ7790511PW part is unused and in its original packaging.
Return procedure for BQ7790511PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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