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Texas Instruments BQ7790502PWR
- Part No.:
- BQ7790502PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7790502PWR.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,052
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Product details
Overview
BQ7790502PWR from Texas Instruments is a 3- to 5-series ultra-low-power lithium-ion battery protector IC implementing voltage, current, temperature, and open-wire protection without MCU control. It features ±10 mV overvoltage/undervoltage accuracy, 6 µA normal-mode quiescent current, and factory-programmed 4.25 V overvoltage / 2.7 V undervoltage thresholds with 1 s delay - deployed in power tools and light electric vehicle battery packs.
For engineers reviewing the BQ7790502PWR datasheet, BQ7790502PWR pinout, BQ7790502PWR application, or BQ7790502PWR equivalent, key selection criteria include its stackable TSSOP-20 interface for ≥6-series scaling, independent CHG/DSG low-side NMOS drivers, and integrated thermistor-based temperature monitoring with configurable OTC/OTD/UTC/UTD thresholds.
Technical Context
The BQ7790502PWR implements autonomous analog protection logic with no firmware dependency, using dedicated comparators and internal delay timers for all fault responses. Its CCFG pin configures 3-/4-/5-cell operation via AVDD-ratio thresholds (10%, 65–100%, or 25–45%), while cascading is enabled through CTRC/CTRD control pins that accept stacked-device CHGU signals.
Protection execution relies on direct sensing: VC1–VC5 inputs monitor individual cell voltages; SRP/SRN measure pack current via external sense resistor; TS/VTB interface a 10-kΩ NTC thermistor for temperature-derived mV thresholds; and LD detects load removal by sensing PACK– voltage drop. All fault outputs drive CHG/DSG FETs with 12 V typical on-voltage and sub-15 µs fall times.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Normal Mode Current | 6 µA - enables multi-year runtime in always-on battery packs without compromising protection responsiveness. |
| Overvoltage Threshold | 4.25 V ±10 mV - factory-programmed for precise Li-ion cell safety at full charge, with 1 s detection delay. |
| Undervoltage Threshold | 2.7 V ±18 mV - prevents deep discharge damage to 3–5 series Li-ion cells, with 1 s delay and 200 mV hysteresis. |
| OCD2 Detection Range | –85 mV to +170 mV - supports dual-level discharge current limiting, with ±30% accuracy above 20 mV for robust fault discrimination. |
| Temperature Sensing | Uses TS/VTB with 10-kΩ NTC - delivers programmable OTD/OTC/UTD/UTC thresholds (e.g., 70°C/50°C/–20°C/–5°C) referenced to VTB ratio. |
| Open-Wire Detection | 450–550 mV per-cell threshold with 100 mV hysteresis - identifies broken interconnects between adjacent cells before pack failure. |
| Shutdown Current | ≤0.5 µA - ensures minimal self-discharge during storage or maintenance mode, preserving state-of-charge. |
Pinout & Package
TSSOP-20 package (6.50 mm × 4.40 mm), 0.65 mm pitch, exposed thermal pad - optimized for compact, high-density battery management PCB layouts with thermal relief capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Supply input | 3–25 V main power rail; powers analog/digital blocks and enables POR at 4 V rising threshold. |
| VC1–VC5 | Cell voltage sense inputs | Differential inputs for 3–5 series Li-ion cells; VC5 must be tied to VC4 on BQ77904 but remains active on BQ7790502PWR. |
| SRP / SRN | Current sense differential inputs | Monitor voltage drop across external sense resistor to detect OCD1/OCD2/SCD faults with ±20% accuracy. |
| CHG / DSG | Low-side NMOS FET drivers | Drive external CHG/DSG FET gates directly; 12 V typical on-voltage, 15 µs max fall time, 0.5 kΩ off-resistance. |
| CTRC / CTRD | Stack control inputs | Accept CHGU signal from upper device in cascade; enable/disable CHG/DSG drivers externally or via stacked configuration. |
| TS / VTB | Thermistor interface | TS connects to NTC thermistor; VTB provides 3 V bias - together they generate mV-ratio thresholds for temperature protection. |
| LD | Load removal detection | Senses PACK– voltage drop to disable protections during disconnection; 1.3 V threshold with 1.5 ms deglitch. |
Key Features
| Feature | Design Value |
|---|---|
| Stackable architecture | Supports up to 20-series configurations via daisy-chained CTRC/CTRD and CHGU signals - eliminates need for master MCU in scalable battery packs. |
| Independent CHG/DSG control | Separate drivers allow asymmetric protection - e.g., disable charging while permitting discharge during UTC fault, critical for safe Li-ion operation. |
| Factory-programmed protection set | BQ7790502PWR variant fixed at 4.25 V OV / 2.7 V UV / 70°C OTD / 50°C OTC / –20°C UTD / –5°C UTC - reduces BOM count and qualification effort. |
| Built-in self-test (BIST) | Verifies comparator functionality and timing paths during power-up - enhances reliability in safety-critical applications like power tools and LEVs. |
| Functional safety documentation | TI provides FIT rate data, failure mode analysis, and diagnostic coverage reports - accelerates ISO 26262 ASIL-B or IEC 61508 SIL-2 system certification. |
Applications
| Power Tools | Garden Tools |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs subject to high pulse currents (>30 A), mechanical shock, and ambient temperature swings from –10°C to 60°C. IC Role / Device Role / Timing Role: Primary protector executing autonomous OV/UV/OCD2/OTD/UTD decisions within 1 s, disabling DSG FET on fault without host intervention. Use Value: Prevents cell venting or thermal runaway during stall events by detecting 120 mV OCD2 (≈24 A @ 5 mΩ sense) with 350 ms delay - faster than MCU-based solutions. |
Use Scenario: Robotic lawnmower battery modules requiring long shelf life, vibration resilience, and reliable cold-weather startup down to –10°C. IC Role / Device Role / Timing Role: Standalone protector managing charge/discharge enable states via CHG/DSG drivers, using TS/VTB to enforce –5°C UTC and –10°C UTD limits. Use Value: Enables safe charging below freezing by blocking CHG FET until thermistor confirms >–5°C - avoids lithium plating and capacity loss. |
| Light Electric Vehicles | Energy Storage Systems |
|
Use Scenario: E-bike 48 V (13S) battery packs with cascaded BQ77905 devices, needing fail-safe open-wire detection after connector mating cycles. IC Role / Device Role / Timing Role: Bottom-device BQ7790502PWR monitors VC1–VC5 and feeds CHGU to upper device's CTRC; detects open-wire faults in 4.5 s with 500 mV threshold. Use Value: Identifies broken cell interconnects before ride initiation - prevents unbalanced charging and single-cell overvoltage in series strings. |
Use Scenario: Residential 48 V/51.2 V LiFePO₄ backup systems requiring UL 1973 compliance, 10+ year field life, and zero firmware updates. IC Role / Device Role / Timing Role: Hardware-only protector enforcing 2.5 V UV (scaled) and 3.65 V OV with 2 s delays, using LD pin to confirm load disconnect before fault clearing. Use Value: Eliminates software attack surface and MCU aging risks - meets functional safety requirements for stationary storage without runtime diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7790503PWR | Same 5-cell support, but 4.2 V OV / 2.7 V UV / 1420 ms OCD2 delay vs. BQ7790502PWR's 4.25 V OV / 2.7 V UV / 350 ms OCD2 delay. | Preferred for slower-fault applications like energy storage where extended overcurrent tolerance is acceptable. | Select BQ7790503PWR when longer OCD2 response time improves system robustness against transient surges. |
| BQ7790508PWR | Lower 3.9 V OV threshold and 2.0 V UV threshold - optimized for LTO or high-cycle-life Li-ion chemistries. | Used in lead-acid replacement packs where lower voltage windows prevent premature cutoff. | Choose BQ7790508PWR only when cell chemistry requires sub-4.0 V overvoltage clamping and 2.0 V undervoltage release. |
Compared with BQ7790503PWR and BQ7790508PWR, the BQ7790502PWR offers the fastest OCD2 response (350 ms) at highest OV threshold (4.25 V), making it optimal for high-performance power tools demanding rapid fault shutdown without false triggers.
Availability
BQ7790502PWR is available at Aetrix Electronics and suitable for power tools, light electric vehicles, and energy storage systems requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for BQ7790502PWR 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 and embedded processing technologies, with decades of expertise in battery management ICs and functional safety design.
The BQ77905 family targets cost-sensitive, high-reliability lithium battery packs - delivering stackable, MCU-free protection for 3–5 series cells in portable and motive applications.
FAQ
What is the overvoltage protection threshold programmed in the BQ7790502PWR?
The BQ7790502PWR has a factory-programmed overvoltage threshold of 4.25 V ±10 mV with a 1 s detection delay. This value is fixed and cannot be adjusted externally - it is optimized for standard NMC/NCA lithium-ion cells at full charge, ensuring cell longevity and safety without requiring calibration or configuration.
Does the BQ7790502PWR support 5-series battery configurations?
Yes, the BQ7790502PWR explicitly supports 3-, 4-, and 5-series lithium-ion configurations via its CCFG pin, which reads AVDD-ratio thresholds (10%, 65–100%, or 25–45%) to auto-detect cell count. Unlike the BQ77904, the BQ7790502PWR activates VC5 as a valid sense input for five-cell stacks.
How does the BQ7790502PWR handle temperature protection without a microcontroller?
The BQ7790502PWR uses analog circuitry to monitor temperature via the TS pin and VTB bias output, converting NTC thermistor resistance into mV-ratio thresholds. It implements four independent temperature protections - OTD, OTC, UTD, UTC - each with fixed thresholds (e.g., 70°C OTD, –5°C UTC) and 4.5 s delays, all executed autonomously without firmware.
Can the BQ7790502PWR be used in stacked configurations for more than 5 series cells?
Yes, the BQ7790502PWR supports stacking up to 20-series cells using its CTRC and CTRD pins. In a cascade, the upper device's CHGU output drives the lower device's CTRC pin to synchronize CHG/DSG control - enabling scalable, MCU-free protection for high-voltage battery packs like e-bikes and energy storage systems.
What is the purpose of the LD pin on the BQ7790502PWR?
The LD (Load Detection) pin on the BQ7790502PWR senses voltage at PACK– to detect load disconnection. When LD falls below 1.3 V, the device interprets this as load removal and inhibits automatic fault recovery - preventing unsafe re-engagement of CHG/DSG FETs until the load is reconnected and protections are manually reset or re-validated.
BQ7790502PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
BQ7790502PWR FAQ
1.How can I place an order for BQ7790502PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7790502PWR 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 BQ7790502PWR reliable?
The price and inventory of BQ7790502PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7790502PWR is usually 5 days.
3.What payment methods are accepted for BQ7790502PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7790502PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7790502PWR?
BQ7790502PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7790502PWR 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 BQ7790502PWR?
For technical support, including BQ7790502PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7790502PWR requirements.
6.How does Aetrix verify that BQ7790502PWR is sourced from the original manufacturer or authorized distributors?
All BQ7790502PWR 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 BQ7790502PWR meets industry standards.
7.What is the process for return or replacement of BQ7790502PWR?
All BQ7790502PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7790502PWR, 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 BQ7790502PWR part is unused and in its original packaging.
Return procedure for BQ7790502PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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