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Texas Instruments BQ7790502PW
- Part No.:
- BQ7790502PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7790502PW.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,988
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Product details
Overview
BQ7790502PW 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, 6 µA normal-mode quiescent current, and independent CHG/DSG low-side NMOS FET drivers for 10.8-V to 72-V battery packs used in power tools and light electric vehicles.
For engineers reviewing the BQ7790502PW datasheet, BQ7790502PW pinout, BQ7790502PW application, or BQ7790502PW equivalent, key selection considerations include its 5-series cell support, 4250 mV overvoltage threshold with 1 s delay, 2700 mV undervoltage threshold with 1 s delay, and TSSOP-20 package compatibility with cascaded multi-device stacks.
Technical Context
The BQ7790502PW operates as a primary hardware-level protector in standalone or stacked configurations-up to four devices support ≥6-series cells. Its protection logic uses internal delay timers and factory-configured thresholds, eliminating external timing components.
It integrates dual independent low-side FET drivers (CHG and DSG), CTRC/CTRD cascade control inputs, and thermistor-based temperature sensing via TS/VTB pins. All protections-including OCD1 (85 mV), OCD2 (120 mV), SCD (240 mV), OTD/OTC (70°C/50°C), and UTD/UTC (–20°C/–5°C)-are implemented in analog/comparator circuitry with no firmware dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | Factory-configured for 3–5 series Li-ion cells; enables scalable stacks up to 20-series via cascading. |
| Overvoltage Threshold | 4250 mV ±10 mV at 25°C; triggers after 1 s delay-prevents cell degradation during charging. |
| Undervoltage Threshold | 2700 mV ±18 mV at 25°C; activates after 1 s delay-avoids deep discharge damage to cells. |
| OCD2 Detection | 120 mV (VSRP–VSRN) ±20% accuracy; 350 ms delay-supports high-current discharge monitoring. |
| Normal Mode Current | 6 µA typical at 25°C; enables ultra-low-power operation in always-on battery pack supervision. |
| Package | TSSOP-20 (6.50 mm × 4.40 mm); surface-mount compatible with automated PCB assembly. |
| Functional Safety | Documentation available to aid ISO 26262 or IEC 61508 system-level safety design. |
Pinout & Package
Package: 20-pin TSSOP (PW), body size 6.50 mm × 4.40 mm, JEDEC MO-153 compliant, thermal resistance RθJA = 98.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3–25 V main supply; powers internal regulators and logic; POR threshold at 4 V. |
| VC1–VC5 | Cell voltage sense inputs | Differential inputs for 5-series cell monitoring; VC5 must connect to VC4 on BQ77904 but not required on BQ77905. |
| SRP / SRN | Current sense differential inputs | Measures (VSRP – VSRN) for OCD1/OCD2/SCD detection; supports bidirectional current sensing. |
| CHG / DSG | Low-side FET gate drivers | Active-high outputs driving NMOS CHG/DSG FETs; 12 V typical on-state drive at VDD ≥12 V. |
| CTRC / CTRD | Cascade control inputs | Accept CHGU/DSG signals from upper device in stack; enable inter-device coordination without MCU. |
| TS / VTB | Thermistor interface | TS accepts NTC thermistor; VTB provides 3.0 V bias reference for temperature threshold calculation. |
| LD | Load removal detection input | Detects PACK– disconnection via 1.3 V threshold; enables fast fault isolation in field-replaceable modules. |
Key Features
| Feature | Design Value |
|---|---|
| Stackable architecture | Enables 3–20 series cell protection using up to four BQ7790502PW devices in cascade-no additional communication bus required. |
| Independent CHG/DSG control | Separate gate drivers allow asymmetric charge/discharge cutoff-critical for chemistries requiring strict charge-only termination. |
| Open-wire detection | Identifies broken cell interconnects via 500 mV ±50 mV threshold per VCx pin-prevents false undervoltage alarms in multi-cell strings. |
| Factory-programmed thresholds | Eliminates external resistor networks; BQ7790502PW fixed configuration includes 4250 mV OV, 2700 mV UV, 120 mV OCD2, and 70°C/50°C OTD/OTC. |
| Ultra-low shutdown current | 0.5 µA maximum in SHUTDOWN mode-preserves backup battery life during long-term storage or transport. |
Applications
| Power Tools | Light Electric Vehicles (LEVs) |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs operating at 36 V (10S) with dynamic load spikes exceeding 30 A. IC Role / Device Role / Timing Role: Primary hardware protector executing real-time overcurrent (OCD2 = 120 mV) and short-circuit (SCD = 240 mV) cutoff within 350 ms and 400 µs respectively. Use Value: Prevents MOSFET thermal runaway during stall events while maintaining <6 µA background consumption between operations. |
Use Scenario: 48 V e-bike battery with integrated cell balancing and thermal management across 13–14 series Li-ion cells. IC Role / Device Role / Timing Role: Stackable protector node managing 5-cell segment; interfaces with host MCU via LD signal and thermistor network for coordinated thermal derating. Use Value: Enables modular pack design-replacing one 5-cell module does not require reprogramming or recalibration of adjacent segments. |
| Start-Stop Automotive Batteries | Energy Storage Systems (ESS) |
|
Use Scenario: 12 V Li-ion replacement for lead-acid start-stop batteries subjected to frequent micro-cycling and cold cranking. IC Role / Device Role / Timing Role: Voltage supervisor enforcing 2700 mV undervoltage lockout and –20°C undertemperature discharge cutoff to prevent lithium plating. Use Value: Extends cycle life by avoiding deep discharge below 2.7 V/cell and disabling discharge below –20°C without software intervention. |
Use Scenario: Residential 48 V DC-coupled ESS using 16S LiFePO₄ with requirement for UL 1973 compliance and fault logging. IC Role / Device Role / Timing Role: Hardware-enforced safety layer providing independent overvoltage (4250 mV) and open-wire detection-complements BMS MCU for redundancy. Use Value: Meets functional safety requirements via documented failure modes; eliminates single-point MCU failure risk for critical protection functions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7790503PW | Same 5-cell support; OV = 4200 mV, UV = 2700 mV, OCD2 = 160 mV, 2 s UV delay, load-removal + delay recovery. | Better suited for chemistries requiring tighter overvoltage margin (e.g., NMC at 4.2 V max) and slower UV response to avoid nuisance trips. | Select BQ7790503PW when lower OV threshold and longer UV delay improve robustness against transient voltage spikes. |
| BQ7790508PW | OV = 3900 mV, UV = 2000 mV, OCD2 = 100 mV, 90 ms OCD2 delay, 700 ms SCD delay-optimized for LFP cells. | Targets LiFePO₄ with flatter voltage curve; lower thresholds align with 3.65 V max and 2.5 V min cell limits. | Choose BQ7790508PW for LFP-based packs where 3900 mV OV and 2000 mV UV match nominal chemistry voltage windows. |
Compared with BQ7790502PW, BQ7790503PW offers tighter overvoltage control and longer UV delay for NMC stability, while BQ7790508PW provides LFP-optimized thresholds and faster OCD2 response-neither is pin-compatible but all share identical TSSOP-20 footprint and cascade interface.
Availability
BQ7790502PW is available at Aetrix Electronics and suitable for power tools, light electric vehicles, and start-stop battery packs requiring stable component supply, long-lifecycle assurance, and consistent factory-programmed protection behavior across production batches.
Supply support for BQ7790502PW 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 BQ7790502PW belongs to TI's BQ77905 family of stackable lithium-ion protectors-designed specifically for cost-sensitive, high-reliability battery packs needing autonomous hardware-level safety without microcontroller dependency.
FAQ
What is the overvoltage protection threshold and delay setting for BQ7790502PW?
The BQ7790502PW has a fixed overvoltage threshold of 4250 mV ±10 mV at 25°C with a 1-second detection delay. This setting prevents cell overcharge in 5-cell Li-ion packs while allowing brief voltage transients during charger regulation. The delay is factory-programmed and non-adjustable, ensuring consistent behavior across units without external components.
Does BQ7790502PW support stacking with other BQ77905 variants?
Yes, BQ7790502PW supports hardware stacking with any BQ77905 variant (e.g., BQ7790503PW or BQ7790508PW) using the CTRC and CTRD pins. The cascade interface is electrically compatible across the family-upper-device CHGU/DSG outputs directly drive lower-device CTRC/CTRD inputs, enabling mixed-configuration stacks for heterogeneous cell groupings.
What is the purpose of the LD pin on BQ7790502PW?
The LD (Load Detection) pin on BQ7790502PW detects disconnection of the PACK– terminal via a 1.3 V threshold. When triggered, it signals an open-load condition-used to isolate faulty modules in serviceable battery packs or initiate safe shutdown sequences. Its 160–375 kΩ input resistance allows direct connection to PACK– without external biasing.
How does BQ7790502PW implement temperature protection without a dedicated ADC?
BQ7790502PW uses a ratiometric thermistor interface: the TS pin reads voltage across an external NTC thermistor tied between VTB (3.0 V bias) and AVSS, converting temperature to a %VTB ratio. Thresholds like 70°C (OTD) correspond to 20.56% VTB-measured directly by internal comparators, eliminating need for digital conversion or calibration.
Is BQ7790502PW pin-compatible with BQ77904 series devices?
No, BQ7790502PW is not pin-compatible with BQ77904 devices. While both use 20-pin TSSOP packages, BQ77905 includes VC5 as a functional cell-sense input, whereas BQ77904 requires VC5 to be externally tied to VC4. This difference affects PCB layout and routing-BQ7790502PW designs cannot reuse BQ77904 footprints without modification.
BQ7790502PW 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
BQ7790502PW FAQ
1.How can I place an order for BQ7790502PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7790502PW 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 BQ7790502PW reliable?
The price and inventory of BQ7790502PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7790502PW is usually 5 days.
3.What payment methods are accepted for BQ7790502PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7790502PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7790502PW?
BQ7790502PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7790502PW 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 BQ7790502PW?
For technical support, including BQ7790502PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7790502PW requirements.
6.How does Aetrix verify that BQ7790502PW is sourced from the original manufacturer or authorized distributors?
All BQ7790502PW 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 BQ7790502PW meets industry standards.
7.What is the process for return or replacement of BQ7790502PW?
All BQ7790502PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ7790502PW, 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 BQ7790502PW part is unused and in its original packaging.
Return procedure for BQ7790502PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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