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Texas Instruments BQ7790508PWR
- Part No.:
- BQ7790508PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7790508PWR.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,925
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Product details
Overview
BQ7790508PWR 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, 100-mV overcurrent discharge 2 threshold, and 700-ms delay for OCD2 detection - enabling robust protection in 18.5-V to 22.5-V battery packs for power tools and light EVs.
For engineers reviewing the BQ7790508PWR datasheet, BQ7790508PWR pinout, BQ7790508PWR application, or BQ7790508PWR equivalent, key selection considerations include its 20-pin TSSOP package, independent CHG/DSG low-side NMOS drivers, 6-µA normal-mode current, and support for cascaded stacks up to 20-series cells.
Technical Context
The BQ7790508PWR integrates analog comparators with internal delay timers for autonomous fault response, eliminating need for external microcontroller supervision. Its CCFG pin configures cell count (3–5 series), while CTRC/CTRD pins enable inter-device FET signal cascading in stacked topologies.
Protection logic uses dual-stage overcurrent detection: OCD1 triggers at –50 mV with 1420-ms delay for sustained overload, while OCD2 activates at –100 mV with 700-ms delay for moderate overloads - both with ±20% accuracy below 20 mV and ±30% above. Temperature thresholds are defined as ratios of VTB voltage, requiring external 10-kΩ resistor and 103AT NTC thermistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | Factory-configured for 3–5 series Li-ion cells; scalable to ≥20 series via stacking |
| Overvoltage Threshold | 3900 mV ±10 mV - enables precise high-voltage cutoff for 4.2-V/cell chemistries |
| Undervoltage Threshold | 2000 mV ±18 mV - prevents deep discharge in 3.7-V nominal 5S packs |
| OCD2 Detection | –100 mV threshold with 700-ms delay - balances fast response and noise immunity for motor startup surges |
| Normal Mode Current | 6 µA typical - minimizes quiescent drain in always-on battery protection systems |
| Shutdown Current | 0.5 µA maximum - extends shelf life during storage or transport |
| Package | 20-pin TSSOP (6.50 mm × 4.40 mm) - compatible with standard SMT assembly and thermal relief pads |
Pinout & Package
Package: 20-pin TSSOP (PW), body size 6.50 mm × 4.40 mm, JEDEC MO-153 compliant, exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Accepts 3–25 V; powers internal regulators and logic; POR threshold at 4 V |
| VC1–VC5 (Pins 7,6,5,4,3) | Cell voltage sense inputs | Monitor individual cell voltages; VC5 must connect to VC4 on BQ77904 but not required on BQ7790508PWR |
| SRP/SRN (Pins 9,10) | Current sense differential inputs | Measure pack current via sense resistor; support bidirectional sensing for charge/discharge monitoring |
| CHG/DSG (Pins 13,11) | Low-side NMOS FET drivers | Drive external CHG/DSG FET gates; output 12 V typical when enabled; clamp voltage 18 V max |
| CTRC/CTRD (Pins 18,19) | Stack control inputs | Accept CHGU/DSGU signals from upper device in cascade; deglitched with 7-ms filter |
| TS/VTB (Pins 15,16) | Thermistor interface | TS reads NTC voltage; VTB provides 2.5-V bias reference; thresholds expressed as %VTB |
| LD (Pin 14) | Load removal detection | Detects open PACK– connection; 1.3-V threshold with 1.5-ms deglitch; supports load recovery |
Key Features
| Feature | Design Value |
|---|---|
| Stackable architecture | Enables modular scaling from 5S to 20S using identical BQ7790508PWR devices without firmware changes |
| Independent CHG/DSG control | Allows separate disable of charge and discharge paths - critical for safe charging in multi-bank systems |
| Open-wire detection | Identifies broken cell interconnects with 500-mV fault threshold and 4.5-s delay - prevents false trips during transients |
| Functional safety documentation | Includes FIT rate data, failure mode analysis, and diagnostic coverage reports per ISO 26262 requirements |
| Built-in self-test (BIST) | Verifies comparator functionality and timing blocks at power-up - reduces need for external test fixtures |
Applications
| Power Tools | Garden Tools |
|---|---|
|
Use Scenario: Cordless drill/driver operating at 18–20 V with peak currents >30 A during stall conditions. IC Role / Device Role / Timing Role: Primary protector executing autonomous OV/UV/OCD2/OTD/UTD decisions within fixed delays; CHG/DSG drivers directly control external MOSFETs. Use Value: Prevents cell damage from motor lockup surges using –100 mV OCD2 threshold and 700-ms delay - faster than full shutdown but immune to brief commutation spikes. |
Use Scenario: Battery-powered hedge trimmer with intermittent high-current bursts and ambient temperatures up to 60°C. IC Role / Device Role / Timing Role: Standalone protector managing thermal limits (OTD = 70°C, UTD = –20°C) and voltage windows (OV = 3900 mV, UV = 2000 mV) without host intervention. Use Value: Enables operation across wide temperature range while maintaining ±10 mV voltage accuracy - ensures consistent cut-off points despite thermistor drift. |
| Light Electric Vehicles | Energy Storage Systems |
|
Use Scenario: 20-V e-bike battery pack subject to regenerative braking currents and vibration-induced connector fatigue. IC Role / Device Role / Timing Role: Stackable protector detecting open-wire faults (OW delay = 4.5 s) and short-circuit events (SCD delay = 360 µs) across 5S configuration. Use Value: Identifies intermittent cell disconnection before catastrophic failure - 500-mV OW threshold avoids nuisance trips from EMI on long harnesses. |
Use Scenario: Residential 48-V Li-ion backup system requiring UL 1973 compliance and 15-year service life. IC Role / Device Role / Timing Role: Primary safety layer enforcing overtemperature charge (OTC = 50°C) and undervoltage (UV = 2000 mV) limits with 2-s delay to tolerate grid transient dips. Use Value: Meets IEC 62133 thermal runaway prevention requirements using ratio-based VTB-referenced thresholds - eliminates calibration dependency on thermistor batch variance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7790509PWR | Higher OV threshold (4250 mV vs. 3900 mV); same UV (2500 mV), OCD2 (–100 mV), and delays | Better suited for 4.3-V/cell chemistries; less margin for 4.2-V cells under temperature drift | Select BQ7790509PWR only if cell OCV exceeds 4.25 V at full charge and thermal compensation is implemented |
| BQ7790505PWR | Lower OCD2 threshold (–80 mV); UV = 2700 mV; no load-removal recovery (N vs. Y) | Optimized for lower-voltage 3.6-V/cell LFP; lacks automatic recovery after UV fault clearance | Choose BQ7790505PWR for LFP-based UPS where UV recovery must be host-controlled rather than autonomous |
Compared with BQ7790509PWR and BQ7790505PWR, the BQ7790508PWR offers balanced overvoltage margin for standard NMC cells, guaranteed load-removal recovery, and optimal OCD2 sensitivity for brushed DC motor loads - making it the default choice for 18–22-V power tool platforms.
Availability
BQ7790508PWR is available at Aetrix Electronics and suitable for power tools, light electric vehicles, and energy storage systems requiring stable component supply, long-lifecycle support, and automotive-grade reliability validation.
Supply support for BQ7790508PWR 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 BQ7790508PWR belongs to TI's BQ77905 family of ultra-low-power stackable battery protectors, designed specifically for cost-sensitive, high-volume portable equipment requiring autonomous, MCU-free cell-level safety enforcement.
FAQ
What is the overvoltage protection threshold programmed in the BQ7790508PWR?
The BQ7790508PWR has a factory-programmed overvoltage threshold of 3900 mV ±10 mV at 25°C, with hysteresis set to 200 mV. This value is optimized for 4.2-V nominal Li-ion cells and remains stable across –40°C to +85°C with ±40 mV total error. The threshold is implemented using precision internal references and does not require external resistor programming.
Does the BQ7790508PWR support stacking beyond 5-series configurations?
Yes, the BQ7790508PWR supports cascaded stacking up to 20-series cells using its CTRC and CTRD pins. In a stack, the CHGU and DSGU outputs of an upper device drive the CTRC and CTRD inputs of the device below, enabling synchronized FET control. Each BQ7790508PWR handles up to 5 cells, so four devices configure a 20S pack - all sharing identical part numbers and programming.
What is the purpose of the LD pin on the BQ7790508PWR?
The LD (Load Detection) pin on the BQ7790508PWR detects open-circuit conditions on the PACK– line by monitoring voltage drop across an internal resistor. It triggers at 1.3 V with 1.5-ms deglitching and supports automatic recovery when the load is reconnected - a feature enabled in the BQ7790508PWR configuration (Y) unlike some variants such as BQ7790505PWR (N).
How does the BQ7790508PWR achieve temperature protection without a dedicated ADC?
The BQ7790508PWR implements temperature protection using a ratiometric method: the TS pin measures voltage across an external 10-kΩ resistor and 103AT NTC thermistor, while VTB provides a stable 2.5-V bias. Protection thresholds (e.g., OTD = 70°C) are defined as percentages of VTB (e.g., 20.56% VTB), allowing accurate trip points without calibration - all comparisons occur internally using analog comparators.
Can the BQ7790508PWR be used in lead-acid replacement battery packs?
Yes, the BQ7790508PWR is explicitly qualified for lead-acid (PbA) replacement applications per TI's official documentation. Its wide input range (3–25 V), programmable UV threshold (2000 mV), and robust open-wire detection make it suitable for 12-V to 24-V PbA replacements. However, users must adapt the thermistor network and voltage thresholds to match PbA voltage profiles and temperature behavior.
BQ7790508PWR 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
BQ7790508PWR FAQ
1.How can I place an order for BQ7790508PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7790508PWR 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 BQ7790508PWR reliable?
The price and inventory of BQ7790508PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7790508PWR is usually 5 days.
3.What payment methods are accepted for BQ7790508PWR?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7790508PWR?
BQ7790508PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7790508PWR 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 BQ7790508PWR?
For technical support, including BQ7790508PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7790508PWR requirements.
6.How does Aetrix verify that BQ7790508PWR is sourced from the original manufacturer or authorized distributors?
All BQ7790508PWR 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 BQ7790508PWR meets industry standards.
7.What is the process for return or replacement of BQ7790508PWR?
All BQ7790508PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7790508PWR, 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 BQ7790508PWR part is unused and in its original packaging.
Return procedure for BQ7790508PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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