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Texas Instruments BQ7790505PWR
- Part No.:
- BQ7790505PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7790505PWR.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,005
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Product details
Overview
BQ7790505PWR from Texas Instruments is a 3- to 5-series ultra-low-power lithium-ion battery protector IC implementing integrated voltage, current, temperature, and open-wire protection without MCU control. It delivers ±10 mV overvoltage/undervoltage accuracy, 6 µA normal-mode quiescent current, and factory-programmed thresholds for overtemperature discharge (65°C), undertemperature charge (0°C), and overcurrent discharge 2 (60 mV). It is used in 10.8-V to 36-V power tool and light EV battery packs.
For engineers reviewing the BQ7790505PWR datasheet, BQ7790505PWR pinout, BQ7790505PWR application, or BQ7790505PWR equivalent, key selection criteria include its 20-pin TSSOP package, stackable architecture for ≥6-series scaling, independent CHG/DSG low-side NMOS drivers, and load-removal detection via LD pin - all critical for robust, maintenance-free pack-level safety in industrial portable systems.
Technical Context
The BQ7790505PWR implements autonomous analog protection logic with no firmware dependency, using dedicated comparators and internal delay timers for all fault responses. Its CCFG pin configures cell count (3–5 series), while CTRC/CTRD pins enable cascaded control across stacked devices for higher-series applications.
Protection thresholds are fixed at factory: OV = 4250 mV (1 s delay, 200 mV hysteresis), UV = 2700 mV (1 s delay, 200 mV hysteresis), OCD2 = 60 mV (5 ms delay), OTD = 65°C, UTC = 0°C, and open-wire detection enabled with 200-nA sink current per VCx pin. Load removal recovery is disabled (N) per device configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | Factory-configured for 3-, 4-, or 5-series Li-ion stacks; scalable to ≥20-series via daisy-chained stacking |
| Normal Mode Current | 6 µA typical - enables multi-year runtime on backup cells or low-leakage battery monitoring circuits |
| Overvoltage Threshold | 4250 mV ±10 mV - precise cell balancing guardrail preventing electrolyte decomposition in high-voltage Li-ion cells |
| OCD2 Threshold & Delay | 60 mV with 5 ms delay - fast response to moderate overloads while avoiding false trips during motor startup surges |
| OTD / UTC Thresholds | 65°C discharge cutoff and 0°C charge enable - prevents lithium plating and thermal runaway in power tools and e-bikes |
| Open-Wire Detection | 200-nA sink per VCx pin - reliably identifies broken interconnects in multi-cell modules without external biasing |
| Shutdown Current | ≤0.5 µA - ensures minimal self-discharge during long-term storage of sealed battery packs |
Pinout & Package
Package: 20-pin TSSOP (PW), 6.50 mm × 4.40 mm body size, exposed pad not specified for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Accepts 3 V to 25 V; powers internal regulators and logic; POR threshold at 4 V ensures reliable startup |
| VC1–VC5 (Pins 3–7) | Cell voltage sense inputs | Directly monitor individual cell voltages up to 5-series; VC5 must be tied to VC4 on BQ77904 but is active on BQ7790505PWR |
| SRP / SRN (Pins 9–10) | Current sense differential inputs | Measure (VSRP – VSRN) for OCD1/OCD2/SCD; supports bidirectional sensing with ±340 mV full-scale range |
| CHG / DSG (Pins 13, 11) | Low-side NMOS FET drivers | Drive external N-channel FET gates; CHG clamps at 18 V, DSG sinks 1 mA - compatible with common logic-level FETs |
| CTRC / CTRD (Pins 18–19) | Stack control inputs | Accept high-impedance signals from upper-device CHGU/DSG outputs to enable cascaded protection in ≥6-series configurations |
| LD (Pin 14) | Load removal detection input | Detects open-circuit PACK– condition; 1.3 V threshold with 1.5 ms deglitch - prevents false shutdown during transient disconnection |
| TS / VTB (Pins 15, 16) | Thermistor interface | TS accepts NTC thermistor; VTB supplies 3.0 V bias - enables accurate temperature measurement using standard 10-kΩ/103AT sensors |
Key Features
| Feature | Design Value |
|---|---|
| Stackable architecture | Enables modular design from 3- to 20-series battery packs using identical BQ7790505PWR devices - eliminates custom firmware per cell count |
| Independent CHG/DSG drivers | Allows separate control of charge and discharge paths - essential for asymmetric protection in start-stop and regenerative braking systems |
| Factory-programmed protection set | Eliminates external resistor networks or configuration EEPROM; BQ7790505PWR is shipped with OV=4250 mV, UV=2700 mV, OCD2=60 mV, OTD=65°C, UTC=0°C |
| Load removal detection (LD) | Prevents false fault latching when PACK– is disconnected - maintains system readiness during hot-swap or service operations |
| Built-in self-test functions | Verifies comparator integrity and timing paths during power-up - meets functional safety requirements for ASIL-B automotive subsystems |
Applications
| Power Tools | Garden Tools |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs operating at 18–36 V with high pulse discharge currents up to 30 A. IC Role / Device Role: Primary hardware-level protector enforcing cell voltage limits, temperature cutoffs, and short-circuit response without software intervention. Use Value: Prevents thermal runaway during stall conditions and extends cycle life by blocking charge below 0°C and discharge above 65°C. |
Use Scenario: Robotic lawnmower and hedge trimmer batteries subjected to outdoor ambient extremes (–20°C to +60°C). IC Role / Device Role: Autonomous safety supervisor detecting open-wire faults in multi-cell modules and disabling FETs within 5 ms of overcurrent. Use Value: Ensures field-replaceable battery modules remain safe after mechanical vibration-induced connector failure or PCB trace cracking. |
| Light Electric Vehicles | Energy Storage Systems |
|
Use Scenario: 36-V e-bike battery packs with integrated BMS requiring fail-safe discharge cutoff during brake regeneration surges. IC Role / Device Role: Stackable protector providing OCD2 (60 mV) response to 15–20 A continuous loads and SCD (100 mV) trip within 360 µs. Use Value: Eliminates need for external current-sense amplifiers and microcontroller-based fault arbitration - reduces BOM cost and latency. |
Use Scenario: Residential 48-V LiFePO₄ backup systems where long shelf life and zero-maintenance operation are mandatory. IC Role / Device Role: Ultra-low-power (6 µA) protector enabling >10-year calendar life on primary cell backup; supports 20-series scaling via daisy chain. Use Value: Maintains protection integrity during 5+ year deployments without firmware updates or battery cycling - critical for off-grid reliability. |
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-series support, but UV = 2700 mV with 2 s delay and load removal recovery enabled (Y); OCD2 = 80 mV, 350 ms delay | Better suited for applications requiring graceful recovery after temporary undervoltage events (e.g., cold cranking) | Select BQ7790503PWR if UV fault recovery without manual reset is required; BQ7790505PWR is preferred for hard-lock safety-critical cutoffs. |
| BQ7790502PWR | OV = 4250 mV (1 s), UV = 2700 mV (1 s), OCD2 = 85 mV (350 ms), OTD = 70°C, UTC = –5°C; load removal recovery enabled | Higher OTD and lower UTC thresholds allow wider operational temperature envelope in industrial UPS systems | Choose BQ7790502PWR for environments demanding discharge above 65°C or charge below 0°C; BQ7790505PWR prioritizes stricter thermal safety margins. |
Compared with BQ7790503PWR and BQ7790502PWR, the BQ7790505PWR provides the fastest OCD2 response (5 ms vs. 350 ms), disables automatic load-removal recovery for deterministic fault lockout, and sets UTC at 0°C - making it optimal for consumer-grade power tools where immediate, non-recoverable shutdown under unsafe thermal conditions is mandated.
Availability
BQ7790505PWR 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 guaranteed traceability for ISO 9001-compliant production.
Supply support for BQ7790505PWR 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 BQ7790505PWR belongs to TI's BQ77905 family of stackable, ultra-low-power battery protectors designed specifically for cost-sensitive, high-reliability 3–5-series lithium-ion packs in portable industrial equipment.
FAQ
What is the factory-programmed overvoltage threshold for BQ7790505PWR?
The BQ7790505PWR is factory-programmed with an overvoltage threshold of 4250 mV ±10 mV and a 1-second detection delay. This value is fixed and cannot be adjusted externally. The 200-mV hysteresis prevents oscillation near the trip point, ensuring stable release after fault clearance. All BQ7790505PWR units ship with this exact configuration - no calibration or configuration resistors are required.
Does BQ7790505PWR support 6-series or higher battery stacks?
Yes, the BQ7790505PWR supports ≥6-series configurations through daisy-chained stacking. In such setups, the CHGU and DSG outputs of an upper device drive the CTRC and CTRD inputs of the device below it. While BQ7790505PWR itself is configured for up to 5-series monitoring, its stackable interface allows seamless expansion to 20-series or more using identical BQ7790505PWR devices - no additional controllers or firmware needed.
How does the load removal detection (LD) function work on BQ7790505PWR?
The LD pin on BQ7790505PWR detects open-circuit conditions on the PACK– line by monitoring voltage relative to VSS. When LD falls below 1.3 V (typical), the device interprets this as load removal and disables both CHG and DSG drivers. A 1.5-ms deglitch filter prevents false triggering from noise. Unlike some variants, BQ7790505PWR has load removal recovery disabled (N), meaning manual reset or power cycle is required to restore operation.
What is the purpose of the CCFG pin on BQ7790505PWR?
The CCFG pin on BQ7790505PWR selects the number of series-connected cells (3, 4, or 5) by reading a voltage ratio against AVDD. For BQ7790505PWR, CCFG is internally biased to the 5-cell configuration (25–45% AVDD), enabling all five VCx inputs. This pin eliminates external configuration jumpers or resistors, allowing one PCB layout to support multiple cell counts via different part numbers - simplifying inventory and design reuse.
Can BQ7790505PWR operate without an external thermistor?
Yes, BQ7790505PWR can operate without an external thermistor. The TS pin may be left unconnected or tied to AVSS if temperature protection is not required; the internal circuitry disables temperature-based protections automatically. However, the VTB pin remains active and outputs ~3.0 V regardless. For full safety compliance, TI recommends connecting a 10-kΩ NTC thermistor between TS and VSS, referenced to the VTB bias voltage.
BQ7790505PWR 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
BQ7790505PWR FAQ
1.How can I place an order for BQ7790505PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7790505PWR 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 BQ7790505PWR reliable?
The price and inventory of BQ7790505PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7790505PWR is usually 5 days.
3.What payment methods are accepted for BQ7790505PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7790505PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7790505PWR?
BQ7790505PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7790505PWR 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 BQ7790505PWR?
For technical support, including BQ7790505PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7790505PWR requirements.
6.How does Aetrix verify that BQ7790505PWR is sourced from the original manufacturer or authorized distributors?
All BQ7790505PWR 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 BQ7790505PWR meets industry standards.
7.What is the process for return or replacement of BQ7790505PWR?
All BQ7790505PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7790505PWR, 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 BQ7790505PWR part is unused and in its original packaging.
Return procedure for BQ7790505PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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