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Texas Instruments BQ7790512PWR
- Part No.:
- BQ7790512PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7790512PWR.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,960
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Product details
Overview
BQ7790512PWR from Texas Instruments is a 3- to 5-series ultra-low-power 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 supports cascaded stackable configurations up to 20-series cells - used in power tools, light EVs, and 10.8–72-V energy storage systems.
For engineers reviewing the BQ7790512PWR datasheet, BQ7790512PWR pinout, BQ7790512PWR application, or BQ7790512PWR equivalent, key selection criteria include its 4175 mV overvoltage threshold with 1 s delay, 2800 mV undervoltage threshold with 400 mV hysteresis, 150 mV overcurrent discharge 2 trigger, and integrated low-side CHG/DSG NMOS drivers for direct FET control in battery pack protection circuits.
Technical Context
The BQ7790512PWR operates as a primary hardware-based protector in standalone or stacked topologies, using internal comparators and fixed-delay timers to autonomously enforce safety thresholds. Its architecture includes independent CHG and DSG drivers, CTRC/CTRD cascade control inputs, and thermistor-based temperature sensing via TS/VTB pins with configurable thresholds referenced to VTB.
It supports 3–5 series cell configurations natively (CCFG pin detects 5-cell mode), and scales beyond via daisy-chained CHGU→CTRC signaling between stacked devices. All protection events - OV, UV, OCD1/OCD2, SCD, OTD/OTC, UTD/UTC, OW - use factory-trimmed thresholds and non-volatile timing settings, eliminating external configuration components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold | 4175 mV ±10 mV - triggers cell disconnect at precise 4.175 V per cell to prevent Li-ion degradation |
| Undervoltage Threshold | 2800 mV ±18 mV with 400 mV hysteresis - prevents deep discharge while avoiding false trips during load transients |
| OCD2 Detection | 150 mV (VSRP–VSRN) with 350 ms delay - enables fast response to moderate overcurrents before thermal runaway |
| Normal Mode Current | 6 µA typical - sustains multi-year operation on small backup batteries or parasitic-sense applications |
| Shutdown Current | 0.5 µA max - ensures minimal leakage when pack is inactive or in storage |
| Cell Count Support | 3–5 series native; scalable to ≥20 series via stackable interface - eliminates need for custom firmware in high-cell-count packs |
| Temperature Protection | OTD = 65°C, OTC = 45°C, UTD = –20°C, UTC = 0°C - dual-threshold charge/discharge separation improves safety margin and cycle life |
Pinout & Package
Package: TSSOP-20 (6.50 mm × 4.40 mm), RoHS-compliant, surface-mount, rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 3–25 V; powers internal logic and drivers; POR at 4 V, shutdown at ≤3.25 V |
| VC1–VC5 | Cell voltage sense inputs | Monitor individual cell voltages; VC5 must be tied to VC4 for BQ77904, but enabled for 5-cell operation in BQ7790512PWR |
| SRP/SRN | Current sense differential inputs | Measure (VSRP – VSRN) for OCD1/OCD2/SCD detection; full-scale range –340 mV to +340 mV |
| CHG/DSG | Low-side NMOS FET drivers | Drive external CHG/DSG FET gates directly; output clamped to 12–14 V; off-state resistance 0.5 kΩ (CHG), 10–16 Ω (DSG) |
| CTRC/CTRD | Cascade control inputs | Accept CHGU signal from upper device to enable/disable CHG/DSG in stacked configurations |
| TS/VTB | Thermistor interface | TS reads NTC voltage; VTB supplies 3.25 V bias - enables accurate temperature thresholds via resistor divider |
| LD | Load removal detection | Detects open PACK– connection; triggers fault if voltage drops below 1.3 V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Stackable architecture | Enables 3–20+ series cell protection with no inter-device communication bus - reduces BOM and layout complexity vs. daisy-chain ICs |
| Independent CHG/DSG control | Allows selective disable of charge or discharge path during faults - preserves partial functionality (e.g., allow charging while blocking discharge) |
| Factory-programmed thresholds | Eliminates external resistors or EEPROM programming - ensures consistent, production-ready behavior across batches |
| Open-wire detection | Identifies broken cell interconnects by monitoring VCx-to-VC(x−1) voltage drop - prevents unsafe operation due to floating cells |
| Functional safety documentation | Includes FIT rate, failure modes, and diagnostic coverage data - accelerates ISO 26262 or IEC 61508 system-level certification |
Applications
| Power Tools | Light Electric Vehicles |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs with 10.8–36 V nominal voltage and high pulse discharge currents. IC Role / Device Role / Timing Role: Primary hardware protector enforcing cell-level OV/UV limits and short-circuit cutoff within 400 µs (SCD) or 350 ms (OCD2). Use Value: Prevents thermal runaway during stall conditions while maintaining 6 µA quiescent draw to extend shelf life between uses. |
Use Scenario: 48 V e-bike or scooter battery modules requiring robust overtemperature protection during hill climbs. IC Role / Device Role / Timing Role: Monitors pack temperature via NTC and disables discharge at 65°C (OTD) with 4.5 s delay to avoid nuisance trips. Use Value: Enables safe continuous discharge up to 70°C ambient by decoupling OTD/OTC thresholds - extends usable range without derating. |
| Energy Storage Systems | Start-Stop Automotive Batteries |
|
Use Scenario: Residential 48 V LiFePO₄ or NMC battery banks with 200+ cycle life requirements and remote monitoring. IC Role / Device Role / Timing Role: Stacked BQ7790512PWR units provide per-cell voltage supervision and open-wire fault detection across 16–20 series strings. Use Value: Detects intercell weld failures early via 500 mV open-wire threshold - avoids catastrophic imbalance in large-format packs. |
Use Scenario: 12 V start-stop replacement packs using 3–4 Li-ion cells, replacing lead-acid with higher energy density. IC Role / Device Role / Timing Role: Enforces 2.8 V/cell undervoltage cutoff with 400 mV hysteresis to prevent irreversible capacity loss during engine cranking dips. Use Value: Maintains >95% depth-of-discharge usability while guaranteeing 2000+ cycles through precise UV recovery behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7790503PWR | OV = 4200 mV, UV = 2700 mV, OCD2 = 160 mV, OTD/OTC = 70°C/50°C, UTD/UTC = –20°C/–5°C | Higher overvoltage threshold suits higher-voltage NMC cells; wider temperature margins for industrial environments | Select BQ7790503PWR when targeting 4.20 V/cell nominal operation or needing extended OTD/UTC ranges |
| BQ7790511PWR | OV = 4250 mV, UV = 2700 mV, OCD2 = 120 mV, OTD/OTC = 65°C/45°C, UTD/UTC = –20°C/0°C, OCD2 delay = 90 ms | Faster OCD2 response (90 ms vs. 350 ms) and tighter OV tolerance for high-reliability medical or aerospace packs | Choose BQ7790511PWR for time-critical overcurrent protection where sub-100 ms reaction is mandatory |
Compared with BQ7790512PWR, BQ7790503PWR offers higher OV/UV setpoints and broader temperature thresholds ideal for ruggedized designs, while BQ7790511PWR prioritizes faster OCD2 response at the cost of reduced delay margin - enabling trade-offs between safety margin and fault reaction speed.
Availability
BQ7790512PWR 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 traceable sourcing.
Supply support for BQ7790512PWR 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 decades of experience in battery management solutions.
The BQ77905 family belongs to TI's dedicated battery protector IC product line, designed specifically for cost-sensitive, high-reliability lithium-ion pack protection without microcontroller dependency.
FAQ
What is the overvoltage protection threshold programmed in the BQ7790512PWR?
The BQ7790512PWR has a factory-programmed overvoltage threshold of 4175 mV ±10 mV with a 1-second detection delay. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The threshold applies per monitored cell and is used to disconnect the charge FET when any cell exceeds this voltage, preventing lithium plating and electrolyte decomposition in Li-ion cells.
Does the BQ7790512PWR support 5-series battery configurations?
Yes, the BQ7790512PWR supports native 3–5 series cell configurations. The CCFG pin detects 5-cell mode when biased to a high-impedance state (25–45% of AVDD), enabling VC5 as an active cell sense input. This allows direct monitoring of five individual cells without stacking - confirmed in Table 5-2 of the SLUSCM3K datasheet for part number BQ7790512.
How does the BQ7790512PWR handle open-wire faults?
The BQ7790512PWR detects open-wire faults by monitoring voltage differentials between adjacent cell sense inputs (e.g., VC2–VC1). A falling VCx voltage below 500 mV relative to VC(x−1) triggers an open-wire fault after 4.5 seconds. The device then disables both CHG and DSG FETs and asserts a latched fault condition - critical for identifying broken interconnects before cell imbalance escalates.
Can the BQ7790512PWR be used in stacked configurations?
Yes, the BQ7790512PWR supports stacking via its CHGU, CTRC, and CTRD pins. In a stack, the upper device drives CHGU to the CTRC pin of the lower device, allowing coordinated CHG/DSG control across multiple ICs. Up to four BQ7790512PWR devices can be cascaded to protect battery packs with 6–20 series cells - validated in the device's functional description and simplified schematic.
What is the purpose of the LD pin on the BQ7790512PWR?
The LD (Load Detection) pin on the BQ7790512PWR monitors the PACK– connection for disconnection events. When the voltage at LD falls below 1.3 V (with 1.5 ms deglitch), the device interprets this as load removal and disables the DSG FET to prevent uncontrolled discharge through parasitic paths. This feature safeguards against reverse current flow when the pack is disconnected from the load.
BQ7790512PWR 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
BQ7790512PWR FAQ
1.How can I place an order for BQ7790512PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7790512PWR 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 BQ7790512PWR reliable?
The price and inventory of BQ7790512PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7790512PWR is usually 5 days.
3.What payment methods are accepted for BQ7790512PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7790512PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7790512PWR?
BQ7790512PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7790512PWR 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 BQ7790512PWR?
For technical support, including BQ7790512PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7790512PWR requirements.
6.How does Aetrix verify that BQ7790512PWR is sourced from the original manufacturer or authorized distributors?
All BQ7790512PWR 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 BQ7790512PWR meets industry standards.
7.What is the process for return or replacement of BQ7790512PWR?
All BQ7790512PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7790512PWR, 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 BQ7790512PWR part is unused and in its original packaging.
Return procedure for BQ7790512PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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