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Texas Instruments BQ294708DSGT
- Part No.:
- BQ294708DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ294708DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:960
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Product details
Overview
BQ294708DSGT from Texas Instruments is a dedicated 4-series Li-ion battery overvoltage protection IC with factory-programmed 4.500 V OVP threshold, ±10 mV accuracy, and external capacitor–programmed delay timer (1–2 s with 0.1 µF). It operates across –40°C to +85°C and drives an active-high CMOS output to control external FETs for fuse-blowing in notebook and UPS battery packs.
For engineers reviewing the BQ294708DSGT datasheet, BQ294708DSGT pinout, BQ294708DSGT application, or BQ294708DSGT equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior under OV fault, leakage current specs per cell input (<100 nA), and validated alternative parts for second-level battery pack protection design.
Technical Context
The BQ294708DSGT implements independent per-cell voltage monitoring across four series-connected Li-ion cells using analog sense inputs (V1–V4) referenced to VSS. Its internal comparator compares each cell's differential voltage against a fixed 4.500 V factory-trimmed threshold with 300 mV hysteresis.
Upon detection of any cell exceeding 4.500 V, the device initiates a delay timer via the CD pin, charging then discharging an external capacitor; output activation occurs only after full discharge below threshold-ensuring immunity to transient spikes. The OUT pin asserts high (CMOS) with 4.5 mA source capability and <400 mV low-state voltage at 100 µA sink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.500 V ±10 mV at 25°C - ensures precise cell voltage cutoff before electrolyte decomposition in 4S Li-ion stacks. |
| OV Hysteresis | 300 mV - prevents oscillation during recovery by requiring cell voltage to drop to 4.200 V before reset. |
| Delay Timer Range | 1–2 s with 0.1 µF CD capacitor - configurable timing window to distinguish sustained overcharge from brief transients. |
| Supply Current | ≈1 µA at VCELL(ALL) < VPROTECT - enables ultra-low-power always-on monitoring in battery-backed systems. |
| Input Leakage | <100 nA per Vx pin - minimizes self-discharge impact on individual cell voltages in long-term storage. |
| Operating Temp | –40°C to +85°C - supports industrial-grade reliability in portable computing and backup power environments. |
| Output Drive | CMOS Active High, 4.5 mA source / 0.5–14 mA sink - directly interfaces with NMOS gate drivers without level-shifting. |
Pinout & Package
8-pin WSON (DSG) package, 2.00 mm × 2.00 mm footprint with exposed thermal pad connected to VSS. Compact size enables integration into space-constrained battery management modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated 3–20 V input; requires RC filter (1 kΩ + 0.1 µF) for noise immunity and current limiting. |
| V4 | Sense input (cell 4+) | Monitors positive terminal of topmost cell in 4S stack; must be filtered with 1 kΩ/0.1 µF network. |
| V3 | Sense input (cell 3+) | Monitors positive terminal of third cell; unused pins in 2S/3S configs must be shorted to adjacent lower potential. |
| V2 | Sense input (cell 2+) | Monitors positive terminal of second cell; shares same RC filter requirements as V3/V4. |
| V1 | Sense input (cell 1+) | Monitors positive terminal of lowest cell; referenced to VSS, not ground-critical for accurate differential sensing. |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; exposed thermal pad must be soldered to VSS PCB plane. |
| CD | Delay capacitor node | Connects to external 0.1–1.0 µF capacitor; includes open/short fault detection to force immediate OUT assertion. |
| OUT | Fault signal output | CMOS Active High: drives high (≥6 V at 100 µA) upon OV confirmation; sinks up to 14 mA when pulled low externally. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP | Fixed 4.500 V threshold eliminates external resistor trimming and improves production consistency in 4S Li-ion packs. |
| Capacitor-programmed delay | 1–2 s delay with 0.1 µF CD capacitor provides field-configurable response time without firmware or digital logic. |
| CD pin fault detection | Detects open or shorted delay capacitor and triggers immediate OUT assertion-ensures fail-safe operation during component failure. |
| Customer test mode | Shorting CD to VSS reduces delay to ≤170 ms, enabling rapid functional verification on production lines without full OV stress testing. |
| Ultra-low leakage | <100 nA per cell input preserves state-of-charge accuracy and extends shelf life in multi-cell battery modules. |
Applications
| Notebook Battery Packs | UPS Backup Systems |
|---|---|
Use Scenario: Monitors four series Li-ion cells in slim-profile laptop battery modules where thermal headroom and PCB area are constrained. IC Role / Device Role / Timing Role: Second-level hardware OVP monitor that independently validates each cell voltage and triggers fuse blow via NMOS gate drive after programmable delay. Use Value: Prevents thermal runaway by cutting power before any single cell exceeds 4.500 V, leveraging ±10 mV accuracy and 300 mV hysteresis for stable trip/release behavior. |
Use Scenario: Integrated into rack-mount or desktop UPS battery cartridges requiring robust overvoltage protection during AC charger faults or BMS communication loss. IC Role / Device Role / Timing Role: Standalone analog protector that remains operational even if primary BMS fails, asserting fault signal within 2 s of sustained overvoltage. Use Value: Ensures fail-operational safety with CD pin open/short detection-guarantees OUT activation even if external capacitor is missing or shorted during field use. |
| Medical Portable Devices | Industrial Handheld Terminals |
Use Scenario: Powers battery packs in FDA-cleared portable diagnostic tools where regulatory compliance demands redundant, analog-based voltage supervision. IC Role / Device Role / Timing Role: Independent hardware guardrail that operates outside microcontroller control loop, providing deterministic response to overvoltage events. Use Value: Delivers <100 nA per-cell leakage and –40°C to +85°C operation-preserving calibration integrity and runtime in temperature-variable clinical environments. |
Use Scenario: Embedded in ruggedized handheld scanners and data collectors used in warehouses with frequent charge cycles and mechanical shock exposure. IC Role / Device Role / Timing Role: Cell-level protector interfacing with discrete NMOS switch to isolate battery during overvoltage, enabled by 4.5 mA CMOS output drive. Use Value: Enables direct gate drive without level shifters or pull-up resistors-reducing BOM count and improving layout reliability in vibration-prone assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ294704DSGT | OVP threshold = 4.400 V (100 mV lower); identical pinout, timing, and leakage specs. | Better suited for Li-ion chemistries with lower max cell voltage (e.g., LFP-influenced blends or aged cells). | Select when system-level validation confirms safe operation at 4.400 V trip point without compromising safety margin. |
| BQ294706DSGT | OVP threshold = 4.550 V (50 mV higher); same package, accuracy, and delay architecture. | Targets newer high-voltage NMC cells rated for 4.55 V upper limit; requires updated fuse and FET derating. | Choose only if battery manufacturer specifies 4.55 V absolute maximum and thermal modeling confirms safe energy dissipation during fuse blow. |
Compared with BQ294708DSGT, BQ294704DSGT offers earlier intervention for conservative voltage margins, while BQ294706DSGT allows tighter utilization of high-voltage cell capacity-both retain identical timing, leakage, and interface behavior, enabling drop-in replacement with threshold revalidation.
Availability
BQ294708DSGT is available at Aetrix Electronics and suitable for notebook battery packs, UPS backup systems, and medical portable devices requiring stable component supply with guaranteed long-term manufacturability.
Supply support for BQ294708DSGT 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 precision analog ICs.
The BQ2947 family is designed specifically for second-level hardware overvoltage protection in multi-cell Li-ion battery packs-delivering factory-trimmed thresholds, capacitor-programmable timing, and fail-safe fault detection without MCU dependency.
FAQ
What is the exact overvoltage protection threshold for BQ294708DSGT?
The BQ294708DSGT has a factory-programmed overvoltage protection threshold of 4.500 V, with ±10 mV accuracy at 25°C and ±54 mV drift over the full –40°C to +110°C operating range. This value is laser-trimmed during manufacturing and cannot be adjusted externally-ensuring consistent trip points across production lots without calibration.
How does the CD pin function in BQ294708DSGT during an overvoltage event?
In BQ294708DSGT, the CD pin connects to an external capacitor that sets the overvoltage delay timer. When any cell exceeds 4.500 V, the internal circuit charges the capacitor, then discharges it linearly; OUT activates only after discharge completes. The CD pin also detects open or shorted capacitors and forces immediate OUT assertion-guaranteeing fault response even with capacitor failure.
Can BQ294708DSGT be used in 2-series or 3-series Li-ion configurations?
Yes, BQ294708DSGT supports 2S and 3S configurations. For 2S operation, V3 and V4 pins must be shorted to V2; for 3S, V4 must be shorted to V3. All unused sense inputs retain their specified leakage (<100 nA) and do not affect accuracy-TI provides explicit schematics for both configurations in the official datasheet.
What is the maximum recommended external capacitor value for the CD pin on BQ294708DSGT?
The datasheet specifies a maximum external capacitor value of 1.0 µF for the CD pin on BQ294708DSGT. Using larger values extends delay beyond the validated 1–2 s range and may compromise timing predictability due to increased tolerance impact and parasitic effects-TI characterizes performance only up to 1.0 µF.
Does BQ294708DSGT require external pull-up or pull-down resistors on the OUT pin?
No, BQ294708DSGT uses a CMOS Active High output configuration, so no external pull-up or pull-down resistor is required on the OUT pin. The IC drives high (≥6 V at 100 µA) during fault and actively pulls low (<400 mV at 100 µA) when inactive-enabling direct connection to NMOS gate drivers without additional components.
BQ294708DSGT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 2 ~ 4
- Fault Protection:
- Over Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
BQ294708DSGT FAQ
1.How can I place an order for BQ294708DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294708DSGT 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 BQ294708DSGT reliable?
The price and inventory of BQ294708DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294708DSGT is usually 5 days.
3.What payment methods are accepted for BQ294708DSGT?
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BQ294708DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294708DSGT 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 BQ294708DSGT?
For technical support, including BQ294708DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294708DSGT requirements.
6.How does Aetrix verify that BQ294708DSGT is sourced from the original manufacturer or authorized distributors?
All BQ294708DSGT 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 BQ294708DSGT meets industry standards.
7.What is the process for return or replacement of BQ294708DSGT?
All BQ294708DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ294708DSGT, 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 BQ294708DSGT part is unused and in its original packaging.
Return procedure for BQ294708DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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