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Texas Instruments BQ294703DSGT
- Part No.:
- BQ294703DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ294703DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,604
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Product details
Overview
BQ294703DSGT from Texas Instruments is a dedicated 4-series Li-ion battery overvoltage protection IC with factory-programmed 4.325 V threshold, ±10 mV accuracy, external capacitor-programmed delay timer (1–2 s), and active-high CMOS output. It monitors each cell independently and triggers fault response only after confirmed overvoltage persists beyond the delay window-used in notebook battery packs to prevent thermal runaway during charging faults.
For engineers reviewing the BQ294703DSGT datasheet, BQ294703DSGT pinout, BQ294703DSGT application, or BQ294703DSGT equivalent, this page delivers verified specifications, validated pin functions, real-world implementation context for 2S–4S Li-ion packs, and confirmed alternative options for overvoltage protection in portable power systems.
Technical Context
The BQ294703DSGT implements independent per-cell voltage sensing across four differential inputs (V1–VSS to V4–V3), compares each against a fixed 4.325 V OVP threshold, and initiates an external RC-based delay timer on any violation. Its internal timeout detection ensures fault response even if the CD capacitor is open or shorted.
It operates from 3 V to 20 V supply, draws only 1 µA quiescent current when all cells are below threshold, and maintains <100 nA leakage per sense input-enabling long-term battery pack standby without significant self-discharge impact.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.325 V ±10 mV at 25°C; fixed factory setting enables precise, repeatable cell voltage cutoff without calibration. |
| OV Hysteresis | 300 mV; prevents chatter during recovery by requiring cell voltage to drop to 4.025 V before clearing fault. |
| Delay Timer Range | 1–2 s with 0.1 µF CD capacitor; programmable via external component to match fuse blow timing requirements. |
| Supply Current | ≈1 µA when all cells < VPROTECT; minimizes parasitic drain in battery pack standby mode. |
| Sense Input Leakage | <100 nA per cell input; preserves cell voltage integrity and avoids measurement error in high-impedance monitoring paths. |
| Operating Temp | –40°C to +85°C; qualified for consumer-grade notebook and UPS battery pack environments. |
| Output Type | CMOS Active High; drives NMOS FET gate directly to short fuse to ground without external pull-up. |
Pinout & Package
Package: 8-pin WSON (DSG), 2.00 mm × 2.00 mm, exposed thermal pad connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated 3–20 V input; requires series resistor and bypass capacitor for noise filtering and current limiting. |
| V4 | Cell 4 sense input | Differential input for top cell (V4–V3); must be filtered with 1 kΩ/0.1 µF RC network per TI layout guidelines. |
| V3 | Cell 3 sense input | Differential input for third cell (V3–V2); shares same RC filter spec as V4, V2, and V1. |
| V2 | Cell 2 sense input | Differential input for second cell (V2–V1); unused pins in 2S/3S configs must be shorted per Figure 8-2/8-3. |
| V1 | Cell 1 sense input | Differential input for lowest cell (V1–VSS); referenced directly to IC ground and pack negative terminal. |
| VSS | Ground reference | IC ground and electrically tied to pack negative; thermal pad must be soldered to VSS PCB plane for thermal performance. |
| CD | Delay capacitor connection | Analog output driving external 0.1 µF capacitor; includes open/short fault detection to ensure fail-safe OV response. |
| OUT | Fault signal output | CMOS Active High output; sinks ≥4.5 mA when active, drives NMOS gate directly to trigger fuse blow path. |
Key Features
| Feature | Design Value |
|---|---|
| Per-cell independent monitoring | Four isolated sense inputs enable true 4S protection without shared reference errors or cascaded failure modes. |
| Factory-trimmed OVP threshold | 4.325 V ±10 mV eliminates need for external resistive dividers or system-level calibration in production. |
| CD pin fault detection | Detects open or shorted delay capacitor and forces OUT active-ensuring no single-point failure disables protection. |
| Customer Test Mode | Shorting CD to VSS reduces delay to ≤170 ms, enabling rapid functional verification on production line without full timing test. |
| Ultra-low leakage inputs | <100 nA per Vx pin prevents cell voltage drift and maintains accuracy in multi-year battery pack storage. |
Applications
| Notebook Battery Packs | UPS Backup Systems |
|---|---|
Use Scenario: Monitors 3S or 4S Li-ion cells during AC charging to prevent overvoltage-induced thermal runaway. IC Role / Device Role / Timing Role: Second-level hardware OVP protector; triggers within 1–2 s of sustained overvoltage to activate fuse-blow FET. Use Value: Adds deterministic, analog-hardened safety layer independent of host MCU firmware-critical for UL/IEC 62133 compliance. |
Use Scenario: Protects sealed lead-acid or Li-ion backup batteries in enterprise UPS units during extended grid outage recharging. IC Role / Device Role / Timing Role: Standalone cell voltage supervisor; activates fault signal only after verified delay, avoiding nuisance trips from transient spikes. Use Value: Enables reliable long-term unattended operation with <1 µA supply current and –40°C to +85°C qualification. |
| Industrial Portable Tools | Medical Portable Devices |
Use Scenario: Secures high-power 4S Li-ion packs in cordless power tools subjected to rapid charge/discharge cycles and mechanical shock. IC Role / Device Role / Timing Role: Independent analog OVP monitor; uses CD pin timeout detection to guarantee response even if external capacitor fails. Use Value: Prevents catastrophic cell venting under abusive conditions-meeting IEC 62133 mechanical abuse test requirements. |
Use Scenario: Safeguards Li-ion battery packs in portable infusion pumps and diagnostic handhelds where battery failure risks patient safety. IC Role / Device Role / Timing Role: Fail-safe hardware protector with ±10 mV OVP accuracy and 300 mV hysteresis to avoid false triggers during load transients. Use Value: Supports ISO 13485 design controls with documented, traceable analog protection-no software dependency required. |
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 (vs. 4.325 V); otherwise identical specs, pinout, and timing behavior. | Suitable for higher-voltage Li-ion chemistries (e.g., NMC with 4.4 V max) where tighter margin above standard 4.35 V is needed. | Select BQ294704DSGT only if system requires 4.400 V trip point; no layout or firmware changes needed. |
| BQ294702DSGT | OVP threshold = 4.300 V (vs. 4.325 V); same hysteresis, delay, and package. | Preferred for conservative protection of aging Li-ion cells or low-tolerance battery management architectures. | Choose BQ294702DSGT when tighter OVP margin (4.300 V) improves safety margin without altering circuit design. |
Compared with BQ294703DSGT, BQ294704DSGT raises the trip point by +75 mV for higher-voltage cells, while BQ294702DSGT lowers it by –25 mV for enhanced aging tolerance-both retain identical timing, leakage, and thermal specs, enabling direct substitution based solely on OVP threshold requirement.
Availability
BQ294703DSGT is available at Aetrix Electronics and suitable for notebook battery packs, UPS backup systems, and industrial portable tools requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant WSON packaging.
Supply support for BQ294703DSGT 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 accuracy, fail-safe timing, and ultra-low power consumption for safety-critical portable energy systems.
FAQ
What is the exact overvoltage protection threshold for BQ294703DSGT?
The BQ294703DSGT has a factory-programmed overvoltage protection threshold of 4.325 V with ±10 mV accuracy at 25°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The device maintains this specification across its full operating temperature range of –40°C to +85°C, with drift bounded per datasheet Table 6.5 (VOADRIFT).
Does BQ294703DSGT support 2-cell or 3-cell battery configurations?
Yes, BQ294703DSGT supports 2S, 3S, and 4S Li-ion configurations. For 2S operation, pins V3 and V4 must be shorted to V2; for 3S, pin V4 must be shorted to V3-per TI's Figure 8-2 and Figure 8-3. All unused sense inputs retain full electrical integrity and do not affect OVP accuracy or timing behavior.
How does the CD pin fault detection work in BQ294703DSGT?
The BQ294703DSGT continuously monitors the CD pin for valid charge/discharge behavior. If the external capacitor is open-circuited (no voltage rise) or shorted to VSS (no discharge), the internal timeout circuit detects the anomaly within milliseconds and forces the OUT pin active-ensuring protection remains functional even with CD component failure.
What is the recommended external capacitor value for the CD pin on BQ294703DSGT?
Texas Instruments specifies a nominal 0.1 µF capacitor for the CD pin on BQ294703DSGT to achieve a 1–2 s overvoltage delay (tCD). The actual delay follows tCD (s) = K × CCD (µF), where K = 10–20. A 0.1 µF X7R ceramic capacitor with ±10% tolerance is recommended to meet the 1.5 s typical delay target stated in datasheet Table 6.5.
Can BQ294703DSGT be used with lithium iron phosphate (LiFePO₄) battery packs?
No-BQ294703DSGT is optimized for Li-ion chemistries with OVP thresholds centered at 4.325 V. LiFePO₄ cells have lower nominal voltages (~3.2 V) and typical max charge voltages of 3.6–3.65 V; using BQ294703DSGT would result in premature, continuous fault triggering. TI's BQ296xxx or BQ77xx families are intended for LiFePO₄-specific protection.
BQ294703DSGT 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)
BQ294703DSGT FAQ
1.How can I place an order for BQ294703DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294703DSGT 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 BQ294703DSGT reliable?
The price and inventory of BQ294703DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294703DSGT is usually 5 days.
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Once your BQ294703DSGT 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 BQ294703DSGT?
For technical support, including BQ294703DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294703DSGT requirements.
6.How does Aetrix verify that BQ294703DSGT is sourced from the original manufacturer or authorized distributors?
All BQ294703DSGT 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 BQ294703DSGT meets industry standards.
7.What is the process for return or replacement of BQ294703DSGT?
All BQ294703DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ294703DSGT, 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 BQ294703DSGT part is unused and in its original packaging.
Return procedure for BQ294703DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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