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Texas Instruments BQ294707DSGT
- Part No.:
- BQ294707DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ294707DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:765
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Product details
Overview
BQ294707DSGT from Texas Instruments is a dedicated 2- to 4-series Li-ion battery overvoltage protection IC with factory-programmed 4.225 V OVP threshold, ±10 mV accuracy, and open-drain active-low output. It monitors each cell independently, uses an external capacitor on the CD pin to set a 1–2 s fault delay, and draws only ~1 µA supply current during normal operation-enabling robust secondary protection in space-constrained battery packs.
For engineers reviewing the BQ294707DSGT datasheet, BQ294707DSGT pinout, BQ294707DSGT application, or BQ294707DSGT equivalent, key selection considerations include its NCH open-drain output configuration, 0.05 V hysteresis, 100 nA per-cell input leakage, WSON-8 (2 mm × 2 mm) package, and support for customer test mode with ≤170 ms reduced delay.
Technical Context
The BQ294707DSGT implements independent analog voltage comparators per cell input (V1–VSS through V4–V3), each referenced to a precision internal bandgap. Its delay timer circuit charges and discharges the external CD capacitor using a fixed-current source, enabling programmable response timing without internal RC components.
Unlike CMOS-active-high variants, the BQ294707DSGT drives OUT low during overvoltage faults and presents high-impedance when inactive-requiring an external pull-up resistor. Its timeout detection on the CD pin ensures fail-safe activation even if the capacitor is shorted or open.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.225 V ±10 mV at 25°C - sets precise cell overvoltage trip point for 4S Li-ion stacks |
| OVP Hysteresis | 50 mV - prevents chatter near trip point; enables clean recovery at 4.175 V |
| Supply Current | ≈1 µA (VCELL(ALL) < VPROTECT) - minimizes parasitic drain in always-on battery protection |
| Per-Cell Input Leakage | <100 nA - preserves cell balance and avoids measurement error in high-impedance sensing networks |
| Delay Timer Range | 1–2 s with 0.1 µF CD capacitor - provides configurable fault response window before fuse activation |
| Operating Temperature | –40°C to +85°C - supports industrial and portable computing environments |
| Output Type | NCH open-drain active-low - interfaces directly with PMOS FET gate for fuse control |
Pinout & Package
Package: 8-pin WSON (DSG), 2.00 mm × 2.00 mm, exposed thermal pad (PowerPAD™) recommended to be connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Unregulated 3–20 V supply rail; requires RC filter for noise immunity |
| 2 - V4 | Cell voltage sense input | Senses positive terminal of topmost (4th) cell in stack; high-impedance analog input |
| 3 - V3 | Cell voltage sense input | Senses positive terminal of 3rd cell; must be shorted to adjacent pin if used in 2S/3S configuration |
| 4 - V2 | Cell voltage sense input | Senses positive terminal of 2nd cell; shares same input structure and leakage spec as V1–V4 |
| 5 - V1 | Cell voltage sense input | Senses positive terminal of lowest cell; referenced to VSS; primary reference for stack bottom |
| 6 - VSS | Ground reference | IC ground and negative terminal of lowest cell; connection point for PowerPAD™ |
| 7 - CD | Delay capacitor interface | Analog node controlling timer discharge; includes open/short fault detection logic |
| 8 - OUT | Fault signal output | NCH open-drain active-low; sinks up to 14 mA; requires external pull-up for logic-level signaling |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed OVP threshold | 4.225 V with ±10 mV accuracy eliminates external calibration and reduces BOM count |
| External capacitor-programmed delay | 1–2 s range via 0.1 µF CD capacitor enables design flexibility without trimming resistors |
| CD pin fault detection | Detects open or shorted delay capacitor and forces immediate OUT activation - critical for safety compliance |
| Customer test mode | Shorting CD to VSS reduces delay to ≤170 ms - accelerates production-line functional testing |
| Ultra-low quiescent current | ~1 µA supply draw extends shelf life and minimizes self-discharge impact on protected packs |
Applications
| Notebook Battery Packs | UPS Battery Backup Systems |
|---|---|
|
Use Scenario: Secondary overvoltage protection layer in multi-cell Li-ion packs powering thin-and-light notebooks with strict thermal and space constraints. IC Role / Device Role / Timing Role: Independent per-cell monitor triggering open-drain fault signal after 1–2 s delay to activate external PMOS fuse switch. Use Value: Prevents cell damage from charger overvoltage events while maintaining <1 µA standby current to avoid pack self-discharge. |
Use Scenario: Safety-critical overvoltage guard in sealed UPS battery modules where field-replaceable packs require certified fault response. IC Role / Device Role / Timing Role: Standby-mode protector that asserts low-going fault flag upon any cell exceeding 4.225 V, enabling controlled shutdown before thermal runaway. Use Value: 50 mV hysteresis ensures stable recovery and 100 nA input leakage preserves long-term cell voltage balance across aging cells. |
| Industrial Portable Test Equipment | Medical Handheld Devices |
|
Use Scenario: Overvoltage safeguard in ruggedized handheld analyzers using 3S Li-ion packs subjected to variable ambient temperatures and infrequent charging cycles. IC Role / Device Role / Timing Role: High-accuracy comparator with temperature-compensated OVP threshold (±40 mV drift over –40°C to +110°C) and fail-safe CD monitoring. Use Value: Enables reliable operation across extended temperature ranges without recalibration; WSON-8 footprint fits tight PCB layouts. |
Use Scenario: Secondary protection in battery-powered medical diagnostics devices requiring IEC 62368-1 compliant fault handling and traceable safety margins. IC Role / Device Role / Timing Role: Certified secondary OV detector with deterministic 1–2 s response window and customer test mode for accelerated QA verification. Use Value: Open-drain output simplifies isolation interface with system MCU; 0.05 V hysteresis meets stringent safety margin requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ294701DSGT | 4.250 V OVP threshold, 300 mV hysteresis, CMOS active-high output | Requires NMOS FET driver instead of PMOS; no external pull-up needed but less flexible for isolated signaling | Select when higher OVP threshold and active-high logic simplify existing fuse-control architecture |
| BQ294705DSGT | 4.450 V OVP threshold, 300 mV hysteresis, CMOS active-high output | Targets higher-voltage Li-ion chemistries (e.g., LiCoO₂ with elevated charge termination); incompatible with 4.225 V systems | Choose only if system requires 4.45 V trip point and can accommodate active-high interface and 300 mV hysteresis |
Compared with BQ294701DSGT and BQ294705DSGT, the BQ294707DSGT offers tighter 50 mV hysteresis and open-drain output-enabling safer, more flexible integration with PMOS-based fuse switches and isolated monitoring circuits in compact battery management designs.
Availability
BQ294707DSGT is available at Aetrix Electronics and suitable for notebook battery packs, UPS backup systems, and industrial portable test equipment requiring stable component supply, long-lifecycle availability, and guaranteed RoHS-compliant sourcing.
Supply support for BQ294707DSGT 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 company delivering analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability ICs.
The BQ2947 family is designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, emphasizing precision, ultra-low power, and fail-safe fault response in space-constrained applications.
FAQ
What is the exact overvoltage protection threshold of the BQ294707DSGT?
The BQ294707DSGT has a factory-programmed overvoltage protection threshold of 4.225 V with ±10 mV accuracy at 25°C. This value is laser-trimmed during manufacturing and remains stable across temperature, with worst-case drift of ±54 mV at 110°C. The BQ294707DSGT does not support user adjustment of this threshold.
How does the BQ294707DSGT handle a shorted or open CD capacitor?
The BQ294707DSGT includes built-in timeout detection on the CD pin. If the external delay capacitor is shorted to VSS or left unconnected (open), the CD pin fails to reach its expected charge level within the timeout window, causing the BQ294707DSGT to immediately assert the active-low OUT signal-ensuring fail-safe overvoltage response regardless of capacitor integrity.
What output configuration does the BQ294707DSGT use, and how should it be interfaced?
The BQ294707DSGT features an NCH open-drain active-low output. During normal operation, OUT is high-impedance; during overvoltage, it pulls low to VSS. An external pull-up resistor (typically 5 kΩ to VDD) is required to establish a defined logic-high state. This configuration enables direct drive of PMOS FET gates for fuse control in battery protection circuits.
Can the BQ294707DSGT be used in 2-cell or 3-cell battery configurations?
Yes, the BQ294707DSGT 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. All unused sense inputs retain the same high-impedance, low-leakage characteristics (<100 nA) as active inputs, ensuring no impact on measurement accuracy or power consumption.
What is the purpose of the Customer Test Mode in the BQ294707DSGT?
The Customer Test Mode in the BQ294707DSGT reduces the overvoltage delay time to ≤170 ms by grounding the CD pin-enabling rapid functional verification during production testing. This mode bypasses the full 1–2 s delay timer while preserving all other protection functionality, allowing efficient validation of fault response without compromising final application timing behavior.
BQ294707DSGT 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)
BQ294707DSGT FAQ
1.How can I place an order for BQ294707DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294707DSGT 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 BQ294707DSGT reliable?
The price and inventory of BQ294707DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294707DSGT is usually 5 days.
3.What payment methods are accepted for BQ294707DSGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294707DSGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294707DSGT?
BQ294707DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294707DSGT 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 BQ294707DSGT?
For technical support, including BQ294707DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294707DSGT requirements.
6.How does Aetrix verify that BQ294707DSGT is sourced from the original manufacturer or authorized distributors?
All BQ294707DSGT 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 BQ294707DSGT meets industry standards.
7.What is the process for return or replacement of BQ294707DSGT?
All BQ294707DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ294707DSGT, 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 BQ294707DSGT part is unused and in its original packaging.
Return procedure for BQ294707DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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