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Texas Instruments BQ294704DSGT
- Part No.:
- BQ294704DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ294704DSGT.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:900
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Product details
Overview
BQ294704DSGT from Texas Instruments is a dedicated 4-series Li-ion battery overvoltage protection IC with factory-programmed 4.400 V OVP threshold, ±10 mV accuracy, external capacitor-programmed delay timer (1–2 s with 0.1 µF), and CMOS active-high output. It independently monitors each cell voltage and triggers fault response upon any cell exceeding threshold-used in notebook battery packs and UPS backup systems.
For engineers reviewing the BQ294704DSGT datasheet, BQ294704DSGT pinout, BQ294704DSGT application, or BQ294704DSGT equivalent, key selection criteria include its 4.400 V fixed OVP level, 8-pin WSON package, 1 µA quiescent current, <100 nA per-cell leakage, and integrated CD-pin timeout detection for open/shorted capacitor fault coverage.
Technical Context
The BQ294704DSGT implements independent analog voltage comparators per cell input (V1–VSS to V4–V3), with a precision bandgap reference and factory-trimmed OVP threshold of exactly 4.400 V. Its delay timer uses an external capacitor on the CD pin, with internal charge/discharge circuitry that validates capacitor integrity before and during discharge.
It operates across –40°C to +85°C, supports 2S–4S configurations (unused pins shorted for lower series), and delivers CMOS active-high output drive capable of sourcing 4.5 mA at VDD = 14.4 V-designed to directly control an NMOS fuse-switching FET without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.400 V ±10 mV at 25°C - sets precise cell overvoltage trip point for 4S Li-ion stacks |
| OV Hysteresis | 300 mV - prevents chatter near trip point; recovery occurs at 4.100 V |
| Quiescent Current | ≈1 µA when all cells < VPROTECT - enables ultra-low-power battery pack monitoring |
| Per-Cell Input Leakage | <100 nA - minimizes self-discharge impact on cell balancing and long-term pack standby |
| 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 - qualified for consumer and industrial portable power applications |
| Supply Voltage Range | 3 V to 20 V - accommodates full 4S Li-ion stack voltage (up to ~16.8 V) plus margin |
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 |
|---|---|---|
| VDD | Power supply input | Unregulated input (3–20 V); powers internal circuitry and bias network |
| V4 | Cell voltage sense input | Senses positive terminal of top (4th) cell in stack; requires RC filter for noise immunity |
| V3 | Cell voltage sense input | Senses positive terminal of 3rd cell; used only in 3S/4S configurations |
| V2 | Cell voltage sense input | Senses positive terminal of 2nd cell; required for ≥2S operation |
| V1 | Cell voltage sense input | Senses positive terminal of lowest cell; referenced to VSS |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must connect to PowerPAD™ |
| CD | External delay capacitor node | Connects to timing capacitor; includes open/short fault detection logic |
| OUT | Fault signal output | CMOS active-high output; drives NMOS gate directly (4.5 mA sink/source capability) |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed OVP threshold | Fixed 4.400 V with ±10 mV accuracy - eliminates external resistor trimming and improves production consistency |
| CD-pin capacitor fault detection | Detects open or shorted CD capacitor and forces immediate OUT activation - ensures fail-safe behavior under component failure |
| Customer test mode | Shorting CD to VSS reduces delay to ≤170 ms - accelerates production-line OV functional testing |
| Low-input-leakage sensing | <100 nA per Vx pin - preserves cell voltage stability and avoids interference with passive balancing networks |
| Thermal pad integration | Exposed PowerPAD™ tied to VSS - improves thermal dissipation and PCB-level reliability in compact battery modules |
Applications
| Notebook Battery Packs | UPS Battery Backup Systems |
|---|---|
|
Use Scenario: Monitors individual cell voltages in multi-cell Li-ion packs within slim-profile notebooks to prevent overcharging during AC adapter charging cycles. IC Role / Device Role / Timing Role: Second-level hardware OVP protector; triggers within 1–2 s of sustained >4.400 V on any cell to disable charging path via external NMOS switch. Use Value: Prevents thermal runaway by enforcing strict per-cell voltage limits independent of host MCU supervision. |
Use Scenario: Protects sealed 4S Li-ion backup batteries in enterprise-grade UPS units during extended grid-connected float charging. IC Role / Device Role / Timing Role: Standalone analog OVP monitor with no firmware dependency; activates fault signal after programmable delay to avoid transient false trips. Use Value: Ensures battery safety compliance (IEC 62133) without requiring system-level software intervention or calibration. |
| Industrial Portable Test Equipment | Medical Portable Monitoring Devices |
|
Use Scenario: Secures rechargeable 4S battery modules in handheld multimeters and oscilloscopes subjected to variable ambient temperatures and infrequent use. IC Role / Device Role / Timing Role: Low-power (1 µA) voltage supervisor; maintains continuous monitoring during device sleep modes without draining battery reserve. Use Value: Extends shelf life and operational readiness while guaranteeing OVP response remains accurate across –40°C to +85°C. |
Use Scenario: Safeguards critical-care battery packs in portable ECG and pulse oximeters where battery failure could compromise patient monitoring continuity. IC Role / Device Role / Timing Role: Hardware-enforced OVP layer operating in parallel with battery management firmware; provides redundant safety cutoff. Use Value: Meets IEC 60601-1 essential performance requirements for battery-powered medical devices through deterministic analog fault response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ294705DSGT | OVP threshold = 4.450 V (50 mV higher); same accuracy, package, and timing | Used where tighter upper voltage margin is needed for high-capacity NMC cells | Select if system requires higher trip point than 4.400 V but retains identical layout and timing behavior |
| BQ294703DSGT | OVP threshold = 4.325 V (75 mV lower); otherwise identical electrical and mechanical specs | Preferred for LCO or older-generation Li-ion cells with lower safe charging limits | Choose when nominal cell voltage ceiling is 4.325 V and compatibility with existing 4.400 V design is not required |
Compared with BQ294704DSGT, BQ294705DSGT raises the OVP threshold for higher-voltage cell chemistries, while BQ294703DSGT lowers it for legacy Li-ion formulations-both retain identical pinout, timing, leakage, and thermal characteristics, enabling drop-in replacement with only threshold recalibration in system firmware.
Availability
BQ294704DSGT is available at Aetrix Electronics and suitable for notebook battery packs, UPS backup systems, and industrial portable test equipment requiring stable component supply and long-term lifecycle support.
Supply support for BQ294704DSGT 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 specializing in analog and embedded processing technologies, with leadership in battery management and power solutions.
The BQ2947 family was designed specifically for second-level hardware overvoltage protection in multi-cell Li-ion battery packs-prioritizing precision, low power, and fail-safe operation without MCU dependency.
FAQ
What is the exact overvoltage protection threshold of the BQ294704DSGT?
The BQ294704DSGT has a factory-programmed overvoltage protection threshold of exactly 4.400 V, with a tolerance of ±10 mV at 25°C. This value is laser-trimmed during manufacturing and does not require external resistors or configuration. The BQ294704DSGT maintains this accuracy across temperature, with drift up to ±54 mV at 110°C-verified in TI's Electrical Characteristics table.
Does the BQ294704DSGT support 2-cell or 3-cell battery configurations?
Yes, the BQ294704DSGT supports 2S, 3S, and 4S Li-ion configurations. For 2S operation, V3 and V4 pins are shorted to V2; for 3S, V4 is shorted to V3. The device automatically adapts sensing range and retains full OVP functionality. All unused sense inputs must be connected per TI's Figure 8-2 and Figure 8-3 reference schematics to ensure valid operation of the BQ294704DSGT.
How does the CD pin function in the BQ294704DSGT, and what capacitor value is recommended?
The CD pin on the BQ294704DSGT connects to an external capacitor that sets the overvoltage delay time. With a 0.1 µF capacitor, the BQ294704DSGT delivers a nominal 1–2 s delay before activating the OUT pin. The CD pin also includes built-in open/short fault detection: if the capacitor fails, the BQ294704DSGT forces immediate fault response. TI specifies CCD values from 0.1 µF to 1.0 µF for configurable timing.
What is the output drive capability of the BQ294704DSGT's OUT pin?
The BQ294704DSGT features a CMOS active-high output capable of sourcing 4.5 mA and sinking 14 mA at VDD = 14.4 V. This allows direct driving of standard NMOS gate terminals without buffering-critical for fast fuse-switching in battery protection circuits. Output voltage levels are specified as VDD – 0.3 V (high) and ≤400 mV (low), ensuring robust logic-level compatibility with common FET drivers in the BQ294704DSGT application space.
Is the BQ294704DSGT RoHS-compliant and qualified for industrial temperature range?
Yes, the BQ294704DSGT is RoHS-compliant (lead-free, NiPdAu or Sn finish) and rated for operation from –40°C to +85°C. Its MSL rating is Level-1-260C-UNLIM, supporting standard reflow profiles. While some variants (e.g., BQ294704DSGRG4) extend to +110°C, the BQ294704DSGT variant is qualified specifically for the –40°C to +85°C industrial range-confirmed in TI's Packaging Information table and Thermal Information section.
BQ294704DSGT 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)
BQ294704DSGT FAQ
1.How can I place an order for BQ294704DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294704DSGT 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 BQ294704DSGT reliable?
The price and inventory of BQ294704DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294704DSGT is usually 5 days.
3.What payment methods are accepted for BQ294704DSGT?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294704DSGT?
BQ294704DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294704DSGT 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 BQ294704DSGT?
For technical support, including BQ294704DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294704DSGT requirements.
6.How does Aetrix verify that BQ294704DSGT is sourced from the original manufacturer or authorized distributors?
All BQ294704DSGT 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 BQ294704DSGT meets industry standards.
7.What is the process for return or replacement of BQ294704DSGT?
All BQ294704DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ294704DSGT, 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 BQ294704DSGT part is unused and in its original packaging.
Return procedure for BQ294704DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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