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Texas Instruments BQ294702DSGR
- Part No.:
- BQ294702DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ294702DSGR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,153
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Product details
Overview
BQ294702DSGR from Texas Instruments is a dedicated 2- to 4-series Li-ion battery overvoltage protection IC with factory-programmed 4.300 V OVP threshold, ±10 mV accuracy at 25°C, external capacitor-programmed delay (1–2 s with 0.1 µF), and CMOS active-high output drive. It operates across –40°C to +85°C and supports notebook and UPS battery pack safety systems.
For engineers reviewing the BQ294702DSGR datasheet, BQ294702DSGR pinout, BQ294702DSGR application, or BQ294702DSGR equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, leakage and supply current specs, and validated alternative options for second-level cell voltage monitoring in production battery management designs.
Technical Context
The BQ294702DSGR implements independent per-cell voltage sensing across four differential inputs (V1–VSS to V4–V3), triggering an external capacitor-based delay timer upon any cell exceeding 4.300 V. Its internal comparator architecture includes 300 mV hysteresis and fault detection for open/shorted CD capacitors.
In overvoltage mode, the device drives OUT high after tCD delay (1–2 s typical), enabling direct NMOS FET control to short a fuse and interrupt power. In normal mode, it draws only 1 µA supply current with <100 nA per-cell input leakage, supporting ultra-low-power battery pack standby operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.300 V ±10 mV at 25°C - precise trip point for 4.3 V nominal Li-ion cell overvoltage shutdown |
| OV Hysteresis | 300 mV - prevents chatter during voltage recovery near threshold |
| Delay Timer Range | 1–2 s with 0.1 µF CD capacitor - configurable response time for safe fuse blow coordination |
| Supply Current | ≈1 µA at VCELL(ALL) < VPROTECT - enables multi-year shelf life in battery packs |
| Input Leakage | <100 nA per cell input - minimizes self-discharge impact on stacked cells |
| Operating Temp | –40°C to +85°C - qualified for consumer and industrial portable equipment environments |
| Output Type | CMOS Active High - directly drives NMOS gate without external pull-up |
Pinout & Package
8-pin WSON (DSG) package, 2.00 mm × 2.00 mm footprint, exposed thermal pad connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated 3–20 V supply rail; requires RC filter for noise immunity |
| V4 | Cell voltage sense input | Sense node for positive terminal of top (4th) cell in stack |
| V3 | Cell voltage sense input | Sense node for positive terminal of 3rd cell from bottom |
| V2 | Cell voltage sense input | Sense node for positive terminal of 2nd cell from bottom |
| V1 | Cell voltage sense input | Sense node for positive terminal of lowest (1st) cell |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; connects to thermal pad |
| CD | Delay capacitor interface | Analog node charging/discharging external capacitor to set OV response time; detects open/short faults |
| OUT | Fault signal output | CMOS Active High output; drives NMOS gate to activate fuse-blow path during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed OVP threshold | 4.300 V with ±10 mV accuracy ensures consistent trip point without calibration |
| External delay capacitor programming | 1–2 s delay with 0.1 µF CCD enables precise coordination with fuse thermal response |
| CD pin fault detection | Detects open or shorted delay capacitor and forces immediate OUT activation - eliminates single-point failure risk |
| Ultra-low quiescent current | 1 µA supply draw extends battery shelf life and reduces standby power loss |
| Per-cell independent monitoring | Four analog inputs enable true 2S–4S scalability without external multiplexing or reconfiguration |
Applications
| High-Voltage Notebook Battery Packs | UPS Backup Battery Modules |
|---|---|
Use Scenario: Protects 3S or 4S Li-ion stacks in thin-and-light notebooks against charger overvoltage or cell imbalance. IC Role / Device Role / Timing Role: Second-level protector that triggers NMOS switch to blow fuse only after confirmed overvoltage persists ≥1 s. Use Value: Prevents thermal runaway while avoiding nuisance trips from transient spikes due to 300 mV hysteresis and programmable delay. |
Use Scenario: Secures sealed lead-acid or Li-ion backup batteries in enterprise UPS systems during AC-to-DC conversion surges. IC Role / Device Role / Timing Role: Monitors individual cell voltages in series strings and asserts fault signal to disable charging path before damage occurs. Use Value: Enables fail-safe shutdown with <100 nA per-cell leakage, preserving charge integrity during long standby periods. |
| Industrial Portable Test Equipment | Medical Portable Power Packs |
Use Scenario: Safeguards rechargeable 4S Li-ion packs powering handheld oscilloscopes and multimeters used in field service. IC Role / Device Role / Timing Role: Independent cell monitoring ensures no single weak cell causes overvoltage in adjacent cells during fast charging. Use Value: ±10 mV OVP accuracy maintains tight voltage margins required for Class I medical-grade battery certification. |
Use Scenario: Provides redundant overvoltage protection in battery modules for portable infusion pumps and ventilators. IC Role / Device Role / Timing Role: Acts as hardware-enforced safety layer that cuts power before cell voltage exceeds 4.300 V, independent of MCU firmware. Use Value: Meets IEC 62368-1 requirement for dual protection by delivering deterministic response without software dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ294704DSGR | OVP threshold = 4.400 V; otherwise identical electrical and pinout specification | Used where higher cell voltage tolerance (e.g., 4.4 V LiCoO₂ chemistry) is required | Select when system design targets 4.4 V max cell voltage instead of 4.3 V |
| BQ294701DSGR | OVP threshold = 4.250 V; same package, timing, and leakage performance | Preferred for conservative protection of aging or high-impedance Li-ion cells prone to voltage creep | Choose for enhanced margin in high-temperature or long-life deployments |
Compared with BQ294702DSGR, BQ294704DSGR raises OVP by 100 mV for higher-voltage chemistries, while BQ294701DSGR lowers it by 50 mV for tighter safety margins-both retain identical delay behavior, leakage, and 8-pin WSON compatibility.
Availability
BQ294702DSGR is available at Aetrix Electronics and suitable for notebook battery packs, UPS backup modules, and portable medical power systems requiring stable component supply with full traceability and lifecycle support.
Supply support for BQ294702DSGR 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 precision analog ICs.
The BQ2947 family is designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, targeting high-reliability portable and industrial energy storage applications.
FAQ
What is the exact overvoltage protection threshold of the BQ294702DSGR?
The BQ294702DSGR has a factory-programmed overvoltage protection threshold of 4.300 V, specified with ±10 mV accuracy at 25°C and ±54 mV maximum drift over –40°C to +110°C. This value is fixed per device variant and cannot be adjusted externally. The BQ294702DSGR's threshold is confirmed in TI's SLUSB15K datasheet Table 4 and Section 6.5 Electrical Characteristics.
Does the BQ294702DSGR support 2-cell, 3-cell, and 4-cell Li-ion configurations?
Yes, the BQ294702DSGR supports 2S, 3S, and 4S Li-ion battery configurations. Unused sense pins (e.g., V4 for 2S or V3/V4 for 3S) must be shorted to the adjacent lower-potential pin as shown in Figures 8-2 and 8-3 of the datasheet. All configurations retain the same 4.300 V OVP threshold and delay timing behavior.
How does the CD pin function in the BQ294702DSGR, and what capacitor value is recommended?
The CD pin on the BQ294702DSGR connects to an external capacitor that sets the overvoltage delay timer. With a 0.1 µF capacitor, the delay is 1–2 seconds. The device also monitors CD for open or short faults and forces immediate OUT activation if detected. TI recommends 0.1 µF ±10% X7R ceramic for stable timing and robust fault coverage.
What is the output drive capability of the BQ294702DSGR's OUT pin?
The BQ294702DSGR features a CMOS Active High output capable of sourcing 4.5 mA at VDD = 14.4 V and sinking up to 14 mA when pulled low via external resistor. It directly drives NMOS gates without external level-shifting and maintains logic-high output within 0.3 V of VDD under load - verified in Section 6.5 Electrical Characteristics of the datasheet.
Is the BQ294702DSGR RoHS-compliant and qualified for industrial temperature range?
Yes, the BQ294702DSGR is RoHS-compliant (lead-free, NiPdAu finish) and rated for –40°C to +85°C operating ambient temperature. Its MSL Level-1 rating supports standard reflow assembly, and thermal metrics (RθJA = 62°C/W) confirm suitability for compact PCB layouts in space-constrained battery modules.
BQ294702DSGR 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)
BQ294702DSGR FAQ
1.How can I place an order for BQ294702DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294702DSGR 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 BQ294702DSGR reliable?
The price and inventory of BQ294702DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294702DSGR is usually 5 days.
3.What payment methods are accepted for BQ294702DSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294702DSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294702DSGR?
BQ294702DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294702DSGR 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 BQ294702DSGR?
For technical support, including BQ294702DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294702DSGR requirements.
6.How does Aetrix verify that BQ294702DSGR is sourced from the original manufacturer or authorized distributors?
All BQ294702DSGR 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 BQ294702DSGR meets industry standards.
7.What is the process for return or replacement of BQ294702DSGR?
All BQ294702DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ294702DSGR, 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 BQ294702DSGR part is unused and in its original packaging.
Return procedure for BQ294702DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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