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Texas Instruments BQ294703DSGR
- Part No.:
- BQ294703DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ294703DSGR.pdf
- Description:
- IC BATT PROT LI-ION 2-4CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:5,799
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Product details
Overview
BQ294703DSGR from Texas Instruments is a precision overvoltage protection IC for 2- to 4-series Li-ion battery packs, featuring factory-programmed 4.325 V OVP threshold, ±10 mV accuracy at 25°C, external capacitor-programmed delay (1–2 s with 0.1 µF), and active-high CMOS output. It operates across –40°C to +85°C and supports notebook and UPS battery backup systems.
For engineers reviewing the BQ294703DSGR datasheet, BQ294703DSGR pinout, BQ294703DSGR application, or BQ294703DSGR equivalent, this page delivers verified technical context, real-world timing behavior, cell-level sensing architecture, thermal performance data, and validated alternative options for second-level battery pack protection design.
Technical Context
The BQ294703DSGR implements independent analog voltage monitoring per cell (V1–VSS through V4–V3) with fixed 300 mV hysteresis and internal reference trimming. Its delay timer uses an external CD pin capacitor (0.1 µF typical) charged then linearly discharged to trigger OUT after precise 1–2 s fault persistence.
In overvoltage mode, the device drives OUT high (CMOS) to activate an external NMOS fuse-switching FET; in normal mode, it draws only 1 µA supply current while maintaining <100 nA per-cell input leakage. The WSON-8 package integrates thermal pad grounding for reliable operation up to 85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.325 V ±10 mV at 25°C - sets precise cell overvoltage trip point for 4S Li-ion stacks |
| OV Hysteresis | 300 mV - prevents chatter during voltage recovery near threshold |
| Delay Timer Range | 1–2 s with 0.1 µF CD capacitor - configurable fault persistence window before action |
| Supply Current | ≈1 µA below VPROTECT - enables ultra-low-power always-on monitoring |
| Input Leakage | <100 nA per cell input - minimizes self-discharge impact on battery pack |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade portable power systems |
| Output Type | CMOS Active High - directly drives NMOS gate without pull-up resistor |
Pinout & Package
Package: 8-pin WSON (DSG), 2.00 mm × 2.00 mm, exposed thermal pad (PowerPAD™) requiring PCB connection to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated 3–20 V input; requires RC filter for noise immunity |
| V4 | Cell voltage sense input | Senses positive terminal of top (4th) cell in stack; connects to PACK+ |
| V3 | Cell voltage sense input | Senses positive terminal of 3rd cell; differential input referenced to V2 |
| V2 | Cell voltage sense input | Senses positive terminal of 2nd cell; differential input referenced to V1 |
| V1 | Cell voltage sense input | Senses positive terminal of lowest cell; differential input referenced to VSS |
| VSS | Ground reference | IC ground and negative terminal of lowest cell; must connect to PowerPAD™ |
| CD | Delay capacitor interface | Connects external timing capacitor; includes open/short fault detection logic |
| OUT | Fault signal output | CMOS Active High - drives high to enable external NMOS fuse switch |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed OVP threshold | 4.325 V with ±10 mV accuracy - eliminates external calibration components |
| External delay capacitor interface | CD pin supports 0.1–1.0 µF timing capacitors - enables field-adjustable fault response time |
| Open/short CD capacitor detection | Triggers OUT even if CD capacitor fails open or shorted - ensures fail-safe protection |
| 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 balance and extends shelf life in standby |
Applications
| Notebook Battery Packs | UPS Battery Backup Systems |
|---|---|
Use Scenario: Monitors individual cells in 3S or 4S Li-ion packs during charging and system operation to prevent overvoltage-induced thermal runaway. IC Role / Device Role / Timing Role: Second-level protector that triggers after primary charger cutoff failure; delays action 1–2 s to avoid false trips from transient spikes. Use Value: Enables safe use of high-energy-density NMC cells by enforcing strict 4.325 V/cell limit with ±10 mV accuracy and robust noise immunity. |
Use Scenario: Protects sealed lead-acid or Li-ion backup batteries in enterprise UPS units during extended grid-out events with infrequent but critical overvoltage exposure. IC Role / Device Role / Timing Role: Standby-mode OVP supervisor with 1 µA quiescent current; activates NMOS fuse switch only upon confirmed sustained overvoltage. Use Value: Extends battery service life by eliminating parasitic drain while guaranteeing fail-safe shutdown within 2 seconds of persistent overvoltage. |
| Medical Portable Devices | Industrial Handheld Scanners |
Use Scenario: Secures rechargeable Li-ion packs in battery-powered ECG monitors and infusion pumps where safety certification mandates redundant overvoltage protection. IC Role / Device Role / Timing Role: Independent cell-level monitor operating outside main MCU control loop; provides hardware-enforced OVP with no software dependency. Use Value: Meets IEC 62368-1 and UL 2054 requirements via deterministic analog timing and ±10 mV threshold accuracy across –40°C to +85°C. |
Use Scenario: Integrates into compact barcode scanner battery modules where space-constrained 2S or 3S configurations require minimal footprint protection. IC Role / Device Role / Timing Role: Compact WSON-8 solution with 2 mm × 2 mm footprint - replaces discrete comparator+timer designs with single-chip reliability. Use Value: Reduces BOM count by 4+ components while improving timing consistency versus RC-based discrete solutions. |
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 (vs. 4.325 V); same hysteresis, timing, and output drive | Used where higher cell voltage tolerance is required (e.g., LCO chemistry or elevated temperature operation) | Select when nominal cell voltage exceeds 4.325 V but remains ≤4.400 V under full charge and thermal stress |
| BQ294702DSGR | OVP threshold = 4.300 V (vs. 4.325 V); identical package, pinout, and electrical specs otherwise | Preferred for tighter-margin NMC/NCA cells needing earlier intervention before gas generation onset | Choose for conservative protection targeting 4.300 V trip with same 300 mV hysteresis and 1–2 s delay behavior |
Compared with BQ294704DSGR and BQ294702DSGR, the BQ294703DSGR provides the optimal 4.325 V threshold for standard 4.2 V/cell Li-ion systems operating near upper specification limits, balancing safety margin against usable capacity without requiring layout or firmware changes.
Availability
BQ294703DSGR is available at Aetrix Electronics and suitable for notebook battery management, UPS backup systems, and medical portable devices requiring stable component supply with guaranteed long-term manufacturability.
Supply support for BQ294703DSGR 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 battery protection and power system ICs.
The BQ2947 family was designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, emphasizing precision threshold accuracy, low-power operation, and fail-safe timing architecture for safety-critical portable power applications.
FAQ
What is the exact overvoltage protection threshold of the BQ294703DSGR?
The BQ294703DSGR 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 remains stable across –40°C to +85°C with specified drift limits (±54 mV at 110°C). The BQ294703DSGR does not support user adjustment of this threshold.
How does the external delay capacitor affect BQ294703DSGR timing behavior?
The BQ294703DSGR uses the CD pin to connect an external capacitor (typically 0.1 µF) that sets the overvoltage delay time between 1 s and 2 s. The internal circuit charges then discharges this capacitor; when voltage falls below threshold, OUT goes high. The BQ294703DSGR also detects CD pin open/short faults to ensure fail-safe triggering regardless of capacitor integrity.
Is the BQ294703DSGR compatible with 2-cell, 3-cell, and 4-cell Li-ion battery configurations?
Yes, the BQ294703DSGR supports 2S, 3S, and 4S Li-ion configurations. Unused Vx pins (e.g., V4 for 2S) must be shorted to the adjacent lower-sense pin per TI's application guidance. All configurations retain the same 4.325 V per-cell OVP threshold, hysteresis, and delay timing behavior of the BQ294703DSGR.
What is the recommended output configuration for driving an external MOSFET with the BQ294703DSGR?
The BQ294703DSGR features CMOS Active High output, enabling direct connection to the gate of an NMOS FET without external pull-up. When overvoltage is detected, the BQ294703DSGR drives OUT high (up to VDD – 0.3 V) with 4.5 mA source capability, sufficient to rapidly turn on common low-Rds(on) NMOS devices used in fuse-switching circuits.
Does the BQ294703DSGR include any built-in test features for production validation?
Yes, the BQ294703DSGR supports Customer Test Mode: shorting the CD pin to VSS reduces overvoltage delay to ≤170 ms, accelerating functional verification during manufacturing. This mode retains full accuracy and fault-detection capability of the BQ294703DSGR while cutting test time versus standard 1–2 s delay verification.
BQ294703DSGR 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)
BQ294703DSGR FAQ
1.How can I place an order for BQ294703DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ294703DSGR 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 BQ294703DSGR reliable?
The price and inventory of BQ294703DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ294703DSGR is usually 5 days.
3.What payment methods are accepted for BQ294703DSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ294703DSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ294703DSGR?
BQ294703DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ294703DSGR 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 BQ294703DSGR?
For technical support, including BQ294703DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ294703DSGR requirements.
6.How does Aetrix verify that BQ294703DSGR is sourced from the original manufacturer or authorized distributors?
All BQ294703DSGR 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 BQ294703DSGR meets industry standards.
7.What is the process for return or replacement of BQ294703DSGR?
All BQ294703DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ294703DSGR, 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 BQ294703DSGR part is unused and in its original packaging.
Return procedure for BQ294703DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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