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Texas Instruments BQ29703DSET
- Part No.:
- BQ29703DSET
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WFDFN
- Datasheet:
-
BQ29703DSET.pdf
- Description:
- IC BATT PROT LI-ION 1CELL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:397
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Product details
Overview
BQ29703DSET from Texas Instruments is a single-cell Li-ion/Li-polymer battery protection IC that provides overvoltage (4.425 V), undervoltage (2.300 V), charge/discharge overcurrent (–0.100 V / 0.160 V), and short-circuit (0.5 V) detection with factory-programmed thresholds, ±5 mV OCP sensing accuracy, and 4 µA NORMAL-mode quiescent current for mobile handset battery packs.
For engineers reviewing the BQ29703DSET datasheet, BQ29703DSET pinout, BQ29703DSET application, or BQ29703DSET equivalent, this device delivers precise, low-power, integrated cell protection without external microcontroller intervention-critical for space-constrained portable electronics requiring robust fault coverage and zero-voltage charging capability.
Technical Context
The BQ29703DSET implements analog comparator-based fault detection with internal timing logic to trigger gate-drive outputs (COUT/DOUT) upon violation of factory-set voltage or differential-sense thresholds. It uses V–/VSS differential sensing for OCD/OCC/SCP and BAT/VSS for OVP/UVP, enabling accurate FET control without external ADCs or processors.
Its architecture supports autonomous operation: NORMAL mode draws only 4 µA while continuously monitoring; Shutdown mode reduces current to 100 nA. Fault recovery timers (e.g., 8 ms for UVP/OCD) are fixed per configuration, and zero-voltage charging initiates when BAT–V– ≥ 1.7 V-enabling safe recharge of deeply depleted cells.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.425 V ±10 mV at 25°C - triggers CHG FET disable to prevent cell damage during charging |
| UVP Threshold | 2.300 V ±50 mV at 25°C - disables DSG FET to avoid irreversible capacity loss from deep discharge |
| OCD Threshold | 0.160 V ±10 mV at 25°C - detects discharge overcurrent across external FET RDS(on) with ±5 mV typical sensing accuracy |
| OCC Threshold | –0.100 V ±10 mV at 25°C - senses reverse current through CHG FET to halt unsafe charging currents |
| Quiescent Current | 4 µA in NORMAL mode - enables multi-year battery shelf life in always-on protection applications |
| Operating Temp | –40°C to +85°C - supports full functionality across industrial-grade portable device environments |
| Package | 6-pin WSON (DSE), 1.50 mm × 1.50 mm × 0.75 mm - ultra-compact footprint for thin mobile PCBs |
Pinout & Package
Package: 6-pin WSON (DSE), 1.50 mm × 1.50 mm × 0.75 mm, wettable flank capable, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No Connection | Electrically open; must be left unconnected per design |
| COUT | Charge FET Gate Drive Output | Drives CHG FET gate high (3.4–3.7 V) in normal operation; pulls low (≤0.5 V) on OCC/SCP fault |
| DOUT | Discharge FET Gate Drive Output | Drives DSG FET gate high (3.4–3.7 V); pulls low (≤0.5 V) on UVP/OCD/SCP fault |
| VSS | Ground Reference | System ground reference for all voltage measurements and internal circuitry |
| BAT | Battery Positive Supply Input | Connects to pack+; powers internal circuitry and drives COUT/DOUT outputs |
| V– | Negative Sense Input | Differential input (vs. VSS) for OCD/OCC/SCP detection; connects to pack– via 2.2 kΩ resistor |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed protection thresholds | Fixed OVP (4.425 V), UVP (2.300 V), OCD (0.160 V), OCC (–0.100 V), SCP (0.5 V) - eliminates external component tuning and calibration effort |
| ±5 mV typical OCP sensing accuracy | Enables reliable overcurrent detection even with low-RDS(on) FETs, reducing false trips in high-current portable loads |
| Zero-voltage charging enable | Activates when BAT–V– ≥ 1.7 V - allows safe pre-charge of fully depleted Li-ion cells before standard charging resumes |
| Ultra-low quiescent current | 4 µA in NORMAL mode and 100 nA in Shutdown - extends shelf life and standby time in battery-powered devices |
| Integrated fault recovery timers | OVP recovery = 12 ms; UVP/OCD/OCC recovery = 8 ms - ensures stable re-enablement after transient faults clear |
Applications
| Mobile Handset Battery Protection | Tablet PC Pack Monitoring |
|---|---|
|
Use Scenario: Integrated protection for single-cell Li-ion battery packs in smartphones with fast-charge support and thermal constraints. IC Role / Device Role / Timing Role: Primary hardware-level protector that autonomously disables CHG/DSG FETs on OVP, UVP, OCD, OCC, or SCP events-no firmware required. Use Value: Prevents cell swelling, fire risk, or permanent capacity loss by enforcing strict voltage/current limits before system-level software intervenes. |
Use Scenario: Compact, low-power protection solution for slim tablet battery modules where board area and leakage current are critical. IC Role / Device Role / Timing Role: Standalone analog monitor providing millisecond-level fault response (e.g., 8 ms OCD delay) independent of host SoC power state. Use Value: Enables >3-month shelf life with 4 µA quiescent draw and supports zero-voltage charging to recover shipped-at-0V batteries. |
| Handheld Data Terminal Power Management | Wearable Device Cell Supervision |
|
Use Scenario: Ruggedized barcode scanners and field terminals operating across –20°C to +70°C ambient with frequent charge cycles. IC Role / Device Role / Timing Role: Fault-detection engine using V–/VSS differential sensing to reject noise and ensure reliable OCP under ESD-prone industrial conditions. Use Value: Delivers ±10 mV OVP/UVP accuracy over temperature, maintaining protection integrity without recalibration across operating range. |
Use Scenario: Ultra-small form factor wearables (e.g., smartwatches) requiring minimal PCB real estate and sub-µA sleep current. IC Role / Device Role / Timing Role: Low-footprint (1.5 mm²) supervisor that enters 100 nA Shutdown mode when pack voltage drops below UVLO threshold. Use Value: Reduces total protection solution size by eliminating discrete comparators, timers, and MOSFET drivers-cutting BOM count by ≥5 components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29702DSET | OVP = 4.350 V, UVP = 2.800 V, OCD = 0.160 V, tUVPD = 96 ms - higher UVP threshold and shorter delay than BQ29703DSET | Better suited for high-capacity Li-ion cells requiring tighter undervoltage cutoff to preserve cycle life | Select when battery chemistry demands 2.800 V UVP and faster UVP response (96 ms vs. 20 ms) |
| BQ29704DSET | OVP = 4.425 V, UVP = 2.500 V, OCD = 0.125 V, tUVPD = 20 ms - identical OVP/tUVPD but lower UVP and tighter OCD threshold | Optimized for cost-sensitive mid-tier handsets needing balanced overcharge/overdischarge margins | Choose for designs requiring 2.500 V UVP with same 20 ms delay and reduced OCD trip point (0.125 V) |
Compared with BQ29702DSET and BQ29704DSET, the BQ29703DSET offers the highest OVP (4.425 V) paired with the lowest UVP (2.300 V) in the family-making it ideal for high-voltage-tolerant, deep-discharge-capable single-cell systems where maximum energy extraction and overcharge margin are both prioritized.
Availability
BQ29703DSET is available at Aetrix Electronics and suitable for mobile handset battery protection, tablet PC pack monitoring, and handheld data terminal power management requiring stable component supply and long-term lifecycle support.
Supply support for BQ29703DSET 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and power efficiency.
The BQ297xx family is designed specifically for cost-effective, single-cell Li-ion/Li-polymer battery pack protection-integrating voltage, current, and short-circuit monitoring into a miniature WSON package with factory-programmed thresholds.
FAQ
What protection functions does the BQ29703DSET provide?
The BQ29703DSET provides overcharge protection (OVP at 4.425 V), over-discharge protection (UVP at 2.300 V), charge overcurrent protection (OCC at –0.100 V), discharge overcurrent protection (OCD at 0.160 V), and load short-circuit protection (SCP at 0.5 V). All thresholds are factory-programmed and non-adjustable. The BQ29703DSET executes these protections autonomously using internal comparators and fixed-delay timers without external firmware.
What is the quiescent current of the BQ29703DSET in NORMAL mode?
The BQ29703DSET draws 4 µA typical current in NORMAL mode at TA = 25°C and BAT = 3.8 V, enabling multi-year battery shelf life in always-connected protection circuits. In Shutdown mode, current drops to 100 nA. These values are measured per TI SLUSBU9I datasheet Section 6.5 and confirmed across –40°C to +85°C operating range.
How does the BQ29703DSET support zero-voltage charging?
The BQ29703DSET enables zero-voltage charging when the voltage between BAT and V– reaches ≥1.7 V, allowing safe pre-charge of fully depleted Li-ion cells. Charging is inhibited if BAT–VSS falls below 0.75 V. This function is implemented in hardware and requires no external control-ensuring the BQ29703DSET remains functional even when the battery voltage is near 0 V.
What package type and dimensions does the BQ29703DSET use?
The BQ29703DSET uses a 6-pin WSON package designated DSE, with nominal dimensions of 1.50 mm × 1.50 mm × 0.75 mm. It features wettable flanks for automated optical inspection and complies with JEDEC MO-229 standards. Pin layout matches TI's standardized BQ297xx footprint, enabling drop-in compatibility across the family.
Can the BQ29703DSET be used without a battery charger enabled?
Yes-the BQ29703DSET operates fully autonomously in NORMAL mode (4 µA) or Shutdown mode (100 nA) without requiring an active charger. It continuously monitors BAT–VSS for OVP/UVP and V––VSS for OCD/OCC/SCP, triggering COUT or DOUT gate-drive outputs to disable external FETs on fault detection. No host processor or charger IC is needed for basic protection functionality.
BQ29703DSET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Fault Protection:
- Over Current, Over/Under Voltage, Short Circuit
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (1.5x1.5)
BQ29703DSET FAQ
1.How can I place an order for BQ29703DSET through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29703DSET 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 BQ29703DSET reliable?
The price and inventory of BQ29703DSET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29703DSET is usually 5 days.
3.What payment methods are accepted for BQ29703DSET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29703DSET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29703DSET?
BQ29703DSET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29703DSET 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 BQ29703DSET?
For technical support, including BQ29703DSET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29703DSET requirements.
6.How does Aetrix verify that BQ29703DSET is sourced from the original manufacturer or authorized distributors?
All BQ29703DSET 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 BQ29703DSET meets industry standards.
7.What is the process for return or replacement of BQ29703DSET?
All BQ29703DSET units undergo pre-shipment inspection (PSI). If there is an issue with BQ29703DSET, 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 BQ29703DSET part is unused and in its original packaging.
Return procedure for BQ29703DSET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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