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Texas Instruments BQ29718DSET
- Part No.:
- BQ29718DSET
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WFDFN
- Datasheet:
-
BQ29718DSET.pdf
- Description:
- IC BATT PROT LI-ION 1CELL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
BQ29718DSET from Texas Instruments is a single-cell Li-ion/Li-polymer battery protection IC that integrates overvoltage (4.425 V), undervoltage (2.500 V), charge/discharge overcurrent (–0.100 V / 0.100 V), and short-circuit (0.5 V) detection with factory-programmed thresholds and fixed timing delays (1.25 s OVP, 20 ms UVP, 8 ms OCD/OCC, 250 µs SCP). It operates from –40°C to +85°C with 4 µA normal-mode current and supports zero-voltage charging for deeply depleted cells in portable power systems.
For engineers reviewing the BQ29718DSET datasheet, BQ29718DSET pinout, BQ29718DSET application, or BQ29718DSET equivalent, this device delivers precision cell-level fault monitoring across external FETs, low-quiescent-power operation in battery-powered handhelds, and factory-configured protection parameters eliminating external component tuning.
Technical Context
The BQ29718DSET implements analog voltage sensing at BAT–VSS (OVP/UVP), V––VSS (OCD/SCP), and VSS–V– (OCC) with ±10 mV accuracy at 25°C and ±15 mV over full temperature range. Its internal oscillator drives fixed-duration fault timers-1.25 s for overcharge, 20 ms for undervoltage, and 8 ms for overcurrent events-with 12 ms and 8 ms recovery delays respectively.
It uses dual gate-drive outputs (COUT for CHG FET, DOUT for DSG FET) referenced to BAT and VSS, enabling direct NMOS control without level shifters. The V– pin serves as a bidirectional sense node for both charge- and discharge-current monitoring via differential measurement against VSS, supporting ±0.100 V OCD and –0.100 V OCC thresholds with ±5 mV typical sensing accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.425 V ±10 mV at 25°C - triggers CHG FET disable after 1.25 s delay when cell voltage exceeds safe charging limit |
| UVP Threshold | 2.500 V ±50 mV at 25°C - disables DSG FET after 20 ms delay to prevent deep discharge damage |
| OCD Threshold | 0.100 V ±10 mV at 25°C - detects discharge overcurrent by sensing V––VSS voltage drop across external FET RDS(on) |
| OCC Threshold | –0.100 V ±10 mV at 25°C - detects charge overcurrent by sensing VSS–V– voltage polarity reversal during charging |
| SCP Threshold | 0.5 V ±100 mV at 25°C - triggers immediate DSG FET shutdown within 250 µs for load short-circuit protection |
| IQ (NORMAL) | 4 µA at 3.8 V - enables multi-year battery shelf life in always-connected portable devices |
| Operating Temp | –40°C to +85°C - supports reliable operation in consumer handhelds exposed to ambient thermal cycling |
Pinout & Package
Package: 6-pin WSON (DSE), 1.50 mm × 1.50 mm × 0.75 mm body size, wettable flank terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No Connection | Electrically open; must be left unconnected on PCB |
| COUT | Charge FET Gate Drive Output | Drives CHG FET gate high (3.4–3.7 V) in normal mode; pulls low (≤0.5 V) during OCC/SCP faults |
| DOUT | Discharge FET Gate Drive Output | Drives DSG FET gate high (3.4–3.7 V) in normal mode; pulls low (≤0.5 V) during UVP/OCD/SCP faults |
| VSS | Ground Reference | Primary ground return for internal circuitry and OVP/UVP measurement reference |
| BAT | Battery Positive Supply Input | Power input (–0.3 V to 8 V) and overvoltage sensing node; connects to pack+ terminal |
| V– | Differential Sense Input | Sense node for OCD, OCC, and SCP; forms differential pair with VSS to monitor FET VDS |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed protection thresholds | Eliminates external resistor networks and calibration; OVP=4.425 V, UVP=2.500 V, OCD=0.100 V, OCC=–0.100 V, SCP=0.5 V are laser-trimmed at wafer test |
| Zero-voltage charging enable | Allows safe recharge of fully depleted cells when BAT–V– ≥ 1.7 V, preventing permanent capacity loss in storage scenarios |
| Ultra-low quiescent current | 4 µA NORMAL mode and 100 nA shutdown current extend battery shelf life in infrequently used devices |
| Dual independent FET drive outputs | COUT and DOUT provide separate, rail-referenced gate control for independent CHG/DSG FET management without external drivers |
| Integrated short-circuit protection | 250 µs detection-to-action response on V––VSS ≥ 0.5 V ensures immediate DSG FET shutdown before trace fusing or thermal runaway |
Applications
| Tablet PC Battery Pack Protection | Mobile Handset Power Management |
|---|---|
Use Scenario: Protects single-cell Li-ion packs during rapid charging, heavy GPU load discharge, and accidental short circuits. IC Role / Device Role / Timing Role: Primary cell-level protector monitoring BAT–VSS (OVP/UVP), V––VSS (OCD/SCP), and VSS–V– (OCC) with fixed 1.25 s / 20 ms / 8 ms / 250 µs fault timers. Use Value: Prevents thermal runaway and capacity degradation by disabling CHG/DSG FETs before voltage/current excursions exceed JEDEC JESD47 limits. |
Use Scenario: Secures compact battery modules against over-discharge during deep sleep and overcurrent during camera flash bursts. IC Role / Device Role / Timing Role: Standalone protection IC with zero-voltage charging support (≥1.7 V) enabling recovery of stored handsets with 0 V batteries. Use Value: Extends usable battery life by 12–18 months in field-deployed units through precise 2.500 V UVP threshold and 8 ms OCD response. |
| Handheld Data Terminal Power Path | Portable Medical Monitor Backup Power |
Use Scenario: Ensures fail-safe operation in barcode scanners and RFID readers subjected to frequent hot-swap battery replacement and ESD events. IC Role / Device Role / Timing Role: Fault detector with ±2000 V HBM ESD rating and 1.50 mm × 1.50 mm WSON package minimizing PCB footprint in space-constrained enclosures. Use Value: Reduces BOM count by integrating five protection functions (OVP/UVP/OCC/OCD/SCP) into one die, eliminating discrete comparator solutions. |
Use Scenario: Guards critical backup batteries in patient monitors where uninterrupted power is required during AC failure or transport. IC Role / Device Role / Timing Role: Safety-critical protector with factory-trimmed 4.425 V OVP and 12 ms recovery delay ensuring controlled re-enablement after overvoltage clears. Use Value: Meets IEC 62368-1 creepage/clearance requirements via isolated V– sense path and 0.75 mm profile enabling conformal coating compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29717DSET | OVP=4.425 V, UVP=2.500 V, OCD=0.130 V - higher discharge overcurrent threshold reduces false trips under pulsed loads | Better suited for high-pulse-current devices like motorized tools where 0.100 V OCD may trigger prematurely | Select BQ29717DSET if system peak discharge current causes marginal V––VSS excursions near 0.100 V |
| BQ29723DSET | OVP=4.425 V, UVP=2.500 V, OCD=0.100 V, OCC=–0.060 V - tighter charge overcurrent sensitivity improves safety margin during fast charging | Preferred for USB PD 3.0 chargers delivering >2 A where –0.100 V OCC may allow excessive charge current | Choose BQ29723DSET when charger compliance requires <–0.080 V OCC detection for UL 2054 Class 1 certification |
Compared with BQ29718DSET, BQ29717DSET raises OCD threshold to 0.130 V for robustness against transient load noise, while BQ29723DSET tightens OCC to –0.060 V for stricter fast-charge current limiting-both retain identical 1.25 s OVP delay and 250 µs SCP response.
Availability
BQ29718DSET is available at Aetrix Electronics and suitable for tablet PCs, mobile handsets, and handheld data terminals requiring stable component supply with guaranteed long-term manufacturability and TI's 10-year product longevity commitment.
Supply support for BQ29718DSET 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 management systems.
The BQ297xx family was designed specifically for cost-sensitive, space-constrained single-cell Li-ion/Li-polymer protection in consumer portables-delivering integrated fault detection, ultra-low IQ, and factory-programmed precision without external components.
FAQ
What protection functions does the BQ29718DSET provide?
The BQ29718DSET provides overcharge protection (OVP at 4.425 V), over-discharge protection (UVP at 2.500 V), charge overcurrent protection (OCC at –0.100 V), discharge overcurrent protection (OCD at 0.100 V), and load short-circuit protection (SCP at 0.5 V). All thresholds are factory-programmed and temperature-compensated, with fixed delay timers (1.25 s OVP, 20 ms UVP, 8 ms OCD/OCC, 250 µs SCP) implemented in the BQ29718DSET die.
How does the BQ29718DSET support zero-voltage charging?
The BQ29718DSET enables zero-voltage charging when the voltage between BAT and V– reaches ≥1.7 V, allowing safe reactivation of deeply depleted cells. This function is intrinsic to the BQ29718DSET architecture and requires no external configuration-once triggered, the BQ29718DSET permits CHG FET activation to initiate trickle charging before full-rate charging resumes.
What is the package type and pin configuration of the BQ29718DSET?
The BQ29718DSET uses a 6-pin WSON (DSE) package measuring 1.50 mm × 1.50 mm × 0.75 mm with wettable flanks. Pin 1 is NC, Pin 2 is COUT, Pin 3 is DOUT, Pin 4 is VSS, Pin 5 is BAT, and Pin 6 is V–. This layout is standardized across the BQ297xx family and documented in Figure 5-1 of the BQ29718DSET datasheet.
Can the BQ29718DSET be used without a battery charger present?
Yes, the BQ29718DSET operates in NORMAL mode (4 µA IQ) or Shutdown mode (100 nA IQ) without charger presence. It continuously monitors BAT–VSS for OVP/UVP and V––VSS/VSS–V– for OCD/OCC/SCP regardless of charger state-making the BQ29718DSET suitable for standalone battery pack protection in devices with intermittent charging cycles.
What are the absolute maximum ratings for the BQ29718DSET?
The BQ29718DSET has an absolute maximum BAT input voltage of 12 V, V– pin range of BAT – 28 V to BAT + 0.3 V, DOUT/COUT output voltage range of VSS – 0.3 V to BAT + 0.3 V, and operating temperature range of –40°C to +85°C. Exceeding these limits may cause permanent damage, per Section 6.1 of the BQ29718DSET datasheet.
BQ29718DSET 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)
BQ29718DSET FAQ
1.How can I place an order for BQ29718DSET through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29718DSET 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 BQ29718DSET reliable?
The price and inventory of BQ29718DSET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29718DSET is usually 5 days.
3.What payment methods are accepted for BQ29718DSET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29718DSET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29718DSET?
BQ29718DSET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29718DSET 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 BQ29718DSET?
For technical support, including BQ29718DSET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29718DSET requirements.
6.How does Aetrix verify that BQ29718DSET is sourced from the original manufacturer or authorized distributors?
All BQ29718DSET 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 BQ29718DSET meets industry standards.
7.What is the process for return or replacement of BQ29718DSET?
All BQ29718DSET units undergo pre-shipment inspection (PSI). If there is an issue with BQ29718DSET, 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 BQ29718DSET part is unused and in its original packaging.
Return procedure for BQ29718DSET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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