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Texas Instruments BQ29704DSET
- Part No.:
- BQ29704DSET
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WFDFN
- Datasheet:
-
BQ29704DSET.pdf
- Description:
- IC BATT PROT LI-ION 1CELL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:220
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Product details
Overview
BQ29704DSET from Texas Instruments is a single-cell Li-ion/Li-polymer battery protection IC that provides overvoltage (4.425 V), undervoltage (2.500 V), charge/discharge overcurrent (–0.100 V / 0.125 V), and short-circuit (0.5 V) detection with factory-programmed thresholds, 8 µA typical operating current in NORMAL mode, and 6-pin WSON (1.50 mm × 1.50 mm) package for space-constrained portable power systems.
For engineers reviewing the BQ29704DSET datasheet, BQ29704DSET pinout, BQ29704DSET application, or BQ29704DSET equivalent, this page delivers verified functional specifications, validated pin roles, confirmed protection timing behavior, real-world use cases in handheld devices, and two technically documented alternative parts with explicit threshold and timing differences.
Technical Context
The BQ29704DSET implements analog voltage sensing across external FETs to detect overcurrent conditions with ±10 mV accuracy at 25°C, uses internal comparators with fixed hysteresis (100 mV for OVP/UVP) and programmable delay timers (20 ms UVP delay, 8 ms OCD/OCC delay, 250 µs SCD delay), and operates from –40°C to +85°C with BAT supply range of 1.5 V to 8 V.
It supports zero-voltage charging initiation at ≥1.7 V battery voltage and inhibition below 0.75 V, features dual gate-drive outputs (COUT for CHG FET, DOUT for DSG FET) referenced to BAT and VSS respectively, and maintains <100 nA shutdown current while retaining fault-state memory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.425 V ±10 mV @ 25°C - triggers CHG FET disable after 1.25 s delay if cell voltage exceeds safe charging limit |
| UVP Threshold | 2.500 V ±50 mV @ 25°C - disables DSG FET after 20 ms delay to prevent deep discharge damage |
| OCD Threshold | 0.125 V ±10 mV @ 25°C - detects discharge overcurrent via V––VSS differential, enabling fast DSG FET shutdown |
| OCC Threshold | –0.100 V ±10 mV @ 25°C - senses charge overcurrent using VSS–V– polarity, initiating COUT low after 8 ms |
| SCD Threshold | 0.5 V ±100 mV @ 25°C - identifies load short-circuit within 250 µs, forcing immediate DOUT low assertion |
| Operating Current | 4 µA typical @ 3.8 V BAT - enables multi-year battery runtime in always-on protection mode |
| Package | 6-pin WSON (DSE), 1.50 mm × 1.50 mm × 0.75 mm - surface-mount footprint compatible with automated PCB assembly |
Pinout & Package
Package: 6-pin WSON (DSE), body size 1.50 mm × 1.50 mm, 0.75 mm height, wettable flank terminals for optical solder inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC (Pin 1) | No Connection | Electrically open; must be left unconnected or tied to ground per layout guidelines |
| COUT (Pin 2) | Charge FET Gate Drive Output | Drives CHG FET gate high during normal operation; pulls low to disable charging on OCC/SCP/OVP faults |
| DOUT (Pin 3) | Discharge FET Gate Drive Output | Drives DSG FET gate high during normal operation; pulls low to disable discharging on UVP/OCD/SCP faults |
| VSS (Pin 4) | Ground Reference | Primary ground reference for internal comparators, overcurrent sensing, and logic circuits |
| BAT (Pin 5) | Battery Positive Supply Input | Power input from battery pack anode; supplies internal circuitry and drives COUT/DOUT high-side outputs |
| V– (Pin 6) | Negative Sense Input | Differential input for OCD, OCC, and SCD detection; connected to pack– via 2.2 kΩ resistor |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed protection thresholds | Fixed OVP=4.425 V, UVP=2.500 V, OCD=0.125 V, OCC=–0.100 V, SCD=0.5 V - eliminates external resistor networks and calibration effort |
| Dual independent FET drive outputs | COUT and DOUT provide dedicated NMOS gate control with BAT-referenced high drive - enables separate charge/discharge path management |
| Zero-voltage charging support | Enables safe recharge initiation at battery voltages ≥1.7 V and blocks charging below 0.75 V - prevents lithium plating on deeply depleted cells |
| Ultra-low quiescent current | 4 µA NORMAL mode / 100 nA shutdown - extends shelf life and standby runtime without compromising protection responsiveness |
| Integrated short-circuit protection | 250 µs detection-to-action latency with 0.5 V threshold - mitigates thermal runaway risk during direct load shorts |
Applications
| Tablet PC Battery Pack | Mobile Handset Protection |
|---|---|
Use Scenario: Integrated into slim-profile tablet battery packs requiring compact, reliable cell-level protection against overcharge, deep discharge, and accidental short circuits during field use. IC Role / Device Role / Timing Role: Primary hardware safety monitor that autonomously disables CHG/DSG FETs within milliseconds of fault detection, independent of host processor or charger IC. Use Value: Prevents thermal runaway and capacity loss by enforcing TI-validated voltage/current limits, enabling compliance with IEC 62133 and UL 2054 standards. | Use Scenario: Embedded in smartphone battery management subsystems where board space is constrained and protection must remain active during sleep modes. IC Role / Device Role / Timing Role: Standalone analog protector providing sub-100 µA standby current and deterministic 20 ms UVP response - ensures battery integrity during long idle periods. Use Value: Eliminates need for software-based monitoring, reducing firmware complexity and eliminating boot-time protection gaps. |
| Handheld Data Terminal | Portable Medical Monitor |
Use Scenario: Deployed in ruggedized industrial data collectors subjected to frequent charge/discharge cycles, mechanical shock, and variable ambient temperatures. IC Role / Device Role / Timing Role: Fault-detection engine with –40°C to +85°C operational range and ±15 mV OCD accuracy over full temperature span - maintains protection fidelity in harsh environments. Use Value: Guarantees consistent overcurrent trip points across temperature, preventing false trips or missed protections during field deployment. | Use Scenario: Used in battery-powered patient monitors requiring fail-safe operation, long shelf life, and regulatory traceability for medical-grade power systems. IC Role / Device Role / Timing Role: Hardware-enforced safety layer that remains active during device power-down, preserving fault state and enabling post-event diagnostics. Use Value: Supports ISO 13485 design controls by delivering deterministic, non-software-dependent protection behavior with documented timing margins. |
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 (vs. 4.425 V), UVP = 2.800 V (vs. 2.500 V), OCD = 0.160 V (vs. 0.125 V), tUVPD = 96 ms (vs. 20 ms) | Better suited for higher-capacity cells requiring deeper discharge tolerance and slower UVP response to avoid nuisance trips | Select BQ29702DSET when system requires higher UVP threshold and longer delay to accommodate voltage recovery after high-current discharge |
| BQ29703DSET | OVP = 4.425 V (same), UVP = 2.300 V (lower), OCD = 0.160 V (higher), tUVPD = 20 ms (same), tOCCD = 8 ms (same) | Optimized for ultra-low-voltage cutoff in energy-harvesting or backup battery applications where minimum operating voltage is critical | Choose BQ29703DSET only if application mandates 2.300 V UVP and can tolerate reduced discharge overcurrent sensitivity |
Compared with BQ29704DSET, BQ29702DSET offers higher UVP and slower response for robustness in high-drift cells, while BQ29703DSET lowers UVP for extended runtime at cost of reduced margin against cell damage - both require PCB-level validation due to differing threshold sensitivities.
Availability
BQ29704DSET is available at Aetrix Electronics and suitable for tablet PCs, mobile handsets, and handheld data terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceability for production builds.
Supply support for BQ29704DSET 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, power conversion, and signal chain solutions.
The BQ297xx family is designed specifically for cost-sensitive, space-constrained single-cell Li-ion/Li-polymer battery packs in consumer and industrial portable electronics, emphasizing minimal external components and factory-configured reliability.
FAQ
What is the overcharge protection voltage threshold for BQ29704DSET?
The BQ29704DSET has a factory-programmed overcharge detection voltage (VOVP) of 4.425 V with ±10 mV accuracy at 25°C. This threshold triggers the COUT output to go low after a fixed 1.25-second delay, disabling the charge FET to prevent cell damage. The value is laser-trimmed during manufacturing and cannot be adjusted in-circuit.
How does BQ29704DSET handle a completely depleted battery?
The BQ29704DSET supports zero-voltage charging: it allows charging to begin when the battery voltage reaches ≥1.7 V (V0CHG), and inhibits charging below 0.75 V (V0INH). This prevents lithium plating on deeply discharged cells while ensuring safe reactivation - a feature implemented entirely in hardware without MCU intervention.
What are the key timing parameters for fault response in BQ29704DSET?
BQ29704DSET uses fixed factory-programmed delays: 1.25 s for overcharge detection (tOVPD), 20 ms for over-discharge (tUVPD), 8 ms for charge/discharge overcurrent (tOCCD/tOCDD), and 250 µs for short-circuit (tSCCD). All recovery delays are also fixed: 12 ms for OVP, 8 ms for UVP/OCC/OCD, and 1 V release condition for SCD.
Can BQ29704DSET be used with external sense resistors for overcurrent detection?
No - the BQ29704DSET is designed exclusively for VDS-based overcurrent sensing across external FETs. Its V– pin measures the voltage drop between pack– and the FET source, eliminating the need for a separate sense resistor. Adding an external resistor would disrupt the calibrated 0.125 V OCD threshold and invalidate protection accuracy.
What is the operating temperature range and thermal performance of BQ29704DSET?
The BQ29704DSET operates from –40°C to +85°C ambient temperature. Its WSON package has a junction-to-ambient thermal resistance (θJA) of 190.5°C/W under standard JEDEC conditions. At 85°C ambient and 4 µA supply current, self-heating remains negligible (<0.8°C), ensuring stable threshold accuracy across the full range.
BQ29704DSET 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)
BQ29704DSET FAQ
1.How can I place an order for BQ29704DSET through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29704DSET 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 BQ29704DSET reliable?
The price and inventory of BQ29704DSET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29704DSET is usually 5 days.
3.What payment methods are accepted for BQ29704DSET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29704DSET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29704DSET?
BQ29704DSET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29704DSET 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 BQ29704DSET?
For technical support, including BQ29704DSET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29704DSET requirements.
6.How does Aetrix verify that BQ29704DSET is sourced from the original manufacturer or authorized distributors?
All BQ29704DSET 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 BQ29704DSET meets industry standards.
7.What is the process for return or replacement of BQ29704DSET?
All BQ29704DSET units undergo pre-shipment inspection (PSI). If there is an issue with BQ29704DSET, 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 BQ29704DSET part is unused and in its original packaging.
Return procedure for BQ29704DSET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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