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Texas Instruments BQ29705DSER
- Part No.:
- BQ29705DSER
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 6-WFDFN
- Datasheet:
-
BQ29705DSER.pdf
- Description:
- IC BATT PROT LI-ION 1CELL 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,577
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Product details
Overview
BQ29705DSER 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 / 0.150 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 BQ29705DSER datasheet, BQ29705DSER pinout, BQ29705DSER application, or BQ29705DSER equivalent, this device delivers precise, low-power, integrated cell protection without external sense resistors-critical for space-constrained portable electronics requiring reliable fault response and zero-voltage charging capability.
Technical Context
The BQ29705DSER implements differential voltage sensing across external FETs to detect overcurrent conditions, using internal comparators with programmable delay timers (e.g., 8 ms OCD delay, 20 ms UVP delay) and fixed recovery delays (8 ms for UVP/OCC/OCD). It operates in two low-power states: NORMAL mode (4 µA ICC) and Shutdown (100 nA IQ), with all protection thresholds and timing parameters factory-programmed and non-adjustable.
Its dual gate-drive outputs-COUT (charge FET control) and DOUT (discharge FET control)-are referenced to BAT and VSS respectively, enabling direct NMOS FET control. Fault detection relies on V–/VSS differential inputs for OCD/SCP and BAT/VSS for OVP/UVP, with built-in hysteresis (100 mV OVP, 100 mV UVP) and zero-voltage charging support triggered above 1.7 V battery voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.425 V - triggers CHG FET disable when cell voltage exceeds safe charging limit |
| UVP Threshold | 2.500 V - triggers DSG FET disable to prevent deep discharge damage |
| OCD Threshold | 0.150 V - detects excessive discharge current via V––VSS differential sensing |
| OCC Threshold | –0.100 V - detects excessive charge current via VSS–V– differential sensing |
| SCD Threshold | 0.5 V - initiates immediate DSG FET shutdown within 250 µs of short-circuit event |
| Normal Mode ICC | 4 µA - enables multi-year battery shelf life in always-connected portable devices |
| Operating Temp | –40°C to +85°C - supports full functionality across industrial and consumer ambient ranges |
Pinout & Package
Package: 6-pin WSON (DSE), 1.50 mm × 1.50 mm × 0.75 mm body size, wettable flank capable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No Connection | Electrically open; must be left unconnected per datasheet |
| COUT | Charge FET Gate Drive Output | Drives CHG FET gate high (3.4–3.7 V) in normal operation; 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); pulls low (<0.5 V) during UVP/OCD/SCP faults |
| VSS | Ground Reference | Primary ground reference for voltage measurements and internal circuitry |
| BAT | Battery Positive Supply Input | Power input (–0.3 V to 8 V) and reference for OVP/UVP detection |
| V– | Negative Sense Input | Differential input for OCD, OCC, SCP detection; connected to pack– via 2.2 kΩ resistor |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Protection | All thresholds (OVP/UVP/OCD/OCC/SCD) and timers (delays/recovery) are laser-trimmed and fixed at manufacture-no external configuration required |
| ±5 mV OCD Sensing Accuracy | Enables precise high-current detection without external sense resistor, reducing BOM count and PCB area |
| Zero-Voltage Charging Support | Allows safe reactivation of deeply depleted cells (down to 0 V) when charger voltage ≥1.7 V, improving field reliability |
| Ultra-Low Power Modes | 4 µA NORMAL mode and 100 nA Shutdown mode extend battery shelf life and reduce standby drain |
| Dual Independent FET Control | Separate COUT and DOUT outputs enable independent charge/discharge path management and fast fault isolation |
Applications
| Mobile Handsets | Tablet PCs |
|---|---|
Use Scenario: Primary battery protection in slim smartphones with single-cell Li-ion packs and tight thermal constraints. IC Role / Device Role / Timing Role: Monitors cell voltage and FET VDS in real time; disables CHG/DSG FETs within 250 µs (SCP) or 8 ms (OCD) to prevent thermal runaway. Use Value: Eliminates need for discrete protection MOSFETs and sense resistors, saving >1.2 mm² PCB area and simplifying layout. | Use Scenario: Battery safety management in 7–10 inch tablets where runtime and cycle life depend on precise over-discharge prevention. IC Role / Device Role / Timing Role: Enforces 2.500 V UVP threshold with 20 ms delay and 8 ms recovery to avoid premature shutdown during transient load dips. Use Value: Prevents irreversible capacity loss by blocking discharge below safe cutoff while tolerating brief voltage sags under peak CPU/GPU loads. |
| Handheld Data Terminals | Wearable Medical Sensors |
Use Scenario: Ruggedized barcode scanners and RFID readers operating in warehouses with frequent hot-swap battery usage. IC Role / Device Role / Timing Role: Detects short-circuit events at 0.5 V threshold with 250 µs response, then holds DSG FET off until pack voltage recovers >1 V. Use Value: Survives repeated accidental shorts during battery insertion/removal without latch-up or damage. | Use Scenario: Long-life wearable monitors powered by coin-cell–sized Li-polymer batteries requiring multi-year shelf life. IC Role / Device Role / Timing Role: Delivers 100 nA shutdown current and 4 µA NORMAL-mode draw to minimize self-discharge during storage or sleep. Use Value: Extends unused battery shelf life beyond 36 months while retaining zero-voltage charging readiness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ29704DSER | Identical package and pinout; differs only in UVP threshold (2.500 V vs. BQ29705's 2.500 V) and OCD threshold (0.125 V vs. 0.150 V) | Suitable for designs requiring slightly more aggressive discharge overcurrent trip point | Select BQ29704DSER if lower OCD threshold improves margin against false trips under high-temp battery impedance rise |
| BQ29717DSER | Same family, same 6-pin WSON; OCD threshold = 0.130 V, OCC = –0.100 V, SCD = 0.5 V - identical to BQ29705DSER except UVP = 2.500 V and tUVPD = 20 ms | Drop-in compatible for systems needing identical timing but different factory trim options | Choose BQ29717DSER only if alternate factory programming (e.g., different OVP hysteresis or timer variants) is required for qualification |
Compared with BQ29704DSER and BQ29717DSER, the BQ29705DSER offers a balanced combination of 0.150 V OCD sensitivity and 20 ms UVP delay-optimized for handhelds where moderate overcurrent tolerance and fast undervoltage response prevent brownouts during burst transmission.
Availability
BQ29705DSER is available at Aetrix Electronics and suitable for mobile handsets, tablet PCs, and handheld data terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for BQ29705DSER 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 for industrial, automotive, and personal electronics markets.
The BQ297xx family is designed specifically for cost-sensitive, space-constrained single-cell Li-ion/Li-polymer battery packs-emphasizing ultra-low power, factory-programmed precision, and minimal external components.
FAQ
What protection functions does the BQ29705DSER provide?
The BQ29705DSER 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 0.150 V), and load short-circuit protection (SCD at 0.5 V). All thresholds and associated delay timers are factory-programmed and non-adjustable. The BQ29705DSER executes these protections using differential sensing across external FETs and delivers gate-drive signals via dedicated COUT and DOUT pins.
What is the operating current consumption of the BQ29705DSER in NORMAL mode?
The BQ29705DSER draws 4 µA typical current in NORMAL mode at TA = 25°C and BAT = 3.8 V, with a maximum of 5.5 µA across temperature and voltage range. This ultra-low quiescent current enables multi-year battery shelf life in portable devices. In Shutdown mode, it consumes only 100 nA, making the BQ29705DSER suitable for applications requiring extended storage without battery degradation.
How does the BQ29705DSER support zero-voltage charging?
The BQ29705DSER enables zero-voltage charging when the battery voltage is 0 V by allowing the CHG FET to turn on if the charger voltage applied to the BAT pin exceeds 1.7 V. This feature permits safe reactivation of deeply depleted cells before normal operation resumes. The BQ29705DSER also includes an inhibit threshold at 0.75 V to prevent unsafe charging attempts below minimum cell viability. Both thresholds are factory-programmed and fixed.
What package type and dimensions does the BQ29705DSER use?
The BQ29705DSER uses a 6-pin WSON package (also labeled DSE), with nominal body dimensions of 1.50 mm × 1.50 mm × 0.75 mm. It features wettable flanks for automated optical inspection (AOI) and is RoHS-compliant. Pin 1 is NC (no connection), and the package is optimized for high-density portable PCB layouts where footprint and thermal performance are critical-consistent with the BQ29705DSER's target applications in mobile handsets and tablets.
Can the BQ29705DSER be used with lithium iron phosphate (LiFePO₄) cells?
No-the BQ29705DSER is specifically designed and factory-programmed for single-cell Li-ion and Li-polymer batteries, with OVP (4.425 V) and UVP (2.500 V) thresholds incompatible with LiFePO₄'s typical 3.6 V max and 2.0 V min. Using the BQ29705DSER with LiFePO₄ would result in premature overcharge cutoff or failure to protect against deep discharge. For LiFePO₄, Texas Instruments recommends the BQ29718 or BQ29723, which offer lower OVP/UVP settings aligned to that chemistry.
BQ29705DSER 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)
BQ29705DSER FAQ
1.How can I place an order for BQ29705DSER through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ29705DSER 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 BQ29705DSER reliable?
The price and inventory of BQ29705DSER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ29705DSER is usually 5 days.
3.What payment methods are accepted for BQ29705DSER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ29705DSER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ29705DSER?
BQ29705DSER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ29705DSER 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 BQ29705DSER?
For technical support, including BQ29705DSER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ29705DSER requirements.
6.How does Aetrix verify that BQ29705DSER is sourced from the original manufacturer or authorized distributors?
All BQ29705DSER 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 BQ29705DSER meets industry standards.
7.What is the process for return or replacement of BQ29705DSER?
All BQ29705DSER units undergo pre-shipment inspection (PSI). If there is an issue with BQ29705DSER, 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 BQ29705DSER part is unused and in its original packaging.
Return procedure for BQ29705DSER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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