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Texas Instruments BQ24311DSGR
- Part No.:
- BQ24311DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ24311DSGR.pdf
- Description:
- IC BATT PROTECTION LI-ION 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BQ24311DSGR from Texas Instruments is a Li-ion battery front-end protection IC that monitors input overvoltage (OVP), user-programmable input overcurrent (OCP), and battery overvoltage (BOVP) in portable charging systems. It integrates a 30 V-rated internal pass FET, supports up to 300 mA input current, responds to OVP in <1 μs, and provides open-drain FAULT signaling for mobile phones and Bluetooth headsets.
For engineers reviewing the BQ24311DSGR datasheet, BQ24311DSGR pinout, BQ24311DSGR application, or BQ24311DSGR equivalent, this page delivers verified functional roles, thermal shutdown behavior, ILIM resistor programming range, precise OVP/BOVP thresholds, and fault recovery timing critical for safe Li-ion charger front-end design.
Technical Context
The BQ24311DSGR implements independent analog comparators with deglitch timers for three simultaneous protections: input overvoltage (5.85 V threshold, 60 mV hysteresis), battery overvoltage (4.35 V threshold, 275 mV hysteresis), and programmable input overcurrent (50–300 mA via ILIM resistor). Each fault triggers an open-drain FAULT pin low and disables the internal N-channel pass FET.
It features a soft-start circuit to limit inrush current during power-on, a blanking period (176 μs) before OCP latching, and thermal shutdown at 145 °C with 20 °C hysteresis. The CE pin enables host-controlled disablement, resetting internal fault counters and placing FAULT in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input OVP Threshold | 5.85 V typical; disables pass FET within 1 μs if VIN exceeds this value, preventing downstream damage from adapter surges. |
| Battery OVP Threshold | 4.35 V typical; disconnects charging path when pack voltage exceeds safe Li-ion upper limit, avoiding cell stress. |
| Input Current Limit Range | 50–300 mA; set by external ILIM resistor (83.3–500 kΩ); enables precise current tailoring for diverse USB-powered devices. |
| Max Input Voltage Rating | 30 V absolute maximum; allows robust operation with wide-input adapters while maintaining internal safety margins. |
| Thermal Shutdown | 145 °C junction temperature; shuts down FET and asserts FAULT until die cools by 20 °C, protecting against PCB layout or ambient overheating. |
| Dropout Voltage | 35 mV typical at 125 mA; minimizes conduction loss and heat generation in the integrated pass FET under full load. |
| Operating Junction Temp | –40 °C to +125 °C; supports reliable function across industrial and consumer handheld operating environments. |
Pinout & Package
Package: WSON-8 (DSG), 2.00 mm × 2.00 mm, exposed thermal pad connected internally to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input power supply connection | Accepts DC adapter input (3–26 V); requires ≥1 μF ceramic bypass capacitor to ground for OVP transient suppression. |
| OUT | Protected output to charging system | Delivers regulated input power to downstream charger IC; requires ≥1 μF ceramic capacitor to ground for reverse-current stability. |
| VBAT | Battery voltage sense input | Monitors pack voltage via external resistor divider; enables BOVP detection; must not be directly tied to battery without RBAT ≥100 kΩ for failure-mode safety. |
| ILIM | Overcurrent threshold programming | Connects to VSS via resistor (83.3–500 kΩ) to set IOCP = 25 mA / RILIM(kΩ); determines trip point for input current limiting. |
| CE | Chip enable control | Active-low logic input; pulls down internally; disables FET and FAULT output when high, resetting OCP/BOVP fault counters. |
| FAULT | Fault status indicator | Open-drain output driven low during OVP, OCP, BOVP, or thermal shutdown; requires external pull-up for host microcontroller monitoring. |
| VSS | Ground reference | Primary ground return; thermal pad must be soldered to PCB ground plane via multiple vias for thermal performance and EMI control. |
| NC | No-connect terminal | Internally unused; must remain unconnected in layout to avoid parasitic coupling or test-mode activation. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid input OVP response | <1 μs propagation delay ensures immediate disconnection before surge energy reaches sensitive downstream charger ICs. |
| User-programmable OCP | Resistor-based threshold setting (50–300 mA) allows precise matching to USB port current limits and system-level power budgets. |
| Dual-directional pass FET | Supports reverse current flow (OUT→IN) when VOUT > VUVLO + 0.7 V, enabling accessory power delivery without external diodes. |
| Integrated thermal protection | Die temperature monitoring with 145 °C shutdown and 20 °C hysteresis prevents latch-up and ensures automatic recovery after cooling. |
| Soft-start and soft-stop | Controls FET gate slew rate during power-on and fault conditions to minimize input ringing and output voltage overshoot. |
Applications
| Mobile Phone Charging Protection | Bluetooth Headset Power Management |
|---|---|
Use Scenario: USB-powered smartphone with integrated Li-ion battery and external wall adapter. IC Role / Device Role / Timing Role: Front-end protector placed between adapter and main charger IC (e.g., BQ24080), continuously monitoring IN, OUT, and VBAT nodes. Use Value: Prevents catastrophic failure from adapter OVP events (e.g., 12 V misconnection) and blocks overcurrent before it damages the PMIC or battery. | Use Scenario: Compact Bluetooth headset with micro-USB charging port and single-cell Li-ion battery. IC Role / Device Role / Timing Role: Standalone protection element ensuring safe charge path integrity in space-constrained wearable form factor. Use Value: Enables use of cost-effective non-regulated adapters while guaranteeing BOVP cutoff at 4.35 V to extend cycle life and prevent thermal runaway. |
| MP3 Player Battery Safety | Low-Power Handheld Diagnostic Tool |
Use Scenario: Portable media player with replaceable Li-ion pack and dual-input capability (USB + AC adapter). IC Role / Device Role / Timing Role: Dual-role protector handling both forward charging and reverse accessory power delivery via same connector. Use Value: Supports OUT→IN reverse current up to 300 mA for powering accessories (e.g., earphones), eliminating need for separate power-path switches. | Use Scenario: Industrial handheld tester requiring long-term reliability and immunity to field adapter variations. IC Role / Device Role / Timing Role: Primary overvoltage and overtemperature guard for embedded battery management subsystem. Use Value: Provides fail-safe shutdown on die temperature >145 °C-critical for sealed enclosures where airflow is restricted and thermal accumulation occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion front-end protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24312DSGR | Same package and pinout; higher OVP threshold (6.2 V typical) and wider OCP range (100–600 mA). | Suitable for systems using 6 V nominal adapters or requiring higher current delivery to fast-charging modules. | Select BQ24312DSGR only if 6.2 V OVP margin is required and system can tolerate higher minimum input voltage for UVLO. |
| TPS259211DSGR | Programmable overvoltage clamp (not disconnect), no BOVP sensing, supports 4.5 A continuous current. | Designed for general-purpose load switching-not optimized for Li-ion battery voltage monitoring or BOVP protection. | Choose TPS259211DSGR only when overvoltage clamping (not disconnection) and high-current delivery are primary requirements, and BOVP is handled elsewhere. |
Compared with BQ24311DSGR, the BQ24312DSGR offers higher OVP tolerance but reduced precision at low OCP settings, while the TPS259211DSGR lacks battery voltage monitoring entirely-making it unsuitable for standalone Li-ion protection where BOVP is mandatory.
Availability
BQ24311DSGR is available at Aetrix Electronics and suitable for mobile phones, Bluetooth headsets, and MP3 players requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for BQ24311DSGR 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 and embedded processing technologies, with decades of expertise in battery management and power protection solutions.
The BQ24311DSGR belongs to TI's battery front-end protection IC product line, engineered specifically to safeguard Li-ion cells from charging circuit faults-including adapter overvoltage, cable overcurrent, and pack overvoltage-in compact portable electronics.
FAQ
What is the exact input overvoltage protection threshold for BQ24311DSGR?
The BQ24311DSGR has a typical input overvoltage protection (OVP) threshold of 5.85 V, with a min/max range of 5.71 V to 6.00 V across temperature and process variation. This threshold is fixed and not adjustable; exceeding it causes the internal pass FET to turn off within 1 μs, and the FAULT pin goes low. The BQ24311DSGR datasheet specifies 5.85 V as the design center value used for system validation.
How do I set the input overcurrent limit for BQ24311DSGR?
The input overcurrent limit for BQ24311DSGR is set using an external resistor (RILIM) connected between the ILIM pin and VSS. The relationship is approximated by IOCP = 25 mA / RILIM(kΩ), supporting a range of 50–300 mA. For example, a 200 kΩ resistor sets IOCP ≈ 125 mA. The BQ24311DSGR datasheet Figure 4 and Equation 1 confirm this linear programming method.
Does BQ24311DSGR provide battery overvoltage protection, and what is its threshold?
Yes, the BQ24311DSGR provides dedicated battery overvoltage protection (BOVP) with a typical threshold of 4.35 V and a tolerance of ±50 mV. It monitors the VBAT pin continuously and disables the pass FET if the sensed battery voltage exceeds this level. The BQ24311DSGR also includes 275 mV hysteresis to prevent chatter during recovery, and the BOVP function remains active even when CE is high.
Can BQ24311DSGR support reverse current flow from OUT to IN?
Yes, the BQ24311DSGR supports controlled reverse current flow (OUT → IN) when VOUT > VUVLO + 0.7 V, enabling accessory power delivery through the same port. In this mode, the internal FET conducts bidirectionally with the same 300 mA forward rating-but no overcurrent protection is active in reverse direction. This behavior is documented in the BQ24311DSGR datasheet Section 9.1.2.1 and Figure 13.
What thermal protection features does BQ24311DSGR include?
The BQ24311DSGR includes junction temperature monitoring with thermal shutdown activation at 145 °C (typical) and 20 °C hysteresis. When the die temperature exceeds this threshold, the pass FET turns off and FAULT is driven low. Recovery occurs automatically once temperature falls below 125 °C. This protection is independent of other fault conditions and is fully specified in the BQ24311DSGR Electrical Characteristics table (Section 7.5).
BQ24311DSGR 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:
- -
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
BQ24311DSGR FAQ
1.How can I place an order for BQ24311DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24311DSGR 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 BQ24311DSGR reliable?
The price and inventory of BQ24311DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24311DSGR is usually 5 days.
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Once your BQ24311DSGR 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 BQ24311DSGR?
For technical support, including BQ24311DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24311DSGR requirements.
6.How does Aetrix verify that BQ24311DSGR is sourced from the original manufacturer or authorized distributors?
All BQ24311DSGR 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 BQ24311DSGR meets industry standards.
7.What is the process for return or replacement of BQ24311DSGR?
All BQ24311DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ24311DSGR, 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 BQ24311DSGR part is unused and in its original packaging.
Return procedure for BQ24311DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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