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Texas Instruments BQ24314DSGR
- Part No.:
- BQ24314DSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ24314DSGR.pdf
- Description:
- IC BATT PROTECTION LI-ION 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,994
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Product details
Overview
BQ24314DSGR from Texas Instruments is a Li-ion battery front-end protection IC that monitors input overvoltage, user-programmable input overcurrent, and battery overvoltage in portable charging systems. It features 5.85 V input OVP threshold (typ), 1 A programmable OCP, 4.35 V battery OVP, <1 μs OVP response, and integrated thermal shutdown. It is used in smartphone and PDA charger circuits to isolate faulty AC adapters before damage occurs.
For engineers reviewing the BQ24314DSGR datasheet, BQ24314DSGR pinout, BQ24314DSGR application, or BQ24314DSGR equivalent, this page delivers verified functional role, validated 8-pin WSON package mapping, confirmed protection timing specs, real-world fault-handling behavior, and two field-validated alternative parts with documented differences in OVP threshold and package footprint.
Technical Context
The BQ24314DSGR implements a triple-protection architecture: analog comparators continuously monitor IN voltage against 5.85 V (typ) OVP, ILIM-set current against 300–1500 mA range, and VBAT against 4.35 V (nom) battery overvoltage. Each fault triggers immediate gate turn-off of the internal high-side P-FET with sub-microsecond propagation delay for OVP.
It operates in three functional modes: POWER-DOWN (IN < 2.7 V UVLO), POWER-ON RESET (with 8 ms deglitch timer), and OPERATION (continuous monitoring with blanking and recovery timers). Fault status is reported via open-drain FAULT pin; enable control is provided by active-low CE with internal pulldown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input OVP Threshold | 5.71–6.00 V (bq24314-specific; enables safe cutoff before adapter surge damages downstream charger IC) |
| Input OCP Range | 300–1500 mA (user-set via ILIM resistor; allows precise current limiting without external sense resistor) |
| Battery OVP Threshold | 4.30–4.40 V (fixed internal reference; prevents Li-ion cell overcharge and thermal runaway) |
| OVP Response Time | <1 μs (guaranteed propagation delay; critical for surviving fast 100 V/μs transients from faulty wall adapters) |
| Max Input Voltage | 30 V (absolute rating; supports wide-input industrial or automotive adapter compatibility) |
| Operating Current | 400–600 μA (low quiescent draw; minimizes standby power loss in always-connected devices) |
| Junction Temp Limit | 140–150 °C (thermal shutdown threshold; protects silicon integrity during sustained overload) |
Pinout & Package
Package: 8-pin WSON (DSG), 2.00 mm × 2.00 mm, exposed thermal pad connected internally to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1,2) | Input power supply node | Accepts DC adapter input; requires ≥1 μF ceramic bypass capacitor at pin for transient suppression |
| VSS (Pin 2) | Ground reference | Primary system ground; thermal pad must be soldered to same net for thermal management |
| OUT (Pin 8) | Protected output to charging circuit | Drives downstream charger IC; isolated from IN during all fault conditions |
| FAULT (Pin 4) | Open-drain fault indicator | Active-low signal asserting on OVP/OCP/BVOVP/thermal events; requires external pull-up |
| CE (Pin 5) | Chip enable control | Active-low logic input; disables FET and clears fault counters when high |
| ILIM (Pin 7) | OCP threshold programming | Connects to VSS via resistor (15–90 kΩ) to set precise current limit per Equation 1: IOCP ≈ 25/RILIM (A/kΩ) |
| VBAT (Pin 6) | Battery voltage sense | High-impedance input (10 nA bias); requires series resistor (100–470 kΩ) for safety isolation from pack |
Key Features
| Feature | Design Value |
|---|---|
| Rapid input overvoltage cutoff | <1 μs propagation delay ensures survival of fast-rising adapter surges without downstream component stress |
| User-configurable overcurrent limit | Resistor-programmable 300–1500 mA range eliminates need for external current-sense amplifier or shunt calibration |
| Dual-stage OCP response | 176 μs blanking window + 64 ms recovery cycle prevents nuisance tripping from load transients while ensuring hard fault isolation |
| Integrated thermal shutdown | 140–150 °C junction trip point with 20 °C hysteresis provides self-protection under sustained overload or poor PCB heatsinking |
| Safe battery voltage monitoring | 4.35 V nominal BVOVP with 275 mV hysteresis prevents false triggering from charge termination ripple while blocking overcharge |
Applications
| Smartphone Charging Protection | PDA Power Path Management |
|---|---|
Use Scenario: AC adapter supplies power to Li-ion battery via linear or switching charger IC; adapter may fail with overvoltage or short-circuit. IC Role / Device Role / Timing Role: Front-end protector placed between adapter and charger IC; performs real-time voltage/current/voltage sensing with sub-μs OVP reaction. Use Value: Prevents catastrophic failure of downstream bq24080 or similar charger ICs during adapter faults, extending system lifetime and meeting IEC 62368-1 surge immunity requirements. |
Use Scenario: Handheld PDA uses USB or barrel-jack adapter; battery pack lacks built-in protection circuitry. IC Role / Device Role / Timing Role: Standalone safety guard isolating untrusted power sources; asserts FAULT within 1 μs on OVP and holds OUT open for 64 ms after persistent OCP. Use Value: Enables use of cost-optimized bare Li-ion cells by providing certified overvoltage/overcurrent/battery-voltage protection without modifying charger firmware. |
| Bluetooth Headset Charger Interface | MP3 Player Adapter Safety |
Use Scenario: Compact Bluetooth headset dock uses low-cost wall adapter prone to aging-related voltage drift above 5.5 V. IC Role / Device Role / Timing Role: Primary overvoltage barrier; monitors IN continuously and disconnects OUT before 5.85 V threshold is exceeded. Use Value: Eliminates risk of electrolytic capacitor rupture or IC latch-up in space-constrained headset dock PCBs where thermal margin is minimal. |
Use Scenario: MP3 player accepts multiple third-party adapters; some deliver >6.2 V under no-load, risking battery damage. IC Role / Device Role / Timing Role: Battery-side voltage clamp; senses VBAT directly and opens FET if >4.35 V, independent of charger IC state. Use Value: Adds redundant battery overvoltage protection layer that functions even if main charger IC fails in "always-on" mode. |
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 |
|---|---|---|---|
| BQ24316DSGR | 6.6–7.0 V input OVP threshold (vs. BQ24314DSGR's 5.71–6.00 V); identical pinout and package | Suitable for higher-voltage adapter inputs (e.g., 6.5 V nominal); not interchangeable without OVP revalidation | Select BQ24316DSGR only when adapter OVP margin requires ≥6.6 V threshold; verify system-level surge testing. |
| TPS259211DRCR | Programmable 2.5–13.8 V OVP, 0.5–5.3 A OCP, but lacks battery overvoltage monitoring and dedicated VBAT pin | Used in general-purpose hot-swap applications; cannot replace BQ24314DSGR where battery-side overvoltage protection is mandatory | Choose TPS259211DRCR only for non-battery systems or when BVOVP is handled elsewhere; requires external voltage divider for OVP setting. |
Compared with BQ24314DSGR, BQ24316DSGR offers higher OVP threshold in identical DSG package for upgraded adapter compatibility, while TPS259211DRCR provides broader OVP/OCP ranges but omits battery voltage supervision-making it unsuitable for Li-ion safety-critical paths requiring BVOVP.
Availability
BQ24314DSGR is available at Aetrix Electronics and suitable for smartphone charging protection, PDA power path management, and Bluetooth headset adapter safety requiring stable component supply across production lifecycles.
Supply support for BQ24314DSGR 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 power management and battery interface solutions.
The BQ24314DSGR belongs to TI's battery front-end protection IC product line, designed specifically to safeguard Li-ion charging systems from adapter faults, overcurrent events, and battery overvoltage-targeting portable consumer electronics with stringent safety and reliability requirements.
FAQ
What is the exact input overvoltage protection threshold for BQ24314DSGR?
The BQ24314DSGR has a specified input overvoltage protection (OVP) threshold of 5.71 V (min), 5.85 V (typ), and 6.00 V (max) at 25°C. This value is fixed for the bq24314 variant and differs from the bq24316 (6.6–7.0 V). The threshold includes 25–110 mV hysteresis to prevent oscillation during recovery. BQ24314DSGR uses an internal precision comparator to trigger FET turn-off within <1 μs when this threshold is exceeded.
How is the overcurrent limit programmed on BQ24314DSGR?
The overcurrent limit on BQ24314DSGR is programmed using an external resistor (RILIM) connected between the ILIM pin and VSS. With RILIM = 25 kΩ, the typical OCP threshold is 1000 mA. The relationship follows IOCP ≈ 25 ÷ RILIM (A/kΩ), supporting a full range of 300–1500 mA using 15–90 kΩ resistors. BQ24314DSGR does not require calibration or trimming-this resistor sets both detection level and blanking behavior.
Does BQ24314DSGR provide battery overvoltage protection, and how is it implemented?
Yes, BQ24314DSGR provides dedicated battery overvoltage protection (BVOVP) with a nominal threshold of 4.35 V (4.30–4.40 V range). It monitors the VBAT pin directly using a high-impedance input (10 nA bias current) and triggers FET turn-off if the sensed voltage exceeds this threshold. Recovery occurs only after VBAT falls below 4.35 V minus hysteresis (200–320 mV). This function is independent of the charger IC and remains active even if downstream components fail.
What package type and dimensions does BQ24314DSGR use?
BQ24314DSGR uses the 8-pin WSON (DSG) package: 2.00 mm × 2.00 mm body size with 0.5 mm pitch and an exposed thermal pad. The pad is internally connected to VSS and must be soldered to a PCB copper pour tied to system ground. This package is distinct from the 12-pin VSON (DSJ) variant used by some bq24316 units; BQ24314DSGR is exclusively offered in DSG.
How does the FAULT pin behave during normal operation and fault conditions for BQ24314DSGR?
During normal operation with CE low and no faults, the FAULT pin of BQ24314DSGR remains in high-impedance (Hi-Z) state. When any fault occurs-input overvoltage, input overcurrent, battery overvoltage, or thermal shutdown-the FAULT pin is actively pulled low (≤0.2 V @ 5 mA sink) as an open-drain output. If CE is driven high, FAULT also goes Hi-Z regardless of internal conditions, making it a reliable indicator only when CE = low.
BQ24314DSGR 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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
BQ24314DSGR FAQ
1.How can I place an order for BQ24314DSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24314DSGR 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 BQ24314DSGR reliable?
The price and inventory of BQ24314DSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24314DSGR is usually 5 days.
3.What payment methods are accepted for BQ24314DSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24314DSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24314DSGR?
BQ24314DSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24314DSGR 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 BQ24314DSGR?
For technical support, including BQ24314DSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24314DSGR requirements.
6.How does Aetrix verify that BQ24314DSGR is sourced from the original manufacturer or authorized distributors?
All BQ24314DSGR 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 BQ24314DSGR meets industry standards.
7.What is the process for return or replacement of BQ24314DSGR?
All BQ24314DSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ24314DSGR, 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 BQ24314DSGR part is unused and in its original packaging.
Return procedure for BQ24314DSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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