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Texas Instruments BQ24314ADSGR
- Part No.:
- BQ24314ADSGR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ24314ADSGR.pdf
- Description:
- IC BATT PROTECTION LI-ION 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,625
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Product details
Overview
BQ24314ADSGR from Texas Instruments is a Li-ion battery front-end protection IC that provides input overvoltage (OVP), user-programmable input overcurrent (OCP), and battery overvoltage (BVOVP) protection in a single 8-pin WSON package. It features 5.85 V typical OVP threshold, 1.0 A typical OCP threshold (set via external resistor), 4.35 V BVOVP threshold, <1 µs OVP response time, and thermal shutdown at 140°C. It is used in smartphone charging paths to isolate faulty adapters before damage occurs.
For engineers reviewing the BQ24314ADSGR datasheet, BQ24314ADSGR pinout, BQ24314ADSGR application, or BQ24314ADSGR equivalent, key selection considerations include its 30 V absolute max input rating, 1.5-A continuous current capability, active-low open-drain FAULT output for host fault reporting, CE-controlled enable/disable functionality, and programmable OCP with blanking and recovery timing.
Technical Context
The BQ24314ADSGR integrates a high-side N-channel pass FET (Q1) with internal gate drive, enabling bidirectional current flow under specific conditions-forward (IN→OUT) with full OCP, reverse (OUT→IN) for accessory power without OCP. Its protection logic uses independent comparators for VIN, IIN (via ILIM resistor), and VBAT, each triggering FAULT assertion and Q1 turn-off upon violation.
It implements deglitch timers (8 ms for PGOOD, 176 µs for BVOVP), blanking periods (176 µs for OCP), and recovery delays (64 ms after OCP, 8 ms after OVP). Internal counters track repeated faults-15 consecutive OCP or BVOVP events cause permanent latch-off until power cycle or CE toggle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 5.85 V typical; disconnects IN from OUT within <1 µs if input exceeds safe adapter voltage. |
| OCP Threshold Range | 300–1500 mA; set by external RILIM (15–90 kΩ); enables precise current limiting for diverse adapter profiles. |
| BVOVP Threshold | 4.35 V nominal; protects Li-ion cells from overcharge by cutting off charge path when pack voltage exceeds safe limit. |
| Max Input Voltage | 30 V absolute maximum; supports wide-input USB PD, wall adapters, and automotive USB up to 24 V systems. |
| Continuous Current | 1.5 A rated; sustains full charging current while maintaining thermal safety up to 125°C junction temperature. |
| Thermal Shutdown | 140°C trigger; disables FET and asserts FAULT to prevent die damage during sustained overload or poor PCB heatsinking. |
| Enable Logic | Active-low CE pin with internal pulldown; allows host processor control and resets OCP/BVOVP fault counters on re-enable. |
| FAULT Output | Open-drain, active-low; signals OVP, OCP, BVOVP, or thermal fault to host MCU without external level-shifting. |
Pinout & Package
Package: 8-pin WSON (DSG), 2.00 mm × 2.00 mm body with exposed thermal pad connected internally to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input power supply terminal | Accepts DC adapter input up to 30 V; requires ≥1 µF ceramic bypass capacitor to VSS for transient suppression. |
| VSS (Pin 2) | Ground reference | Primary ground connection; thermal pad must be soldered to matching PCB copper area for thermal performance. |
| NC (Pin 3) | No-connect | Internally unused; must remain unconnected per datasheet-no external routing or pull-up/down. |
| FAULT (Pin 4) | Fault status indicator | Open-drain output pulled low during any fault condition; requires external pull-up for host GPIO monitoring. |
| CE (Pin 5) | Chip enable control | Active-low enable; high state forces FET OFF and disables FAULT output; internal pulldown allows default-on operation. |
| VBAT (Pin 6) | Battery voltage sense | High-impedance input (10 nA bias) for BVOVP detection; must connect through RBAT (100–470 kΩ) for safety isolation. |
| ILIM (Pin 7) | OCP programming node | Connects to VSS via resistor to set OCP threshold per IOCP = 25 / RILIM (kΩ); defines current limit accuracy and response. |
| OUT (Pin 8) | Protected output to charger | Delivers regulated input to downstream charging IC (e.g., bq24080); requires ≥1 µF ceramic capacitor to VSS. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid OVP Response | Turns off internal FET in <1 µs to prevent downstream component damage from adapter surges. |
| User-Programmable OCP | Adjustable 300–1500 mA limit via single external resistor-enables one BOM for multiple adapter types. |
| Triple-Fault Protection | Simultaneous monitoring of input voltage, input current, and battery voltage-no external comparators needed. |
| Reverse-Current Support | Enables OUT→IN power delivery (e.g., phone powering headset) when VOUT > UVLO + 0.7 V, using same FET path. |
| Fault Event Counting | Tracks 15 consecutive OCP or BVOVP events before latching off-prevents nuisance tripping while ensuring safety. |
| Integrated Thermal Protection | Monitors die temperature and disables FET at 140°C with 20°C hysteresis-eliminates need for discrete thermal sensor. |
Applications
| Smartphone Charging Path | Bluetooth Headset Power Delivery |
|---|---|
Use Scenario: Smartphone uses AC adapter for Li-ion charging; adapter fails with overvoltage spike. IC Role / Device Role / Timing Role: Front-end protector placed between adapter jack and main charger IC (e.g., bq24080); responds in <1 µs to isolate battery. Use Value: Prevents catastrophic cell venting or fire by cutting power before downstream charger IC can react. | Use Scenario: Smartphone powers Bluetooth headset via shared USB port while charging. IC Role / Device Role / Timing Role: Enables reverse current flow (OUT→IN) when headset draws power; maintains forward protection integrity. Use Value: Eliminates need for separate power switch or diode-reduces BOM count and forward voltage drop. |
| MP3 Player Adapter Safety | PDA Battery Overvoltage Guard |
Use Scenario: Portable MP3 player accepts third-party chargers with inconsistent voltage regulation. IC Role / Device Role / Timing Role: Monitors adapter input continuously; asserts FAULT and disables FET on first OVP/OCP event. Use Value: Blocks unregulated 9–12 V adapters from reaching 4.2 V Li-ion cell-avoids electrolyte decomposition. | Use Scenario: PDA battery pack experiences cell imbalance causing one cell to overvolt during charge. IC Role / Device Role / Timing Role: Senses VBAT via high-impedance input; triggers disconnection at 4.35 V ±50 mV. Use Value: Stops charging before cell reaches 4.4 V-preserves cycle life and prevents thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery front-end protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24315DSCR | Same functional block diagram and pinout; differs only in production lot marking and minor ESD spec revision (CDM ±500 V vs ±250 V). | No functional impact; identical use cases and layout compatibility. | Select BQ24315DSCR only if TI's latest production release is required for long-term supply continuity. |
| TPS259211DSGR | Single-channel eFuse with 5.7 V fixed OVP, non-programmable 1.5 A OCP, no BVOVP sensing, and no VBAT pin. | Lacks battery-side monitoring-requires external circuitry for BVOVP; suitable only where battery protection is handled upstream. | Choose TPS259211DSGR when system-level BVOVP is managed elsewhere and programmability is not needed. |
Compared with BQ24314ADSGR, BQ24315DSCR offers identical protection functionality with updated manufacturing specs, while TPS259211DSGR trades BVOVP integration for higher precision current limiting and faster OVP response-but requires external BVOVP implementation.
Availability
BQ24314ADSGR is available at Aetrix Electronics and suitable for smartphone charging paths, Bluetooth headset power delivery, MP3 player adapter safety, and PDA battery overvoltage guard applications requiring stable component supply across industrial and consumer electronics programs.
Supply support for BQ24314ADSGR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The BQ24314ADSGR belongs to TI's battery management IC portfolio, designed specifically to safeguard Li-ion cells in space-constrained portable devices against adapter faults, overcurrent, and overcharge-prioritizing ultra-fast response and minimal external components.
FAQ
What protection functions does the BQ24314ADSGR provide?
The BQ24314ADSGR provides three independent protection functions: input overvoltage (OVP) with <1 µs response, user-programmable input overcurrent (OCP) via external resistor, and battery overvoltage (BVOVP) at 4.35 V. It also includes thermal shutdown at 140°C and undervoltage lockout (UVLO) at 2.7 V. All faults assert the open-drain FAULT pin and disable the internal pass FET to isolate the battery.
How is the overcurrent threshold set on the BQ24314ADSGR?
The overcurrent threshold on the BQ24314ADSGR is set by connecting an external resistor (RILIM) between the ILIM pin and VSS. The relationship is IOCP ≈ 25 / RILIM (with current in amperes and resistance in kΩ). For example, a 24.9 kΩ resistor sets IOCP to approximately 1.0 A. RILIM must be between 15 kΩ and 90 kΩ to ensure valid operation across temperature and process variation.
Can the BQ24314ADSGR support reverse current flow-for example, when a phone powers a headset?
Yes, the BQ24314ADSGR supports reverse current flow (OUT → IN) when VOUT exceeds UVLO + 0.7 V, enabling accessory power delivery through the same connector. In this mode, the internal FET conducts bidirectionally, but overcurrent protection is disabled in reverse direction. Forward OVP, BVOVP, and thermal protection remain fully active.
What is the role of the VBAT pin on the BQ24314ADSGR, and how should it be connected?
The VBAT pin on the BQ24314ADSGR senses battery voltage for BVOVP detection. It must be connected to the battery pack's positive terminal through an external resistor (RBAT), recommended between 100 kΩ and 470 kΩ. This isolates the battery from potential 30 V IN faults, limiting fault current to <250 µA while keeping BVOVP measurement error below 1 mV.
Does the BQ24314ADSGR require external capacitors, and what values are recommended?
Yes, the BQ24314ADSGR requires two external ceramic capacitors: a minimum 1 µF capacitor between IN and VSS, and another minimum 1 µF capacitor between OUT and VSS. Both must be placed close to their respective pins. These capacitors suppress input transients, improve OVP response, and serve as local energy storage for downstream charging circuits.
BQ24314ADSGR 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)
BQ24314ADSGR FAQ
1.How can I place an order for BQ24314ADSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24314ADSGR 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 BQ24314ADSGR reliable?
The price and inventory of BQ24314ADSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24314ADSGR is usually 5 days.
3.What payment methods are accepted for BQ24314ADSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24314ADSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24314ADSGR?
BQ24314ADSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24314ADSGR 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 BQ24314ADSGR?
For technical support, including BQ24314ADSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24314ADSGR requirements.
6.How does Aetrix verify that BQ24314ADSGR is sourced from the original manufacturer or authorized distributors?
All BQ24314ADSGR 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 BQ24314ADSGR meets industry standards.
7.What is the process for return or replacement of BQ24314ADSGR?
All BQ24314ADSGR units undergo pre-shipment inspection (PSI). If there is an issue with BQ24314ADSGR, 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 BQ24314ADSGR part is unused and in its original packaging.
Return procedure for BQ24314ADSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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