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Texas Instruments BQ24312DSGT
- Part No.:
- BQ24312DSGT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
BQ24312DSGT.pdf
- Description:
- IC BATT PROTECTION LI-ION 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
BQ24312DSGT from Texas Instruments is a Li-ion battery front-end protection IC that provides integrated input overvoltage (5.85 V typ), user-programmable input overcurrent (300–1500 mA range), and battery overvoltage (4.35 V typ) protection in a single 2 × 2 mm WSON-8 package. It uses an internal N-channel FET to isolate faults, features thermal shutdown at 140°C, and delivers status via open-drain FAULT pin - deployed in mobile phones and Bluetooth headsets for charger circuit safety.
For engineers reviewing the BQ24312DSGT datasheet, BQ24312DSGT pinout, BQ24312DSGT application, or BQ24312DSGT equivalent, key selection criteria include programmable OCP threshold via ILIM resistor, 1.5-A continuous input current capability, robust false-trigger immunity during current transients, and compatibility with 3–30 V input sources in space-constrained portable designs.
Technical Context
The BQ24312DSGT implements three independent protection channels: input overvoltage detection with 64 µs blanking time and 8-ms recovery, input overcurrent limiting with 176 µs blanking and 64-ms fault recovery, and battery overvoltage cutoff with 176 µs deglitch timing. Each fault triggers FAULT pin assertion and increments dedicated counters.
Its functional architecture includes a charge-pump bias generator, bandgap reference, current-sense amplifier, OVP/OCP/BVOVP comparators, thermal sensor, and logic-controlled N-FET gate driver. The CE pin enables host-controlled power-down with automatic reset of OCP and Bat-OVP counters upon re-enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 30 V - supports wide-input adapters including 5 V USB and 12 V wall adapters without external regulation. |
| Max Input Current | 1.5 A - defines maximum safe forward current through internal pass FET under normal operation. |
| OVP Threshold | 5.85 V (typ) - clamps output when input exceeds safe level; 20–110 mV hysteresis prevents chatter during transient recovery. |
| Battery OVP | 4.35 V (typ) - disconnects charging path if Li+ cell voltage exceeds safe termination threshold. |
| OCP Programmability | 300–1500 mA via ILIM resistor (15–90 kΩ) - enables precise current-limit tuning for diverse load profiles. |
| Thermal Shutdown | 140°C (typ) - disables FET and asserts FAULT to prevent die damage during sustained overload or poor PCB thermal design. |
| Package | 8-pin WSON (2.0 × 2.0 mm, 0.5 mm pitch) - ultra-compact footprint with exposed thermal pad for enhanced power dissipation. |
Pinout & Package
Package: 8-pin WSON (DSG) with exposed thermal pad electrically connected to VSS; requires PCB thermal pad connection to ground plane for reliable thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power input | Accepts 3–30 V DC supply; requires ≥1 µF ceramic bypass capacitor to suppress cable-induced transients. |
| OUT | Protected output | Delivers regulated power to downstream charger IC; supports reverse current flow (accessory power mode) when VOUT > UVLO + 0.7 V. |
| VSS | Ground reference | Primary ground return; thermal pad must be soldered to same net for thermal management and electrical integrity. |
| VBAT | Battery voltage sense | Monitors Li+ pack voltage via external resistor divider; enables battery overvoltage cutoff at 4.35 V. |
| ILIM | OCP programming | Connects to VSS via resistor (15–90 kΩ) to set input overcurrent limit per IOCP = 25 ÷ RILIM (A/kΩ). |
| CE | Enable control | Active-low enable; internally pulled down - floating or grounded for always-on operation; high disables FET and clears fault counters. |
| FAULT | Fault status indicator | Open-drain active-low output signaling OVP, OCP, BVOVP, or thermal fault; requires external pull-up for host monitoring. |
| NC | No-connect | Internally unused; must remain unconnected per datasheet - no external routing or loading permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-fault protection | Simultaneous real-time monitoring of input voltage, input current, and battery voltage - eliminates need for discrete protection components. |
| User-programmable OCP | Adjustable 300–1500 mA trip point using single external resistor - enables optimization for different adapter capabilities and system loads. |
| Transient-immune blanking | 64 µs OVP and 176 µs OCP blanking windows - prevents false triggering from fast-rising input spikes while maintaining response to sustained faults. |
| Reverse current support | Enables OUT→IN power delivery (e.g., phone powering headset) up to 1.5 A without additional circuitry - extends system functionality in dual-role ports. |
| Integrated thermal protection | 140°C shutdown with 20°C hysteresis - safeguards against thermal runaway during high-current operation or inadequate heatsinking. |
Applications
| Mobile Phone Charging Protection | Bluetooth Headset Power Management |
|---|---|
Use Scenario: Protects Li-ion battery during USB/AC adapter charging in smartphones where faulty chargers may deliver excessive voltage or current. IC Role / Device Role / Timing Role: Front-end safety monitor placed between adapter and charger IC; responds within microseconds to OVP/OCP events. Use Value: Prevents thermal runaway and cell damage by isolating faulty input sources before downstream charger ICs can react. | Use Scenario: Enables compact wireless headset to accept power from host device (e.g., smartphone) while preventing overvoltage damage during accessory mode. IC Role / Device Role / Timing Role: Bidirectional protection element supporting both charging-in and accessory-power-out paths with shared connector. Use Value: Eliminates need for separate diode or switch in dual-path designs, reducing BOM count and PCB area in sub-20 mm² form factors. |
| MP3 Player Battery Safety | Low-Power Handheld Diagnostic Tool |
Use Scenario: Safeguards rechargeable Li-ion cells in portable audio players subjected to inconsistent third-party wall adapters. IC Role / Device Role / Timing Role: Standalone overvoltage/overcurrent guard upstream of linear charger; asserts FAULT to halt charging on violation. Use Value: Extends battery cycle life by blocking unsafe charging conditions that accelerate electrolyte decomposition and capacity loss. | Use Scenario: Used in field-service diagnostic tools requiring stable, protected power from variable USB hosts or battery packs. IC Role / Device Role / Timing Role: Input conditioning and fault isolation block ensuring clean, regulated supply to sensitive analog measurement circuits. Use Value: Maintains measurement accuracy by preventing supply rail collapse or noise injection during transient overloads or hot-plug events. |
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 |
|---|---|---|---|
| BQ24314DSGR | Same pinout and core protection functions; adds integrated 1.5-A load switch with controlled slew rate and higher OVP threshold (6.2 V). | Preferred where controlled turn-on sequencing or higher input voltage margin is required; not drop-in due to different OVP setting. | Select BQ24314DSGR when needing programmable soft-start or tolerance to 6.2-V adapter surges. |
| TPS259211DRCR | Single-channel eFuse with adjustable OCP (1–5 A), fixed 6.1-V OVP, no battery voltage monitoring or BVOVP function. | Lacks battery-side protection - suitable only for systems where battery monitoring occurs elsewhere (e.g., fuel gauge IC). | Choose TPS259211DRCR for pure input-side protection without battery sensing requirements. |
Compared with BQ24312DSGT, BQ24314DSGR offers enhanced surge handling but requires OVP recalibration, while TPS259211DRCR reduces feature set to focus on high-current input protection - making BQ24312DSGT optimal for cost-sensitive, battery-critical portable devices needing full triple-protection coverage.
Availability
BQ24312DSGT is available at Aetrix Electronics and suitable for mobile phones, Bluetooth headsets, and MP3 players requiring stable component supply across long-lifecycle consumer electronics programs.
Supply support for BQ24312DSGT 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The BQ24312DSGT belongs to TI's battery management portfolio, designed specifically to safeguard Li-ion cells in portable devices against charger-related failures - emphasizing reliability, small size, and multi-parameter fault detection.
FAQ
What protection functions does the BQ24312DSGT provide?
The BQ24312DSGT provides three independent protection functions: input overvoltage protection (OVP) with 5.85 V threshold, user-programmable input overcurrent protection (OCP) adjustable from 300 mA to 1500 mA via ILIM resistor, and battery overvoltage protection (BVOVP) at 4.35 V. It also includes thermal shutdown at 140°C and undervoltage lockout (UVLO) at 2.7 V. All protections trigger FAULT pin assertion and isolate the output via internal N-FET. This comprehensive coverage makes BQ24312DSGT ideal for safeguarding Li-ion batteries in portable electronics.
How is the overcurrent threshold set on the BQ24312DSGT?
The overcurrent threshold on the BQ24312DSGT is set by connecting a resistor (RILIM) between the ILIM pin and VSS. The relationship is approximated by IOCP = 25 ÷ RILIM (with current in amperes and resistance in kΩ). Valid RILIM values range from 15 kΩ to 90 kΩ, yielding OCP thresholds from 1500 mA down to 300 mA. For example, a 24.9 kΩ resistor sets IOCP ≈ 1000 mA. This resistor-based programming allows precise tailoring of current limits without firmware changes - a key advantage of the BQ24312DSGT in hardware-defined safety systems.
Can the BQ24312DSGT support reverse current flow for accessory power?
Yes, the BQ24312DSGT supports reverse current flow from OUT to IN when VOUT exceeds UVLO + 0.7 V, enabling use cases like a smartphone powering a Bluetooth headset through the same port. In this mode, the internal FET conducts bidirectionally up to 1.5 A, eliminating the need for external diodes. However, reverse-current overcurrent protection is not implemented - only forward-direction OCP applies. This capability is explicitly documented in the BQ24312DSGT datasheet Section 8.1.1 and confirms its suitability for dual-role USB or proprietary accessory interfaces.
What is the role of the FAULT pin on the BQ24312DSGT?
The FAULT pin on the BQ24312DSGT is an active-low open-drain output that signals any fault condition: input overvoltage, input overcurrent, battery overvoltage, or thermal shutdown. It remains high-impedance during normal operation or when CE is high. When asserted low, it drives an external pull-up resistor to indicate failure to the host processor. The BQ24312DSGT does not auto-recover after fault assertion - the host must cycle CE or remove/reapply input power to clear latched faults. This behavior ensures reliable fault reporting in safety-critical BQ24312DSGT deployments.
Does the BQ24312DSGT require external components for basic operation?
Yes, the BQ24312DSGT requires several external components for reliable operation: a ≥1 µF ceramic capacitor at IN, another ≥1 µF ceramic capacitor at OUT, a resistor from ILIM to VSS for OCP programming, and optionally a pull-up resistor on FAULT and series resistor on CE for host interfacing. The VBAT pin must connect to the battery through a 100–470 kΩ resistor for safe overvoltage sensing. These components are mandatory per the BQ24312DSGT datasheet Figure 12 and ensure proper transient suppression, current limiting, fault reporting, and battery protection - omitting any compromises BQ24312DSGT functionality.
BQ24312DSGT 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)
BQ24312DSGT FAQ
1.How can I place an order for BQ24312DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24312DSGT 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 BQ24312DSGT reliable?
The price and inventory of BQ24312DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24312DSGT is usually 5 days.
3.What payment methods are accepted for BQ24312DSGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24312DSGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24312DSGT?
BQ24312DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24312DSGT 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 BQ24312DSGT?
For technical support, including BQ24312DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24312DSGT requirements.
6.How does Aetrix verify that BQ24312DSGT is sourced from the original manufacturer or authorized distributors?
All BQ24312DSGT 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 BQ24312DSGT meets industry standards.
7.What is the process for return or replacement of BQ24312DSGT?
All BQ24312DSGT units undergo pre-shipment inspection (PSI). If there is an issue with BQ24312DSGT, 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 BQ24312DSGT part is unused and in its original packaging.
Return procedure for BQ24312DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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